Garden suites in Mississauga, built from the lot out.

What you can actually build here

Mississauga publishes two free pre-approved garden suite plans. Use them and the City expedites the first review. You still need a site plan and a grading plan. The building drawings stay on file.

Finishes — siding, windows, doors, flooring — can change. Wall, door, window, and room locations cannot, or you lose the pre-approved path.

Custom is available when the lot will not take a stock plan. Same team. Longer review.

See the drawings: Pre-approved plans.

The lot rules that stop a build

These are the numbers that matter before anyone talks finishes.

• Rear setback: 1.8 m from the rear lot line
• Interior side setback: 0.6 m
• Street-facing side (corner lots): 2.5 m — a corner lot is not extra room. The flankage yard is the larger constraint.
• Fire route: 1.2 m wide × 2.1 m high, street to the suite door, no longer than 45 m
• One garden suite per lot
• Townhomes: narrower. Corner and through lots in RM5 / RM6 often work. Interior condo townhouses usually do not.

Trees, existing sheds, and a hydro or gas meter in the path kill more projects than zoning does. We check those on the lot, not from a map.

Rules change at every municipal border — our side-by-side comparison of GTA garden suite rules sets Mississauga against Toronto, Brampton, Oakville, Milton and Burlington.

Instant zoning, then a real lot check

Type a Mississauga address on the feasibility page. We pull the zone code from the City map and tell you, in plain English, whether a garden suite is on the table. No email to see that result.

The map is not the build. Setbacks, fire access, servicing, and trees still have to fit. After the zone code, we run the lot quiz and, if it still holds, a free site assessment.

Two ways to build

Same accountable team. Same finish standard.

Full custom — foundation-up on your lot. Typical 9–14 months. Best for irregular lots and a house you want the suite to match.

Modular crane-in — we pour the slab and run utilities while the unit is built on a factory floor. Typical 5–8 months. One crane day. Less weather risk.

We do not pass stock photos off as completed Modular X jobs. Factory and jobsite footage is the record.

What it costs (illustrative)

A typical one-bed turnkey, including permits, is illustrated around $310,000. That is not a quote. Lot, servicing, trees, and finish level move the number.

Mississauga's ARU program refunds building permit fees after construction and final inspections. Second and third units are exempt from most municipal charges. You still pay the new-address fee (about $82 + HST) and some development charges. Confirm current fees on the City schedule at application.

We do not publish rent projections. We run your lot's actual numbers at feasibility.

More range: How much a garden suite costs in Mississauga (2026).

Permits, without the theatre

1. Zoning and lot check
2. Pre-approved model or custom
3. Site plan + grading / drainage
4. Building permit in ePlans (reference the model; do not re-upload the City drawings)
5. First review: about 15 business days on a complete file
6. Fees at issuance — permit fee refunded after final inspection
7. Inspections through occupancy (building, HVAC, plumbing, ESA)

Incomplete files come back about two weeks per cycle. A clean site and grading package is the schedule.

Step-by-step: Mississauga garden suite permits (2026).

Who this is for

Homeowners in Port Credit, Lakeview, Clarkson, Lorne Park, Cooksville, Streetsville, Meadowvale, Erin Mills, and the rest of Mississauga who want a legal second dwelling — rental, parents, or adult kids — and want one team from the lot check to keys.

We do not build laneway suites in Mississauga. That product is Toronto, on a public lane. If you are in Etobicoke, use the Toronto laneway page. For city-wide Toronto garden rules: garden suites in Toronto. Also see our services and modular vs site-built.

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