Laneway suite vs. garden suite in Toronto: which can your lot have?

Either rule book allows a two-storey suite up to 6.3 m tall at 7.5 m or more from the house, with no parking required. They differ on size, setbacks, landscaping and the firefighters' route, and those differences shape what can be designed on your lot.

of public lane needed for a laneway suite

3.5 m

tallest suite, at 7.5 m or more from the house

6.3 m

garden suite cap; 60 m² on one storey

120 m²

longest fire route, street to door, without added fire safety

45 m

Which one can your lot have?

The lane decides. A laneway suite needs a rear or side lot line on a lane for at least 3.5 m (11'6"), counting rear and side together; a garden suite is one in a building that doesn't abut a lane. A lot can have one suite, never both.

In the zoning by-law, a lane is a public right-of-way that isn't for general traffic; a private lane or a shared driveway doesn't count. The City's garden suite page sends any site on a public lane to the laneway rules.

What to check first

• Your survey: does a rear or side lot line meet a public lane, and for how many metres? The City also publishes a map of public laneways.
• Your zoning: both suites are permitted in the R, RD, RS, RT and RM zones of Zoning By-law 569-2013. On a lot still zoned under a former municipality's by-law, the garden suite permission doesn't apply; the City asks you to call Toronto Building. Low-rise lots are moving from the old by-laws into 569-2013 (By-law 650-2026 covers parts of Scarborough), so check the City's zoning map rather than the old city's name.
• Your zone label: an exception (the “x” number in the label) can change the rules for your lot.

Laneway suite vs. garden suite rules, side by side

Laneway suite

For a lot on a public lane for 3.5 m or more. No set floor area cap, but an 8.0 × 10.0 m footprint.

Garden suite

For a lot not on a lane. Capped at 120 m² of floor area, or 60 m² on one storey.

Both rule books were updated in July 2025 (By-laws 847-2025 and 849-2025).

Height for both is measured from average grade: the average ground level around the suite, existing or finished, whichever is lower.

Laneway suite fine print

• It must stay 2.5 m from the lane's original centreline, which puts it more than 1.0 m back from a lane under 3.0 m wide.
• Its 0 m side setback applies only on a neighbour's line; on a street side it takes the house's required side setback.
• From 4.0 m up, it steps 1.5 m back from a side line that meets a neighbour's rear lot line.

Garden suite fine print

• Side setbacks rise to 10% of the lot frontage where that's more, up to 3.0 m, with at least 1.5 m on a street side.
• On lots deeper than 45 m, the rear setback is half the suite's height if that's more.
• Under the 20% coverage option, the house keeps its own coverage limit, if any.

For both

• On lots 6.0 m wide or less, soft landscaping drops to 60% for a laneway suite and 25% for a garden suite.
• Either suite's deck must stay under 10% of its floor area.
• Both suites can have a basement: its floor area can be left out of the suite's gross floor area, but its walls must meet the setbacks, which apply below ground too (footings excepted).

How big and how tall can each suite be?

A garden suite is capped at 120 m² (about 1,292 sq ft) of gross floor area, or 60 m² (about 646 sq ft) on one storey. A laneway suite's size comes from its 8.0 × 10.0 m footprint, the yard, the landscaping rules and the 30% coverage limit. Both need less floor area than the house, and beside a small bungalow that rule can bite first.

Height and distance move together

Closer than 7.5 m to the house, either suite stops at 4.0 m tall, in practice one storey, and needs at least 4.0 m of separation. At 7.5 m or more, it can reach 6.3 m and two storeys.

So the first calculation on any lot is the yard's depth: separation, plus the suite, plus the rear setback (1.0 m at a lane, more on a lane under 3.0 m wide, 1.5 m for a garden suite).

Windows move walls

A garden suite's upstairs back windows more than 4.0 m above grade, facing a neighbour's yard, push its rear setback to 3.0 m, and a side wall with windows or doors needs at least 1.5 m. A laneway suite's blank walls can sit on a neighbour's lot line, built under the Building Code as 45-minute fire-rated walls with non-combustible cladding, and only a laneway suite can have an upper balcony. So we place the windows, the entrance and any deck before we fix the walls.

Fire access from the street

Firefighters must be able to reach the suite's door from the street with their equipment. Toronto Building checks it at the permit stage, and the Committee of Adjustment can't vary it. The requirement comes from the Ontario Building Code, not the zoning by-law; the distances and widths below are the way Toronto Fire Services and Toronto Building apply it.

• Length: 45 m (about 148 ft) or less from the public street to the suite's entrance, or up to 90 m with one of the City's two added fire-safety options.
• Width: a clear path 0.9 m wide and 2.1 m high to a laneway suite; to a garden suite, 1.0 m wide, or 0.9 m if it's sprinklered. Gas and hydro meters may project into it.
• Hydrant: within 45 m of where the fire truck would park.
• Route: through the lot, normally from the street the house faces. A laneway suite's route can also come along the lane from the street at its end.

A route longer than 45 m

Both of the City's options add an outdoor strobe light and an engineered smoke-alarm system.

Limiting distance runs from the wall to the lot line, the middle of a lane or street, or an imaginary line between the suite and the house.

When the side path is too narrow

Two neighbours can share the width through a Limiting Distance Agreement, a City template registered on both titles. Owners usually hire a lawyer for it, the City's lawyer bills $274.65 an hour, and the City says it takes a week at the very least.

Protected trees

The City expects garden and laneway suites to be designed around healthy protected trees. A neighbour's tree near the line counts as much as yours.

Which trees are protected

• On private land, a tree with a trunk 30 cm (about 12 in) across or more, measured 1.4 m above the ground.
• Every tree on a City street, at any size.
• Every tree on a lot in a ravine and natural feature protection area.
• Since September 1, 2026, any tree planted under a development approval or enforcement action; City staff can also name healthy trees over 61 cm across as Distinctive Trees, with added protection.

Protection zones and permits

Each protected tree has a protection zone, from 2.4 m around a 30 cm trunk to 6.0 m around a 1 m one, and at least double that in a ravine area. If digging, storage or site access reaches into it, you need a permit to injure or remove the tree, backed by an arborist's report, and for these suites the City can refuse it. Every building permit application also carries a Tree Declaration Form.

Water, sewer and power

For a garden suite, the City says water and sewer pipes are meant to connect from the house, and a laneway suite tied into the house's services follows the same Building Code rules. The trench crosses the yard, so its route is part of the design, and one through a tree's protection zone needs that tree permit.

Power and overhead lines

The designer declares with the permit application that the new building keeps the Building Code's clearances from overhead lines, and on a lane strung with wires that can decide where an upper storey goes. Decide early whether the suite runs off the house's panel or gets its own Toronto Hydro service; that cable needs a route across the yard too.

City fees and charges in 2026

The City's charges as posted on toronto.ca in 2026; our design fee is separate and quoted in writing.

Example: a one-storey, 60 m² garden suite

With no basement, it pays 60 × $18.56 + $56.33, about $1,170, for its building permit, with the City's free pre-approved plans or without. The $3,384.29 road damage deposit is paid with the application too, and the City refunds all but $95.01 on request after the work, less any repairs.

How to choose

On most lots the lane has already chosen the rule book. The decisions left to you are design decisions.

• One storey or two. Two storeys need 7.5 m from the house and double what a garden suite can hold.
• Who will live there. A parent who'd rather skip stairs, a tenant, an adult child or your own studio sets the bedroom count, and the bedroom count sets the floor area.

Which drawings

How to start

1. 01
   Find the lane, or confirm there isn't one

   Your survey shows every lot line and how much of it runs along a public lane.

2. 02
   Pace the fire route

   From the street to where the suite's door would be, the narrowest gap beside the house and the nearest hydrant.

3. 03
   Measure the trees

   Every protected tree, yours, a neighbour's or the City's, and how far each stands from where the suite would go.

4. 04
   Note the services

   Where water, sewer and power leave the house, and whether anyone lives in the basement.

5. 05
   Then design

   With those answers we test one storey against two, place the windows and the door, and design the suite your lot allows.