Division B
Acceptable Solutions
Part 9 — Housing and Small Buildings
Section 9.37. 
Secondary Suites and Lock-off Units
9.37.1. General
9.37.1.1. Application
1) This Section applies to the construction of a secondary suite or a lock-off unit within a one-family dwelling; the construction of a secondary suite or a lock-off unit within one or both of the dwelling units in a two-family dwelling; or the construction of a lock-off unit within a residential suite in an apartment building. (See Part 11 for the application of secondary suites or lock-off units to existing buildings)
9.37.1.2. Deleted
9.37.2. Deleted
9.37.3. One-Family Dwelling with a Secondary Suite or Lock-off Unit
9.37.3.1. Specific Requirements
1) In addition to the requirements of this Part, a one-family dwelling with secondary suite or a lock-off unit shall be constructed in conformance with
a) the fire compartmentation requirements in Sentence 9.10.9.14.(1),
b) the installation of smoke alarms in Subsection 9.10.19., and
c) the installation of electrical facilities in Subsection 9.34.1.
2) The location of gas shut off valves controlling the flow of gas to appliances in a
one-family dwelling with secondary suite or a lock-off unit shall be readily accessible to all occupants having access to the appliances served by such valves.
3) A one-family dwelling with secondary suite or a lock-off unit may be classified, for the purposes of this By-law, as a one-family dwelling if the building is constructed in conformance with the requirements of Sentences (1) and (2) or converted in conformance with the requirements of Subsection 11.4.3.
9.37.4. Two-Family Dwelling with a Secondary Suite or Lock-off Unit
9.37.4.1. Specific Requirements
1) In addition to the requirements of this Part, a two-family dwelling with a secondary suite or a lock-off unit in each dwelling unit or a secondary suite or a lock-off unit in one of the dwelling units shall be
a) sprinklered to NFPA 13D if no part of a dwelling unit or its secondary suite or lock-off unit is constructed over another dwelling unit or its secondary suite or lock-off unit, or
b) sprinklered to NFPA 13R if any part of a dwelling unit or its secondary suite or lock-off unit is constructed over another dwelling unit or its secondary suite or lock-off unit,
2) Each dwelling unit and its secondary suite or lock-off unit shall be separated from an adjoining dwelling unit and its secondary suite or lock-off unit by
a) a fire separation with a 1 h fire resistance rating, and
b) a sound transmission classification (STC) of 50.
3) Each dwelling unit and its secondary suite or lock-off unit shall be separated from each other by
a) a fire separation complying with Sentence 9.10.9.14.(1), and
b) tightly fitted building service penetrations.
9.37.5. Residential Suites in an Apartment Building with a Lock-off Unit
9.37.5.1. Specific Requirements
1) In addition to the requirements of this By-law, a lock-off unit in a residential suite in an apartment building shall be separated from the remainder of the building by
a) a fire separation with a 1 h fire-resistance rating, and
b) a sound transmission classification (STC) of 50 or 55 where the lock-off unit adjoins an elevator.
2) Lock-off units are not permitted to be constructed within an existing residential apartment building.