OBC VOLUME 2 · APPENDIX A · NOTES TO PART 1Updated for the 2024 Ontario Building Code
Appendix A — Explanatory Notes to Part 1
Appendix A explanatory notes for Part 1 of Division B of the 2024 Ontario Building Code. These notes are advisory: they explain the intent behind code provisions and how to apply them.
A-1.1.1.1.(2)Factory-Constructed Buildings.
The Building Code applies the same requirements to site-built and factory-constructed buildings. However, it can often be
difficult to determine whether a factory-constructed building complies with the Code once it has been delivered to the
construction site because many of the wall, roof and floor assemblies are closed in and so their components cannot be
inspected. CSA A277, “Procedure for certification of prefabricated buildings, modules, and panels,” was developed to
address this problem with regard to residential, commercial and industrial buildings. This standard describes a procedure
whereby an independent certification agency can review the quality control procedures of a factory and make periodic
unannounced inspections of its products. The standard is not a building code, only a procedure for certifying compliance of
factory-constructed components with a building code or other standard. If a factory-constructed building bears the label of an
accredited certification agency indicating that compliance with the Building Code has been certified using the CSA A277
procedure, the accepting authority will have some assurance that the concealed components do not require re-inspection on
site.
On the other hand, standards in the CSA Z240 MH Series, “Manufactured homes,” do resemble a building code. Most of the
individual standards in the series contain requirements regarding many issues also covered in the Building Code. Some of
these Z240 MH Series provisions are performance requirements with no quantitative criteria, some simply reference the
applicable Building Code requirements, while others contain requirements that differ from those in the Building Code.
Because it would be illogical to have two different sets of requirements for buildings—one set that applies to site-built
buildings and one set that applies to factory-constructed buildings—the Building Code does not reference these Z240 MH
Series standards. One of the individual standards in the Z240 MH Series deals with special requirements for manufactured
homes related to the fact that these houses must be moved over roads, which is an issue the Building Code does not address.
Therefore, labeling that indicates that a factory-constructed house complies with the Z240 MH Series standards cannot be
taken as an indication that the house necessarily complies with the building code in effect for the location where the house
will be sited.
The Building Code does reference CSA Z240.10.1, “Site preparation, foundation, and installation of buildings,” which is not
actually part of the CSA Z240 MH Series. This standard contains requirements for surface foundations where buildings—not
just houses—comply with the deformation resistance test provided in CSA Z240.2.1, “Structural requirements for
manufactured homes.”
A-1.2.1.1.(1)(a)Compliance Via Acceptable Solutions.
If a building design (e.g. material, component, assembly or system) can be shown to meet all provisions of the applicable
acceptable solutions in Division B (e.g. it complies with the applicable provisions of a referenced standard), it is deemed to
have satisfied the objectives and functional statements linked to those provisions and thus to have complied with that part of
the Code. In fact, if it can be determined that a design meets all the applicable acceptable solutions in Division B, there is no
need to consult the objectives and functional statements in Division A to determine its compliance.
A-1.2.1.1.(1)(b)Compliance Via Alternative Solutions.
Where a design differs from the acceptable solutions in Division B, then it should be treated as an “alternative solution”. A
proponent of an alternative solution must demonstrate that the alternative solution addresses the same issues as the applicable
acceptable solutions in Division B and their attributed objectives and functional statements. However, because the objectives
and functional statements are entirely qualitative, demonstrating compliance with them in isolation is not possible.
Appendix A • Volume 2 Page 1
Therefore, Clause 1.2.1.1.(1)(b) identifies the principle that Division B establishes the quantitative performance targets that
alternative solutions must meet. In many cases, these targets are not defined very precisely by the acceptable solutions -
certainly far less precisely than would be the case with a true performance code, which would have quantitative performance
targets and prescribed methods of performance measurement for all aspects of building performance. Nevertheless,
Clause 1.2.1.1.(1)(b) makes it clear that an effort must be made to demonstrate that an alternative solution will perform as
well as a design that would satisfy the applicable acceptable solutions in Division B - not “well enough” but “as well as”. In
this sense, it is Division B that defines the boundaries between acceptable risks and the “unacceptable” risks referred to in the
statements of the Code’s objectives, i.e. the risk remaining once the applicable acceptable solutions in Division B have been
implemented represents the residual level of risk deemed to be acceptable by the broad base of Canadians who have taken
part in the consensus process used to develop the Code.
Level of Performance
Where Division B offers a choice between several possible designs, it is likely that these designs may not all provide
exactly the same level of performance. Among a number of possible designs satisfying acceptable solutions in Division B,
the design providing the lowest level of performance should generally be considered to establish the minimum acceptable
level of performance to be used in evaluating alternative solutions for compliance with the Code.
Sometimes a single design will be used as an alternative solution to several sets of acceptable solutions in Division B. In
this case, the level of performance required of the alternative solution should be at least equivalent to the overall level of
performance established by all the applicable sets of acceptable solutions taken as a whole.
Each provision in Division B has been analyzed to determine to what it applies and what it is intended to achieve. The
resultant application and intent statements clarify what undesirable results each provision seeks to preclude. These
statements are not a legal component of the Code, but are advisory in nature, and can help Code users establish
performance targets for alternative solutions.
Areas of Performance
A subset of the acceptable solutions in Division B may establish criteria for particular types of designs (e.g. certain types
of materials, components, assemblies, or systems). Often such subsets of acceptable solutions are all attributed to the
same objective: Fire Safety, for example. In some cases, the designs that are normally used to satisfy this subset of
acceptable solutions might also provide some benefits that could be related to some other objective: Fire Protection of
the Building, for example. However, if none of the applicable acceptable solutions are linked to Objective OP1, Fire
Protection of the Building, then alternative solutions proposed to replace these acceptable solutions are not required to
provide a similar benefit related to Fire Protection of the Building. In other words, the acceptable solutions in
Division B establish acceptable levels of performance for compliance with Division B only in those areas defined by the
objectives and functional statements attributed to the acceptable solutions.
Applicable Acceptable Solutions
In demonstrating that an alternative solution will perform as well as a design that would satisfy the applicable acceptable
solutions in Division B, its evaluation should not be limited to comparison with the acceptable solutions to which an
alternative is proposed. It is possible that acceptable solutions elsewhere in the Code also apply. The proposed
alternative solution may be shown to perform as well as the most apparent acceptable solution which it is replacing but
may not perform as well as other relevant acceptable solutions. For example, an innovative sheathing material may
perform adequately as sheathing in a wall system that is braced by other means but may not perform adequately as
sheathing in a wall system where the sheathing must provide the structural bracing. All applicable acceptable solutions
should be taken into consideration in demonstrating the compliance of an alternative solution.
Relationship Between Division A and Division B
Supplementary Standard SA-1 sets out the objectives and functional statements which have been attributed to the
acceptable solutions provided in Division B of the Building Code.
Page 2 Appendix A • Volume 2
“Acceptable solution” is defined in Article 1.4.1.2. of Division A. Objectives and functional statements have accordingly
been attributed to each provision of Parts 2 to 12 of Division B that is considered to be a “requirement”; that is, a
provision that provides criteria necessary to determine compliance with Division B. Requirements may specify
performance values, qualities, quantities, design methods and test methods that are required in order to comply with
Division B.
Objectives and functional statements have not been attributed to provisions of Division B which are not considered to be
“requirements”, but rather assist in the interpretation of requirements by fulfilling the following functions:
• Introductions: specifies the scope and/or application of requirements (for example, Sentence 5.1.2.1.(1) of Division
B, which specifies that application of Part 5);
• Application modifiers: expand or limit the application of a requirement without changing its intent (for example,
Sentence 9.35.2.1.(1) of Division B, which expands the application of the requirements for garages to a carport
with more than 60% of its perimeter enclosed);
• Exemptions: waive the application of a requirement (for example, Sentence 6.3.1.3.(6) of Division B, which
exempts open-air storeys in a storage garage from the mechanical exhaust requirements of the remainder of
Article 6.3.1.3.);
• Signpost: provides direction to another requirement which would in any event be applicable (for example,
Sentence 3.13.5.1. of Division B, which directs the Code user to the requirements of Subsection 3.2.4. for fire
alarm and detection systems in rapid transit stations);
• Classifications: categorize and sort requirements or aspects of requirements (for example, Sentence 8.1.2.1.(1) of
Division B, which classifies the types of sewage systems)
• Clarifications: explain the intent of a requirement (for example, Sentence 5.2.2.1.(2) of Division B, which
identifies the structural loads referenced in the remainder of Article 5.2.2.1.);
• Definitions: defining terms used in a requirement (for example, Sentence 7.1.1A.1.(2) of Division B, which defines
“storey” for the purpose of Part 7);
• Administrative provisions: specifies the use of, and determination of compliance with, requirements (for example,
Sentence 9.7.4.3.(4) of Division B, which requires labelling of exterior wood doors to facilitate enforcement of the
requirements of the remainder of Article 9.7.4.3.);
Requirements of Division B will often be dependent on other provisions of Division B to which objectives and functional
statements have not been attributed.
For example, Sentence 3.2.4.1.(4) of Division B lists the conditions when a fire alarm system is required. Objective OS1.5
and functional statement F11 are attributed to this requirement. However, this Sentence must also be examined in the
context of Sentences 3.2.4.1.(4.1) and (5), which are not characterized as requirements (and therefore have not been
attributed objectives or functional statements) but are necessary to explain the context of that Sentence. In this instance,
Sentences (4.1) and (5) list exceptions and modifications to Sentence (4).
As a result, in evaluating the level of performance of an acceptable solution for the purposes of assessing an alternative
solution, regard must be had both to requirements (to which objectives and functional statements have been attributed in
this Standard) and to other provisions (to which objectives and functional statements have not been attributed in this
Standard) related to the requirement.
A-1.3.3.Application of Division B.
The provisions in this Code are intended to establish minimum acceptable standards for public health and public safety, fire
protection, structural sufficiency, conservation, environmental integrity, barrier-free use and access. It is intended that all
installed features of a building, whether required or not, would be designed in conformance with good engineering practice
and would meet the applicable requirements of the Code. Good design is necessary to ensure that the level of public safety
Appendix A • Volume 2 Page 3
established by the Building Code requirements would not be reduced by a voluntary installation. Voluntary installations
should not detrimentally affect other applicable provisions required by the Code.
There is a public expectation that installed features in a building would meet their intended function and conform to the
Building Code.
A-1.3.3.3C.Existing Buildings.
This Article describes the extent of renovation subject to the Building Code: only the areas or portions of a building being
renovated, or other parts of a building adversely affected by that renovation need comply with the requirements of the Code;
all other areas or portions need not comply with the Code and may remain unchanged.
A-1.3.3.4.(2)Buildings Divided by Firewalls.
This concept relates to the provisions directly regulated by this Code and does not apply to electrical service entrance and
natural gas service requirements which are regulated by other documents.
A-1.4.1.2.(1)Defined Terms.
Adaptable Seating
Adaptable seating enables persons in wheelchairs to transfer to a fixed seat without the obstruction of an armrest.
Exit
Exits include doors or doorways leading directly into an exit stair or directly to the outside. In the case of an exit leading
to a separate building, exits also include vestibules, walkways, bridges and balconies.
Farm Building
Farm buildings as defined in Article 1.4.1.2. include but are not limited to produce storage and packing facilities, livestock
and poultry housing, milking centres, manure storage facilities, grain bins, silos, feed preparation centres, farm workshops,
greenhouses, farm retail centres, and horse riding, exercise and training facilities. Farm buildings may be classed as low or
high human occupancy depending on the occupant load.
Examples of farm buildings likely to be classed as low human occupancy as defined in Article 1.2.1.2. of the National
Farm Building Code of Canada are livestock and poultry housing, manure and machinery storage facilities and horse
exercise and training facilities where no bleachers or viewing area are provided.
Examples of other buildings that would be classed as other than low human occupancy include farm retail centres for
feeds, horticultural and livestock produce, auction barns and show areas where bleachers or other public facilities are
provided. Farm work centres where the number of workers frequently exceeds the limit for low human occupancy will
also be in this category.
It is possible to have areas of both high and low human occupancy in the same building provided that the structural safety
and fire separation requirements for high human occupancy are met in the part thus designated.
Fire Separation
A fire separation may or may not have a fire-resistance rating.
Heritage Building
This definition facilitates acknowledgement and acceptance of the significance of such a building through creditable
means.
Page 4 Appendix A • Volume 2
Plumbing System
“Plumbing” is defined in the Building Code Act, 1992. Each of the three systems (drainage, venting, water) appearing in
the definition are further defined in Article 1.4.1.2., with the end result that a plumbing system encompasses all three
elements.
Other piping systems as listed below are excluded from plumbing system since the definition of water system limits the
system to the point of juncture with outlets, fixtures, etc. Similarly, a drainage system starts at the fixture or plumbing
appliance it drains.
A plumbing system does not include,
(a) a system of piping,
(i) for space heating in which water is used as a medium to transfer heat,
(ii) in which liquids or vapours are circulated for the purpose of cooling or refrigeration,
(iii) through which air is passed for the purpose of controlling the temperature, humidity or motion of air passing
through the system,
(iv) that conveys water for the purpose of providing water or nutrients to the soil,
(v) that conveys water for the purpose of landscaping or for the care of animals, birds or fish,
(vi) that transmits force by means of water or by means of a liquid other than water in which water is used for
cooling,
(vii) that conveys liquids for the purpose of melting ice or snow, or
(viii) that uses water in the conveyance of flammable gas or fuel; or
(b) a well, a well pump installed for the purpose of conveying water from a well, a pressure tank and pump if the tank and
pump are combined as a unit, the piping between any well pump and the well, the piping between a well pump and a
pressure tank that is installed separate from the pump and the connection of the piping to such pressure tank, and when
there is no well pump, any piping connected to the well for a distance of three feet from the outside of the well.
Public Corridor
A covered mall is considered to be a public corridor and, as such, is subject to the same requirements as a public corridor.
Public Heritage Building
This definition addresses smaller heritage buildings that are to be made available to the public for viewing as examples of
an architectural period or periods in the past, depicting how our forebears lived, worked or played, and what artifacts,
objects or clothing were in use at that time. These buildings are not considered museums as such, and therefore would not
be subject to the more stringent requirements of assembly occupancies for that use.
Service Room
Typical examples of service rooms include boiler rooms, furnace rooms, incinerator rooms, garbage handling rooms, and
rooms to accommodate air-conditioning or heating appliances, pumps, compressors and electrical equipment. Rooms such
as elevator machine rooms and common laundry rooms are not considered as service rooms.
Suite
Tenancy in the context of the term “suite” applies to both rental and ownership tenure. In a condominium arrangement, for
example, dwelling units are considered separate suites even though they are individually owned. In order to be of
complementary use, a series of rooms that constitute a suite are in reasonably close proximity to each other and have
access to each other either directly by means of a common doorway or indirectly by a corridor, vestibule or other similar
arrangement.
Appendix A • Volume 2 Page 5
The term “suite” does not apply to rooms such as service rooms, common laundry rooms and common recreational rooms
that are not leased or under a separate tenure in the context of the Code. Similarly, the term suite is not normally applied
in the context of buildings such as schools and hospitals, since the entire building is under a single tenure. A rented room
in a long-term care home could be considered as a suite if the room was under a separate tenure. A hospital bedroom on
the other hand is not considered to be under a separate tenure, since the patient has little control of that space, even though
he pays the hospital a per diem rate for the privilege of using the hospital facilities, which include the sleeping areas.
For certain requirements in the Code, the expression “room or suite” is used (e.g. travel distance). This means that the
requirement applies within the rooms of suites as well as to the suite itself and to rooms that may be located outside the
suite. In other places the expression “suite, and rooms not located within a suite” is used (e.g. for the installation of smoke
and heat detectors). This means that the requirement applies to individual suites as defined, but not to each room within
the suite. The rooms “not within a suite” would include common laundry rooms, common recreational rooms and service
rooms, that are not considered as tenant occupied space.
a1 Secondary Suite
A secondary suite is a self-contained dwelling unit that is part of a building containing not more than two dwelling units
(including the secondary suite) and any common spaces such as common storage, common service rooms, common
laundry facilities or common areas used for egress.
Secondary suites are typically created within a new or existing single dwelling unit—commonly called a “house”—either
constructed as an addition to an existing house or incorporated during the construction of a new house. A secondary suite
may have more than one storey and may be on the same level as the otherl dwelling unit of the house or be above or below
it.
Examples of buildings where secondary suites are permitted include individual detached houses, or where the secondary
suite is located in a portion of a building, semi-detached houses (half of a double) and freehold row houses.
Where a building has multiple occupancies, the secondary suite can only be created in a portion of the building that is of
residential occupancy. Apartment buildings have more than two dwelling units and are therefore not permitted to have
secondary suites.
Neither dwelling unit in a house can be strata-titled or otherwise subdivided from the remainder of the house under
provincial or territorial legislation. This means that both dwelling units are registered under the same title.
Secondary suites are also referred to as “accessory suites” or “secondary units”.
e1 A-1.4.1.3. Applicable Law.
Applicants for building permits are required to establish compliance with applicable law. The following table lists contact
information for those agencies responsible for the statutory provisions defined in Sentence 1.4.1.3.(1):
Applicable Law Provision Responsible Agency Contact
City of Toronto Act, 2006:
Subsection 102(3) of the City of Toronto Act, 2006
By-laws made under section 108 of the City of Toronto
Act, 2006 but only with respect to the issuance of a General Inquiry:
City of Toronto
permit for the construction of a green roof. ph: 311 or 416-392-2489
Section 114 of the City of Toronto Act, 2006, with respect
to the approval by the City of Toronto or the Ontario Land
Tribunal of plans and drawings.
Page 6 Appendix A • Volume 2
Applicable Law Provision Responsible Agency Contact
Clean Water Act, 2006:
Clause 59(1)(b) of the Clean Water Act, 2006 with Ministry of the Environment, General Inquiry:
respect to the issuance of a notice by the risk Conservation and Parks ph: 416-325-4000 or 800-565-4923
management official for the construction of a building.
Conservation Authorities Act:
Clause 28(1)(c) under the Conservation Authorities Act,
with respect to the permission of the authority for the Local Conservation Authority
construction of a building if the control of flooding,
erosion, dynamic beaches or pollution may be affected
by the development.
General Inquiry:
ph: 416-212-7432
Central East Regional Office
ph: 905-868-8900
Central West Regional Office
ph: 905-567-7177 or 877-832-2818
Child Care and Early Years Act, 2014: Eastern Regional Office
ph: 613-234-1188 or 800-267-5111
Section 14 of Regulation 137/15, under the Child Care Hamilton/Niagara Regional Office
and Early Years Act, 2014, with respect to the approval Ministry of Children,
ph: 905-521-7280
of plans for a new building to be erected or an existing Community and Social
North East Regional Office
building to be used, altered or renovated for use as a Services
ph: 705-474-3540 or 800-461-6977
child care centre or for alterations or renovations to be Northern Regional Office
made to premises used by a child care centre. ph: 705-564-6699 or 800-265-1222
South East Regional Office
ph: 613-545-0539 or 800-646-3209
South West Regional Office
ph: 519-438-5111 or 800-265-4197
Toronto Regional Office
ph: 416-325-0500
Development Charges Act, 1997:
Sections 28 and 53 under the Development Charges Act, Local Municipality
1997.
Education Act:
General Inquiry
Education Act, Section 194, with respect to the approval Ministry of Education ph: 416-325-2929 or 800-387-5514
of the Minister for the demolition of a building.
Education Act:
Local Municipality
Sections 257.83 and 257.93 under the Education Act.
Elderly Persons Centres Act:
Section 6 of Regulation 314, of the Elderly Persons Ministry of Health and General Inquiry:
Centres Act, with respect to the approval of the Minister Long-Term Care ph: 416-327-4327 or 800-268-1153
for the construction of a building project.
Appendix A • Volume 2 Page 7
Applicable Law Provision Responsible Agency Contact
Environmental Assessment Act:
Section 5 of the Environmental Assessment Act, with General Inquiry:
Ministry of the Environment, ph: 416-325-4000 or 800-565-4923
respect to the approval of the Ministry or the Ontario Environmental Approvals Branch
Conservation and Parks
Land Tribunal to proceed with an undertaking. ph: 416-314-8001 or 800-461-6290
Subsection 5(4) of the Environmental Assessment Act
Environmental Protection Act:
Section 46 of the Environmental Protection Act with
respect to the approval of the Minister to use land or land General Inquiry:
covered by water that has been used for the disposal of ph: 416-325-4000 or 800-565-4923
waste. Central Region
ph: 416-326-6700 or 800-810-8048
Section 47.3 of the Environmental Protection Act, with Eastern Region
respect to the issuance of a renewable energy approval. Ministry of the Environment, ph: 613-549-4000 or 800-267-0974
Northern Region
Section 168.3.1 of the Environmental Protection Act, with Conservation and Parks
ph: 807-475-1205 or 800-875-7772
respect to the construction of a building to be used in Southwestern Region
connection with a change of use of a property. ph: 519-873-5000 or 800-265-7672
Paragraph 2 of Subsection 168.6(1) of the Environmental West Central Region
Protection Act, if a certificate of property use has been ph: 905-521-7640 or 800-668-4557
issued in respect of the property under subsection
168.6(1) of the Act.
Milk Act
Section 14 of the Milk Act, with respect to the permit from Ministry of Agriculture, Food General Inquiry
the Director for the construction or alteration of any and Rural Affairs ph: 519-826-3100 or 888-466-2372
building intended for use as a plant.
Municipal Act, 2001
Local Municipality
Subsection 133(4) of the Municipal Act, 2001.
Niagara Escarpment Planning and Development Act: General Inquiry
Ministry of Natural Resources ph: 800-667-1940
Subsection 24(3) of the Niagara Escarpment Planning and Forestry Niagara Escarpment Commission
and Development Act. ph: 905-877-5191
Nutrient Management Act, 2002:
Section 11.1 of O. Reg. 267/03 of the Nutrient
Management Act, 2002, with respect to a proposed General Inquiry
Ministry of Agriculture, Food ph: 519-826-3100 or 888-466-2372
building or structure to house farm animals or store and Rural Affairs
nutrients if that Regulation requires the preparation and
approval of a nutrient management strategy before
construction of the proposed building or structure.
Page 8 Appendix A • Volume 2
Applicable Law Provision Responsible Agency Contact
Ontario Heritage Act:
Subsection 27(9) of the Ontario Heritage Act, with
respect to a notice to the council of a municipality to the
demolition or removal of a building from a registered
property.
Subsection 30(2) of the Ontario Heritage Act, with
respect to a consent of the council of a municipality to
the alteration or demolition of a building.
Section 33 of the Ontario Heritage Act, with respect to
the consent of the council of a municipality for the Local Municipality
alteration of a property.
Section 34 of the Ontario Heritage Act, with respect to
the consent of the council of a municipality for the
demolition of a building.
By-laws made under Section 40.1 of the Ontario Heritage
Act
Section 42 of the Ontario Heritage Act, with respect to
the permit given by the council of a municipality for the
erection, alteration, or demolition of a building.
Ontario Heritage Act:
Section 34.5 of the Ontario Heritage Act, with respect to
a consent of the Minister to the alteration or demolition of
Ministry of Tourism, General Inquiry:
a designated building ph: 416-326-9326
Culture and Sport
Subsection 34.7(2) of the Ontario Heritage Act, with
respect to a consent of the Minister to the alteration or
demolition of a designated building
General Inquiry:
ph: 416-585-7041
Ontario Planning and Development Act, 1994, Central Municipal Services Office
Section 14 Ontario Planning and Development Act, 1994, ph: 416-585-6226 or 800-668-0230
with respect to any conflict between a development plan Eastern Municipal Services Office
Ministry of Municipal Affairs ph: 613-545-2100 or 800-267-9438
made under that Act and a zoning by-law that affects the Northeastern Municipal Services Office
and Housing
proposed building or structure. ph: 705-564-0120 or 800-461-1193
Subsection 17(1) Ontario Planning and Development Northwestern Municipal Services Office
Act, 1994 with respect to orders made under that Act. ph: 807-475-1651 or 800-465-5027
Southwestern Municipal Services Office
ph: 519-873-4020 or 800-265-4736
Appendix A • Volume 2 Page 9
Applicable Law Provision Responsible Agency Contact
Planning Act:
Section 33 of the Planning Act, except where in the case
of demolition of a residential property, a permit to
demolish the property is obtained under that Section
By-laws made under Sections 34 or 38 of the Planning
Act.
Section 41 of the Planning Act, with respect to the
approval by the council of the municipality of the
Municipal Board of plans and drawings. Local Municipality
Section 42 of the Planning Act, with respect to the
payment of money to the Municipality.
Section 46 of the Planning Act.
By-laws made under O. Reg. 608/06 (Development
Permits) made under the Planning Act.
By-laws made under O. Reg. 246/01 (Development
Permits) made under the Planning Act.
General Inquiry:
ph: 416-585-7041
Central Municipal Services Office
ph: 416-585-6226 or 800-668-0230
Planning Act: Eastern Municipal Services Office
Ministry of Municipal Affairs ph: 613-545-2100 or 800-267-9438
Section 47 of the Planning Act, with respect to orders and Housing Northeastern Municipal Services Office
made under that Act. ph: 705-564-0120 or 800-461-1193
Northwestern Municipal Services Office
ph: 807-475-1651 or 800-465-5027
Southwestern Municipal Services Office
ph: 519-873-4020 or 800-265-4736
Public Lands Act:
Section 2 of O. Reg. 453/96 of the Public Lands Act, Ministry of Natural Resources General Inquiry
with respect to the work permit from the Minister and Forestry ph: 800-667-1940
authorizing the construction or placement of a building on
public land.
General Inquiry
ph: 800-268-4686
Central Region:
Public Transportation and Highway Improvement Act: ph: 416-235-5412
Eastern Region:
Section 34 or 38 of the Public Transportation and ph: 800-267-0295
Highway Improvement Act, with respect to the permit Ministry of Transportation Northeastern Region:
from the Minister for the placement, erection or alteration ph: 705-472-7900 or 800-461-9547
of any building or other structure or the use of land. Northwestern Region:
ph: 807-473-2000 or 800-465-5034
Southwestern Region:
ph: 519-873-4335 or 800-265-6072
Page 10 Appendix A • Volume 2
A-1.5.1.1.(1)Application of Referenced Documents.
Documents referenced in the Building Code may contain provisions covering a wide range of issues, including issues that are
unrelated to the objectives and functional statements stated in Parts 2 and 3 of Division A respectively; e.g. aesthetic issues
such as colour-fastness or uniformity. Sentence 1.5.1.1.(1) is intended to make it clear that, whereas referencing a document
in the Building Code generally has the effect of making the provisions of that document part of the Code, provisions that are
unrelated to buildings or to the objectives and functional statements attributed to the provisions in Division B where the
document is referenced are excluded.
Furthermore, many documents referenced in the Building Code contain references to other documents, which may also, in
turn, refer to other documents. These secondary and tertiary referenced documents may contain provisions that are unrelated
to buildings or to the objectives and functional statements of the Building Code: such provisions - no matter how far down
the chain of references they occur - are not included in the intent of Sentence 1.5.1.1.(1) of Division A.
A-1.1.2.1.(2)Winter Design Temperatures.
The 2.5 percent values referenced in Sentence 1.1.2.1.(2) are the least restrictive temperatures that can be used. If a designer
chooses to use the 1 percent values shown in MMAH Supplementary Standard SB-1, they would be in excess of the Code
minimums and would be considered acceptable.
A-1.3.2.1.Abbreviations of Proper Names.
The following table provides contact information for organizations referenced in this Code:
Name Address Contact
American Conference of Governmental Industrial Hygienists ph: 513-742-2020
ACGIH 1330 Kemper Meadow Drive fax: 513-742-3355
Cincinnati, Ohio 45240 USA web site: www.acgih.org
American Iron and Steel Institute ph: 202-452-7100
AISI 25 Massachusetts Ave., NW Suite 800 fax: 202-452-1039
Washington, DC 20001 USA web site: www.steel.org
American National Standards Institute ph: 212-642-4900
ANSI 25 West 43rd Street, 4th Floor fax: 212-398-0023
New York, New York 10036 USA web site: www.ansi.org
The Engineered Wood Association ph: (253) 620-7400
7011 S. 19th Street fax: (253) 565-7265
APA
Tacoma, WA 98466-5333 USA web site: www.apawood.org
American Public Health Association ph: 202-777-2742
APHA 800 I Street, NW fax: 202-777-2534
Washington, DC 20001 USA web site: www.apha.org
American Society of Civil Engineers
ph: 800-584-2723
ASCE 1801 Alexander Bell Drive
web site: www.asce.org
Reston, VA 20191 USA
American Society of Heating, Refrigerating and Air-Conditioning ph: 404-636-8400
Engineers 800-527-4723
ASHRAE
1791 Tullie Circle, N.E. fax: 404-321-5478
Atlanta, Georgia 30329 USA web site: www.ashrae.org
The American Society of Mechanical Engineers ph: 800-843-2763
ASME Three Park Avenue fax: 973-882-1717
New York, New York 10016-5990 USA web site: www.asme.org
American Society of Plumbing Engineers ph: 847-296-0002
ASPE 6400 Shafer Court, Suite 350 fax: 847-296-2963
Rosemont, Illinois 60018 USA web site: www.aspe.org
American Society of Sanitary Engineering ph: 440-835-3040
ASSE 901 Canterbury Suite A fax: 440-835-3488
Westlake, Ohio 44145 USA web site: www.asse-plumbing.org
American Society for Testing and Materials
ph: 610-832-9585
100 Barr Harbor Drive
ASTM fax: 610-832-9555
PO Box C700
web site: www.astm.org
West Conshohocken, Pennsylvania 19428-2959 USA
Page 12 Appendix A • Volume 2
Name Address Contact
American Welding Society ph: 800-443-9353
AWS 8669 NW 36th Street, Suite 130 fax: 305- 443-5647
Doral, Florida 33166 USA web site: www.aws.org
ph: 303-794-7711;
American Water Works Association
800-926-7337
AWWA 6666 W. Quincy Ave.
fax: 303-347-0804
Denver, Colorado 80235 USA
web site: www.awwa.org
British Columbia Ministry of Health
ph: (250) 952-1469
Population Health and Wellness, Health Protection
BCMOHS fax: (250) 952-1713
1515 Blanshard Street, 4th Floor
web site: http://www.health.gov.bc.ca
Victoria, British Columbia V8W 3C8
ph: 418-652-2238
Bureau de Normalisation du Québec
800-386-5114
BNQ 333, rue Franquet
fax: 418-652-2292
Québec, Québec G1P 4C7
web site: www.bnq.qc.ca
Canadian Commission on Building and Fire Codes
National Research Council Canada ph: 613-993-9960
CCBFC Building M-23A fax: 613-952-4040
1200 Montreal Road web site: www.nationalcodes.ca
Ottawa, Ontario K1A 0R6
ph: 819-956-0425
Canadian General Standards Board
800-665-2472
CGSB 11 Laurier Street
fax: 819-956-5740
Gatineau, Quebec K1A 1G6
web site: www.pwgsc.gc.ca/cgsb
ph: 416-747-4044
Canadian Standards Association
800-463-6727
CSA 5060 Spectrum Way, Suite 100
fax: 416-747-2510
Mississauga, Ontario L4W 5N6
web site: www.csa.ca
ph: 613-747-5544
Canadian Wood Council
800-463-5091
CWC 99 Bank Street, Suite 400
fax: 613-747-6264
Ottawa, Ontario K1P 6B9
web site: www.cwc.ca
Institute for Research in Construction
National Research Council Canada
Building M-23A ph: 613-993-9960
DBR 1200 Montreal Road fax: 613-952-4040
Ottawa, Ontario K1A 0R6 web site: www.nationalcodes.ca
The Division of Building Research (DBR) is now known as the
Institute for Research in Construction.
Environmental Protection Agency
ph: (202) 272-0167
EPA Ariel Rios Building
web site: www.epa.gov
1200 Pennsylvania Avenue, N.W. Washington, DC 20460 USA
FINA World Aquatics
ph: (+41-21) 310-47-10
(now World Chemin de Bellevue 24a/24b
web site: www.worldaquatics.com
Aquatics) CH-1005 Lausanne, Switzerland
Green Roofs for Healthy Cities
ph. 416-971-4494
GRHC 406 King Street East
web site: www.greenroofs.org
Toronto, Ontario M5A 1L4
Appendix A • Volume 2 Page 13
Name Address Contact
Health Canada ph: 866-225-0709
HC Address Locator 0900C2 fax: 613-941-5366
Ottawa, Ontario K1A 0K9 web site: www.hc-sc.gc.ca
Hydronics Institute Division of GAMA
ph: 866-408-3831
35 Russo Place
908-464-8200
HI P.O. Box 218
fax: 908-464-7818
Berkeley Heights, New Jersey 07922 USA
web site: www.gamanet.org
The Hydronics Institute was formally merged into GAMA in 2004.
Hardwood Plywood & Veneer Association
ph: 703-435-2900
(Now Decorative Hardwoods Association)
HPVA fax: 703-435-2573
42777 Trade West Dr
web site: decorativehardwoods.org
Sterling, VA 20166 USA
Heating, Refrigerating and Air-Conditioning Institute of Canada ph: 905-602-4700
2800 Skymark Avenue 800-267-2231
HRAI
Building 1, Suite 201 fax: 905-602-1197
Mississauga, Ontario L4W 5A6 web site: www.hrai.ca
Home Ventilating Institute ph: 847-526-2010
HVI 1000 N. Rand Rd. Suite 214 fax: 847-526-3993
Wauconda, Illinois 60084 USA web site: www.hvi.org
International Association of Plumbing and Mechanical Officials ph: 909-472-4100
IAPMO 4755 E. Philadelphia St. fax: 909-472-4150
Ontario, California 91761 USA web site: iampo.org
Illuminating Engineering Society of North America ph: 212-248-5000
IESNA 120 Wall Street, Floor 17 fax: 212-248-5017
New York, New York 10005-4001 USA web site: www.iesna.org
International Organization for Standardization
ISO Central Secretariat ph: 41-22-749-01-11
ISO 1, ch. de la Voie-Creuse fax: 41-22-733-34-30
CP 56 web site: www.iso.org
CH-1211 Geneva 20, Switzerland
U.S. Department of Housing and Urban Development
HUD established HUD USER as the primary source of US ph: 202-708-3178
government technical housing publications. 800-245-2691
HUD
HUD USER fax: 202-708-9981
P.O. Box 23268 web site: www.huduser.org
Washington, DC 20026-3268 USA
Ontario Ministry of the Environment ph: 416-325-4000
MOE (Ontario Ministry of the Environment, Conservation and Parks) fax: 416-314-6713
(now MECP) 135 St Clair Avenue West web site: www.ontario.ca/ministry-
Toronto, Ontario M4V 1P5 environment-conservation-parks
National Fire Protection Association 617-770-3000
NFPA 1 Batterymarch Park fax: 617-770-0700
Quincy, Massachusetts 02169-7471 USA web site: www.nfpa.org
National Fenestration Rating Council ph: 301-589-1776
NFRC 6305 Ivy Lane, Suite 140 fax: 301-589-3884
Greenbelt, MD 20770, USA web site: www.nfrc.org
Page 14 Appendix A • Volume 2
Name Address Contact
National Lumber Grades Authority ph: 604-524-2393
NLGA #302 -960 Quayside Drive, fax: 604-524-2893
New Westminster, British Columbia V3M 6G2 web site: www.nlga.org
Natural Resources Canada ph: 613-995-2943
NRCan Office of Energy Efficiency 800-387-2000
580 Booth St., 18th Floor web site: www.nrcan-rncan.gc.ca
Ottawa, Ontario K1A 0E4
NSF International ph: 734-769-8010
NSF P.O. Box 130140 fax: 734-769-0109
789 N. Dixboro Road web site: www.nsf.org
Ann Arbor, Michigan 48113-0140 USA
SEI See ASCE
Sheet Metal and Air Conditioning Contractors National Association ph: 703-803-2980
SMACNA Inc. fax: 703-803-3732
4201 Lafayette Center Drive web site: www.smacna.org
Chantilly, Virginia 20151-1219 USA
Single Ply Roofing Industry
ph: 781-647-7026
SPRI 465 Waverley Oaks Road
fax: 781-647-7222
Suite 421
web site: www.spri.org
Waltham, MA 02452
ph: 613-990-2309
Transport Canada
866-995-9737
TC 330 Sparks Street
fax: 613-954-4731
Ottawa, Ontario K1A 0N5
web site: www.tc.gc.ca
Truss Plate Institute of Canada
c/o Jager Metal Products, #220
6223 2nd Street East, Calgary, Alberta T2H 1J5
TPIC web site: www.tpic.ca
The TPIC, “Truss Design Procedures and Specifications for Light
Metal Plate Connected Wood Trusses” is available on-line at: the
TPIC web site at: www.tpic.ca.
Underwriters Laboratories Inc.
ph: 847-272-8800
UL 333 Pfingsten Road
web site: www.ul.com
Northbrook, Illinois 60062-2096 USA
Underwriters' Laboratories of Canada ph: 866-937-3852
ULC 7 Underwriters Road fax: 416-757-8727
Toronto, Ontario M1R 3A9 web site: www.ulc.ca
United States Department of Agriculture
USDA 1400 Independence Ave., S.W. web site: www.usda.gov
Washington, DC 20250 USA
Water Environment Federation ph: 800-666-0206
WEF 601 Wythe Street fax: 703-684-2492
Alexandria, Virginia 22314-1994 USA web site: www.wef.org
Waterfront Toronto ph: 416-214-1344
WT 20 Bay Street, Suite 1310 fax: 416-244-4591
Toronto, Ontario M5J 2N8 web site: info@waterfrontoronto.ca
Appendix A • Volume 2 Page 15
A-1.2.1.1.Design by Architect or Professional Engineer.
The practice of architecture is regulated by the Architects Act. The practice of professional engineering is regulated by the
Professional Engineers Act. Professional design requirements related to the design of buildings are regulated by the
Professional Engineers Act and the Architects Act.
Certain foundations, sprinkler protected glazed wall assemblies, shelf and rack storage systems, tent framing and sign
structures are required to be designed by a suitably qualified and experienced person. Refer to Article 1.2.2.1. for general
review by an Architect or a Professional Engineer of these assemblies and systems.
Refer to the “Use of the Professional Engineer’s Seal” published by Professional Engineers Ontario for guidance on the
proper use of a Professional Engineer’s seal.
A-1.2.2.1.General Review by Architect or Professional Engineer.
In addition to the general review of the construction of buildings described in Table 1.2.2.1. by an Architect or Professional
Engineer, Sentences 1.2.2.1.(4) to (10) require general review by an Architect or a Professional Engineer of certain
foundations, sprinkler protected glazed wall assemblies, shelf and rack storage systems, tent framing and sign structures.
These assemblies and systems are required to be designed by a suitably qualified and experienced person, as detailed in
Article 1.2.2.1.
This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.
A-1.3.6.1.As Constructed Plans.
The intent of the provision for as constructed plans is to provide the municipality with authority to ask for information that is
necessary for the enforcement of the Act and the Building Code. The intent of the provision is not to duplicate the permit
approval process and require similar information to be filed upon completion of the project. Similarly, the provision is not
intended to require information and documentation beyond those that are normally generated in the building permit approval
process.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.