How much does a laneway or garden suite cost in Toronto?
Toronto's laneway and garden suite permits, with the declared construction value of each — the clearest public price signal for ADUs.
The full spread, not an average
| Percentile | Declared value |
|---|---|
| P25 — smaller jobs | $100K |
| Median | $200K |
| P75 — larger jobs | $400K |
| Largest in sample | $10.0M |
1,077 permits with a declared value, trailing 36 months. Medians and quartiles only — one outlier can't move them.
Why two of these quote differently
- Floor area and storeys — most are 500–1,200 SF over one or two levels.
- Servicing: a new water and sanitary connection to the main house or street is often the single largest line.
- Fire access and separation distances, which can force upgraded cladding and windows.
- Foundation type and tree protection — a protected tree can dictate the whole structural approach.
Check it against the record
| Applied | Address | Declared value |
|---|---|---|
| Aug 2026 | 84 KINGS PARK BLVD
Proposal to construct a new 2 storey garden suite. |
$300,000 |
| Aug 2026 | 109 REGINA AVE
Proposal for Garden suite |
$1,500,000 |
| Aug 2026 | 592 RIDELLE AVE
New one storey rear yard garden suite |
$1,000,000 |
| Aug 2026 | 96 DOVERCOURT RD
Construct new 2 storey laneway suite |
$600,000 |
Where these numbers come from
Declared construction values on City of Toronto building permits (tier C), trailing
36 months, minimum 12 permits before a guide is published. A declared value is
what the applicant stated the work is worth — it can sit below final hard cost,
which is exactly why GROUND also publishes
awarded contract prices.
Garden suites (rear yard, no laneway required) were legalized citywide in 2022; the mix in this data has shifted toward them since.
Data: Open Government Licence — Toronto. Recomputed automatically as new
permits land; the figures above are current as of August 18, 2026.
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