When Do You Need Planning Permission for a Conservatory?

A conservatory is the ideal way to link your indoor and outdoor living spaces, allowing ambient light into the rooms of your house, and creating extra space in which to relax with family and friends. But the rules about planning permission can be confusing, so here is a simple guide to some of the rules.

Standard Conservatories

For most conservatories, planning permission is not necessary, as they fall within the rule of permitted development. This is the same as the rule for a brick built extension: it cannot exceed half of the original house footprint. That is the house as it was built, not including any extensions added by you or any previous owners.


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The conservatory roof cannot be higher than the highest part of your roof, and it cannot extend more than three metres beyond the rear wall of your house if you are terraced or semi-detached, or four metres if your house is detached. These rules don’t apply if you live in a designated area such as a National Park, an Area of Outstanding Natural Beauty or a conservation area. You may still be able to have a conservatory to the rear, if certain conditions are met.

Larger Conservatories

If you have set your heart on a bigger conservatory than allowed within permitted development, it is still possible, but you need to notify your local planning authority. Under the Neighbour Consultation Scheme, your neighbours will be given the chance to object. If they are happy, you can go ahead without any further permissions.


conservatory tables chairs plants room in house next to garden

If you fall within the permitted development parameters, there are still a few rules you need to bear in mind. For example, a conservatory to the side of your house cannot exceed half the original width of the house and it can only extend to a height of four metres. This is reduced to three metres if your conservatory is within two metres of your boundary. Conservatories to the rear can extend to four metres in height as long as this doesn’t exceed the eaves of your house.

Once you have chosen your conservatory size, it’s important to think about the conservatory roofing and that depends on how you want to use your space. Tiled roofs are ideal for reducing glare and providing privacy. If you choose this roofing option, there are plenty of fashionable styles from which to choose. For clear, concise information and advice, you can’t do better than getting in touch with Sentinel Solid Roof – we will be very happy to explain your different options.