Deck construction cost in Ottawa scales primarily by square footage, material choice, height above grade, and complexity (railings, stairs, multi-level designs). This guide provides 2026 pricing by deck size from compact 100 sq ft platforms to expansive 600+ sq ft outdoor living spaces.
Ottawa deck pricing by size in 2026 (pressure-treated lumber baseline): 100 sq ft deck: $4,500-$7,500. 200 sq ft deck: $8,500-$13,500. 300 sq ft deck: $12,500-$19,500. 400 sq ft deck: $16,500-$25,500. 600 sq ft deck: $24,500-$38,500. Composite decking (Trex, TimberTech, AZEK) adds 50-90% to the materials cost: 200 sq ft composite deck: $14,500-$22,500. 400 sq ft composite deck: $26,500-$42,500. Cedar adds 30-50% to PT pricing.
Cost drivers in deck construction: (1) Decking material — PT lumber is the budget baseline; cedar adds 30-50%; composite (Trex/TimberTech) adds 50-90%; tropical hardwoods (ipe, mahogany) add 100-200%. (2) Height above grade — decks under 24" sit on simple deck blocks ($800-$1,500 in footings); decks above 24" require concrete footings to 1.5m frost depth ($1,500-$3,500 in footings); decks above 1.8m require engineered drawings ($800-$1,500 in engineering). (3) Railings — required on any deck abo...
Detailed breakdown for a typical $19,500 300 sq ft PT deck in Ottawa: Materials (PT decking, framing, fasteners): $5,500-$8,500. Labour (footings, framing, decking, railings, stairs): $8,500-$11,500. Permit fee: $260-$400. Concrete footings (8-10 footings at 1.5m depth): $1,200-$2,200. Stairs (4-step stair to ground): $1,000-$1,500. Disposal of old deck (if applicable): $400-$800. Equipment (mini-excavator for footings if needed): $300-$600. HST: $2,300-$2,500.
Cost control for deck construction: (1) Choose PT lumber unless aesthetic specifically requires upgrade — PT is the most cost-effective decking material in Ottawa's climate when properly maintained. (2) Limit deck height to under 24" where possible — eliminates railing requirement and reduces footing complexity. (3) Use stock railing systems rather than custom — savings of $1,500-$4,500 on a typical deck. (4) Build in early or late season — May and September typically have better pricing than pe...
Costs vary by Ottawa neighbourhood due to property type complexity, lot access, and contractor positioning. Premium neighbourhoods (Rockcliffe Park, The Glebe, Old Ottawa South, Westboro, New Edinburgh) typically run +15-25% above the medians cited above. Mid-range neighbourhoods (Kanata Lakes, Manotick, Findlay Creek, Riverside South) align with median. Value neighbourhoods (Orleans south, Barrhaven east, Carlington) run -5% to -10% from median. Heritage-designated properties carry additional 1...
For accurate Ottawa pricing on deck cost by size, request quotes from at least 3 contractors using a detailed scope brief. Quotes within 15% of each other usually reflect well-calibrated market pricing. Quotes 25%+ below the others typically indicate scope cuts or under-insurance issues. Always verify the contractor against our 27-item vetting checklist before signing.
Ottawa deck pricing by size in 2026 (pressure-treated lumber baseline): 100 sq ft deck: $4,500-$7,500.
Cost drivers in deck construction: (1) Decking material — PT lumber is the budget baseline; cedar adds 30-50%; composite (Trex/TimberTech) adds 50-90%; tropical hardwoods (ipe, mahogany) add 100-200%.
Cost control for deck construction: (1) Choose PT lumber unless aesthetic specifically requires upgrade — PT is the most cost-effective decking material in Ottawa's climate when properly maintained.