NBC Group C

This tool helps determine construction requirements for Group C occupancies (Residential) per NBC 2020 Division B 3.2.2. Final compliance must be verified by a qualified professional.

Building Configuration

Building Type

Number of Storeys

Building Area (m²)

Sprinkler System Installed?

Construction Type

Street Frontage

Special Conditions

Reference Tables

Rule	Storeys	Sprinklered	Max Area (m²)	Construction	Reference

Rule	Noncombustible	Combustible	Mixed	Mass Timber
Any Height
Up to 12 Storeys
Up to 6 Storeys
Up to 3 Storeys

Rule	Floors	Mezzanines	Roof	Walls
Any Height	2 hr (1 hr within dwelling units)	1 hr	N/A	Match supported
Up to 12 Storeys	2 hr (1 hr within dwelling units)	1 hr	N/A	Match supported
Up to 6 Storeys	1 hr (45 min if combustible)	1 hr (45 min if combustible)	1 hr (special for height >25m)	Match supported
Up to 3 Storeys	1 hr (45 min if combustible)	1 hr (45 min if combustible)	1 hr	Match supported

NBC Group C

Building Configuration

Compliance Results

Reference Tables