Flat Roof Planning Permission: Everything You Need to Know

Flat roofs are a common sight. They’re often on garages, sheds and extensions. If you want to create a new flat roof or alter an existing one, you need to be aware of any regulations that apply.

Some of the regulations that relate to flat roofs are enforced by local planning authorities. Read on to find out more about planning permission and if you need it before you start work on your flat roof.

What is Planning Permission?

Planning permission is something you might need to get before doing certain types of building work. To obtain planning permission, you need to apply to your local planning authority.

The first thing your local planning authority will do when they get your application is check if the work you want to do needs planning permission. If it does, they’ll refer to local and national planning guides to help them decide whether to give it to you. Whether you get planning permission or not may depend on the size, appearance, use and access of what you want to build. Your local planning authority may also consider what effect the work you want to do will have on local residents.

Do I need planning permission to alter or install a flat roof?

Whether you need planning permission or not depends on what you want to do with your flat roof. You don’t need permission to alter the flat roof of your house as long as:

  • Any alteration projects no further than 15cm from the existing roof
  • No alternation is higher than the highest part of the existing roof

If you don’t want to abide by these terms then you’ll need to apply for planning permission.

It’s worth noting that these rules only apply to houses. You don’t need planning permission to alter the roof of an outbuilding, as long as the flat roof ends up being no more than 3 metres above the ground. For further information, contact your local planning authority.

If any building is listed or is on designated land, you’ll need to check with your local authority before going ahead. Designated land includes:

  • National parks
  • The Broads
  • Areas of Outstanding Natural Beauty
  • Conservation Areas
  • World Heritage Sites

How do I apply for planning permission?

You can make a planning permission application or get advice through your local planning authority’s website.

So now you should know a bit more about planning permission and how it applies to your flat roof. The most important thing to remember is that you should be 100% sure that you don’t need planning permission before doing any work on your flat roof. If you’re at all unsure, it’s much safer to seek advice than start work regardless.

Evy Coe

Evy works for Quotatis as a Content Marketing Executive. She loves to write about interior design and help homeowners with their DIY projects.