How Much Does a Deck Cost in Ontario in 2026?
Real installed cost ranges by material, what actually moves the price, and how to get a full priced estimate for your own project in under a minute.
If you've gotten a few deck quotes and the numbers don't seem to agree with each other, that's normal — deck pricing in Ontario varies more by material and site conditions than almost any other trade. Here's what homeowners and contractors are actually seeing in the current market, and why two decks that look similar on paper can price thousands apart.
Ontario deck cost per square foot (installed)
Across current Ontario pricing, installed cost — meaning materials, framing, footings, and labour together — breaks down roughly like this:
| Material | Cost per sq ft | 144 sq ft deck |
|---|---|---|
| Pressure-treated lumber | $45–65 | $6,500–9,400 |
| Cedar | $55–80 | $7,900–11,500 |
| Composite (Trex, TimberTech, Fiberon) | $65–95 | $9,400–13,700 |
Pressure-treated remains the cheapest way to build, but it needs regular staining and sealing to hold up through Ontario's freeze-thaw cycles. Composite costs more upfront but needs essentially no annual maintenance — over 15–20 years, many homeowners find the total cost gap narrows or disappears.
What actually moves the price
- Height and elevation. A ground-level deck is the cheapest version of any material. Once you're building a raised deck or a second-storey walkout, expect an extra $2,000–15,000 for the additional structure, hardware, and safety requirements — bigger posts, more bracing, more time on site.
- Footings and frost depth. In southern Ontario, footings need to reach below the frost line — roughly 4 feet (1.2 m). Get this wrong and the deck heaves out of level within a winter or two, which is a much more expensive fix than doing it right the first time.
- Railings. A basic aluminum or wood railing system is priced into the ranges above. Glass railing panels are a different category entirely — often $150–300+ per linear foot — and can add five figures to an otherwise modest deck.
- Permits. Most Ontario municipalities require a building permit for any deck more than about 600 mm (24 inches) above grade, or over roughly 108 sq ft. Permit fees typically run $150–400, but every municipality sets its own thresholds and fees — always confirm with your local building department before pricing a job.
Get your actual number, not just a range
Ranges are useful for budgeting, but they can't tell you what your deck will cost — that depends on your exact dimensions, site access, and material choice. PDEstimates turns a plain-English description of your job into a full priced materials-and-labour estimate in seconds, built for your region.
Try it free →A realistic budget range
Put together, most Ontario homeowners land somewhere between $8,000 and $18,000 for a straightforward 12×16 ft deck, depending on material and whether it's ground-level or raised. Larger, multi-level, or premium-material builds can run well beyond that — it's not unusual to see complex custom projects clear $50,000 once integrated lighting, built-in seating, or exotic hardwoods enter the picture.
The most common mistake isn't picking the wrong material — it's underestimating what sits below the visible decking: footings, framing, waste factor, hardware, and disposal all add up before a single deck board goes down.
Cost ranges reflect general 2026 Ontario market conditions and are for planning purposes only — actual pricing depends on your specific site, material selection, and local labour rates. Always get a project-specific estimate before budgeting a real job.