✓ The Decision
- DIY it if you're comfortable with framing, you'll pull the permit, and the deck is low to moderate height — you save roughly 40–50% by supplying the labour, the single biggest line on the bill.
- Build in pressure-treated if budget leads — it's the lowest-cost material by a wide margin and perfectly sound when built and maintained well.
- Spend up to composite/PVC if you'll keep the deck 10+ years and want to stop staining and sealing — you pay more upfront to buy back weekends later.
- Hire it out if the deck is tall, attached, structurally complex, or carries a hot tub — the labour premium buys engineering, speed, and a warranty that survives.
- Price your exact build before committing — the cost driver that dominates one deck (material) is trivial on the next (a tall deck's stairs and guards). Don't budget from someone else's deck.
A deck is one of the highest-return outdoor projects a Canadian homeowner can take on — and one of the widest price ranges. In 2026, a built deck runs anywhere from about $35 to $130 per square foot installed, because "a deck" covers everything from a ground-level pressure-treated platform to a raised composite deck with glass railings and a staircase. The good news for DIYers: the materials are the small half of that number. Supply your own labour and a pressure-treated deck comes in around $15–$30 per square foot in materials. This guide gives you honest ballparks both ways, then hands you a calculator for your actual deck.
The Deck Cost Calculator estimates your DIY materials — surface, framing, railings, and stairs — by size and material. For the footings, drill into the foundation tool.
Deck Cost Calculator Foundation Calculator
DIY Materials, by Size (Pressure-Treated)
If you're building it yourself, here's the materials-only ballpark for a standard pressure-treated deck — framing, decking, hardware, and footings, before tax and tools. These are planning ranges; your design, height, and local prices move them.
| Deck size | Area | DIY materials (PT) |
|---|---|---|
| 10×10 | 100 sq ft | $1,500–$3,000 |
| 12×16 | 192 sq ft | $2,900–$5,800 |
| 16×20 | 320 sq ft | $4,800–$9,600 |
Switching the decking and railings to composite or PVC is where the materials bill climbs — composite boards run roughly double pressure-treated, which is why the same deck can land anywhere in that $35–$130/sq ft installed band. We'll cover material trade-offs in depth in a dedicated decking-materials guide; for budgeting, just know PT is the floor and composite/PVC is the ceiling.
What a Contractor-Built Deck Costs
Hand the whole job to a builder and you're mostly paying for labour — certified deck builders bill roughly $40–$80/hour in 2026, and labour is the largest variable in the quote. Installed, expect about $45–$65/sq ft for pressure-treated, $55–$80 for cedar, and $65–$95 for composite. By size, that puts a basic PT deck with railing and standard footings around:
| Deck size | Contractor-built (PT, basic railing) |
|---|---|
| 12×12 (144 sq ft) | $6,500–$9,400 |
| 12×16 (192 sq ft) | $10,000–$18,000 |
| 16×20 (320 sq ft) | $12,000–$19,000 (PT) · up to $20,000–$32,000 in composite |
The gap between the DIY-materials table and these numbers is the labour you'd be supplying yourself — roughly 40–50% of a built deck's cost.
What Drives the Cost
Decking material, height and site access, foundation method, and railings and stairs all move the number — but here's the honest truth most cost guides skip: which one dominates is different for every build. On a sprawling ground-level deck, the decking material is almost the whole story. On a tall, narrow deck off a second floor, the framing, guards, and a long staircase swamp the material choice. A tricky lot with no equipment access pushes labour up regardless of material. There's no universal "biggest factor," which is exactly why a generic per-square-foot number will mislead you. Put your real dimensions, height, material, and foundation into the calculator and let it weight the drivers for your deck rather than someone else's.
Where You Can Save (and Where You Shouldn't)
Save: supply your own labour if you can frame; choose pressure-treated and upgrade only the surface you touch; keep the deck low and rectangular (height and angles cost money); build the foundation that your soil actually needs rather than over-building it; and pour or drive footings in one mobilization.
Don't save: on the footings and frost depth, on structural hardware and the ledger connection, or by skipping the permit. The foundation and the house connection are the two things that turn a cheap deck into an expensive — or dangerous — one.
✗ Deal-Breakers — Stop and Solve These First
- Budgeting from a per-square-foot number you read online. Your height, material, and foundation can double it. Price your own build.
- Cheaping out on the foundation. A heaving footing or a failed ledger costs far more than it ever saved — see the foundations & frost guide.
- Forgetting railings and stairs. On a raised deck they're a major line item, not an afterthought — guards and a staircase can rival the deck surface itself.
- Skipping the permit. Attached and raised decks almost always need one, and unpermitted work bites at resale and with insurance — see the permits guide.
The Safest Path Forward
- Decide DIY vs hire-out honestly — your skill and the deck's height decide more than your budget does.
- Pick your material by how long you'll keep the deck: PT to lead on cost, composite/PVC to buy back maintenance time.
- Price the foundation first with the calculator — it's the line DIYers most often get wrong.
- Add 15% contingency and confirm you're above the realistic floor before you order materials.
- Permit before you dig, and spend on the invisible things — footings, hardware, the ledger — first.
Bottom Line
For 2026, plan on about $15–$30/sq ft in materials to DIY a pressure-treated deck, and $45–$95/sq ft to have one built depending on material — with the labour you supply yourself accounting for nearly half the difference. Because the dominant cost driver shifts from deck to deck, skip the generic estimate: put your dimensions into the Deck Cost Calculator and build your budget from there.
Frequently Asked Questions
How much does it cost to build a deck in Canada in 2026?
About $35–$130 per square foot installed, depending on material and complexity. DIY brings that down a lot: a pressure-treated deck runs roughly $15–$30 per square foot in materials when you supply the labour.
Is it cheaper to build a deck yourself?
Yes — labour is roughly 40–50% of a built deck's cost, so a capable DIYer saves significantly. The foundation, the ledger connection, and any electrical are the parts worth getting professional help with, and most material warranties require professional installation.
What's the cheapest decking material?
Pressure-treated lumber, by a wide margin — it's the budget floor for both materials and installed cost. Cedar sits in the middle, and composite or PVC is the premium, costing roughly double pressure-treated in materials but eliminating staining and sealing.
What is the biggest cost in building a deck?
It varies by build. On a large ground-level deck the decking material dominates; on a tall or attached deck, framing, railings, and stairs do; and a hard-to-access site pushes labour up regardless. That's why pricing your specific deck beats any generic per-square-foot figure.