A garage suite is a self-contained dwelling built above or attached to a detached garage — Edmonton’s dominant form of backyard housing. Under Zoning Bylaw 20001, Edmonton now regulates these as “Backyard Housing,” capping site coverage at 20%, height at 6.8 m, and the second storey at 60 m² per dwelling. Note that 60 m² limits the upper floor, not the whole unit.
- Edmonton’s current bylaw term is “Backyard Housing” — previously garage suites and garden suites
- Maximum site coverage 20%; maximum height 6.8 m; second-storey floor area 60 m² per dwelling
- The 60 m² is a second-storey cap — widely misreported as a total floor area limit
- Rises to 70 m² where the building meets the bylaw’s Inclusive Design requirements
- Backyard housing cannot be subdivided from the principal dwelling or form part of a bare land condominium
Most Canadian cities build their backyard homes on a foundation in the rear yard. Edmonton builds them over the garage — a form well suited to a city with alleys, cold winters and a genuine need to keep the parking.
Edmonton is also, quietly, the most permissive big city in Canada for adding homes to a residential lot. Most Edmonton homeowners have no idea how much their own zoning already allows.
What is a garage suite?
A garage suite is a self-contained dwelling unit built above, or attached to, a detached garage in the rear yard of a residential lot. It has its own kitchen, bathroom, sleeping area and entrance, and it can be occupied year-round independently of the main house.
The appeal is efficient: you keep the parking, you use land that was already built on, and the unit sits above grade with real windows — which makes it a considerably more attractive rental than a basement suite of the same size.
One terminology update that matters. Edmonton’s current Zoning Bylaw 20001 regulates these under the heading “Backyard Housing” — defined as a building containing one or more dwellings located wholly within the rear yard. That single category now covers what the City previously called garage suites and garden suites. If you search “garage suite Edmonton” you’ll still find plenty, but the bylaw section you actually need is Backyard Housing.
Garage suite vs garden suite vs laneway house
Same idea, three words, three cities:
| Term | Where it’s used | Distinguishing feature |
|---|---|---|
| Garage suite | Edmonton | Built above or attached to a garage |
| Garden suite | Toronto, Mississauga, Brampton | Rear yard, no lane required |
| Laneway house / suite | Vancouver, Burnaby, Coquitlam, Toronto | Accessed from a public lane |
| Coach house | Surrey, Ottawa | Detached rear-yard dwelling |
In Edmonton the practical distinction between a garage suite and a garden suite is simply whether there’s a garage under it — and the bylaw treats both as backyard housing with the same dimensional rules. Elsewhere the words carry genuinely different regulations, particularly in Toronto where the presence or absence of a lane puts you in two separate rulebooks.
Edmonton’s rules
Under Section 6.10 Backyard Housing of Zoning Bylaw 20001, backyard housing must comply with:
| Regulation | Value |
|---|---|
| Maximum height | 6.8 m |
| Maximum height where the rear lot line abuts a residential site with a height limit of 12.0 m or less | 4.3 m |
| Maximum site coverage | 20% |
| Maximum second storey floor area per dwelling | 60.0 m² |
| Second-storey floor area with Inclusive Design (s. 5.50) | 70.0 m² |
| Maximum length of any second-storey building wall | 15.0 m |
| Minimum setback | 1.2 m |
| Minimum rear setback abutting an alley, no garage door facing it | 0.6 m |
| Minimum distance to other principal buildings on the site | 3.0 m |
| Minimum distance between backyard housing buildings on the site | 0.9 m |
Read the 60 m² carefully. It caps the second storey, not the whole unit. This figure is repeatedly reported online as a total floor area limit, which would make the building sound far smaller than the bylaw permits. A garage suite’s ground level is the garage; the 60 m² governs the living space above it.
Two more provisions worth knowing:
- Backyard housing must not be subdivided from the other principal dwellings on the site, or form part of a bare land condominium. That settles the “can I sell it separately” question for Edmonton definitively — you can’t.
- A main entrance separate from the garage door is required, along with a covered entrance feature. Facades must be articulated using two or more design techniques.
Above all this sits the RS (Small Scale Residential) zone, which permits up to eight dwelling units on a sufficiently large mid-block lot — roughly 75 m² of site area per unit, meaning about 600 m² for the full eight. More than eight is limited to corner sites. That’s among the most permissive small-lot regimes in Canada.
What a garage suite costs
We don’t publish a figure — the range between building over an existing sound garage and building new from the ground is too wide.
What drives it:
- Whether the existing garage can carry it. See the next section; this is the biggest single variable.
- Servicing distance. Water, sanitary sewer and electrical have to reach the rear yard. Where they don’t, trenching the depth of the lot is often the largest line item.
- The stair and entrance. A separate main entrance, covered, plus compliant stair geometry to the upper floor.
- Height constraints. If your rear lot line abuts a site limited to 12 m or less, your maximum height drops to 4.3 m — which can rule out a two-storey design entirely.
- Winter construction. Edmonton’s build season affects scheduling and cost.
The genuine Alberta advantage. Alberta has no provincial sales tax — B.C. charges 7% PST on many construction inputs — and none of the Ontario-style per-unit development charges that make adding a unit in the GTA so expensive. On a backyard build, that structural difference is worth more than any grant programme, and it’s the main reason Edmonton projects pencil where equivalent Ontario ones struggle.
On grants, be accurate: Edmonton’s secondary suites page lists no municipal suite grant. Alberta’s SHARP is a seniors’ home-equity loan for their own residence and RAMP is an accessibility grant — neither funds a rental suite. The federal $80,000 loan was cancelled.
Can you build one over an existing garage?
Sometimes — and this is where budgets go wrong, so be sceptical of an easy yes.
A typical detached garage was built to shelter a vehicle. It has a shallow, unheated slab, minimal footings, and framing sized for a roof rather than an occupied floor above. Adding a dwelling on top means:
- Foundation. The existing slab and footings usually cannot carry a heated, occupied storey through Edmonton frost cycles. Replacement is common, and once you’re replacing the foundation, much of the “saving” from reusing the garage has gone.
- Structural framing. Walls and any existing floor structure typically need reinforcement for the new loads plus insulation weight.
- Building envelope. The garage level and the suite above need appropriate separation and insulation.
- Fire separation between the garage and the dwelling above.
- Servicing run to the building.
The honest comparison to run: price the conversion against a purpose-built new backyard housing structure. Where the foundation has to be replaced anyway, new construction often produces a better unit — better layout, better insulation, no compromises inherited from the garage’s geometry — for a similar figure. Get a structural assessment before committing to either.
Permits and the Edmonton process
Two approvals, and they’re sequential:
Development permit — confirms the proposal complies with the zoning bylaw: use, height, site coverage, floor area, setbacks and design requirements.
Building permit — confirms the construction meets the National Building Code – Alberta Edition. Electrical and plumbing permits are separate.
Practical notes:
- Check your zoning first. Edmonton’s mapping tools let you look up your property’s zone before doing anything else, and the City publishes open data that’s queryable by address — worth using before you pay anyone for drawings.
- Confirm your height limit specifically. The 4.3 m reduction where the rear lot line abuts a lower-height residential site is easy to miss and it changes the whole design.
- Design for the Inclusive Design provisions if you want the 70 m² second storey rather than 60 m². That’s a decision made at the drawing stage.
Our Edmonton building guide covers the process in detail, and our zoning and bylaws guide covers what’s being assessed.
Find out what your Edmonton rear yard allows
Edmonton’s rules are unusually generous, and most homeowners underestimate what their own lot already permits. What decides it is site coverage, your rear lot line’s neighbouring height limit, and how far servicing has to travel.
HouseLyft’s free property assessment works those out for your address. Request your free report.
This guide explains Edmonton’s zoning provisions in general terms and is not legal advice. Bylaw 20001 is amended periodically and provisions apply lot by lot — confirm the current bylaw and your property’s specific zoning with the City of Edmonton before committing to a project.
Checked by Lee Yousaf, Founder