Single, Double or Sliding: Choosing Your Gate Configuration

Before you think about style, measure the clear opening width, and then measure two spaces around it.

The first is the swing arc: how much clear space there is inside the opening for a leaf to open into. A single leaf needs an arc as deep as the gate is wide. A double gate needs half that on each side. If a car parks there, if there is a garden bed, or if the ground rises, that space is not usable.

The second is run-back: clear space beside the opening, along the fence line, roughly as wide as the opening. That is where a sliding gate goes when it opens. It has to be clear for the whole travel — no meter boxes, no downpipes, no garden beds, no parked cars.

Whichever of those two you actually have decides your configuration. Style comes afterwards.

Single gates suit pedestrian openings and narrow vehicle entries. One leaf, one set of hinges, the simplest hardware and the lowest cost.

The limit is width. As a single leaf gets wider it gets heavier, the leverage on the top hinge increases, and the arc it needs to swing through gets deeper. Past a certain point you are asking a lot of two hinges and one post, and the gate will eventually show it by dropping at the latch side.

There is no universal maximum width, because it depends on the height, the infill and what the gate hangs off. A tightly spaced louvre leaf is far heavier than an open picket one of the same size. This is exactly the kind of thing that gets sized against your actual dimensions at quoting.

Doubles are the standard answer for a driveway. Splitting the opening halves the width of each leaf, which halves the swing arc needed on each side and dramatically reduces the load on each hinge set.

They also work where a single leaf simply has nowhere to go — a narrow side passage where a full-width leaf could not open, for instance.

Two things to plan. First, ground fall: both leaves have to clear the highest point they swing over, so a driveway that rises towards the house forces a bigger gap under the gate at the low end. Second, which leaf is the everyday one — normally one is held by a drop bolt into the ground and the other latches to it, so nominate the working side.

Leaves do not have to be equal. An uneven split often works better where the driveway sits off-centre or a pier is in the way.

Sliding gates solve the no-swing-room problem outright. Driveway starts at the property line, cars park immediately behind the gate, the entry rises steeply — all cases where a swing gate is either impossible or annoying every single day.

They are also the natural choice where automation is a priority, and where the ground makes swing clearance impossible to get right.

The cost is space and complexity. You need the run-back, and the gate has more moving parts and needs a more accurate set-out than a swing gate. If you have the room for a double gate and no particular reason to slide, a double is usually simpler and less expensive.