How much does annual deck maintenance cost in New Brunswick?

Annual deck maintenance in New Brunswick typically costs $300–$1,200 per year depending on your deck material, size, and whether you DIY or hire a professional.

The biggest driver of maintenance costs in NB isn't the size of your deck — it's the material. Pressure-treated and cedar decks require annual or biennial attention because of our brutal freeze-thaw cycles (100+ per year), Maritime humidity, and UV exposure. Composite and PVC decks, on the other hand, drop your annual maintenance cost to nearly zero beyond a basic cleaning.

Pressure-Treated or Cedar Decks

These are the highest-maintenance options in NB's climate. Every spring you should power wash the surface to remove mildew and winter grime, then inspect for cracked boards, loose fasteners, and any signs of rot — especially around the ledger board and post bases. Staining or sealing is required every 2–3 years for PT lumber and closer to every 1–2 years for cedar given how hard our climate is on wood.

A professional power wash and stain on a typical 200 sq ft deck runs $600–$1,200 when you hire it out. DIY brings that down to $150–$350 (power washer rental + a quality exterior stain at $40–80/gallon). Factor in occasional board replacement — a few cracked or cupped boards after a hard winter — and budget an extra $100–$300 every few years for materials.

Composite Decks

Composite decks are the fastest-growing choice in NB for exactly this reason — annual maintenance is minimal. A good cleaning with a composite-approved cleaner and a garden hose or low-pressure washer is all most homeowners need. Annual cost: $50–$150 DIY, or $200–$400 if you hire someone for a professional wash. No staining, no sealing, ever.

Timing Matters in NB

Always schedule your staining and sealing between mid-May and September, when temperatures are consistently above 10°C. Applying stain in cool or damp conditions — common in NB shoulder seasons — leads to poor adhesion and premature peeling, meaning you'll be redoing the work sooner than expected. Spring is also the right time to do your structural inspection before the deck sees heavy summer use.

Practical tips to keep costs down: Buy a quality penetrating stain (Armstrong Clark and Defy are popular in NB) rather than a film-forming product — penetrating stains don't peel, so prep work is far easier next time around. Keep your deck clear of leaf buildup in fall, which traps moisture against the boards all winter. And address small repairs immediately — a $15 replacement board today prevents a $500 rot repair next spring.

If you're spending more than a few hundred dollars a year on maintenance and the work is becoming a burden, it may be worth pricing out a composite replacement. Many NB homeowners find the math works out within 8–10 years when you factor in saved labour and materials.

Need help finding a local deck builder for maintenance, repairs, or a material upgrade? New Brunswick Decks can match you with a local contractor for free.