Deck Building Cost in Laval

What changes the price in Laval

In Laval, Quebec, a standard-quality deck renovation typically costs between $9,790 and $22,695 in 2026 — prices are below the Canadian average, with a local cost index of 89%. Expect around 1 to 3 weeks of work and a 65–75% return on investment at resale. Footings must extend below the frost line (typically 4–5 ft) — skipping helical piles or pressure-treated sonotubes is the number one cause of premature deck failure.

What’s specific to Laval decks

Laval decks are built for frost and snow like everywhere in Québec: footings or helical piles below the frost line, structure sized for the local snow load. Pressure-treated wood is the budget standard, composite the premium tier, and the newer suburban sectors lean composite. The city's permit table tells you whether your deck needs a permit; ask before ordering piles.

Permits and rules in Laval

Authority: Ville de Laval, "Trouver mon permis"

• A contractor doing renovation work for a client in Québec must hold an RBQ licence in the relevant subcategory, whatever the size of the job. Only an owner-occupant doing the work alone is exempt. Check the licence in the RBQ register before signing. Régie du bâtiment du Québec
• Contractor invoices in Québec carry GST 5 % plus QST 9.975 %, 14.975 % in total. Revenu Québec
• The Office de la protection du consommateur advises a written contract that describes the work, the materials by type and quantity, the start and end dates, the total price and the contractor’s liability insurer, a small deposit only, and no final payment before the work is finished to your satisfaction. Office de la protection du consommateur
• In a divided co-ownership, work on common elements (roof, façade, balconies, party walls) goes through the syndicate, which since 14 August 2025 must hold a reserve-fund study renewed every five years by an independent professional; a special assessment may be how your share of a major job gets paid. Gouvernement du Québec — copropriétés divises

Guide: Renovating in Québec: licences, taxes, permits and programs (2026)

What to ask the contractor before you sign

• Check the contractor’s RBQ licence in the online register: the number, the subcategories, and that it is active. No licence, no contract.
• Ask for proof of liability insurance and, where it applies, workers’ compensation coverage, dated within the year.
• Get a written contract that lists the scope, the materials by brand and grade, the schedule, and what is excluded.
• Agree on a deposit that matches materials ordered, not a share of the whole job, and tie further payments to milestones you can see.
• Ask who pulls the permit, who schedules inspections, and whether the quote includes the permit fee.
• Compare three quotes on the same written scope; the cheapest one usually left something out.
• Ask for two recent references for the same kind of job, and call them.

Frequently asked questions