Garden Suites · Mississauga, Peel Region
Garden suites for Mississauga backyards: the one detached unit a lot may hold, placed around protected trees, conservation mapping and the setbacks in Mississauga Zoning By-law 0225-2007. We design the suite in Richmond Hill, file it through ePlans with the City of Mississauga Planning and Building Department and build it, for family or for rent.
What’s included
A garden suite is a small new house with all of a house’s rules, on a lot that already has one. The zoning check comes first, because it decides whether there is a suite at all. In Mississauga the package goes to the City of Mississauga Planning and Building Department, and it is drawn to that department’s checklist.
Before anything is drawn
Lot size, setbacks, height, coverage, tree protection and servicing, checked against the by-law to confirm what fits.
The design
Layouts that get living space out of a small footprint, with a second storey where the by-law allows it.
Built to stand alone
Foundation, framing and roof designed by our P.Eng for a building with no neighbour to lean on.
Move-in condition
Kitchen, bathroom, heating and finishes chosen for a unit that will be rented or lived in by family for years.
The package
Find your situation below. If it’s there, this is the service, and the card underneath is everything you get from our one office.
05 common situations
07
items in your package, all from one P.Eng and BCIN team.
Drawn & stamped in-house
How it runs
Four steps, starting with the one that decides everything else: whether the lot allows a suite at all.
We measure the lot against the by-law and tell you the largest suite that fits, or that one does not, before you spend on design.
Plans, structure, mechanical and site drawings from one office, filed with the city and answered until the permit is issued.
Excavation and foundation, framing, rough-ins, exterior and finishes by our crew, inspected at each stage.
Water, sewer and electrical connected, the final inspection passed, and the unit ready to rent or move into.
Case files
Open any file for the scope, the disciplines involved, what we delivered and what the owner came away with.
A compact two-storey suite in a Toronto backyard. Architectural and structural drawings, zoning review and a framing package that makes every square foot count.
Delivered
New living space on a lot the owners already had.
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Structural walls came out and rooms were added to open the plan. Beam and column design, permit drawings and renovation coordination through to final inspection.
Delivered
An open layout where the load-bearing walls used to be.
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A code-compliant second unit with its own entrance, fire separations between the units, HVAC design and the full permit package.
Delivered
A legal second unit that brings in rent and adds property value.
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A new build taken from the client’s sketch to occupancy, with the architectural, structural and mechanical design done by one team.
Delivered
Built to the client’s own plan, with one team answering for every discipline.
Start a project like thisA two-storey garden suite laid out to get the most usable space from the footprint, designed and permitted as a rentable unit.
Delivered
Rental income and a higher property value.
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A dental office converted into a supermarket. Interior renovation, a new plumbing system and fire separations upgraded to the Ontario Fire Code.
Delivered
A dental office reopened as a supermarket, compliant with the Ontario Fire Code.
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A custom covered porch that turns the front of the house into usable outdoor space. Addition design and structural drawings for the permit.
Delivered
More usable outdoor space and added home value.
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Site grading to manage drainage and prepare the land for a new driveway, drawn as a grading plan for the site alteration permit.
Delivered
Drainage handled and the land ready for a new driveway.
Start a project like thisPhoto plates
Additions, basements, kitchens, new builds and commercial fit-outs. Drag a row to scrub through it, or open any photo full size.Tap any photo to see it full size.
21 platesResidential, commercial & new build
The drawing set
Framing schedules, wall assemblies, dimensions and a city review stamp, as issued. Client title blocks are trimmed off to protect the people we drew them for.
Drawing set
Sheets in this set
Sheet title
Existing basement plan
The existing house recorded before any design: beams, joists and bearing walls.
Drawing no.
2 of 5
Service area
From the office we cover the whole GTA, north to Barrie and Orillia, east to Peterborough and Cobourg, west to Kitchener and Brantford, and down through Niagara.
46 across 8 regions
York Region
Toronto & Peel
Halton
Durham
Simcoe & Dufferin
Waterloo, Wellington & Brant
Hamilton, Niagara & Haldimand
Kawarthas & Northumberland
Past the 90-minute line
We've also completed projects in London and Strathroy. Farther out than that? Call (416) 990-9179 and ask.
Permits filed with municipalities including
Before you call
Anything we haven’t answered here, we’ll answer on a call. The first consultation is free.
(416) 990-9179To Mississauga. The application goes to the City of Mississauga Planning and Building Department, not Peel Region, as a new building on your lot with a drawing set of its own. Mississauga’s Lot Grading and Municipal Services Protection By-law governs grade changes, and residential grading plans are reviewed before the building permit is issued. A suite’s grading plan has to clear that review before its permit can be issued too, so we submit the plan with the drawings rather than after them. We draw the suite, file it and answer the examiner’s comments until the permit is issued.
Most of Mississauga is under Credit Valley Conservation (CVC). Eastern Mississauga along Etobicoke Creek is under the Toronto and Region Conservation Authority. Whichever covers the lot, a permit is needed only inside that authority’s regulated area. Ontario’s rules bar development within 30 metres of a wetland without one, and along the TRCA side the permit has to be in hand before the building permit is issued. We read both authorities’ mapping against the survey.
In Mississauga, owners of a detached, semi-detached or town home can build up to two additional residential units: either two inside the home, or one inside the home plus one detached garden suite. Only one garden suite is allowed per lot. For townhouses, garden suites are limited to corner or through lots, and additional units are not permitted in standard condominium townhouses.
Yes, at 15 cm across or more. Mississauga’s Private Tree Protection By-law 0021-2022 requires a permit to injure or remove any tree on private property that is 15 cm (6 inches) or more in diameter, including dead or dying trees.
Yes. We take on garden suites across Mississauga, including Port Credit and Streetsville, within an hour of our Richmond Hill office. The first consultation is free, by phone or on site.
Three things to start: property address and a survey, if you have one; whether the suite is for family or rent; and photos of the backyard and the side-yard access. Send those and we tell you what the City of Mississauga Planning and Building Department will ask for before we quote.
Being in a district adds a check before the permit. If your lot is in Meadowvale Village, Old Port Credit Village or Streetsville, the suite is new construction inside a district designated under Part V of the Ontario Heritage Act. We ask the City of Mississauga what that district expects of a backyard building before its height, roof and cladding are settled, then file the permit set with the Planning and Building Department on that design.
Online, through ePlans. We upload the full set there: the site plan with setbacks and trees, the grading, floor plans, structure, and the water, sewer and power runs back to the house. You can follow the file under Project info in the same system while the Planning and Building Department reviews it.
Yes. Under O. Reg. 299/19 anyone may live in an additional unit, related to you or not, and whether or not the person living there owns the lot, and in Mississauga a garden suite is one of the lot’s two additional units. We plan it for a tenant from the first drawing, and the Planning and Building Department reviews it as a dwelling unit whoever ends up living there.
Inspectors from the City of Mississauga Planning and Building Department, at the stages the permit lists, since Peel Region has no role in a permit for a house lot. Our crew calls each inspection in as the suite reaches it, and the permit is closed once the final one passes.
Searched & answered
Short answers to the garden suites questions people search most, and the broader topics they lead to.
Not covered here? Book a free consultationYes. Mississauga allows a detached garden suite on a house lot, built under a building permit from the City of Mississauga Planning and Building Department. Whether a given lot qualifies depends on its house type and where the lot sits, and Fine Engineering confirms that from the survey.
A garden suite is a self-contained home in the backyard of a house, detached from the main building, with its own kitchen, bathroom and entrance. Local by-laws set its size, setbacks and height, and those rules differ from one municipality to the next. Fine Engineering measures a lot against them at the start of every garden suite project.
There is no single figure. A garden suite is priced like a small house, and the lot then moves the total up or down through the length of the service run from the house and how easily machines can reach the yard. Fine Engineering prices each suite from a written scope after the zoning check, and the first consultation is free.
Most often because water crosses a property line, the ground slopes too gently away from the house, or the swales and elevations do not tie into the survey. Reviewers also return plans that lack erosion control, or an engineer’s stamp where one is required. Fine Engineering designs grading to each municipality’s own criteria and revises the plan to answer the reviewer’s comments.
Within limits the municipality sets. Its lot grading criteria give a minimum slope, so water runs away from the house, and a maximum, beyond which the change in level needs a retaining wall. The figures differ from one municipality to the next, so a plan follows the local criteria rather than a rule of thumb. Fine Engineering sets the slopes and any walls in one design.
The measures that keep soil on a site during construction: silt fence along the boundaries, a mud mat at the driveway, protection over catch basins and cover on stockpiles. Municipalities often make them a condition of a grading or site alteration approval and inspect for them. Fine Engineering puts erosion and sediment control on every grading plan it draws.
Good to know
In Mississauga the reviewer is the City of Mississauga Planning and Building Department. Every Mississauga lot sets its own terms: rear-yard depth, setbacks, height limits, tree protection and the route for water, sewer and power decide whether a suite fits.
We walk the site with the survey on a scheduled visit before anything is drawn, then file the garden suites package to the City of Mississauga Planning and Building Department’s own checklist.
Mississauga’s housing takes in historic village cores at Port Credit and Streetsville within 1960s to 1990s suburban neighbourhoods, with teardown rebuilds on older lots. In the old village cores a suite goes up beside an older house, so we check early whether the property has heritage status. On a teardown lot the suite can be planned with the new house, and the grading set once for both.
Height, distance from each lot line and the share of the lot covered by buildings all come from the standards for your zone in Mississauga Zoning By-law 0225-2007. The by-law has been amended many times since 2007, so we read the current consolidation against your survey rather than a summary.
O. Reg. 299/19 adds two rules: buildings may cover up to 45 per cent of a lot with additional units even where the by-law sets less, and the suite must stand at least 4 m from the house unless the by-law permits it closer. Since November 21, 2025, Ontario also reads minimum setbacks at 90 per cent on urban residential land outside the Greenbelt and some prescribed areas. If your lot qualifies, our site plan in ePlans uses it.
On a Mississauga townhouse lot, the survey answers the first question: whether the lot is a corner lot with frontage on two streets or a through lot that runs from one street to another. Those are the only townhouse lots where the city allows a garden suite, and an interior lot in the row is limited to units inside the house.
Ownership is the second question. A standard condominium townhouse is outside Mississauga’s additional unit rules altogether, so neither a suite nor a basement unit is possible there, and we check how the property is held before anything is drawn for the Planning and Building Department.
Contact us
Send us the address and we’ll tell you whether a suite fits the lot, on a free first call.
First consultation free(416) 990-9179