DIY Doctor UK DIY Forums

HI,

My first post here.

Does anyone know if there are general rules for the maximum size of extension which can be made to a house with planning permission.

I seem to remember that up to 40 or 50% of the original volume of the house is allowed? Can't find anything in my local authority website & they want to charge for pre-planning advice!

Anyone, please?

ojb,
Depends where you live and whether for example you are in a green belt, aonb, conservation area etc.
You will have to look at your local councils policy documents which should answer the question

Hello

It's not based on volume as from October 2008 - it's based on circumstances as Stoneyboy points out and where the extension is to be located on the original building for instance distances from common boundaries and/or highways. A highway is not just a road but anything that you can get from a to b for example a bridleway.

The legislation is under the general permitted development order as amended 2008 - class A -

But beware Council's take different interpretations as the legislation is so new that there is no case law to rely on.

You need to submit a certificate of lawfulness to make sure the building is permitted development not requiring planning permission.