Answer
Can I put gates and pillars across my driveway?
Up to 1 metre next to the road, 2 metres further in, without permission.
In short
Gates, walls and pillars across a driveway are permitted development up to 2 metres high, but only 1 metre where they are next to a highway used by vehicles, which most driveway entrances are. Above that you need planning permission.
A note
General guidance, not advice. Rules vary by site, and Article 4 directions or conditions can change what applies. Check with your local authority and the Planning Portal.
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