How long does a pressure-treated wood fence last in Metro Vancouver before needing replacement?

A pressure-treated wood fence in Metro Vancouver typically lasts 15–25 years before full replacement, but only if it's properly installed, sealed regularly, and maintained — without that care, you can expect significant deterioration in as little as 8–12 years.

Metro Vancouver's marine climate is genuinely hard on wood fencing. With over 1,200mm of annual rainfall and humidity that rarely drops low enough to fully dry out fence components, pressure-treated wood faces constant moisture stress. The chemical treatment (typically alkaline copper quaternary, or ACQ, in modern lumber) protects the wood fibres from rot and insect damage, but it does not prevent surface weathering, checking (surface cracking), or the gradual breakdown of wood fibres from UV exposure and freeze-thaw cycling. What the treatment buys you is time — and how much time depends almost entirely on how well the fence is installed and maintained.

The Biggest Factor: Post Installation

The posts are where pressure-treated fences fail first in Metro Vancouver, and they almost always fail at or just below the soil line. This is the zone where moisture is most concentrated, oxygen is limited, and the wood stays wet for extended periods. Even with chemical treatment, posts set directly in clay-heavy soil — common throughout Surrey, Delta, and Burnaby — will begin to soften at the base within 10–15 years. The fix is simple but often skipped: a 4–6 inch bed of drainage gravel below the post base, with concrete poured above. This allows water to drain away from the wood rather than pooling around it. Posts installed this way consistently outlast posts set in concrete alone by 5–10 years in Vancouver's conditions.

Post depth also matters enormously. A 6 ft fence post needs to be set at least 2 feet into the ground — ideally 2.5 feet in soft or wet soil. Shallow posts lean and fail structurally long before the wood itself rots out, which is a frustrating and avoidable failure mode.

Maintenance Is Non-Negotiable

Pressure-treated wood is not a set-it-and-forget-it material in Metro Vancouver. New PT lumber needs to dry out for 3–6 months after installation before it will accept a stain or sealer — trying to seal it too early traps moisture inside. Once it's ready, apply a quality penetrating wood sealer or semi-transparent stain, and plan to reapply every 2–3 years. North-facing fence sections and panels under tree canopy will need attention more frequently because they stay damp longer and accumulate moss and algae faster.

Moss and algae growth is extremely common on fences in shaded Vancouver yards. Left unchecked, the biological growth traps moisture against the wood surface and accelerates surface degradation. A pressure wash in early spring followed by a diluted bleach or oxygen bleach solution, then a fresh coat of sealer once the wood dries, is the standard maintenance cycle that keeps a PT fence looking good and performing well.

What Replacement Actually Looks Like

In practice, most Metro Vancouver homeowners don't replace an entire pressure-treated fence at once. The boards and rails typically outlast the posts by several years. A common scenario is a fence that's 12–15 years old with sound boards but posts that are starting to lean or soften at the base. Replacing individual posts — which runs $150–$400 per post including extraction of the old concrete footing — can extend the fence's life by another 5–8 years without a full replacement. Full replacement of 100 linear feet of pressure-treated fence runs $3,000–$6,500 in the current Metro Vancouver market.

If longevity with lower maintenance is a priority, Western Red Cedar is worth the 30–50% premium — its natural oils provide built-in rot resistance that PT lumber can't match, and it performs better in Vancouver's specific climate over a 20–25 year lifespan. Vinyl is the other strong option if you want to eliminate maintenance almost entirely.

Need help finding a fence contractor for a replacement or repair estimate? Vancouver Fence Builders can match you with local professionals for free through the Vancouver Construction Network.