Accessory Dwelling Units

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Accessory Dwelling Units (ADUs) help create a variety of housing options within our community, including the supply of rental housing. Effective ADU planning considers accessibility, sustainability, and neighbourhood character into their designs. ADUs include Carriage Houses and Garden Suites.

Zoning Regulations:

An accessory dwelling unit (ADU) is a small, stand-alone house located on an existing lot with the main house. An ADU can have one or two storeys and can be above a detached garage. ADUs must meet the zoning regulations and building code, and they must receive a building permit before construction.

ADUs are permitted in the back yard or side yard of the following zones:

  • R-1 Single-Family Residential 
  • R-2 Two-Family Residential * only on lots with a Single-Family Dwelling
  • RR-1 Rural Residential
  • R-8 South Lakeside Residential
  • A-1 Acreage Reserve

Refer to the Zoning Bylaw 1825, 2002 for all regulations

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Steps to Develop an Accessory Dwelling Unit

Check your property's zoning to find out what type of ADU you can build.


1.) If you are the owner contact Development Services before you start construction at 250-392-1765 | Email: development@williamslake.ca.

2.) Read the Accessory Dwelling Unit: How-to Guide

3.) Apply for a building permit: Building Permit Application

4.) Apply for an accommodation business license, if you own a rental property with:

  • Two units and you do not live in one of the units, or
  • More than two units


Other Considerations

  • Consider servicing requirements, such as electrical, water and sewer
  • Are you ready to be a landlord? Learn about your rights and responsibilities to a tenant in the Residential Tenancy Act.


Important Links and Documents

Accessory Dwelling Unit How-to Guide:

The City has compiled a user-friendly guide to walk residents through the process of building an ADU. Please read the following document for a step-by-step guide if you are considering constructing an ADU: