Multi Family (Duplex) Dwellings

Multifamily (duplex) dwellings provide two separate dwelling units within one building, either side by side or stacked (up/down). New duplex construction is regulated to ensure buildings are safe, accessible, and compatible with surrounding development.

Before beginning construction, review the information on this page to ensure your project meets all requirements and that you have applied for the necessary permits.

eApply

When do you need a permit?

You need a permit for:

Construction of a new duplex
Conversion of a single-family dwelling into a duplex
Adding or altering a dwelling unit to create two self-contained units

You do not need a permit for:

Flooring, paint, or trim upgrades
Simple cosmetic improvements that don't alter structure or systems

* A development permit may also be required to confirm zoning compliance before a building permit can be issued.

How to apply?

You can apply online through eApply or in person at City Hall.

Your application should include:

Property address and description of work
Site plan showing setbacks, parking, and building placement
Floor plans for both dwelling units
Foundation and framing details
Four side exterior elevations
Cross sections and structural details
Basement plans (if applicable)
Truss layouts and manufacturer letters
Mechanical, plumbing, and electrical layouts
New home warranty or exemption confirmation

Professional or engineered drawings may be required depending on design complexity.

Permit Fees

Residential: minimum permit fee of $110.00 plus applicable Safety Codes Council levy. Fees increase based on the total construction value.
Additional fees may apply for trades (plumbing, electrical, HVAC), or re-inspections

Inspections

Inspections are required at key stages of construction, typical inspections would include:

Footing and foundation
Framing
Rouh-in (HVAC, Gas, Plumbing, Electrical)
Fire stopping
Insulation
Final

You must schedule inspections at least one business day in advance. Please schedule using the eInspections portal.

Things to know before you start

Helpful information to support homeowners and contractors in understanding key considerations, requirements, and resources for garage and shed development.

Development Approval

The first step is to obtain Development Approval. A Development Officer will review your site plan and building drawings to confirm they meet the minimum requirements of Land Use Bylaw 6300. Detached garages and sheds are considered Accessory Buildings and must follow specific requirements.

Design Considerations

Footing and foundation, framing, insulation and vapour barrier, wiring, plumbing, gas and ventilation requirements are to be completed in accordance with applicable codes.
Egress windows for bedrooms must indicate the opening type and meet minimum safety requirements.
Provide a numbered wall assembly reference from NBC-AE, Division B, Fire and Sound Resistance Tables (1 hour fire separation with a 50 Sound Transmission Class (STC) rating).
Lethbridge Fire Response Time requirements are to be addressed.
- Alternative Fire Response Time Map for colour vision deficiency.
Design requirement for Tall Walls is to be addressed.
Structural members must be specified (floor/roof/deck beams, garage door headers, basement window lintels, etc.)
Attic access locations and dimensions must be shown.
Engineered column and pad footing specifications must be provided on foundation plans for point loads in excess of 8,000 lbs. unfactored (11,600 lbs. factored).
Unprotected are calculations for glazed openings in exterior walls must be provided.
ICF block foundations require a copy of the installers certification to be submitted.
Screw piles or cast in place friction piles are to be designed by a professional engineer.
Compliance with Flashing requirements of the NBC- AE must be noted or detailed.