KitchenerBuilding PermitsAdditional Residential Units

Adding a Second Unit in an Existing House Guide to Successful Inspections

Published by City of Kitchener

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This is the City of Kitchener’s document, as published on its website on 23 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice

Type: Guide
Published by: City of Kitchener
Date: December 2022 revised June 2025
Also called: guide to a successful inspection - duplex
For: contractor
Building types: All building types
Pages: 34
Agencies: Electrical Safety Authority
Instruments: Ontario Building Code · CAN/ULC-S115

Overview

The City of Kitchener's 34-page guide to successful inspections when adding a second unit to an existing house, linked from its additional dwelling units page for duplexes. It sets out the typical inspection stages, then construction detail on fire separations, sound control, fire doors, fire stopping, smoke and CO alarms, basement windows, egress windows, entrances, plumbing, HVAC and insulation, with a disclaimer that it does not replace the Ontario Building Code.

What it covers

Prior to Construction
Typical Inspections
Fire Separations and Sound Control
Sound Control
Fire Doors
Fire Stopping
Continuity of the Fire Separation
Access Panels
Service Rooms
Sprinkler Systems
Smoke Alarms
CO Alarms
Structural
Egress Window VS. Escape Window
Main Entrance Requirements
Plumbing
HVAC
Insulation
Ready for Success

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