How much does it cost for a second floor deck in new brunswick?

A second-floor deck in New Brunswick typically runs $15,000–$45,000+, depending on size, materials, and structural complexity — and because it's elevated, this is firmly in "hire a professional" territory.

Here's how the pricing breaks down in the NB market:

Pressure-treated wood remains the most common and affordable option — expect $150–$250 per square foot installed for a second-floor structure. A modest 200 sq ft deck lands around $30,000–$50,000 once you factor in the ledger board connection, posts, footings, and guardrails. Composite decking (Trex, TimberTech, etc.) adds $20–$40 per square foot to material costs but dramatically reduces long-term maintenance — worth considering given NB's freeze-thaw cycles and coastal moisture in areas like Saint John or Shediac.

The big cost driver on a second-floor deck versus a ground-level one is the structural work underneath. You need engineered posts, beams, and footings that extend below NB's frost line (minimum 1.2m/4 feet, deeper inland toward Fredericton and Woodstock). That substructure alone can represent 40–50% of your total project cost.

Permits are mandatory for this type of project. A second-floor deck is a structural addition and requires a building permit — from your municipality if you're in an incorporated area (City of Moncton at 506-856-4375, City of Fredericton at 506-460-2020, City of Saint John at 506-658-2835, etc.) or from your Regional Service Commission if you're in a rural area. Under the National Building Code of Canada 2020 (mandatory in NB as of May 1, 2025), guardrails on decks more than 600mm above grade must be at least 1,070mm high with balusters spaced no more than 100mm apart — non-negotiable for safety and inspection sign-off.

A few other cost factors specific to NB:

• Ledger attachment to the house — if your home has wood framing, this is straightforward. If it's older brick or stone (common in Saint John's heritage neighbourhoods or Fredericton's older areas), flashing and waterproofing become more complex and expensive
• Stair configuration — a single straight stair run adds $2,000–$5,000; an L-shaped or switchback stair adds more
• Railings — basic pressure-treated wood balusters are cheapest; cable railing or glass panel systems can add $5,000–$15,000
• Seasonal timing — concrete footings can't be poured below -10°C, so your best window is May through September in NB

This is not a DIY project. The structural connections, footing depth calculations, and guardrail requirements all need to meet NBC standards and pass inspection. A deck failure at height is a serious safety risk.

Your next step: Get two or three quotes from licensed contractors and confirm your permit requirements before anyone breaks ground. You can browse deck builders and general contractors in your area through the New Brunswick Construction Network directory at newbrunswickconstructionnetwork.com/directory — and ask each contractor for their WorkSafeNB clearance certificate before signing anything.