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Decks · Pressure-Treated · Hamilton
Pressure-Treated Deck Builders in Hamilton & Burlington
Pressure-treated wood is Ontario’s most common and most affordable deck material. Typical Ontario installed ranges (2026) are $45–$65 per sq ft, with an approximate 15–20 year lifespan when it is installed and maintained properly.
How a deck is built, from footings to railing
Shown: Ground-level deck — Step 1 of 5 — Footings
- Footings or helical piles reach below the frost line so the deck can't heave in winter.
- Posts carry the load up from the footings.
- Beams and joists frame the structure under the boards.
- Decking boards and a picture-frame border finish the walking surface.
- A black metal safety railing (guard) goes up last, where required.
Est. 2020Footings below frostPermit drawings handledDeck + landscape design
Quick answer
Pressure-treated wood is Ontario’s most common and most affordable deck material. Typical Ontario installed ranges (2026) are $45–$65 per sq ft, with an approximate 15–20 year lifespan when it is installed and maintained properly. Your exact price comes from an on-site quote.
Fit before finish
Is this deck right for you?
May not suit
- Owners who want no periodic staining or sealing
- A perfectly uniform surface without natural checking
- Projects where boards must be coated immediately
Profiles & details
Styles and options
Ground-level platforms
Simple, generous layouts make useful dining and lounge zones close to the lawn.
Wide stair landings
Broad steps connect the deck naturally to grass or an interlock patio.
Stained picture frame
A darker perimeter can give practical lumber a more tailored finish.
Future-ready framing
Correct joist spacing and sound structure preserve the option to resurface later.
Balanced guidance
Honest pros & considerations
Advantages
- Lowest deck market range in the research brief
- Readily available and adaptable to many layouts
- Comfortable natural-wood feel underfoot
- Also serves as standard structural framing beneath many composite decks
Considerations
- Checking, splitting and some warping are normal outdoor-wood behaviour
- Ground-contact and above-ground rated lumber serve different locations
- Fresh boards need time to dry before the first stain or sealer
- Periodic cleaning and refinishing protect appearance
Typical Ontario installed range (2026)$45–$65 / sq ft
Approximate lifespan15–20 years
MaintenanceRegular cleaning and refinishing
Feel & heatNatural wood; comfortable underfoot
Material decision
Compare the closest alternatives
Pressure-Treated Wood
Lifespan 15–20 yrs
Maintenance Regular staining/sealing
Cost band $$ · $45–$65/sq ft
Look: Classic wood, stains to suit
Heat & comfort: Stays comfortable underfoot; needs regular sealing
Cedar
Lifespan 15–25 yrs
Maintenance Regular staining/sealing
Cost band $$$ · $55–$80/sq ft
Look: Warm natural grain
Heat & comfort: Natural wood feel; softer surface can mark
Lifespans are approximate, with proper installation and maintenance. Prices are typical Ontario installed ranges (2026); your exact price comes from an on-site quote.
Planning range
Estimate your deck
Estimated range for ~192 sq ft$13,340 – $21,480
- Deck surface: $8,640–$12,480
- Stairs: $1,500–$3,000
- Railing: $3,200–$6,000
Raised decks need guards above 600 mm, taller posts and bracing, which push the per-sq-ft rate up. Confirmed on site.
Per-sq-ft rates usually drop as decks get larger; height, stairs, railings and complex shapes push them up.
Typical Ontario installed ranges (2026), not a quote. Your exact price comes from a free on-site visit.
Below the surface
How we build pressure-treated decks
A value-led surface still deserves a serious structure. We match the lumber rating to its location, establish drainage and footings below frost, then frame for the board direction and any future resurfacing plan.
- 01
Confirm setbacks, deck height and permit path before excavation
- 02
Use ground-contact-rated lumber where the assembly requires it
- 03
Set concrete piers or helical piles below local frost depth
- 04
Flash and fasten the ledger correctly, or use a freestanding design
- 05
Set joist spacing for today’s boards and the realistic future surface
- 06
Install boards with movement, drainage and stair geometry in mind
What's inside a deck, from the ground up
Everything below the boards — footings, posts, beams and joists — is what keeps a deck safe and level for decades; click a layer to see why it matters.
- Native soil: Undisturbed native soil carries the load. Topsoil and fill are not used as bearing.
- Frost line (~1.2 m): Footings must bear below frost depth — about 1.2 m / 4 ft in this region — so freeze–thaw can't heave the deck.
- Pier or helical pile: Concrete piers are poured below frost; helical piles are screwed down to bearing depth with little excavation and can be loaded right away.
- Post + bracket: Posts sit in a bracket on the footing so they stay dry and positively connected.
- Beam: Beams gather joist loads and carry them to the posts.
- Joists + joist tape: Pressure-treated joists; on composite and PVC builds we add joist/beam protection tape to shed water from the tops.
- Ledger + flashing / freestanding: An attached deck needs a properly fastened and flashed ledger. A freestanding design uses its own beam instead of the house.
- Decking, fasteners, gapping: Hidden fasteners and correct gapping on composite/PVC let boards drain and move with temperature.
- Guard: 900 / 1,070 mm + 100 mm sphere: Guards are required above 600 mm. Minimum 900 mm high up to 1.8 m above grade, 1070 mm above that; openings must stop a 100 mm sphere.
- Stair stringers: Stairs must meet Ontario Building Code rise/run and handrail rules; we frame them to code with solid landings.
2. Frost line (~1.2 m)
Footings must bear below frost depth — about 1.2 m / 4 ft in this region — so freeze–thaw can't heave the deck.
Ownership timeline
Care & maintenance
Let the lumber dry
Wait until the boards are ready to accept finish; weather, exposure and moisture determine timing.
Clean and inspect
Clear debris, check fasteners, stairs and guard connections, and look for trapped moisture.
Renew the finish
Re-stain or seal as exposure and product guidance require rather than waiting for deep weathering.
Hamilton · Burlington · Oakville
Permits and guard requirements
Hamilton
Any attached deck needs a permit. New or replacement guards also require a permit. Building Division: 905-546-2720.
Burlington
Attached decks and decks more than 600 mm above grade or over 10 m² commonly need a permit. Confirm with City of Burlington Building.
Oakville
Any attached deck needs a permit; detached decks over 10 m² and higher than 61 cm above grade also need one.
Confirm current requirements with your municipality before building.
Review the complete deck permit guide →Planning guides
Deck guides for homeowners
Type-specific answers
Pressure-Treated FAQ
When should a new pressure-treated deck be stained?
Let the lumber dry enough to accept the chosen finish. Weather, sun exposure and board moisture matter more than a fixed number of days; follow the finish manufacturer’s preparation guidance.
Why do pressure-treated deck boards crack or split?
Checking and small splits are normal as outdoor lumber loses moisture. Correct fastening and board selection limit distortion, but wood will still move through Ontario seasons.
Is pressure-treated wood better than cedar?
Pressure-treated wood has the lower typical installed range. Cedar is lighter, more stable and naturally resistant, and is often selected for its warmer grain.
Can composite boards be installed later?
Sometimes, if the existing frame is sound and its joist spacing suits the selected boards. Diagonal layouts often need tighter joist spacing, so future resurfacing should influence the original frame.
How long does a pressure-treated deck last in Ontario?
Approximately 15–20 years with proper installation and maintenance. Drainage, finish care, ventilation and structural details affect service life.
Is pressure-treated lumber safe around children and pets?
Residential pressure-treated lumber is commonly used outdoors. Follow manufacturer guidance, contain cutting dust and keep food-preparation surfaces separate from treated wood.
Local deck building
Hamilton, Ancaster, Burlington & Oakville
Hamilton
Hamilton MountainAncasterDundasStoney CreekWaterdownBinbrookFlamboroughWestdaleKirkendallGlanbrook
Burlington
AldershotBrant HillsTyandagaMillcroftApplebyLaSalle
Oakville
BronteGlen AbbeyRiver OaksPalermoOld OakvilleKerr Village
Start on site
Plan your pressure-treated deck.
Share the approximate size, height, stairs, railings and city. We’ll arrange a free on-site design consult and exact quote.