How much does a Deck Builder cost in Montreal in 2026?

What's Involved

Building a deck involves designing the structure, obtaining permits, installing footings or piers, constructing the frame (posts, beams, joists), laying decking boards, and adding railings and stairs. In Canada, decks are regulated structures — they must meet provincial building code requirements for structural capacity, railing height, baluster spacing, and footing depth.

Footings must extend below the frost line, which varies by region. In Montreal, this can mean digging 4-5 feet deep for concrete piers, or using helical screw piles as an alternative. The substructure is typically pressure-treated lumber, while the decking surface can be pressure-treated wood, cedar, or composite materials.

A well-built deck extends your living space and adds resale value. Most Canadian homeowners choose between a simple rectangular platform deck and a more complex multi-level design with built-in seating, lighting, or a pergola.

Factors That Affect Cost

• Decking material — Pressure-treated wood ($25-$40/sq ft installed) vs. cedar ($35-$55) vs. composite ($45-$75).
• Deck size — A typical 12x16 ft deck (192 sq ft) vs. a large 16x20 ft deck (320 sq ft).
• Height and complexity — Ground-level decks cost less than elevated second-story decks requiring additional structural support.
• Railings — Wood ($20-$40/linear ft) vs. aluminum ($40-$80) vs. glass ($80-$150).
• Footing type — Concrete sonotubes ($80-$150 each) vs. helical piles ($150-$300 each).
• Permits and engineering — Required in most municipalities; permit fees range from $100-$500 in Montreal.
• Stairs and landings — Each stair section adds $500-$2,000 depending on height and material.

How to Save Money

1. Choose pressure-treated lumber for the best value — it lasts 20-30 years with proper maintenance.
2. Keep the design simple and rectangular — angles, curves, and multi-levels add significant labour.
3. Build during the off-season (late fall or early spring) when contractors in Montreal may offer better pricing.
4. Get three detailed quotes comparing material quality, fastener type, and warranty terms.
5. Consider a ground-level floating deck if your yard is flat — it avoids deep footings and may not require a permit in some municipalities.

Hiring Tips

1. Ensure the contractor pulls a building permit — unpermitted decks create liability and resale problems.
2. Verify they carry liability insurance and workers' compensation (WSIB/WCB).
3. Ask for engineered drawings if the deck is elevated or attached to the house — most building departments require them.
4. Check that they use code-compliant hardware: joist hangers, post bases, and ledger board flashing.
5. Request references from recent deck builds in Montreal and inspect the work in person if possible.

FAQ

How much does deck building cost in Montreal?

A 200 sq ft pressure-treated wood deck costs $5,000-$8,000. Cedar decks run $7,000-$11,000 for the same size. Composite decking ranges from $9,000-$15,000. Larger or elevated decks with premium railings can exceed $20,000-$40,000.

Do I need a permit for a deck in Montreal?

Yes, in virtually all Canadian municipalities. Decks attached to the house or elevated more than 24 inches above grade require a building permit. Some jurisdictions also require permits for ground-level decks. Your contractor should confirm requirements with the local building department in Montreal.

How long does it take to build a deck?

A straightforward 200 sq ft deck takes 3-5 days. A larger or multi-level deck with stairs and custom railings takes 1-2 weeks. Permit approval may add 1-4 weeks to the overall timeline in Montreal.