Which lock suits a garden gate or outbuilding door

How an outdoor lock differs from an indoor door lock

A front-door lock lives in a dry, heated hallway and is used a handful of times a day by someone standing close to it. An outbuilding lock lives outside the building envelope entirely — no heating, no shelter from wind-driven rain, and often no light in winter. Moisture that gets into the mechanism has nowhere to evaporate to, so it sits there and starts to corrode.

Temperature swings matter more than most people expect. Water that has worked its way into a keyway during a thaw can freeze solid overnight, and a lock that froze once with moisture inside rarely turns as smoothly again. This is why an ordinary household padlock, even a solid-looking one, tends to seize or rust through within a season or two outdoors.

The other difference is exposure to force. A gate padlock is a visible target, and a shed hasp is often the weakest point in an otherwise reasonably solid structure. An outdoor lock needs to resist being levered, cut, or simply yanked off a badly fitted hasp — problems an indoor lock was never designed to solve.

Weatherproof padlocks — what the marking on the body actually means

Padlocks sold for outdoor use usually carry a marking on the body, often an IP rating such as IP65 or IP66. The number after IP tells you how well the keyway and body are sealed against dust and water jets — the higher the second digit, the better it copes with driving rain, not the higher the security. A weatherproof rating says nothing about how easily the shackle can be cut or the body pried open.

Look separately at the shackle material and thickness, and at the body construction. A hardened steel shackle, ideally with a boron or similar hardened coating, resists bolt cutters far better than plain steel. Brass and stainless steel bodies resist corrosion better than painted mild steel, which is worth the extra cost on anything mounted where it will be rained on directly for years.

A closed shackle — one where the padlock body covers most of the shackle when locked — leaves less metal exposed to a hacksaw or cutter than a standard long-shackle design. For a garden gate this is usually the better shape, since the hasp geometry rarely needs the extra shackle length anyway.

• IP65 or higher for genuine weather resistance
• Hardened steel, closed shackle rather than long open shackle
• Brass or stainless steel body over painted mild steel
• A keyway cover or shroud if the padlock faces prevailing wind and rain directly

Surface-mounted locks on a shed door — when they beat a padlock

A padlock and hasp only ever protects a door as well as the hasp is fixed and the timber it is screwed into. On many sheds the door itself is thin and the frame softwood, so a determined attempt to force the hasp or the screws can succeed regardless of how good the padlock is. In that situation a surface-mounted lock — a rim lock or a five-lever mortice-style unit fitted to the face of the door — spreads the load over a larger area and is harder to lever off in one movement.

Surface-mounted locks also suit doors that get opened often, since there is no separate padlock to carry, drop, or leave hanging unlocked out of habit. For an outbuilding used regularly through the year — a workshop, a garage door on the side, a summer kitchen — this convenience matters as much as the security itself.

The trade-off is installation. A surface-mounted lock needs a keep plate fixed to the frame in exact alignment with the bolt, and on an old or slightly warped shed frame that alignment can take real trial and error to get right. A padlock and hasp, by comparison, tolerates a door that has moved a little over the years.

A wooden gate and a metal gate need different fixings

On a wooden gate the weak point is almost always the timber itself, not the lock. Screws driven into softwood loosen as the wood swells and dries through the seasons, and a hasp held by four short woodscrews can be pulled clean out with a firm tug. Use coach bolts through the gate rather than woodscrews wherever the frame is thick enough, backed with a washer and nut on the inside face, and choose a hasp long enough to spread the load over solid timber rather than close to an edge that can split.

On a metal gate the fixing problem is the opposite — you cannot simply screw into box section or angle iron. Fittings need to be welded on, or bolted through drilled holes with the correct grade of bolt, since self-tapping screws into thin steel back out under repeated use. A welded hasp is generally the more durable option if the gate is going to see years of outdoor use, though it does mean the fitting is permanent.

Either way, the gate's own condition affects the lock's usefulness more than people assume. A wooden gate with a rotten stile or a metal gate with a rusted-through hinge gives an intruder an easier route than the lock ever will, so it is worth checking the gate and hinges at the same time as choosing the lock.

When it is worth having the lock fitted rather than doing it yourself

Fitting a padlock hasp to a wooden gate with coach bolts is well within reach for most people with an ordinary drill and spanner, and there is no need to call anyone in for that. Where it gets harder is a metal gate that needs welding or careful through-bolting, or a surface-mounted lock on a shed door where the keep has to line up precisely with the bolt for the door to lock smoothly at all.

A poorly aligned surface lock is a common source of frustration — the bolt binds, the door has to be lifted or slammed to lock, and eventually people stop using the lock altogether because it is easier not to. Getting the alignment right the first time, especially on a door or gate that is not perfectly square, is where a bit of experience saves a lot of fiddling.

Lock replacement work for gates and outbuildings starts from 60 € per job, and if the gate or fence itself needs attention before the lock will sit properly, fence repair and installation is charged from 45 € per hour. Either way a fixed quote can be given once you describe the gate or send a couple of photos.