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Suites
Secondary Suites in Calgary
A suite that doesn't pass isn't a suite. It's a very expensive shed.
We visit your home, then you get a written price and a start date.
A secondary suite in Calgary is a self-contained dwelling on the same property as a house, and it is legal when it has been permitted, inspected and registered with the City. There are three kinds: a suite inside the existing basement, a suite above a detached garage, and a standalone suite in the rear yard.
Everything that decides whether yours can be built — and what it will cost — comes down to seven measurable things and one approval process. Both are below.
If your basement, garage or yard can't carry a legal suite, we'll tell you at the walkthrough — before you spend anything. We spent twenty years being the person who found out too late.
The three types
Basement, garage, or backyard — the lot usually decides.
Basement suites
Cheapest per square foot, because the structure and the services already exist.
Choose it when the basement has the ceiling height and a window big enough to become an egress window, and when the furnace room can be separated or a second furnace can be added.
Rules it out: low headroom under ducting, no way to get a separate entrance without cutting through a load-bearing wall or the foundation, and window wells that can't be enlarged because of the property line.
What makes a suite legal, and what makes one illegal.
There is no partial credit. A suite is legal when it has a permit, has passed the City's inspections, and appears on the secondary suite registry. A suite is illegal when any one of those is missing, no matter how well it was finished.
The distinction matters at three moments: when a tenant is hurt or a fire starts, when you make an insurance claim, and when you sell. In all three, the finish quality is irrelevant and the paperwork is the only thing anyone looks at.
What we check that others don't
The seven things a suite has to pass.
Ceiling height. A suite needs enough headroom in every area people use. Older Calgary bungalows often have tall enough joists. The problem is usually a duct, a beam or a pipe hanging down in exactly the spot you wanted the hallway. The City measures height to the lowest thing hanging down, not to the joists themselves. Moving a duct to gain height is a real design choice, and it costs money. It has to be in your scope before you sign anything.
Egress. Every bedroom in a suite needs an egress window — a window big enough and low enough for a person to climb out of in an emergency, leading into a window well big enough to stand in. Most existing basement windows are too small. Making one bigger means cutting into the foundation wall, which needs an engineer's detail and a permit. It's one of the first things a City inspector checks.
A separate entrance. You have to be able to reach the suite without walking through your home. In practice that means a side or rear door with its own steps, sloped so melting snow runs away from the door instead of pooling at it. Where the steps are cut below ground level, good drainage matters more than the steps themselves.
Fire separation. Fire separation means the floor and walls between the suite and the rest of the house have to hold back fire for a set amount of time. Every gap has to be sealed — around ducts, pipes, wires, behind the stairs. Most illegal suites have drywall on the ceiling but nothing sealed behind it. One unsealed hole for a pipe undoes the whole thing.
Interconnected smoke and carbon monoxide alarms. Smoke and carbon monoxide alarms in the suite and in the house have to be wired together, so when one goes off, they all go off. Separate battery-powered units in each unit don't meet the rule. This is one of the most common reasons an otherwise finished suite fails its final inspection.
Heating, ventilation and services. The suite needs its own heat source and its own ventilation, and its mechanical room has to be closed off from your furnace room. Sharing a furnace room also lets smoke and smells travel between the two units, which is the real-world reason for this rule.
Parking. Calgary's parking rule for secondary suites depends on your district and where your lot sits — some areas need an extra parking stall, some don't. It's checked at the development permit stage, and finding out late can force a redesign of a garage or backyard suite.
The approval process
How a Calgary suite gets approved and registered.
01
Confirm the land use.
Secondary suites are permitted in most Calgary residential districts. Where the proposal is a garage or backyard suite, or where relaxations are needed, a development permit comes first and neighbours may be notified.
02
Drawings and the building permit.
Floor plans, the fire separation assembly, egress dimensions, the heating and ventilation design, and the structural details for any new opening in the foundation. The permit is issued against those drawings.
03
City inspections during construction.
Framing, plumbing, electrical, heating and insulation are inspected before anything is covered. This is the part that punishes work done out of sequence, and it is why the schedule and the inspection calendar are planned together.
04
Final inspection and the registry.
After the final passes, the suite goes on the City's secondary suite registry. That entry is the thing your lender, your insurer and your eventual buyer will look for. You get the permit numbers and the registry record in your handover package.
What fails
The six failures we see most often.
- An egress window that is close but under the minimum opening, or a window well too small to turn around in.
- Ceiling height lost to a duct or beam over a hallway or a bedroom.
- Fire separation drywalled but never sealed at pipe, duct and wire penetrations.
- Smoke and CO alarms installed in both units but not interconnected.
- A shared furnace serving both units, or a mechanical room that opens directly into the suite.
- No permit history at all — work done, covered up, and discovered by the buyer's inspector at resale.
Five of the six are cheap to do right during construction and expensive to correct after drywall. The sixth — no permit at all — is only correctable by opening the work back up.
What drives the price
What moves the price on each type.
| Suite type | What moves the price | What you get for it |
|---|---|---|
| Basement suite | Ceiling height lost to ducts and beams, whether a proper egress window means cutting into the foundation, and whether the suite needs its own furnace and electrical panel. | Usually the lowest build cost of the three, because the structure, roof and services already exist and only the interior is new. |
| Garage suite | Whether the garage's existing foundation and framing can hold up a second storey, whether the lane is accessible, and how far water, sewer and power lines have to run from the house. | Costs more per square foot than a basement, rents to a different tenant, and leaves the main house untouched. |
| Backyard suite | Whether your lot is wide and deep enough under the City's yard-space rules, a brand-new foundation and full utility hookups, and whether the build is one storey with no steps. | The highest build cost of the three, and the only one that adds a separate building at grade to the property. |
Rent and payback depend on the unit, the lane and the market at the time you rent it, so no table here will tell you what yours will earn. What is worth knowing is that a registered suite counts toward mortgage qualification and an unregistered one does not — an unpermitted suite adds rent but subtracts from the sale price.
Your number is fixed in the scope document at the walkthrough, not estimated from a table.
Go deeper
The three suite pages.
- Basement suites
- Garage suites — ask at the walkthrough
- Backyard suites — ask at the walkthrough
Questions people ask before they book.
- Yes, once it is permitted, inspected and registered with the City. Secondary suites are allowed in most Calgary residential districts, so the real question McAra Design + Build answers is whether your specific space can meet ceiling height, egress, a separate entrance, fire separation, interconnected alarms, heating, ventilation and parking. Skip any one of those and the suite is unpermitted, regardless of the finishes inside it.
- Plan for the City approvals to take roughly as long as construction itself. A development permit where required, then a building permit with drawings, run in weeks, and the City schedules inspections at framing, insulation and completion. McAra Design + Build gives a completion date in the contract that accounts for that inspection schedule, with a daily credit off the final invoice if it is missed.
- Sometimes — it depends on what is behind the drywall. Egress and ceiling height decide it, because both are expensive to change and neither can be negotiated with the City. If those two work, fire separation, interconnected alarms and separate heat and ventilation are a priced scope of work. McAra Design + Build tells you which situation you're in at the walkthrough, before any drawings are commissioned.
- The suite needs its own heat source and its own ventilation, and the mechanical room has to be separated from it. On many Calgary basements that means a second furnace or a dedicated system for the suite; on others the existing plant can be reworked with separate zoning. McAra Design + Build decides this at the walkthrough with the ductwork in view, not from a floor plan alone.
- It becomes a disclosure item, a lender problem and a price reduction. Buyers cannot count rent from an unregistered suite toward mortgage qualifying, insurers treat it differently after a claim, and a buyer's inspector will find it. McAra Design + Build's founder spent twenty years being that inspector, and building it properly the first time almost always costs less than the resale discount.
- Basement suites usually pay back fastest, since the structure, roof and services already exist and only the interior is new construction. Garage and backyard suites cost more per square foot but rent higher to a different tenant and leave the main house untouched. McAra Design + Build works through all three options against your lot and lane at the walkthrough, numbers written down.
We put it in writing.
- A fixed price
- agreed before we start, and it doesn't move unless you change the scope.
- A completion date
- in the contract, not a range, not a best guess.
- A workmanship warranty
- if it fails because of how we installed it, we fix it. No argument, no invoice.
Most renovation guarantees are a paragraph of conditions. Ours is three commitments you can hold us to.
Get a free in-home quote.
We visit your home, then you get a written price and a start date.
What are you planning?
Or call Chris directly: +1 (587) 837-3113