Basement unit permit drawings

Role: Architectural designer
Year: 2026
Location: Ontario

A permit drawing set for a basement secondary unit in a residential renovation in Ontario. The set includes the basement plan at 1:50, the south elevation, fire separation assemblies, an exterior stair and egress detail, and a section.

The drawings were coordinated with the Ontario Building Code.

Fire separation: Two wall types are detailed: a fire separation for the mechanical room, and a 30-minute separation between the secondary unit and the shared exit.
Windows and egress: The south elevation calls for an existing window to be replaced with a fixed, fire-rated assembly, and shows a new egress window and exterior stair.

Basement plan drawing of a secondary unit with mechanical room, shared exit, living room and bedroom, with dimensions. — Basement plan, scale 1:50

South elevation of a two-storey house with horizontal vinyl siding, a side entrance and exterior stair, and a new egress window below grade, with level dimensions and notes. — South elevation, scale 1:100

Sheet of construction details: two fire separation wall assemblies, an exterior stair and egress detail, and a building section. — Fire separation assemblies, exterior stair and egress detail, and section A-A

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