Start with the symptom, then find the cause
Most gate and fence troubles show the same few symptoms. The trick is that the visible symptom is often not the real problem. A latch that will not catch may really be a sagging gate; a leaning panel may really be a loosened post. Look at the whole assembly before reaching for tools.
A gate that sags or drags
What you see: the latch side drops, the bottom corner scrapes the ground or the gap along the top is wider on one side.
Likely causes: a hinge post that has leaned toward the gate’s weight, loose hinge screws, worn hinges, or a frame that has gone out of square.
Simple fixes, in order:
- Tighten every hinge screw. If the holes are stripped, use longer screws that reach solid wood, or fill the hole with glue and wooden dowel pieces before re-driving.
- Check the hinge post. Push on it; if it moves or leans, the post is the real issue.
- For wooden gates, add a diagonal brace running from the bottom of the hinge side up to the top of the latch side, so the brace is under compression. Anti-sag kits do something similar with a cable and turnbuckle. The article on gate bracing goes into the options.
- For heavy or wide gates, a support wheel can take weight off the hinges.
If the post has rotted at the base or is badly out of plumb, fix the post first. Re-hanging a gate on a failing post does not last.
A latch that sticks, misses or will not hold
Likely causes: the gate has dropped slightly so latch and keeper no longer line up, swelling from moisture, rust, debris in the mechanism, or worn parts.
Fixes:
- Re-check alignment by closing the gate and looking at where the latch meets its catch. Often the keeper just needs to be moved a small distance.
- Clean the mechanism and apply a lubricant suitable for outdoor hardware.
- Replace a worn latch. Gate latch types differ in how well they tolerate small misalignments, and gravity or magnetic styles can be more forgiving than a simple thumb latch.
- On gates near pools or play areas, use a latch designed to be hard for small children to open, and do not remove it because it is inconvenient.
Rot in wood
What you see: soft, dark, crumbly or spongy wood, usually at post bases, the bottom edges of boards, rail ends and joints where water collects.
Test: press a screwdriver into the wood. If it sinks in easily, the wood has lost strength.
Fixes: replace boards or rails that are soft. Small surface decay on a sound post can sometimes be cut back and treated with a wood hardener or preservative made for the job, though this is a stopgap. A post that is soft below grade usually needs replacement. The article on rotted fence boards covers swapping them out. Afterward, address the cause: poor drainage, soil piled against wood, plants holding moisture, or missing end-grain protection. Wood-boring insects can look like rot, so see wood-boring insects if you find tiny holes or fine sawdust.
Rust on metal
What you see: orange-brown flaking, bubbling paint, or staining running down from joints.
Fixes: surface rust can be removed with a wire brush or sanding, followed by a rust-inhibiting primer and a topcoat. Fence rust removal covers the process in more detail. If rust has eaten through the metal, or has weakened a weld or hinge mount, plan to replace or professionally repair that part. Wear eye protection and a dust mask when sanding, and be careful with old paint, which can contain lead in older homes; if you suspect that, look up safe handling for your area before sanding.
For hardware in wet or coastal climates, corrosion-resistant hardware is worth the extra cost over standard fasteners.
Leaning or wobbly posts
Likely causes: soil erosion, decay at the base, shallow setting, a loosened concrete footing, repeated wind, or frost heave in cold climates.
Fixes:
- A post that is loose but sound can sometimes be braced temporarily, re-plumbed and re-set with fresh compacted gravel or concrete. The how-to for a leaning fence post walks through that.
- If the post has rotted, replace it.
- If posts keep shifting, consider whether the footing is deep and wide enough. Post footings and post depth affect how well a fence resists movement.
- Look for the underlying cause, such as a downspout dumping water at the post or a tree root pushing it over.
Utility lines may be buried near posts, so use utility locating before digging, and check that you are not working near a neighbor’s property line.
Loose, split or warped boards
Loose boards usually need new fasteners, not more of the same. Ordinary nails can back out as wood changes with the seasons, so screws or ring-shank nails often hold better. See fence fasteners for choosing hardware that will not rust and stain. Warped boards can sometimes be pulled back with screws if the warp is mild; severe warping usually means replacement.
Gaps and alignment
Gaps that open or close unevenly between gate and post suggest movement somewhere. Check whether the post is leaning, whether the hinges have loosened, and whether the ground has settled or heaved. Fix the cause before adjusting the latch.
Automatic gate faults
If a motorized gate stalls, jerks, makes unusual noises, ignores remotes or reverses unexpectedly, treat it differently from a manual gate. Basic checks such as clean tracks, clear sensors and a charged battery are reasonable owner tasks. Opener troubleshooting and photo eyes are useful background. Do not bypass sensors or disable safety reversing features to get a gate moving. Call a qualified technician for motor, wiring or control board problems.
When a repair is the wrong answer
If several parts are failing at once, if wood is decayed through the structure, or if posts keep moving, repair costs can add up. The article on replacement signs offers a clearer way to compare. Where a failing structure could injure someone or let a child or pet escape, address it promptly or restrict access until it is fixed.