Why does my Vancouver gate sag after one winter?

Gate sag after one winter is almost always caused by undersized posts, inadequate footings, or hardware that wasn't built for the weight and leverage a gate generates. Vancouver's wet winters accelerate every weakness in a gate installation — what might take three years to fail in a drier climate can show up after a single rainy season here.

The Real Culprit: Post Movement

The gate post is the foundation of everything. When a gate post shifts even a few millimetres — tilting, sinking, or rotating — the gate drops on the latch side and starts dragging or failing to close properly. In Metro Vancouver's clay-heavy and consistently saturated soils, posts that weren't set deep enough or anchored with enough concrete will move. A gate post needs to be set a minimum of 2.5 to 3 feet deep, in concrete, with a gravel drainage bed below the post base. If your installer set the post 18-24 inches deep (common on quick jobs), winter soil saturation and frost heave will shift it. The post also needs to be 6x6 lumber minimum — a 4x4 post simply doesn't have the mass to resist the constant lateral torque a swinging gate applies over thousands of cycles.

Hardware Failure in Wet Conditions

The second major cause is hardware — specifically hinges that are too small for the gate's weight, or fasteners that have already begun to rust and lose their grip. A 6-foot cedar gate panel can weigh 80 to 150 pounds. Strap hinges rated for interior doors or light garden gates will bend under that load within months. In Metro Vancouver's climate, any hardware that isn't hot-dipped galvanized or stainless steel will begin corroding almost immediately, and corroded fasteners lose holding strength fast. If you can see rust streaking down from your hinge screws, that's your answer — the screws are failing and the hinge is pulling away from the post.

Wood Movement and Frame Racking

Cedar and pressure-treated wood absorb moisture during Vancouver's wet season and expand, then dry and contract in summer. A gate frame that wasn't built with a diagonal brace (running from the top hinge corner down to the bottom latch corner) will rack — the frame parallelograms under its own weight and the gate drops. This is a structural issue with the gate itself, not just the post. A properly built gate frame always includes a diagonal tension rod or solid wood brace to counteract this racking force.

What You Can Do Now

If the sag is minor, adjusting the hinge positions (moving the top hinge slightly upward or the bottom hinge slightly outward) can temporarily correct the drop. Anti-sag gate kits — a cable and turnbuckle system that runs diagonally across the gate — are available at most Metro Vancouver hardware stores for $20-$40 and can buy you a season. But these are fixes for a frame problem, not a post problem. If the post itself is leaning or rotating, the gate needs to come off, the post needs to be reset properly, and the gate frame should be rebuilt with correct bracing.

A post replacement in Metro Vancouver runs $150-$400 per post including extraction of the old concrete footing, new 6x6 post, proper concrete and gravel drainage, and reattachment of the gate. It's worth doing properly rather than fighting a leaning post with adjustments every spring.

When to Call a Pro

If the post is visibly leaning, if the concrete footing has cracked or heaved, or if the gate frame itself has racked beyond adjustment, this is a professional repair. Extracting old concrete footings and resetting posts requires equipment and experience — a DIY attempt often results in a post that's slightly out of plumb, which means the gate will sag again within a year. Vancouver Fence Builders can match you with a local fence contractor for a free assessment — find one through the Vancouver Construction Network at vancouverconstructionnetwork.com.