11.3.

(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.

(1) Except as provided in Article 11.3.3.1.v1 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.

(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.

(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, the structural adequacy or create an unhealthy environment in the building.

(2) Construction in respect of a hotel may only be carried out in accordance with Sentence (1) provided that the construction will be in conformance with Part 9 of Division B of the Fire Code made under the Fire Protection and Prevention Act, 1997.

(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, or floor 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) the existing interior walls or floor assemblies within the suite are substantially removed in an existing building,

(b) new interior walls or floor assemblies are installed,

(c) the suite has an area greater than 300 m², and

(d) the suite is located on,

(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.

(1) Notwithstanding 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.

(1) Notwithstanding Subsections 11.3.1. to 11.3.3., where an existing septic tank is subject to material alteration, repair or replacement, the construction of the septic tank shall comply with Part 8.