Question 1

Do I need a permit?

Accepted Answer

Yes. A garden suite is a dwelling. We handle the application, site plan, and grading plan.

Question 2

Do I need a designer if I use a pre-approved plan?

Accepted Answer

Not for the building design. You still need a professional for the site plan and the grading / drainage plan.

Question 3

Can I rent it out?

Accepted Answer

Ontario rules allow additional residential units, such as a garden or laneway suite, to be a separate dwelling, and secondary units can be permitted under the Planning Act. Registration, licensing and occupancy rules vary by municipality, so check with your city before anyone moves in.

Question 4

How long does it take?

Accepted Answer

Modular path typically 5–8 months. Full custom typically 9–14 months. Permit comments and trees add time.

Question 5

What if I am in Oakville, Brampton, or Burlington?

Accepted Answer

We build there. Those cities do not have an instant zone-code lookup on our site. Start the same feasibility form and skip the instant map, or book the site assessment.

Question 6

What will it cost?

Accepted Answer

It depends on the lot. Zoning, servicing, trees and finish level set the number, and we price your property after feasibility. For scale only, we illustrate a one-bed turnkey around $310,000 — illustrative, not a quote.

Question 7

Who is the best garden suite builder in Mississauga?

Accepted Answer

"Best" depends on the lot. Look for a team that runs zoning and fire access before finishes, can deliver Mississauga’s pre-approved 430/600 plans turnkey, and handles the permit file end-to-end. That is Modular X’s process — start with the lot check (/feasibility).

Question 8

Do you use Mississauga’s free pre-approved garden suite plans?

Accepted Answer

Yes. The City publishes a studio at 430 sq ft and a one-bedroom at 600 sq ft. Finishes can change. Walls, doors, windows, and room locations cannot, or you leave the pre-approved path. You still need a site plan and a grading plan. Drawings are on the plans page.

Question 9

Does Mississauga refund the garden suite building permit fee?

Accepted Answer

Eligible ARUs get the building permit fee refunded after construction and final inspections. Confirm the current City program at application. Walkthrough: Mississauga garden suite permits (/guides/mississauga-garden-suite-permits).

Question 10

How is Modular X different from other Mississauga garden suite companies?

Accepted Answer

Lot-first feasibility (instant zone for Mississauga), City catalogue plans when they fit, permits run by us, and build as full custom or modular crane-in. We do not caption stock photos as completed Modular X jobs.

Question 11

Does a basement apartment block a garden suite in Mississauga?

Accepted Answer

No. On most serviced lots the house plus two additional residential units is allowed as-of-right, and a garden suite is one of those units. A basement apartment does not by itself stop a detached suite. One garden suite per lot. The lot check still has to clear setbacks, the fire path, trees, and servicing.

Question 12

How do I apply for a Mississauga garden suite permit in ePlans?

Accepted Answer

The building permit goes in online through the City's ePlans portal. With a pre-approved model you do not upload the City's drawings; you enter the model type in the description of the proposed work. The file needs the site and grading plans, the Applicable Law Form, and the Application to Register a Second Unit if it applies. A complete file gets its first review in about 15 business days. A resubmission can add two weeks or more. We prepare and file it.

Question 13

Can a Mississauga garden suite share the house's water and sewer?

Accepted Answer

Yes, or it can have its own. The City lets a garden suite share water and wastewater connections with the main house or connect separately. A separate connection needs approval from the Region of Peel. A shared one needs a Water Service Pipe Sizing Form with the permit application, to show the existing water service from the street is big enough. We measure the servicing run at the lot check.

Question 14

Which Mississauga by-law rules apply to a garden suite?

Accepted Answer

Mississauga's Zoning By-law sets the garden suite rules (the City publishes its garden suite zoning regulations as By-law 0174-2023): maximum height and size, setbacks from property lines, limits on window openings, and an unobstructed hard-surfaced fire access path at least 1.2 metres wide and 2.1 metres high, no more than 45 metres from the edge of the street to the garden suite door. On townhouse lots, garden suites are limited to corner or through lots in the RM5 and RM6 zones and are not permitted in standard condominium townhouses. Heritage properties may need Heritage Advisory Committee review. We check the by-law against your survey at /feasibility.

Question 15

What fees apply to a Mississauga garden suite?

Accepted Answer

Building permit fees depend on the size and type of unit and are calculated when the City pre-screens your request, using its fee schedule. A garden suite also has a new-address fee of $81.90 plus HST. The City states second and third additional residential units are exempt from most municipal charges, and that development charges also apply for additions and garden suites — so confirm the charges for your file at pre-screen. If your permit is to build or legalize an ARU, the building permit fee is refunded automatically after construction and all inspections are complete. Source: City of Mississauga, Additional residential units.

Model	Size	What it is
Studio	430 sq ft / 40 m²	Open living, kitchen, sleeping zone + 3-piece bath
One-bedroom	600 sq ft / 55 m²	Separate bedroom, full kitchen, living, 3-piece bath

Garden suite Mississauga. Built from the lot out.

Garden suite Mississauga: the lot rules come before the finishes

What you can actually build here

The lot rules that stop a build

Instant zoning, then a real lot check

Two ways to build

What it costs (illustrative)

Permits, without the theatre

Who this is for

FAQ