Before the First Slab: Making a Driveway Entrance That Swings True for Years

A driveway entrance has a habit of revealing itself slowly. For the first few months, everything looks smart: fresh paving, posts standing to attention, gates closing with a satisfying clunk. Then the wet weather arrives, the ground does what British ground tends to do, and the little faults start showing. A gate that catches on the paving. A post with a damp shadow at its base. A hinge that has dropped by a few millimetres but feels like a mile. Most of these problems were decided long before the first slab was laid.

That is why gate posts should be treated as part of the entrance system, not as a separate job bolted on at the end. Post, hinge, paving, drainage and power all have to agree with one another. If they do not, the driveway may still look fine from the road while quietly making life difficult behind the gate.

A gate post is not a fence post in a bigger hole

The most common mistake is treating driveway gate posts like garden fence posts. They are not. A fence post holds a panel; a gate post holds a moving load. Every time the gate swings, the post takes the strain. Add wind, a heavy timber leaf, a child hanging off it, or an automated operator doing the pushing, and the foundation needs to be much more serious than many people expect.

For a domestic driveway gate, the foundation depth and footprint should be set by the gate manufacturer, the post size, the ground conditions and the way the gate is hung. As a broad contractor rule, a driveway gate post foundation is often deeper and wider than a homeowner would guess from looking at the finished job. A lightweight pedestrian gate is one thing; a pair of timber driveway gates is another. The manufacturer's figures always win, but the contractor should be asking the question before the hole is dug.

The concrete matters too. A structural mix such as C20/25 or C25/30 is a more sensible starting point for driveway gate posts than a bag of fast-set mix intended for a wobbly fence post. For heavy gates, automation and exposed sites, the specification should be confirmed properly. It is also worth remembering that concrete does not like being asked to cure in a puddle. If the hole fills with water, the mix is weakened before it has even begun to do its job.

Alignment when the drive falls away

Sloped entrances are where good intentions often go wrong. A gate post can be perfectly vertical and still be in the wrong place if the driveway falls across the entrance. The gates may look level in the workshop and hopeless on the drive.

On a sloping entrance, the posts need to be set out together with the finished paving levels, not before them. The hinge positions, the clearance under the gate and the fall of the drive all need to be considered as one picture. If the drive falls towards the house, the gate may need to sit higher than instinct suggests. If it falls towards the road, the posts still need to stay true while the paving drops away.

This is also why it is worth setting a string line or laser across the entrance before any concrete is poured. A post that is 10mm out at the base can become a gate that binds at the latch. A post that is out of line with its partner can make an automated gate work harder than it should. These are small errors at the time and expensive ones later.

Water has to have somewhere to go

A gate post creates an obstacle, and water will find it. If the paving falls towards the post, or the ground around it is allowed to sit lower than the surrounding surface, you get a damp patch at the base. Over time, that can soften the ground, stain the post and make the whole entrance feel tired.

The entrance should have a clear drainage path that does not depend on water soaking away beside the post. Sometimes that means a slight fall across the driveway. Sometimes it means a channel drain at the threshold. Sometimes it means reshaping the verge or the apron so water does not run back towards the gates. The exact answer depends on the site, but the principle is simple: do not trap water against the post and hope for the best.

It is also worth checking where the water goes in a downpour, not just on a dry day. A driveway that drains beautifully in July can send a sheet of water across the entrance in November. If the gate posts are sitting in the path of that flow, the base will tell you about it soon enough.

Power, conduits and the things you cannot add later

If there is any chance the gates will be automated, put the ducting in now. Even if the gates are manual for the moment, a driveway entrance is the one place where digging up new paving to add a cable feels particularly silly.

A sensible approach is to install a duct with a draw cord from the gate post area back to a suitable power point, and to think about the other cables an automated system may need: safety edges, intercom, keypad, photocells or loop detectors. The exact requirements depend on the gate and the operator, but the ducting should be generous rather than mean. A 50mm duct is a common starting point, with separate routes for mains and low-voltage control where needed.

This is also the moment to decide where the control box will live. It should be accessible, protected from the worst of the weather and not parked in the one spot where the car door always opens. These are the details that separate a neat entrance from a tangle of surface-mounted cable and a control box screwed to the nearest wall in a hurry.

Hinges, clearances and the paving edge

The paving should not be laid tight against a gate's swing without thinking about clearance. Gates move. Timber swells. Hinges settle. A few millimetres of clearance at installation can disappear by the following spring.

Good practice is to leave a sensible gap under the gate and to make sure the paving falls away from the posts rather than towards them. The edge of the paving at the entrance also needs proper support. If the gate post foundation is sound but the paving edge beside it is loose, the entrance will still feel unsettled. A restrained edging detail, a solid haunch and a clean transition from drive to gate area are all part of making the entrance feel finished.

What to check before the mixer arrives

Before any concrete goes in, the entrance should be set out as a whole: post positions, gate clearances, finished paving levels, drainage falls and duct routes. The gate manufacturer's foundation details should be on site, not in an email that nobody has opened. The holes should be clean, the base should be firm and the concrete should be specified for the job.

It sounds fussy. It is also the difference between an entrance that still swings true after several British winters and one that starts to sag, stick or seep. The paving is the part everyone notices, but the posts are the part that quietly decides whether the whole entrance works.