Something I have been getting asked about more consistently over the last year is garden suites. Homeowners who have backyard space in Toronto are increasingly curious about whether putting a separate structure back there – a small self-contained unit – makes financial sense.
The short answer: it can. The longer answer is that the numbers need to work, and the permit process has enough nuance that going in without a clear picture is a mistake.
Here is what you should know before you start calling anyone for quotes.
What a Garden Suite Actually Is
A garden suite is a separate residential unit built on your property, freestanding from your main home, typically in the backyard. It is not an addition to your house, and it is not a basement apartment. It is its own structure – a small self-contained home that can serve as a rental unit, a space for a family member, or a long-term investment in the property.
Toronto legalized garden suites city-wide in 2022 and has expanded the program since. If your lot is zoned for residential use and you have the space, you are generally eligible to apply.
What It Costs in 2026
Hard construction costs are running $400 to $600 per square foot for a garden suite in Toronto right now. On a 600-square-foot build – which is a functional one-bedroom – that puts hard construction alone at roughly $240,000 to $360,000.
The all-in budget, which includes design, permits, utility servicing connections, landscaping restoration, and a reasonable contingency, typically lands between $300,000 and $525,000 depending on finishes and site conditions.
One meaningful way to reduce soft costs: the City of Toronto offers pre-approved “Made in Toronto” plan packages. Using a pre-approved plan cuts architectural fees significantly. Standard custom design runs $10,000 to $25,000. The pre-approved route reduces that substantially. You still need to pull a building permit, and a zoning review is strongly recommended before you commit to anything.
The Permit Process
Garden suites are permitted in most Toronto residential zones, but the process has real steps:
- Get a zoning applicable law certificate (called a Zoning Review) to confirm your lot and proposed structure qualify
- Apply for a building permit – the City’s pre-approved plans streamline this considerably
- Arrange utility servicing – water, sewer, and electrical connections to the new structure are your cost and require separate permits
- Build
Permit timelines in Toronto have improved since the pre-approved plan program launched. Budget eight to twelve weeks from a completed application to permit issuance for a standard build. If your lot has any complexity – easements, ravine proximity, irregular setbacks – that timeline extends.
Who This Works for and Who It Does Not
Garden suites work best when you have a lot with genuine yard depth (typically 50 or more feet of usable backyard), no major servicing obstacles, and a long time horizon on the property.
The rental income math can support the build if you are planning to hold for ten or more years. A 600-square-foot garden suite in the east or west end of Toronto realistically rents for $2,200 to $2,800 per month in 2026. At $2,500 per month, that is $30,000 per year in gross rental income. Against an all-in build cost of $400,000, the payback period on the hard investment is roughly 13 years before expenses – long, but the asset also increases your property value considerably.
If you are planning to sell in the next three to five years, the math is less obvious. Not every buyer pays a full premium for a garden suite on a mid-sized Toronto lot, particularly if the yard feels crowded afterward.
One Thing Homeowners Frequently Overlook
Connection costs for water and sewer to a detached backyard structure can run $15,000 to $30,000 or more depending on the route and the distance from the street main. This is a line item that consistently gets underestimated when people are comparing quotes. Make sure whoever you are working with has a clear line for utility servicing in the estimate – not just the building shell.
If you have questions about whether a garden suite makes sense for your specific lot, drop a reply below. LF Builders has been working in Toronto and the surrounding GTA for over 50 years and we are happy to talk through the numbers with you.
Related reading on the forum: Toronto Secondary Suites 2026: Is Adding a Basement Apartment Worth It?