The City of Toronto would very much like you to build a garden suite. It has removed the parking requirement. It has exempted the unit from development charges. It has published a catalogue of finished architectural plans you can use for nothing. It has let engineers sign off on designs to speed up review, and it has put the whole application online.
By any reasonable measure, the paperwork has been cleared out of the way.
And yet. Between 2022 and May of 2025, Toronto received 812 garden suite building permit applications and issued 480 permits. That is real growth — 56 applications in 2022 became 361 in 2024 — but it is not the wave the policy was built for, in a city of well over half a million low-rise properties.
So the interesting question isn’t how do I get a permit for a garden suite. The City has answered that one thoroughly. The interesting question is the one I get asked in back yards in Leslieville and Riverdale and East York, usually about ten minutes into the conversation: can my lot actually take one of these, and what is it really going to cost me?
That’s a different question, and the free plans don’t answer it.
Laneway or garden suite — and the difference that actually matters
Both are self-contained second homes on your lot: kitchen, bathroom, sleeping space. Neither can be severed and sold separately. The usual explanation of the difference is about the lane — a laneway suite backs onto a public laneway, a garden suite doesn’t, and garden suites opened the door to far more properties when they were permitted in 2022.
That’s correct, and it’s also not the part that will decide your project.
Here is the part that will, in the City’s own words from its 2025 monitoring report: “Whereas laneway suites have two means of emergency access, through the property or via the laneway, garden suites have only a single access route, through the property adjacent to the main dwelling.”
Read that again with an East-end lot in mind. A laneway suite has a lane behind it — a second way in for a fire crew, and a second way in for your excavator, your concrete, your lumber and your trades. A garden suite has one route, and on most of our lots that route is a side passage between two houses that you can barely walk a wheelbarrow down.
The lane isn’t a technicality about which by-law applies to you. The lane is the whole build.
The plans are free until you touch them
The pre-approved catalogue is genuinely useful. Studio and two-bedroom designs, garden and laneway versions, heat pump or forced air, already reviewed by Toronto Building against the Building Code and the zoning by-law. You reference a plan number on your application instead of submitting drawings. That saves real design money and real review time.
Then there’s this, stated plainly on the City’s own page: “If any modifications are made to the pre-approved plan selected, including HVAC or plumbing modifications, the plan will no longer be considered pre-approved, and this process for applying for a building permit will NOT apply.”
Including HVAC. Including plumbing.
I want to be fair to the City here — that limitation is unavoidable. The moment a drawing changes, it hasn’t been reviewed. But you should understand what it means on a ninety-year-old East-Toronto property. These are standard designs meant to drop onto a lot cleanly. Our lots are not clean. They are narrow, they are irregular, they slope, they have a mature tree in exactly the wrong place, they have a garage foundation nobody has looked at since 1968, and they have services running where the drawing assumes they don’t.
If your lot takes a catalogue plan unmodified, take it — you’ve saved yourself real money and several weeks. Genuinely. But go in knowing that “free plans” and “free plans for my lot” are two different statements, and that you find out which one you’re in fairly early.
One more thing worth knowing: even with a pre-approved plan, you are still taking responsibility for the design. The City is explicit about it. And the plan being pre-approved says nothing about whether it can legally sit where you want to put it — the placement on your lot still goes through a full zoning and applicable-law review.
The 45-metre line
This is the rule I’d want you to know before anything else, because it is the one that quietly disqualifies back yards.
Toronto Fire Services requires a level, unobstructed exterior path to the suite — no longer than 45 metres, and at least 1.0 metre wide by 2.1 metres high. That’s the baseline. Miss it and you don’t simply pay more; you’re into a different compliance route.
There are two ways past 45 metres, and the distance can extend to 90 metres if you take one of them:
- Option 1 — automatic sprinklers, an exterior strobe, and a smoke alarm and warning system.
- Option 2 — increased fire-protection materials and construction methods, an exterior strobe, and a smoke alarm and warning system. No sprinkler.
I’m spelling both out because a lot of what you’ll read online collapses them into “you’ll need sprinklers past 45 metres,” and that isn’t true. Option 2 exists, and on a lot of projects it’s the cheaper road. Which one is cheaper on your project depends on the suite’s construction and what a sprinkler line would cost to run to the back of your property — which brings you straight back to access.
And the width matters as much as the length. One metre of clear, level, unobstructed path, the whole way. Not one metre between the houses and then eighty centimetres past the gas meter. If you genuinely can’t get the width on your own land, there is a route — a Limiting Distance Agreement with your neighbour, registered with the City — but you are now asking the person next door to sign a legal agreement about their side yard before you can build. That is a conversation, not a line item.
The City knows this is where projects die. Its own staff wrote: “Staff are aware of the challenges that designers have had in meeting the fire access requirements for garden suites, which can impact the feasibility of these projects.”
Measure your side passage before you do anything else. Street to where the suite’s door would go. Length and clear width. It takes ten minutes and it is the highest-value ten minutes in this whole process.
What the City’s numbers say — and what they don’t
I’d rather give you the real data than a confident guess, so here it is with its limits attached.
As of May 8, 2025: 812 applications received, 480 permits issued — 59 per cent. About 70 per cent of applications proceed to permit without needing a minor variance, which is a genuinely good sign; the by-law mostly works as written.
What the City does not publish is a count of garden suites completed. I looked for it. Its monitoring report tracks applications, permits, variances and tree permits — not finished buildings. You will see numbers floating around online claiming a specific total built. I can’t verify any of them, so I’m not going to repeat them.
What I’d point at instead is the gap that is documented: 812 applications, 480 permits, over three years. Roughly four in ten applications hadn’t converted to a permit. Some of those are simply in the queue. But some of them are people who got far enough into the process to apply and then found out what I’ve just described — about their side passage, about their tree, about what modifying the free plan would mean.
What it costs, honestly
The City’s consultants pulled construction values off the building permit applications themselves and found an average of about $260,000 and a median of about $180,000.
Now here is the sentence right after it in the same report, which is the sentence that matters: those permit-declared values “may be underreported,” and “industry experts indicate actual construction costs often exceed $300,000.00 – $400,000.00 or more depending on site-specific servicing needs.”
That’s the City telling you its own headline number is soft.
Our own range, from our own projects and published in the Woodsmith Cost Index, is $440,000 to $810,000 for a laneway or garden suite. That is a long way above the permit-declared average, and I’d rather show you the gap than hide it. A suite is a small custom house — foundation, envelope, mechanicals, kitchen, bathroom, finishes, all to current energy standards — built somewhere a truck usually can’t reach.
The cost drivers are the ones you’d expect once you’ve understood the access problem:
- Getting materials and equipment to the back. When a truck can’t reach the site, everything is carried, craned or hand-bombed. The national cost guides you’ll read are written for places where a truck can back up.
- Servicing. Water, sanitary and hydro have to cross the yard from the main house. On older properties, what you find when you open that trench is not always what the drawings assumed.
- Fire access compliance. Option 1 or Option 2, if you’re past 45 metres.
- Trees. Toronto’s tree protection rules routinely shape where the suite can go and how big it can be, and the permit process for tree injury or removal is its own timeline.
Average unit size applied for, for scale: about 82 square metres.
Development charges: exempt, until they aren’t
This one is worth getting right, because a lot of published advice is out of date in both directions.
A garden or laneway suite on a lot with an existing house is exempt from development charges. Toronto’s by-law exempts the second through sixth units in developments of up to six units, and the province’s additional-dwelling-unit exemption covers a unit in an ancillary structure — which is exactly what these are. Not deferred. Not payable later. Exempt.
You will still see the City’s Development Charge Deferral Program referenced all over the internet as though it’s the main event. It isn’t, any more — it’s the mechanism for the edge cases, principally where the suite pushes you past the exempt band. And even then it doesn’t work the way people describe: the charges are collected only if a new lot is created — a severance, a plan of subdivision, a condominium — within twenty years. It’s a default trigger, not a bill with a due date.
Where it does bite: stacking. If you apply for a fourplex conversion and a garden suite at the same time, you’re outside the simple case, and the City has been explicit that development charges apply per unit in that scenario. If you’re thinking about converting the main house into multiple units and putting a suite in the back, get the sequencing and the unit count looked at before you file anything. That’s a planning decision with a real dollar figure attached.
Permit fees are separate and modest by comparison — this work is charged per square metre of new construction under the residential rate, plus a per-unit fee. Rates change annually, so check the City’s current fee schedule rather than any blog post, including this one.
What’s changing in the by-law
The City’s 2025 monitoring review recommended a set of amendments, and the direction of travel is worth knowing if you’re planning:
- Maximum floor area to be capped at 60 square metres for a one-storey suite and 120 square metres for two storeys.
- Maximum height of 6.3 metres extended across the city. This one has an East-end footnote: Beaches–East York had its own 6.3-metre allowance since 2022 while the rest of the city sat at 6.0. Rather than keep the exception, the City proposes to give everyone the 6.3. The review found that an extra 0.3 metres would have eliminated 66 per cent of the height variances applied for between 2022 and August 2024 — which tells you how many projects were going to a hearing over a foot of height.
- Ward 19’s area-specific separation-distance rule is proposed to be retired, with the citywide standard aligned to the provincial regulation instead.
If you’re in the east end and you were planning around the old Ward 19 numbers, confirm where this landed before you design to them.
So should you build one?
Here’s the part I’d actually say to you standing in your yard.
If you have a real laneway — proper access, a lane a truck can use — a laneway suite is a good building and the economics can work. You’ve got the second access route the City talks about, and you’ve got a way to get materials to the site.
If you don’t have a lane, be honest about your side passage before you fall in love with the idea. Measure it. If it’s tight, the suite isn’t impossible, but it is going to cost more than the guides say and you should know that at the beginning rather than at week six.
And I’d put one more option on the table, because it’s usually the right one out here and almost nobody sells it to you: the basement. In East Toronto a legal basement suite is very often still the more cost-effective second unit, precisely because the access problem doesn’t exist — the unit is inside a structure you already own, under a roof that already exists, reachable through a door. It has its own hard variable, and it’s a big one: what’s under your foundation and whether it needs underpinning. But it’s a different risk, not automatically a worse one.
The right answer is lot-specific. Anyone who tells you a garden suite is the answer before they’ve walked your side yard is selling, not advising.
Woodsmith Insight
The City has spent four years removing every obstacle it controls — parking, development charges, design cost, review time, paperwork. Uptake still lags. That should tell you something: the binding constraint on a backyard suite in the east end was never the by-law. It’s the metre and a bit between your house and your neighbour’s, and no policy can widen it.
Frequently asked questions
Both are self-contained second dwellings on your lot that can’t be severed or sold separately. A laneway suite backs onto a public laneway; a garden suite sits in the rear yard of a lot without one. The difference that matters in practice is emergency and construction access: the City notes that laneway suites have two access routes — through the property or via the lane — while a garden suite has only one, through the property beside the main house.
Yes, and they’re genuinely useful — reviewed against the Building Code and zoning, and you reference a plan number instead of submitting drawings. But if you modify the plan in any way, including HVAC or plumbing changes, it is no longer pre-approved and the streamlined route no longer applies. You also still take responsibility for the design, and the placement of the building on your lot still goes through a full zoning review.
Toronto Fire Services requires a level, unobstructed exterior path no longer than 45 metres and at least 1.0 metre wide by 2.1 metres high. You can extend to 90 metres using one of two compliance options: Option 1 adds automatic sprinklers, an exterior strobe and an alarm system; Option 2 adds upgraded fire-protection materials and methods, an exterior strobe and an alarm system, with no sprinkler required. Measure both the length and the clear width before you plan anything.
There is a route — a Limiting Distance Agreement registered with the City, sharing the required width with the neighbouring property. It requires your neighbour’s cooperation and a legal agreement, so treat it as a real conversation to have early rather than a formality.
The City’s own analysis of building permit values found an average of roughly $260,000 and a median of roughly $180,000, but the same report cautions those values may be underreported and notes industry experts put actual construction costs above $300,000–$400,000 or more depending on site servicing. Our own published range from real projects is $440,000 to $810,000. On a tight East-end lot with poor rear access, expect the upper end, because materials and equipment have to be carried, craned or hand-bombed to the back.
Generally no. A suite on a lot with an existing house is exempt — Toronto exempts the second through sixth units in developments of up to six units, and the provincial additional-dwelling-unit exemption covers units in ancillary structures. The older Development Charge Deferral Program still exists but now applies to edge cases. Be careful if you’re combining a suite with a multiplex conversion: stacking can put you outside the exemption, and charges apply per unit.
No. Parking is not required for laneway or garden suites in Toronto.
It depends entirely on your lot. In East Toronto a legal basement suite is often still the more cost-effective second unit, because it avoids the access problem that drives garden-suite costs here. The basement’s own variable is what’s under the foundation and whether it needs underpinning. Neither is automatically the right answer — the lot decides.
A building permit is always required. About 70 per cent of garden suite applications proceed without needing a minor variance, so the odds are reasonably good — but if your design needs relief on height, floor area or separation, you’d apply to the Committee of Adjustment first, which adds a hearing and months to the schedule.
The City’s 2025 review recommends capping floor area at 60 square metres for one storey and 120 square metres for two, with a maximum height of 6.3 metres extended citywide. The average suite applied for so far is about 82 square metres. Confirm the current provisions before designing.
Related reading: what a legal basement suite really costs in an older East-Toronto home, underpinning vs. bench footing, converting an older Toronto home into a multiplex, and the Toronto building permit process. The City publishes its own pre-approved garden and laneway suite plans.
Wondering whether your back yard can actually take a suite? Let’s measure it together.
