Change of use and renovation (Parts 10 and 11) (Powers and Duties of Registered Code Agencies)

Last updated October 22, 2026

Values this chapter turns on

occupant load increase that reduces performance level: 15%; occupant load increase that reduces performance level
max height for a sprinklered residential conversion: 6 storeys; max height for a sprinklered residential conversion
combustible extension above this must be sprinklered: 4 storeys; combustible extension above this must be sprinklered
age below which compliance alternatives are limited: 5 years; age below which compliance alternatives are limited

Parts 10 and 11 of Division B govern existing buildings: Part 10 when the use changes, Part 11 when an existing building is extended, materially altered or repaired. An RCA reviewing a renovation must decide whether the work reduces the building's "performance level" and, if so, what compensating construction is needed, and whether a compliance alternative may stand in for a current requirement. The exam tests the triggers and the numbers. This chapter paraphrases the Code and cites article numbers; it does not reproduce the Part 11 tables.

Key terms

Term	Meaning in our words
Performance level	The level at which all or part of an existing building functions with respect to its building systems
Construction index (C.I.)	A level from 1 to 8 from Table 11.2.1.1.-A for the expected performance of the structure, based on construction type and fire protection
Hazard index (H.I.)	The occupancy rating from Tables 11.2.1.1.-B to -N
Compliance alternative (C.A.)	A substitute for a requirement elsewhere in Division B, listed in Part 10 or 11
Building system (B 11.1.1.2.)	A complete major division of construction, for example structure, roofing, sprinklers, fire alarm, HVAC, plumbing, sewage or electrical

Change of use: scope, classification and performance level (Part 10)

B 10.1.1.2. deems several changes to be a change in major occupancy even within the same group: converting one Group C suite into more than one, converting Group A-2 or A-4 space to gaming premises, changing a farm building to a non-G occupancy or to G-1, changing to a post-disaster building or a retirement home, or a change where the previous major occupancy cannot be determined.

Existing buildings are classified by major occupancy under Part 2 or 3.1.2. (B 10.2.1.1.) and by C.I. and H.I. under 11.2.1.1. (B 10.2.1.2.); Group G may be calculated as F-2. The building size and construction articles of Parts 2 and 3 do not apply.

B 10.3.1.1. lists provisions the changed building must meet for its new occupancy (for example 3.2.6. high building rules, 3.7. health requirements, public pool and spa rules, and listed Part 9 items). B 10.3.2.1.: after the change, the performance level must not be less than before. B 10.3.2.2. says when it is reduced:

Trigger	Reduced unless
Floor and roof framing cannot carry the new loads	The affected floor is load-restricted and signs are posted
Early warning and evacuation systems below Table 10.3.2.2.-A for the new use
New occupancy has a higher hazard index	The new H.I. does not exceed the existing C.I. (with a credit of 1 for small or medium buildings facing multiple streets, subject to conditions)
Combustible building changed to residential where a new building would need noncombustible or 3.2.2.51./3.2.2.60. construction	Sprinklered and not more than 6 storeys
Inadequate fire separations between occupancies
Building would not meet 3.1.3.2. or 9.10.9.14.
Sewage flow exceeds system capacity, or prohibited sewage
Change to a retirement home without full sprinklers, required voice communication or self-closers

B 10.4.1.1.: compliance alternatives may be substituted (see below), but for a building in existence less than five years only for the limited requirements named there.

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Renovation: classification and proposed construction (Part 11)

B 11.1.2.1.: for extension, material alteration or repair, the proposed construction complies with Section 11.3, and the performance level is evaluated and compensating construction done under Section 11.4.

Article	Rule
11.2.1.1.	Where construction changes the major occupancy, classify by C.I. and H.I.
11.2.1.3.	Part 11 does not relieve compliance with 2.2.1.2., 3.1.3.2. or 9.10.9.14.
11.3.1.1.	A materially altered or repaired system keeps at least its prior performance level
11.3.1.2.	New systems and extensions of systems comply with the other Parts (subject to 11.3.3.1. and 11.5)
11.3.2.1.	When extended, Part 11 governs the existing portion; the extension meets the other Parts
11.3.3.1.	Basic renovation: reuse similar materials to keep character, if early warning, fire separations, structure and health are not harmed
11.3.3.2.	Extensive renovation: substantially removed and replaced walls, ceilings, floors or roofs trigger current structural and fire-resistance rules; suite barrier-free rules over 300 m²; sprinklers for Group C storeys in buildings over 3 storeys; retirement home upgrades
11.3.4.1.	Part 7 applies to plumbing in the altered or extended parts and to adversely affected plumbing
11.3.5.	Septic tank alterations meet Part 8; vertical separation to the water table applies to the whole altered sewage system

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Performance level evaluation and compensating construction (11.4)

B 11.4.1.1.: performance level after construction must not be less than before; if reduced, compensating construction under 11.4.3.

Reduction trigger (11.4.2)	Compensating construction (11.4.3)
Structure inadequate after a change of occupancy, an occupant load increase over 15%, or a live load increase	Remedial measures, or load restriction with posted signs
Occupant load up more than 15%, or up 15% or less but more than 15% over the fire alarm threshold or the exit capacity	Evaluate and upgrade early warning and evacuation per Table 11.4.3.3. (Group C exceptions at small occupant loads)
Change to a higher hazard index and the other listed changes	Raise the C.I. to at least the new H.I. per Table 11.4.3.4.-A
Plumbing adversely affected	Upgrade per Part 7
Sewage system adversely affected or overloaded	Upgrade per Part 8
Combustible building extended to more than four storeys	Sprinkler the building

Compensating construction applies to the part being altered (fire separations above, below and beside, and exits where affected) and to adversely affected systems (B 11.4.3.1.).

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Compliance alternatives (11.5)

B 11.5.1.1.:

Requirement replaced	Condition
Part 3, 4, 6 or 8	The CBO is satisfied compliance is impracticable because of structural or construction difficulties, or because it would harm the preservation of a heritage building
Part 9 or 12	No impracticability finding needed

Note the wording: the CBO must be satisfied. An RCA reviewing the file documents the impracticability case, but the Code text names the chief building official.

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Worked scenarios

Scenario 1. A renovation raises a restaurant's occupant load from 120 to 132 persons (10%). The 15% trigger in 11.4.2.2.(1) is not met, but check 11.4.2.2.(2) and (3) against the fire alarm threshold and exit capacity.

Scenario 2. An owner adds a fifth storey to a four-storey combustible building. The performance level is reduced under 11.4.2.6.; the building must be sprinklered.

Scenario 3. A Part 9 house conversion uses a compliance alternative from Table 11.5.1.1.-C for a Part 9 requirement. No impracticability finding is needed.

Common traps

Treating every renovation as needing full compliance. Part 11 uses performance levels and compensating construction.
Forgetting that some same-group changes (one Group C suite into two) are deemed changes in major occupancy.
Applying the impracticability test to Part 9 compliance alternatives.

Chapter review

Chapter at a glance

One line per section: the idea to carry into the exam. Then the answers that most often catch candidates out.

Chapter at a glance: the key idea in each section
Section	Key idea
Change of use: scope, classification and performance level (Part 10)	Existing buildings are classified by major occupancy under Part 2 or 3.1.2. and by C.I. and H.I. under 11.2.1.1.; Group G may be calculated as F-2. The building size and…
Performance level evaluation and compensating construction (11.4)	Compensating construction applies to the part being altered (fire separations above, below and beside, and exits where affected) and to adversely affected systems.
Compliance alternatives (11.5)	Note the wording: the CBO must be satisfied.

Change of use: scope, classification and performance level (Part 10)
Existing buildings are classified by major occupancy under Part 2 or 3.1.2. and by C.I. and H.I. under 11.2.1.1.; Group G may be calculated as F-2. The building size and…
Performance level evaluation and compensating construction (11.4)
Compensating construction applies to the part being altered (fire separations above, below and beside, and exits where affected) and to adversely affected systems.
Compliance alternatives (11.5)
Note the wording: the CBO must be satisfied.

Usual exam traps

Treating every renovation as needing full compliance. Part 11 uses performance levels and compensating construction.
Forgetting that some same-group changes (one Group C suite into two) are deemed changes in major occupancy.
Applying the impracticability test to Part 9 compliance alternatives.

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Questions on Change of use and renovation (Parts 10 and 11), in the exam format, every answer explained and cited to its article. Sign in to start; a free account gets the free questions.

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Code cited in this chapter

Based on the official 2024 Building Code Compendium on ontario.ca.

OBC Div. A 1.4.1.2.(1) Performance level
Performance level means the level of performance under which all or part of an existing building functions with respect to its building systems.
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OBC Div. A 1.4.1.2.(1) Construction index
Construction index means a level on a scale of 1 to 8 determined in accordance with Table 11.2.1.1.-A of Division B designating the expected performance level of the building structure with respect to the type of construction and fire protection of an existing building, and "C.I." has a corresponding meaning.
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OBC Div. A 1.4.1.2.(1) Compliance alternative
Compliance alternative means a substitute for a requirement in another Part of Division B that is listed in Part 10 or 11 of Division B, and "C.A." has a corresponding meaning.
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OBC Div. B 11.1.1.2. Definitions
(1)In this Part,
Building system means a combination of elements or components that form a complete major division of construction in the design of a building or part of a building, including a structural or framing system, a waterproofing system, a drainage system, an exterior cladding system, a roofing system, a window system, a partition system, a corridor system, a stair system, a fire alarm and detection system, a sprinkler system or a heating, ventilation or air-conditioning system, a foundation system, a standpipe and hose system, a flooring system, a plumbing system, a sewage system or an electrical system.
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OBC Div. B 10.1.1.2. Change in Major Occupancy
(1)The following changes of use are also deemed to be a change in major occupancy for the purposes of this Part:
(a)a suite of a Group C major occupancy is converted into more than one suite of a Group C major occupancy,
(b)a suite or part of a suite of a Group A, Division 2 or Group A, Division 4 major occupancy is converted to a gaming premises,
(c)a farm building or part of a farm building is changed to another major occupancy other than a Group G major occupancy,
(d)a building or part of a building is changed to a post-disaster building,
(e)a building or part of a building is changed to a retirement home,
(f)the use of a building or part of a building is changed and the previous major occupancy of the building or part of the building cannot be determined, or
(g)a farm building or part of a farm building is changed to a Group G, Division 1 major occupancy.
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OBC Div. B 10.2.1.1. Classification of Major Occupancy
(1)Every existing building or part of it shall be classified according to its major occupancy in accordance with the requirements of Part 2 or Subsection 3.1.2.
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OBC Div. B 10.2.1.2. Classification According to Construction and Occupancy
(1)Except as provided in Sentence (2), for the purposes of this Part, existing buildings shall be classified as to their construction and occupancy as provided for in Sentence 11.2.1.1.(1).
(2)For the purpose of Parts 10 and 11, the calculation of the construction index and hazard index for Group G major occupancy is permitted to be based on Group F, Division 2 major occupancy.
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OBC Div. B 10.3.1.1. General
(1)Except as provided in Section 10.4., a building or part of a building subject to a change of major occupancy shall conform to the requirements of Subsection 3.2.6., Sections 3.7., 3.11. and 3.12., Sentences 6.3.1.1.(2) and 6.3.2.7.(1), Subsections 9.5.1. and 9.5.3., 9.5.3A. to 9.5.3F. and 9.5.4., Sentences 9.6.1.4.(3), (4), Article 9.7.2.3., Sentences 9.8.8.1.(4) to (8) and 9.9.10.1.(1) to (7), Subsection 9.10.17., Sections 9.31. and 9.32., Sentence 9.33.6.13.(7.1), and Subsections 9.34.1. to 9.34.3. as they apply to the new major occupancy that the building or part of a building is to support.
(2)Where a major occupancy is changed to a Group B, Division 2 major occupancy, heating, ventilating, and air conditioning systems shall conform to the requirements of Sentence 6.2.1.1.(1).
(3)Where a major occupancy is changed to a Group B, Division 3 major occupancy, ventilation, air circulation, and filtration systems, shall conform to the requirements of Sentence 6.2.1.1.(1).
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OBC Div. B 10.3.2.1. General
(1)The performance level of a building after the change of major occupancy shall not be less than the performance level prior to the change of major occupancy.
(2)For the purposes of Sentence (1), reduction of performance level shall be determined in accordance with Article 10.3.2.2.
(3)For the purpose of this Subsection, where a permit to construct a farm building has been applied for before January 1, 2025, the performance level of the farm building is permitted to be evaluated based on the applicable requirements of Ontario Regulation 332/12 (Building Code) made under the Act, as it read on December 31, 2024.
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OBC Div. B 10.3.2.2. Reduction in Performance Level
(1)Except as provided in Sentence (2), the performance level of a building or part of a building is reduced where the existing structural floor and roof framing systems and their supporting members are not adequate to support the proposed dead loads and live loads of the new major occupancy that the building is to support.
(2)The inadequacy of the existing structural floor or roof framing system and its supporting members to support the proposed dead loads and live loads does not reduce the performance level of the building if the portion of the floor affected by the proposed loads is restricted to the loading it will support and signs stating the restrictions are posted.
(3)Except as provided in Section 10.4., the performance level of a building or part of a building is reduced where the early warning and evacuation systems requirements of the building do not meet the early warning and evacuation systems requirements set out in Table 10.3.2.2.-A for the new major occupancy that the building is to support.
(4)Except as provided in Sentence (5), the performance level of an existing building is reduced where a change in use will result in a change of the major occupancy of all or part of an existing building to another major occupancy of a greater hazard index.
(5)Except as provided in Sentence (6), if the hazard index of the new major occupancy is greater than the hazard index of the existing major occupancy, the performance level is not reduced where the hazard index of the new major occupancy is not greater than the construction index of the existing building.
(6)Small or medium sized existing buildings as determined in Tables 11.2.1.1.-B to 11.2.1.1.-N facing multiple streets may be assigned a hazard index credit of 1, which may be subtracted from the hazard index of the new major occupancy provided,
(a)the building does not contain a Group B, Division 1, a Group C, or a Group F, Division 1 occupancy, and
(b)firefighting access complying with Articles 3.2.5.1. to 3.2.5.5. or Subsection 9.10.20. is provided.
(7)Except as provided in Sentence (8), the performance level of a building or part of a building is reduced in an existing building of combustible construction where,
(a)the occupancy is changed to a residential occupancy in all or part of the building, and
(b)if the building was new, it would have been required to be of noncombustible construction or to be constructed in accordance with Article 3.2.2.51. or 3.2.2.60.
(8)A change in the occupancy of a building or part of a building to a residential occupancy does not reduce the performance level of the building or part of the building where,
(a)the building is sprinklered, and
(b)the building does not exceed 6 storeys in building height.
(9)The performance level of a building or part of a building is reduced where the new major occupancy in an existing building of multiple occupancy is not separated from adjoining major occupancies by fire separations having fire-resistance ratings conforming to Article 3.1.3.1., Subsection 9.10.9. or Table 10.3.2.2.-B.
(10)The performance level of a building is reduced where the building after the change of major occupancy will not comply with Article 3.1.3.2. or 9.10.9.14.
(11)The performance level of a building or part of a building is reduced where, after a change of major occupancy,
(a)the total daily design sanitary sewage flow of the new major occupancy, calculated in accordance with Article 8.2.1.3., exceeds the capacity of any component of a sewage system serving the building, or
(b)the type or amount of sanitary sewage that will, under the new major occupancy, be discharged to a sewage system serving the building is prohibited by Article 8.1.3.1.
(12)The performance level of an existing building or part of an existing building is reduced where,
(a)the use of the building or part of the building is changed to a retirement home, and
(b)any of the following applies:
(i)the retirement home is not sprinklered throughout,
(ii)Clause 3.2.6.8.(1)(b) or
(c)as applicable, requires that a voice communication system conforming to Article 3.2.4.22. be provided in the building and such a system is not provided in the building, or
(iii) the retirement home contains one or more doors to suites or sleeping rooms not within suites, other than doors leading directly to the exterior, that are not equipped with self-closing devices.
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OBC Div. B 10.4.1.1. Substitution
(1)Except as provided in Sentence (3), a compliance alternative to a requirement contained in Part 3, 4, 6 or 8 that is shown in Tables 11.5.1.1.-A, 11.5.1.1.-B, 11.5.1.1.-C, 11.5.1.1.-D/E or 11.5.1.1.-F may be substituted for the requirement where the chief building official is satisfied that compliance with the requirement is impracticable because,
(a)of structural or construction difficulties, or
(b)it is detrimental to the preservation of a heritage building.
(2)Except as provided in Sentence (3), a compliance alternative to a requirement contained in Part 9 or 12 shown in Tables 11.5.1.1.-C, 11.5.1.1.-D/E or 11.5.1.1.-F may be substituted for the requirement without satisfying the chief building official that the requirement is impracticable.
(3)Where the building has been in existence for less than five years, compliance alternatives may only be used in respect of requirements of this Division that are referenced in Sentences 10.3.2.2.(3), (5) and Table 10.3.2.2.-B.
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OBC Div. B 11.1.2.1. Extension, Material Alteration or Repair
(1)Where an existing building is subject to extension, material alteration or repair,
(a)the proposed construction shall comply with Section 11.3., and
(b)the performance level of the building shall be evaluated and compensating construction shall be undertaken in accordance with Section 11.4.
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OBC Div. B 11.2.1.1. Construction Index and Hazard Index
(1)Where proposed construction will result in the change of major occupancy of all or part of an existing building to another major occupancy, the building shall be classified as to its,
(a)construction on the basis of its construction index as provided for in this Part, including Table 11.2.1.1.-A, and (See Note A-11.2.1.1.(1)(a))
(b)occupancy on the basis of its hazard index as provided for in this Part, including Tables 11.2.1.1.-B to 11.2.1.1.-N. (See Note A-11.2.1.1.(1)(b))
(2)Small or medium sized existing buildings as determined in Tables 11.2.1.1.-B to 11.2.1.1.-N facing multiple streets may be assigned a hazard index credit of 1, which may be subtracted from the hazard index of the proposed major occupancy to reduce the additional upgrading required by Table 11.4.3.4.-A provided,
(a)the building does not contain a Group B, Division 1, a Group C, or a Group F, Division 1 occupancy, and
(b)firefighting access complying with Articles 3.2.5.1. to 3.2.5.5. or Subsection 9.10.20. is provided.
(3)The requirements of Articles 2.2.2.3. to 2.2.2.8. and 3.2.2.20. to 3.2.2.93. do not apply to this Part.
(4)For the purpose of this Part, the calculation of the construction index and hazard index for a Group G major occupancy is permitted to be based on a Group F, Division 2 major occupancy.
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OBC Div. B 11.2.1.3. Prohibition of Occupancy Combinations
(1)Nothing in this Part relieves an applicant from complying with the requirements of Article 2.2.1.2., 3.1.3.2. or 9.10.9.14.
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OBC Div. B 11.3.1.1. Material Alteration or Repair of a Building System
(1)Where an existing building system is materially altered or repaired, the performance level of the building after the material alteration or repair shall be at least equal to the performance level of the building prior to the material alteration or repair. (See Note A-11.3.1.1.(1))
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OBC Div. B 11.3.1.2. New Building Systems and Extension of Existing Building Systems
(1)Except as provided in Article 11.3.3.1. and Section 11.5., the design and construction of a new building system or the extension of an existing building system, shall comply with all other Parts. (See Note A-11.3.1.2.(1))
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OBC Div. B 11.3.2.1. Portion of Extended Buildings
(1)Where an existing building is extended,
(a)this Part applies to the existing portion of the building, and
(b)the extended portion of the building shall comply with all other Parts.
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OBC Div. B 11.3.3.1. Basic Renovation
(1)Except as provided in Sentence (2) and Article 11.3.3.2., construction may be carried out to maintain the existing performance level of all or part of an existing building, by the reuse, relocation or extension of the same or similar materials or components, to retain the existing character, structural uniqueness, heritage value, or aesthetic appearance of all or part of the building, if the construction will not adversely affect the early warning and evacuation systems, fire separations or the structural adequacy or will not create an unhealthy environment in the building.
(2)Construction in respect of a Group B, Division 3 occupancy, a hotel or a retirement home may be carried out in accordance with Sentence (1) only if the construction will be in conformance with the Fire Code made under the Fire Protection and Prevention Act, 1997.
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OBC Div. B 11.3.3.2. Extensive Renovation
(1)Where existing interior walls or ceilings or floor assemblies or roof assemblies are substantially removed in an existing building and new interior walls, ceilings, floor assemblies or roof assemblies are installed in the building, structural and fire-resistance elements shall be constructed in compliance with the requirements of the other Parts.
(2)Except as provided in Section 11.5., the proposed construction within an existing suite shall comply with the requirements of Section 3.8. where,
(a)new interior walls or floor assemblies are installed,
(b)the suite has an area greater than 300 m², and
(c)the suite is located in,
(i)a floor area where the existing difference in elevation between the adjacent ground level and the floor level is not more than 200 mm, or
(ii)a normally occupied floor area which is accessible by a passenger type elevator or other platform equipped passenger elevating device from an entrance storey where the existing difference in elevation between the adjacent ground level and the entrance storey level is not more than 200 mm.
(3)Except as provided in Section 11.5., the proposed construction within an existing suite, other than a suite described in Sentence (2) or a suite in a building described in Clause 3.8.1.1.(1)(a), (b), (c) or (d), shall comply with the requirements of Sentences 3.8.1.3.(6), 3.8.2.3.(6), 3.8.3.1.(6), 3.8.3.3.(19), 3.8.3.7.(1), 3.8.3.15.(5) and 3.8.3.16.(4) where new interior walls or floor assemblies are installed. (See Note A-11.3.3.2.(3))
(4)Except as provided in Sentence (5), where existing interior walls or ceilings or floor assemblies or roof assemblies are substantially removed on any storey in an existing building and new interior walls, ceilings, floor assemblies or roof assemblies are installed, the storey shall be sprinklered if,
(a)the storey will contain a Group C major occupancy, and
(b)the building is over 3 storeys in building height.
(5)Sentence (4) does not apply where the building,
(a)conforms to Subclause 3.2.2.50.(1)(a)(ii), and
(b)contains dwelling units having means of egress conforming to Sentence 3.3.4.4.(8).
(6)Where existing interior walls or ceilings or floor assemblies or roof assemblies are substantially removed and new interior walls, ceilings, floor assemblies or roof assemblies are installed in an existing building or part of an existing building that is a retirement home, the following requirements apply:
(a)the retirement home shall be sprinklered,
(b)a voice communication system conforming to Article 3.2.4.23. shall be provided in the building, if Clause 3.2.6.8.(1)(b) or
(c)as applicable, requires that such a voice communication system be provided in the building, and
(c) doors to suites and sleeping rooms not within suites in the retirement home, other than doors leading directly to the exterior, shall be equipped with self-closing devices.
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OBC Div. B 11.3.4.1. Extension, Material Alteration or Repair
(1)Despite Subsections 11.3.1. to 11.3.3., when an existing building is extended or subject to material alteration or repair, Part 7 applies,
(a)to the design and construction of plumbing in the extensions and those parts of the building subject to material alteration and repair, and
(b)to plumbing which is adversely affected by the extension, alteration or repair.
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OBC Div. B 11.4.1.1. Performance Level
(1)The performance level of a building after construction shall not be less than the performance level of the building prior to construction.
(2)For the purposes of Sentence (1), reduction of performance level shall be determined in accordance with Subsection 11.4.2.
(3)Where the proposed construction would reduce the performance level of an existing building, compensating construction shall be required in conformance with Subsection 11.4.3.
(4)For the purpose of this Subsection, where a permit to construct a farm building has been applied for before January 1, 2025, the performance level of the farm building is permitted to be evaluated based on the applicable requirements of Ontario Regulation 332/12 (Building Code) made under the Act, as it read on December 31, 2024.
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OBC Div. B 11.4.3.1. General
(1)Where the performance level of an existing building is reduced under Subsection 11.4.2., compensating construction shall be carried out in accordance with this Subsection.
(2)Except as provided in Sentence (3), compensating construction required under this Subsection applies to the part of the building being altered and shall include,
(a)fire separations, with the required fire-resistance ratings, separating the part being altered from the floor areas immediately above and below and from the immediate adjacent areas, and
(b)access to exits and exits from the building, where the alteration adversely affects the exit system of the building.
(3)Compensating construction required under this Subsection applies to the existing building systems that are adversely affected by the proposed construction.
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OBC Div. B 11.5.1.1. Compliance Alternatives
(1)A compliance alternative shown in Table 11.5.1.1.-A, 11.5.1.1.-B, 11.5.1.1.-C, 11.5.1.1.-D/E or 11.5.1.1.-F may be substituted for a requirement contained in Part 3, 4, 6 or 8 where the chief building official is satisfied that compliance with the requirement is impracticable because,
(a)of structural or construction difficulties, or
(b)it is detrimental to the preservation of a heritage building.
(2)A compliance alternative shown in Table 11.5.1.1.-A, 11.5.1.1.-B, 11.5.1.1.-C, 11.5.1.1.-D/E or 11.5.1.1.-F may be substituted for a requirement contained in Part 9 or 12 without satisfying the chief building official that compliance with the requirement is impracticable.
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