How big can a conservatory be without planning permission?

If you want to build a conservatory without planning permission, you’ll need to keep it below a certain size. First things first, your conservatory will need to take up less than 50% of your garden. If you’re building your conservatory to the rear of your property, your conservatory can’t come out

If you want to build a conservatory without planning permission, you’ll need to keep it below a certain size.

First things first, your conservatory will need to take up less than 50% of your garden.

If you’re building your conservatory to the rear of your property, your conservatory can’t come out further than 4m for a detached house or 3m for a semi-detached or terraced house. Having said that, if you get something called prior approval, that can go up to 8m and 6m respectively. A rear conservatory also can’t be higher than 4m – although if you’re building it within 2m of your property boundary, it has to be no higher than 3m.

Building your conservatory to the side of your property? In that case, it can’t be any wider than 50% of the size of the original house.