A Gate Is a Moving Joint: Building a Side Gate That Still Latches in February

Most garden gates do not fail in a dramatic way. They droop. They catch on the path, the latch stops lining up, and by the time the wet weather settles in you are lifting the thing with one hand while trying to close it with the other. The mistake usually starts at the planning stage, when a gate gets treated like a fence panel that happens to open.

It is not. A fence panel is a static screen. A gate is a lever arm hanging off two hinges, catching wind, swelling in the wet and shrinking in the dry. It is a moving joint, and it needs to be built with that in mind.

The post does the real work

Before you think about the gate itself, sort the hanging post. A gate concentrates load in a way a fence run never does. If you bolt a gate to a standard fence post, or to a post that is only buried a spade's depth into soft ground, you are asking for movement. Movement at the post becomes sag at the latch.

For a typical side gate up to around a metre wide, a 100mm x 100mm post is the sensible minimum. Go bigger for a wide or solid gate, and consider a heavier post if the gate will catch a lot of wind. Set it deep enough to get below the loose top soil and into something firmer, and brace it while any concrete or post mix sets. The post should be checked for plumb in two directions, not just one. A post that looks upright from the path can still lean along the fence line.

Do not hang a gate from a post that is also carrying a long run of fence without thinking about the leverage. Sometimes a separate gate post, tied back to the fence structure, is the cleaner answer. The gate deserves its own foundation.

Build in room for the swell

British timber does not stay the same size through the year. A gate built tight in a dry August can bind badly by January. A gate built with generous gaps in winter can rattle in summer. You need tolerances that allow the timber to move without the gate feeling loose.

Aim for a clear gap of around 8mm to 10mm at each side, and a little more at the latch. Do not make the latch fit exact. The latch keep should have room for adjustment, because the gate will move after it is hung and again when the seasons change. If the gate has a top rail or a cap, leave a small gap where it meets the post rather than expecting a flush fit all year.

The same applies to the bottom of the gate. A gate that skims the path in summer will drag in winter. Allow a sensible gap, and check it after the first wet spell rather than assuming the first fit is final.

Hinges are a load path, not a decoration

Hinge placement matters more than hinge style. The top hinge should sit near the top rail and the bottom hinge near the bottom rail, spreading the load as widely as the gate design allows. Hinges clustered too close together give the gate more leverage to twist and drop.

For a ledged and braced gate, fix the hinges into the hanging stile, not into end grain. Use through bolts where the design allows, or heavy coach screws with pilot holes. Small screws into softwood will work loose as the gate swings. Galvanised or stainless fixings are worth the extra cost in a wet garden, and adjustable hinges are useful because they give you a way to correct minor droop without rebuilding the gate.

A third hinge can help on a heavy gate, but only if it is fitted properly. Adding a hinge in the middle of a stile that is not designed for it can create a hard spot and split the timber.

Brace from the bottom hinge upward

A diagonal brace is not there to look traditional. It helps carry the weight of the gate back to the hinges. On a typical ledged and braced side gate, the brace should run from the bottom of the hanging stile up towards the top of the latch stile. That puts the brace in compression and helps stop the gate dropping at the far edge.

Cut the brace to fit properly rather than screwing a rough diagonal to the face and hoping for the best. A housed or half-lapped joint is better than a butt joint, and glue plus fixings is better than fixings alone. If the gate is wide, think about two braces or a stronger frame. A single skinny brace on a wide, solid gate is not much of a promise.

Wind load changes everything

A solid timber gate is a sail. In an exposed garden, a wide close-boarded gate can take a serious battering. That load goes through the hinges into the post, and it will find any weak fixing. If your garden is windy, consider a more open design, a slatted gate or a lighter frame. It is not a retreat from good design; it is good design.

The latch is the other weak point. Fit it after the gate has been hung and has had a few days to settle. Use an adjustable keep rather than cutting a tight notch and calling it done. A latch that needs a shoulder to close is a latch that will fail.

Check it with the seasons

A gate is not a fit-and-forget job. Once a year, ideally in autumn, check the post for movement, tighten any bolts, oil the hinges and clear the edges where timber has swelled. In summer, if the gate rattles, adjust the latch rather than over-tightening everything. In winter, if it binds, plane a little from the edge rather than forcing it. Take off too much and you will be back in summer with a gap.

Build for adjustment from the start: decent posts, sensible gaps, adjustable hardware and a brace that does its job. Then the gate should still shut in February, which is a better test than any dry-day fitting.