Updated July 2026
There is no single sticker price for a deck, and any Ottawa builder who gives you one over the phone before seeing your yard is guessing. What we can do is show you the honest ranges, explain exactly what moves the number, and tell you how we arrive at a real, project-specific price instead of a made-up one.
How much does a deck cost in Ottawa?
Across Canada in 2026, a new deck typically costs between $35 and $130 per square foot, installation included, and the single biggest lever is the material you choose. Pressure-treated is cheapest, cedar sits in the middle, and composite or PVC cost the most up front in exchange for almost no maintenance.
For a sense of a whole project rather than a per-foot figure, a standard 12 by 12 foot deck (144 square feet) starts around $5,500 for pressure-treated wood and climbs to $18,000 or more for a premium composite build with glass railings and helical piles. If you are replacing rather than building new, a resurface over sound framing runs a different range again (roughly $5,000 to $15,000), while a full tear-down and rebuild is more like $15,000 to $50,000, depending on size and material.
Ranges this wide are exactly why we do not publish a price list. Here is how the four deck materials we build in compare, using published 2026 national ranges (aluminium framing and railing systems run higher again, at roughly $95 to $135 per square foot):
| Material | Installed cost per sq ft | What you are paying for |
|---|---|---|
| Pressure-treated wood | $35 to $60 | The most affordable, code-built structure. Needs cleaning and re-staining every couple of years. |
| Western red cedar | $60 to $90 | Warm natural wood, cooler underfoot. Re-oil every couple of seasons or let it silver. |
| Composite (Trex, Fiberon, TimberTech) | $100 to $130 | No sanding, sealing or staining. Colour holds through freeze-thaw. |
| PVC (Azek, Clubhouse) | $100 to $130 | Fully synthetic, lightest and most moisture-proof. Strongest choice beside a pool. |
Source: RenoQuotes: Deck Cost in Canada 2026 · Ottawa Contractors: deck transformation guide
What actually drives the cost of your deck
Four things account for most of the spread, and size is only one of them.
Size. More square footage means more material and more labour. This is the obvious one, but it is not the biggest swing on a small deck.
Material tier. As the table shows, moving from pressure-treated to composite roughly doubles the per-foot cost. You are buying down future maintenance, not just a look. Over 8 to 12 years, most homeowners recover the composite premium in the staining and sealing they never have to do.
Structure. A ground-level rectangle is the cheapest thing we can build. A second level, built-in stairs, custom railings (glass or aluminium), lighting, or a pergola on top each add labour and material well beyond the deck surface itself.
Permits and site conditions. A deck that needs a City of Ottawa building permit carries the added time of drawings and an application. Grade, drainage and access to the yard also affect how the base and footings have to be built, especially for Ottawa's freeze-thaw ground movement. We cover this in full in our Ottawa deck and fence permit guide.
Why Ottawa's climate changes the maths
Ottawa runs through dozens of freeze-thaw cycles a year, and that is hard on a deck. It is why we set footings below the frost line so the structure does not heave by spring, and it is a real argument for composite or PVC boards, which resist the moisture, rot and fading that put wood decks on a re-staining schedule.
A cheaper wood deck can cost more over ten years once you count the upkeep. We walk you through that trade-off for your specific yard rather than pushing the most expensive board. And if a patio makes more sense than a deck for part of your yard, the same freeze-thaw logic shapes our interlock patios and walkways too.
How we price a deck, and why it is honest
Every project is modelled in 3D and AutoCAD before a single board is cut. That means when we give you a price, it is tied to the exact layout, material, railing, stair and lighting choices you have already seen and approved, not a rough guess that balloons later. You get one project-specific number.
If it helps to spread that number out, financing is available through our third-party partner iFinance (any figure we mention in conversation is illustrative only, not an offer of credit).
Common questions
How much does a composite deck cost in Ottawa?
Published 2026 Canadian ranges put installed composite and PVC decking at roughly $100 to $130 per square foot, versus $35 to $60 for pressure-treated and $60 to $90 for cedar. These are national industry ranges, not an Ottawa Decking Solutions quote. Because size, structure, railings, lighting and permits all move the number, we design your deck in 3D first and then give you one honest, project-specific price.
What does a 12 by 12 deck cost in Ottawa?
For a 144-square-foot deck, published 2026 Canadian ranges start around $5,500 for a pressure-treated build and climb to $18,000 or more for a premium composite deck with glass railings and helical piles. Your real number depends on the material, the structure and whether the project needs a City of Ottawa permit, which is why we quote per project rather than from a price list.
Why won't Ottawa Decking Solutions give a price over the phone?
Because an honest deck price depends on the yard, the base and drainage conditions, the material tier, and the exact design. We design every deck in 3D and AutoCAD first so you can see and approve the layout, then give you one project-specific price tied to that design, and financing is available through our third-party partner iFinance if it helps spread the cost.