Secondary Suite Permits in Calgary: What Every Homeowner Needs to Know

Building or legalizing a secondary suite in Calgary requires navigating the City's permit system — and skipping any step creates real problems down the road. Whether you're building a new suite or trying to legalize an existing one, this guide covers the permit process clearly, including the 2026 amnesty program that can save you money if you move before the deadline.

What Is a Secondary Suite?

In Calgary, a secondary suite is a self-contained dwelling unit located within a single detached home, containing its own sleeping area, bathroom, and kitchen or cooking facilities. It's sometimes called a basement suite, in-law suite, or granny suite. Calgary also permits garden suites and garage suites, which are separate structures on the same property — these have different permit requirements.

Only one secondary suite is permitted per property. It must be within the main residential structure, not in a detached garage (that's a garage suite, different rules).

Do You Need a Development Permit?

Whether you need a development permit depends on your property's land use district:

• Permitted Use: In some Calgary residential zones, a secondary suite is a "permitted use" — meaning you still need a building permit, but the development permit process is significantly streamlined or not required in the traditional discretionary review sense.
• Discretionary Use: In many zones, a secondary suite is "discretionary" — a full development permit application is required, including a site plan, and it goes through City review. This can take 60–90 days.

Check your property's land use district on the City of Calgary's website, or ask your builder to confirm at initial consultation. Getting this wrong means submitting the wrong applications and losing weeks of time.

Development Permit Requirements

If a development permit is required, your application must include:

• A site plan showing your property boundaries, existing buildings, proposed suite entrance, and parking stall locations
• Basic floor plans showing suite layout
• Confirmation of parking compliance — one additional off-street stall (2.5m × 5.9m minimum) is required for the suite tenant
• Amenity space confirmation — minimum 7.5 m² outdoor amenity space for the suite (with no dimension smaller than 1.5m)

Building Permit Requirements

Every secondary suite construction project requires a building permit. Your building permit application to the City of Calgary must include plans showing:

• Existing basement layout and proposed suite configuration
• Fire separation assembly details (1-hour fire-rated walls and ceiling between suite and main home)
• Egress window schedule with dimensions confirming 0.35 m² minimum opening per bedroom
• Door schedule confirming solid-core, self-closing doors in shared areas
• Smoke and CO alarm interconnection plan
• Floor-to-ceiling height confirmation (minimum 1.95m)

The City reviews building permit applications within approximately 60 days. An incomplete or inconsistent application will be returned for revision, adding weeks to your timeline. Submitting a complete, code-compliant application the first time is the fastest path through the system.

Trade Permits

In addition to the building permit, most secondary suite projects require:

• Electrical permit — for new circuits, sub-panel, smoke/CO alarms
• Plumbing permit — for bathroom and kitchen rough-in
• Gas permit — if adding a gas range or independent heating
• Mechanical permit — if modifying the HVAC system

Each licensed trade (electrician, plumber, gas fitter) applies for their own permits. A general contractor or builder managing your project coordinates this so you're not chasing multiple permits independently.

The 2026 Secondary Suite Amnesty Program

Calgary's Secondary Suite Amnesty Program is running through December 31, 2026. This program allows homeowners with existing suites built before 2018 to legalize them with reduced barriers:

• No registry fees — registration with the City's Secondary Suite Registry is free under the amnesty (fees are waived)
• Secondary Suite Incentive Program — up to $10,000 toward basic safety upgrades including fire separation, smoke and CO alarms, and egress window improvements
• Simplified review for older suites that meet basic safety requirements

If you have a suite that has been operating without permits, 2026 is the year to act. After December 31, 2026, the amnesty ends — costs increase and the process becomes more complex. This is a genuine deadline that matters.

Inspections Required

Once a building permit is issued and construction begins, the City of Calgary requires inspections at specific stages. You cannot proceed past an inspection point without City approval. Key inspections include:

1. Rough framing inspection (before insulation)
2. Rough electrical inspection (before walls are closed)
3. Rough plumbing inspection
4. Insulation inspection
5. Final inspection (after all finishes)

After passing the final inspection, you register the suite with the City's Secondary Suite Registry. The Registry entry is what makes your suite legally rentable.

What Happens If You Skip Permits?

An unpermitted suite in Calgary creates several serious risks:

• Insurance voidance: Most Alberta home insurance policies won't cover losses related to unpermitted suites. If there's a fire or flood in an illegal suite, you may have no coverage.
• Resale complications: Calgary real estate agents and buyers are increasingly checking permit histories. An illegal suite must be disclosed and typically results in a lower sale price or an order to remove the suite before closing.
• Municipal orders: The City of Calgary can issue a stop-use order requiring the suite to be vacated and corrective work completed — at your expense, on their timeline.
• Tenant disputes: Tenants in an illegal suite have additional legal protections under Alberta's Residential Tenancies Act that can complicate a landlord's position.

Working With a Builder Who Knows the Process

Calgary's permit process for secondary suites is navigable, but it requires submitting the right documents, in the right format, with the right information — the first time. Builders who have completed multiple suite projects in Calgary know how the City's building department works, what reviewers look for, and how to avoid common application errors.

Custom Home Builders Ltd manages secondary suite permits in Calgary for every project we build. We prepare and submit all applications, coordinate trade permits, schedule inspections, and handle City communication throughout. Contact us to discuss your suite project or learn more about our services.