How much does a deck cost in Toronto?
Every deck built in Toronto with a building permit declares a construction value. These are those numbers — not a contractor's estimate range.
The full spread, not an average
| Percentile | Declared value |
|---|---|
| P25 — smaller jobs | $8K |
| Median | $15K |
| P75 — larger jobs | $30K |
| Largest in sample | $1.5M |
293 permits with a declared value, trailing 36 months. Medians and quartiles only — one outlier can't move them.
Why two of these quote differently
- Height above grade — a deck more than 0.6 m up needs guards and, past 2.4 m, engineered footings.
- Footings: helical piles or sonotubes to below frost line drive a surprising share of the cost.
- Structure material — pressure-treated versus cedar versus composite roughly doubles the deck surface cost.
- Whether the permit also covers stairs, a roof, or a walkout — those inflate the declared value.
Check it against the record
| Applied | Address | Declared value |
|---|---|---|
| Aug 2026 | 145 MARLBOROUGH PL
PROPOSED DECK AND ROOF STRUCTURE |
$15,000 |
| Aug 2026 | 3 BROOKE AVE
Replace existing damaged front porch, increase depth of porch, and modify existing... |
$50,000 |
| Aug 2026 | 23 GALLEY AVE
Proposal to repair existing balcony in the front of semi-detached SFD on the 2nd... |
$6,500 |
| Aug 2026 | 72 BROWNING AVE
Proposal for front balcony and deck guard |
$30,000 |
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.
A permit is required in Toronto when a deck is more than 0.6 m above grade or attached to the house. Small ground-level decks never appear here.
Data: Open Government Licence — Toronto. Recomputed automatically as new
permits land; the figures above are current as of August 19, 2026.
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