Repairing a Wooden Fence: Posts, Panels and Gates

A wooden fence rarely fails all at once. One post loosens, a panel rattles in wind, a gate starts to drag, and then a storm finishes the job. Repairing the weak parts early is usually cheaper and easier than replacing a whole run, and it keeps the fence looking tidy rather than patched in a hurry.

This guide covers common repairs to a standard wooden fence: leaning posts, broken panels, loose rails, and sagging gates. It does not cover fences acting as retaining walls, fences on a steep slope, or work near underground cables or pipes. If unsure what lies below, or if the fence supports soil, ask a qualified professional before digging.

Diagnose before you replace anything

Walk the whole fence line and check each post, panel, and gate in turn. Push each post gently at the top. A sound post should feel firm, with only a small amount of flex. A post that moves easily at ground level is usually rotten at the base or loose in its footing.

Look at each post base where it meets soil or concrete. Rot often shows as soft, crumbly wood, dark staining, or narrowing where it enters the ground. Probe gently with a screwdriver: sound wood resists, rotten wood lets it sink in. Check both sides, as rot can be worse on the damp side.

Check panels by lifting the bottom edge and looking at rails and fixings. A sound but loose panel may just need new screws; one with split rails or broken boards is usually better replaced than patched.

Check gates separately by opening and closing slowly, noting where it sticks, sags, or fails to latch. A dragging gate often has a loose hinge post, worn hinges, or a frame out of square, rather than a problem with the gate itself.

Make a list before you buy anything, noting:

• How many posts are loose or rotten at ground level
• How many panels, rails, and boards need replacing
• The approximate length of each run and the gap between posts

That list stops you buying the wrong size panel or too few screws.

Fix a leaning post

A leaning post is the most important repair, because it affects every panel attached to it. Remove the panels on both sides of the post, if safe, labelling them for refitting. Support neighbouring posts with a temporary prop if unstable, then dig around the old post to expose the footing. If it is set in concrete, you may need to break the concrete out with a spade and a breaker bar. This is heavy work, and for many posts, hiring help or a professional may be sensible. Do not try to straighten a rotten post and pack soil around it; it will lean again within months.

Set the new post in the same hole, or dig a new hole if the old one is too wide. A common guideline is to bury about one-third of the post length, with a minimum of 600 millimetres for a fence up to 1.8 metres high. Check it is plumb on two sides, and brace it with diagonal props while the footing sets.

For a concrete footing, follow the product instructions, keeping the top slightly above ground level and sloped away from the post so water runs off. Leave the post braced for at least 24 to 48 hours, longer in cold or wet weather, before rehanging panels.

If the post is sound but the footing has loosened, you may reset it by packing crushed stone and concrete around it. That only works if the wood at ground level is firm; if it is soft, replace the post.

Replace a panel or a broken rail

Panels are usually the easiest part to replace, because they are made to a standard size. Measure the gap between posts, not just the old panel, as posts can move slightly over time. A common panel width is 1.83 metres, but older fences vary, so measure twice.

Remove the old panel carefully: pull nails out rather than levering boards off, which can split the post. Fit the new panel with the top level with its neighbours, using screws rather than nails, as they hold better and are easier to remove later. Use at least two fixings per side, one near the top rail and one near the bottom rail, and check the panel is not twisted before tightening fully. If only a rail is broken, you may replace that rail by removing the boards over that section, fitting a new rail of the same size, and refixing the boards. That is more work than it sounds, so for a panel with several broken boards, replacing the whole panel is usually quicker and tidier. For a single broken board, a replacement board cut to size and screwed in place can be enough.

Repair a sagging or sticking gate

A gate sags because its frame twists, hinges wear, or its post moves. Start with the post: if the hinge post moves when pushed, fix it first, as no hinge adjustment will hold a gate on a loose post.

Next, check the hinges: tighten all screws, replace stripped ones with longer screws reaching sound wood, and if a hinge is bent or rusted through, replace both as a pair so the gate hangs evenly.

Check the frame for squareness by measuring diagonally from corner to corner. If the two measurements differ by more than about 10 millimetres, the frame has twisted. A diagonal brace, fitted from the bottom hinge corner to the top latch corner with screws, can pull a wooden gate back into square. Adjust the latch last, after the gate hangs level, leaving a small, even gap of typically 5 to 10 millimetres so it does not stick when wood swells in wet weather. If a gate is very heavy, or needs a new post in concrete, consider whether the job is within your strength and tools.

Protect the repair so it lasts

Once the fence is straight and panels are secure, protect the wood. Clean off loose paint, algae, and dirt with a brush and water, let the wood dry fully, then apply a suitable exterior treatment or stain, following the product instructions. Pay attention to post bases and board end grain, where water soaks in most easily. Keep soil, mulch, and planting away from the base, leaving a gap of about 50 millimetres between soil or mulch and the bottom of boards, so air can circulate and wood can dry. Check the fence each spring and after storms, tightening screws and clearing vegetation that pushes against panels.

For the ground beside the fence, a tidy path can reduce mud and wear. The garden paths guide explains surfaces that work well beside a fence line, and the budget patio guide covers base preparation that uses similar principles.

Common mistakes

The most common mistake is fixing a panel to a rotten post: it will lean with the post within a season. Always check posts first.

Another mistake is using too few or too short fixings: a panel held by one screw per side will rattle and work loose. Use at least two solid fixings per side, into sound wood.

A third mistake is setting a new post without bracing it: it can drift as concrete sets, especially if panels are hung too soon. Brace it, check it again, and wait.

Finally, do not bury a fence base in soil or mulch to hide a gap, as that traps moisture and speeds up rot. Leave a small air gap, even if it looks less tidy at first.

When to replace a run instead of repairing it

Repair is sensible when most posts are sound and only one or two panels are damaged. Replacement is usually better when most posts are rotten at ground level, or the fence line has moved significantly; replacing a whole run then gives a straighter, stronger result than patching post by post.

If you are unsure, cost a run replacement honestly against repeated small repairs over two years. A run needing a new post every few months is often a run that should be replaced.

A well-repaired fence needs to stand straight, close properly, and stay firm. Fix the posts, fit panels squarely, hang the gate level, and protect the wood.