Could Your Backyard Make Room for Another Home?
A garden suite could give an adult child, a parent, or a tenant a separate place to live while you keep your main house. Each household gets its own door, kitchen, and bathroom, and the suite can change roles as your family does.
Before you plan the rooms, see whether your property has enough space and access.
Building a 600 sq ft one-storey, 1-bedroom garden suite in Toronto costs about $270,000 to $385,000 CAD at October 2026 prices. The low end has wide yard access and short utility runs, and the high end adds a second bedroom, long utility runs, narrow access, and upgraded finishes.
Room for Family or a Rental Home?
Who lives in the suite shapes its layout, its privacy, and the paperwork that comes with it.
How a garden suite for family compares to one for a tenant.
| What you plan | For family | For a tenant |
|---|---|---|
| Layout | One storey with a step-free entrance suits a parent who wants no stairs. | A full kitchen, a bedroom with a closet, and laundry let a tenant live on their own. |
| Privacy | Windows and a patio facing your house make it easy to check in. | Windows and a patio facing away from your house keep both homes private. |
| Entrance | A path from your back door joins the two homes. | The firefighter path along your side yard gives a tenant their own way in from the street. |
| Paperwork | Your home insurer needs to know before anyone moves in. | A written lease, landlord insurance, and tax on the rent. An accountant can run the numbers for your situation. |
The same suite can serve your family in different ways over the years. It can be a first home for a grown child, then a rental, then a home for a parent, or a home for you while family takes the main house. The suite stays part of your property, since Toronto does not let a lot with a garden suite be split to sell it on its own.1
Can I Build a Garden Suite in My Backyard?
Your backyard fits a garden suite when it passes these 5 checks. A yard that fails one either has no room for a suite or needs a fix first. Each city in the area, such as Toronto, Vaughan, Markham, or Richmond Hill, sets its own size, height, and distance rules.
- Lot space: Your yard needs room for the suite behind your house, with the gaps the City requires between the suite, your house, and the lot lines. In Toronto, at least half of the backyard also stays lawn or garden.1 A shallow yard, or one mostly covered by a garage or patio, can leave no room.
- Yard access: Firefighters need a path from the street to the suite at least 1.0 m (3 ft 3 in) wide and 2.1 m (6 ft 11 in) high, clear of everything but gas and hydro meters.1 A side yard narrower than that, with no other way in from the street, rules a suite out. A path of 45 m (150 ft) or more needs sprinklers or other fire protection, and your contractor confirms what your suite needs during design. A narrow side yard slows the work, and a crane can lift materials over your house when overhead wires and the street leave room for one.
- Trees: A large tree near the suite, on your lot or a neighbour's, needs protection during the work. Toronto protects every City street tree and every private tree 30 cm (12 in) wide or more, and building near one or removing one needs a City permit. The City can refuse that permit when the suite would harm a healthy protected tree, which rules out that spot for the suite.1
- Water, sewer, and power: Each line runs from your house to the suite in a trench. A suite that sits lower than your sewer line needs a pump.
- Local approvals: Every garden suite needs a building permit. A lot that misses a zoning rule needs a minor variance from the Committee of Adjustment before work starts.
One Storey or Two?
A garden suite can have a second storey when your lot meets the City's height and distance rules. Each one trades yard space against stairs.
A one-storey garden suite compared to a two-storey one, where your lot allows both.
| What changes | One storey | Two storeys |
|---|---|---|
| Distance from your house | Can sit closer to your house, so it fits a shorter yard. | Has to sit farther from your house, so it needs a deeper yard. |
| Floor area | Up to the footprint limit, 60 sq m (645 sq ft) or 40% of your backyard, whichever is smaller.[^toronto-summary] | Up to about twice that on the same footprint, and smaller than your house.[^toronto-summary] |
| Your yard | Covers more of your yard for the same space inside. | Keeps more lawn and garden for the same space inside. |
| Stairs | No stairs, which suits a parent who wants to avoid them. | A stair between the bedrooms upstairs and the living space below. |
| Windows | Windows sit at about fence height. | Upstairs windows look over the fence, so the design places them away from neighbours' yards. |
Select Storeys in your estimate to price either one.
What Your Contractor Checks Before Your Final Quote
At your home visit, your contractor checks each item below, and your final quote prices what it finds. See how your quote becomes your final quote.
- Yard: The space your suite sits in.
- Zoning: The rules your suite has to meet.
- Access: The path crews and equipment take to your yard.
- Trees: The protected trees near your suite.
- Fire access: The length of the path from the street to your suite, which sets whether the fire rules require sprinklers.
Some problems stay hidden until the work opens them up, such as buried debris under your yard or a cracked sewer pipe at your house. Your final quote lists the few most likely in your project, each with its price range. When the work uncovers a hidden problem, listed or not, your contractor shows it to you and sends a written change order with its price and any added days. The repair starts once you sign the change order.
What Your Estimate Includes
Your estimate prices a complete small home with the rooms you select, its kitchen, and the utility lines that connect it to your house.
What your garden suite estimate covers.
| Cost | In your estimate |
|---|---|
| Foundation, framing, roof, and exterior | Included |
| Kitchen, bathrooms, and interior finishes | Included at the finish level you select |
| Water, sewer, and power lines dug, laid, and connected from your house to the suite | Included |
| Extra delivery time through a narrow side yard, or a crane over the house | Included when your yard access needs it |
| Sprinklers or other fire protection the fire rules require for a path from the street of 45 m (150 ft) or more | Included when your lot needs it |
| A deeper foundation or steel piles, which the building code requires on soft or wet ground | Shown as the ground conditions price variance under your estimate until the soil check during design |
| Tree protection and the tree permit the City requires near a protected tree | Included when a protected tree stands near the suite |
| The building permit application | Included |
| A larger electrical panel or a new water line from the street | Excluded, priced in your updated quote after the home visit |
| Drawings | Excluded, prepared by your designer or architect |
| Building permit fees | Excluded, paid at the City's rate with no markup when your contractor applies |
Price Your Garden Suite
Your Quote
Quote Total
Add Parking or Another Rental Unit
Many homeowners building a garden suite also price a detached garage at the lane or a legal basement apartment in the main house. Each one has its own estimate, and your quote sums up every estimate you save. To take one out, select Delete from quote on its page.
Every True Frame Builders contractor meets our standards for licences, insurance, permits, payments, and warranty before joining.
Before
After
Common Questions
How much does a garden suite cost in Toronto?
A 600 sq ft one-storey, 1-bedroom garden suite costs about $270,000 to $385,000 CAD at October 2026 prices. Price your garden suite for a price based on your own yard and choices.
Do I need a permit for a garden suite in Toronto?
Yes. Every garden suite needs a building permit, and a lot that misses a zoning rule needs a minor variance first. A protected tree near the suite needs its own tree permit. Your contractor prepares and submits every permit application your project needs, and your estimate includes that work. City permit fees and the drawings from your designer or architect are separate from your estimate. See the Toronto garden suite permit guide for the City's full rules.
How long does it take to build a garden suite?
A garden suite takes about 8 to 13 months from your contractor's first visit to move-in. Design takes 1 to 2 months, the permit takes 2 to 4 months, and construction takes 5 to 7 months. A minor variance adds 3 to 6 months before the permit.
Do Toronto's garden suite rules apply outside Toronto?
No. Toronto's rules cover lots inside Toronto. Vaughan, Markham, Richmond Hill, and each other city set their own rules for suite size, height, and distance from your house, and your contractor checks your lot against your own city's rules on site.
Should I build a garden suite or a laneway suite?
A garden suite sits in a backyard with no lane, and crews reach it through your side yard or by crane. A laneway suite sits beside a public lane, so crews and deliveries reach it from the lane, and it follows its own rules. If your lot backs onto a public lane, price it with the laneway suite estimate.