How to Prepare Pillars for Heavy Driveway Gates

By Understanding Building Regulations for Gate Posts
Comments 35
21 Jul 2026

How to Prepare Pillars for Heavy Driveway Gates

Why heavy driveway gates demand more from their pillars

A timber or steel driveway gate is not simply a garden gate scaled up. A single leaf of 1.8 metres can weigh well over 100kg, and once it is hung, every gust of wind and every hard shove adds a twisting load to the pillars either side. Those pillars have to resist compression from the weight above, bending when the gate pulls sideways, and uplift when wind gets underneath the leaf.

Pillars that look perfectly sound behind a lightweight garden gate will crack, lean and eventually fail under a heavy driveway gate. Getting them right at the outset is far cheaper than rebuilding later, and there is nothing more dispiriting than a handsome pair of gates on pillars that have started to drift apart.

Choosing the right pillar material

For a heavy gate, aim for a pillar at least 440mm square — a four-brick pillar, two bricks each way. Anything narrower will struggle with the leverage of a wide leaf. A three-brick pillar (roughly 330mm square) is acceptable only for lighter gates or pedestrian access.

Engineering bricks (Class B) are dense, strong and take up very little water — ideal for the load-bearing courses.
Dense concrete blocks work well and are quicker to lay, but avoid lightweight aerated blocks anywhere near the top of the pillar, where they can crush under the hinge bolts.
Cast concrete or stone pillars are excellent for security gates and suit a rendered or cladded finish.

Use a mortar mix of around 1:4 or 1:5 cement to sand with a plasticiser. Stronger is not better here — overly rich mortar is brittle and cracks rather than flexing.

Footings: the part that actually holds the gate

This is where most heavy gate failures begin. As a rule of thumb, the footing should be at least 600mm deep and 600mm square for a 440mm pillar. On clay soils, or within the root zone of a mature tree, go deeper — 900mm to 1,000mm is sensible. Dig down to firm subsoil, removing all topsoil and any soft pockets.

Pour a concrete base of C20/25 strength — roughly a 1:2:4 mix, or order ready-mix if you can get a wagon close enough. Make the base 200mm to 300mm thick and cast a reinforcement cage or sheet of mesh into it, with starter bars left proud so they tie into the pillar above. That steel is what resists the gate trying to pull the pillar over.

Set the two footings accurately apart. Measure the gate leaf width plus hinge clearance and latch clearance — usually 10mm to 15mm each side — before you dig, not after.

Building the pillar: plumb, reinforced and protected

Build in lifts of no more than about a metre a day, checking plumb with a spirit level on every course rather than every few. A pillar that is 5mm out at the bottom will be 20mm out by the time you reach coping height, and the gate will never sit square.

Carry the vertical reinforcement up through the centre of the pillar and fill the cavity with mortar or concrete as you go.
Insert a damp proof course at ground level to stop rising moisture staining the brickwork.
Finish with a coping stone overhanging by 25mm to 40mm, with a drip groove underneath so rainwater runs off clear of the pillar face.

If the pillars form part of a boundary or security gate arrangement, check any planning or boundary requirements before you build.

Let the concrete cure properly

This is the step most often rushed. Footing concrete should be left for at least seven days before you lay masonry on top, and it will not reach full strength for 28 days. Mortar in the pillar needs a minimum of seven days before it takes any real load, and 14 to 28 days is better still.

In cold spells, cover fresh work with hessian or polythene to protect it from frost. In hot, dry weather, damp the brickwork down and cover it so the mortar cures rather than dries out. Hanging a gate on green mortar is asking for trouble: the pillar will twist slightly under the load and set in that position.

Hanging the gate and avoiding common mistakes

Only hang the gates once the pillars are genuinely cured and standing plumb and parallel. Use resin anchors or cast-in threaded sockets for hinges rather than ordinary wall plugs — the loads are far too high for plastic fixings. Adjustable hinges make it much easier to fine-tune the gate once it is up.

The mistakes that come back to haunt homeowners are almost always the same ones:

Pillars too narrow for the weight of the leaf.
Footings too shallow, or poured onto soft ground.
No reinforcement tying the base to the pillar.
Hanging the gate before the mortar has cured.
No coping or drip detail, letting water into the brickwork.

Take your time over the foundations and the curing, and the gates above will stay true for decades. Rush them, and no amount of adjustment at the hinges will compensate.

Installation

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5 Comments

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Reply
- John Abraham says Jul 21, 2024 at 10:00am
  
  I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
  Reply
  - Robert Sonnysays Jul 21, 2024 at 10:00am
    
    I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
    Reply
Robert Sonny says Jul 21, 2024 at 10:00am

I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system
Reply

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