Adding a deck is one of the most popular home improvement projects in North America — and for good reason. It adds usable living space, boosts curb appeal, and delivers solid return on investment. Here’s what a deck addition realistically costs in 2026.
Deck Addition Cost at a Glance
| Deck Size | Pressure-Treated Wood | Composite Decking |
| Small (100–200 sq ft) | $3,000 – $7,000 | $5,000 – $12,000 |
| Medium (200–400 sq ft) | $6,000 – $15,000 | $10,000 – $25,000 |
| Large (400–600 sq ft) | $12,000 – $25,000 | $20,000 – $40,000 |
The average homeowner spends $7,000 to $17,000 for a new deck. A medium-sized composite deck runs $15,000–$20,000 fully installed.
Pressure-Treated Wood vs. Composite
Pressure-Treated Wood
The most affordable option. Pressure-treated pine resists rot and insects and is widely available. It requires staining or sealing every 2–3 years. Lifespan: 15–25 years with maintenance.
Composite Decking
Made from wood fibres and recycled plastic. Higher upfront cost but virtually maintenance-free — no staining, sealing, or splinters. Premium brands (Trex, TimberTech, Fiberon) carry 25–30 year warranties.
Hardwood (Ipe, Cedar, Redwood)
Natural hardwoods offer a premium look and durability at $25–$45/sq ft installed. Cedar and redwood are naturally rot-resistant; Ipe is exceptionally hard and long-lasting.
What Affects the Total Cost?
| Cost Factor | Low Estimate | High Estimate |
| Deck boards (materials) | $3 – $8/sq ft | $15 – $30/sq ft |
| Framing & substructure | $2 – $5/sq ft | $5 – $10/sq ft |
| Labour (installation) | $5 – $10/sq ft | $15 – $25/sq ft |
| Railing system | $30 – $50/linear ft | $80 – $150/linear ft |
| Stairs (per step) | $50 – $100 | $150 – $300 |
| Permits | $100 – $300 | $500 – $1,500 |
| Built-in seating/features | $500 – $2,000 | $3,000 – $8,000 |
Do You Need a Permit?
In most municipalities, yes. Any deck attached to the house or above 30 inches off the ground typically requires a building permit. A reputable contractor will pull permits on your behalf — be wary of any contractor who suggests skipping this step.
Return on Investment
A wood deck typically returns 60–70% of its cost at resale; composite decks return 65–75%. In markets with strong outdoor living culture, the ROI can be higher. Beyond resale, the quality-of-life improvement is immediate.
Tips to Save Money
- Keep the shape simple — rectangular decks cost significantly less than L-shapes, curves, or multi-level designs
- Choose pressure-treated wood if you’re willing to do annual maintenance — the upfront savings are real
- Get quotes from at least 3 deck builders — pricing varies enormously for identical jobs
- Build in autumn or winter — contractors often discount work during slow season
- Limit the railing length — railing is one of the most expensive per-linear-foot items
Get Your Personalised Estimate
Use our free remodel cost calculator to get a realistic deck addition estimate based on your backyard size, material preferences, and location.
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