Ontario · 2026 Estimate Guide
How to Write a Deck Building Estimate (What to Include + Free Template)
If you build decks, the estimate is where you win or lose the job — and your margin. A vague number scares homeowners; a clear, itemized quote wins trust and protects you from the surprises that eat profit. Here's exactly what belongs on a professional deck estimate in Ontario, with real 2026 pricing references and a sample you can copy.
The line items every deck estimate should include
- Framing & structure — Pressure-treated joists, beams, posts, blocking, hardware. Framing is almost always PT regardless of decking material.
- Decking surface — The material and its labour (PT, cedar, or composite).
- Footings — Ontario's ~48" (1.2 m) frost line means every post needs a proper footing. A 200 sq ft deck typically uses 6–10.
- Railings — Required by the Ontario Building Code for any deck over 24" (600 mm) above grade.
- Stairs — Framing, treads, and a landing/footing at grade.
- Demolition & disposal — If replacing an old deck, a real separate cost.
- Permits — Most attached decks or those over 24" need one; ground-level under ~200 sq ft often exempt — confirm the municipality.
- Contingency — 10–15% for what you find once you open it up (rotted rim joists, drainage, soil).
- HST — A line, not an afterthought.
Realistic Ontario cost references
- Installed, all-in (PT)$45–65/sq ft
- Installed, all-in (cedar)$55–80/sq ft
- Installed, all-in (composite)$65–95/sq ft
- 12×16 (192 sq ft) deck, PT$8,600–12,500
- Labour$25–45/sq ft (~40–60% of cost)
- Footings (200 sq ft, concrete)$900–2,500
- Railings$40–60/lin ft (wood), $50–90/lin ft (aluminum)
- Old-deck demolition & disposal$4–8/sq ft
Sample deck estimate
12×16 pressure-treated, ground-level (illustrative — build your version from your real supplier and labour rates)
| Framing & structure (PT) | $3,400 |
| PT decking surface + install | $3,600 |
| Footings (8) | $1,600 |
| Railing (50 lin ft, wood) | $2,600 |
| Stairs (4 steps + landing) | $900 |
| Disposal / cleanup | $500 |
| Subtotal | $12,600 |
| Contingency (10%) | $1,260 |
| Subtotal before HST | $13,860 |
| HST (13%) | $1,802 |
| Total | $15,662 |
Don't forget HST
In Ontario, HST (13%) applies to both labour and materials on residential deck work. Decide whether your quoted prices include or exclude HST and state it clearly on the estimate — ambiguity here causes disputes at invoice time. Show HST as its own line so the customer sees the pre-tax price and the total. For your own filing and any new-build/substantial-renovation rebate questions, confirm with your accountant or CRA.
Common mistakes that cost you the job — or the margin
- ×Omitting disposal on a replacement, then absorbing it.
- ×No contingency, so every rotted joist comes out of profit.
- ×Vague line items ("deck — $12,000") that make homeowners suspicious and invite lowball comparisons.
- ×Not clarifying HST in/out, then arguing about it later.
- ×Under-pricing footings and railings on elevated decks.
Skip the blank page — get this estimate in 60 seconds
Describe your deck job and we'll send you a clean, itemized estimate PDF, free. Materials, labour, footings, railings, HST — all laid out and ready to send to your customer.
Get a free custom estimate →FAQ
Do I need to include a permit line in my deck estimate?
If the deck is attached or over 24" above grade, yes — quote it or note it as the homeowner's responsibility, but don't leave it silent.
How much contingency should a deck quote carry?
10–15% is standard in Ontario; older homes and elevated builds lean toward the higher end.
Should my price include HST?
Either works — but state it plainly and show HST as a separate line.
Cost figures are planning references, not fixed quotes. Prices shown by the tool are editable starting points, never authoritative quotes. Contractors must confirm their own current material and labour rates. Region entries with validated:false need that province's correct sales-tax treatment (HST vs GST+PST/QST) written before generating pages — do not assume 13% everywhere.