DIY Doctor

Main navigation

What Permissions for Digging out Existing Basement?

Postby Ascoines » Sun Nov 19, 2017 5:01 pm


Our house was built in 1860 and we have an existing basement (with staircase) but it has been filled with soil.

We want to convert it into a bedroom.

What permissions do we need?

Where do we start in terms of surveys etc?

Any advice gratefully received!

Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Sun Nov 19, 2017 4:54 pm

Postby VinnyB » Sun Nov 19, 2017 9:50 pm

Hey Alex

For the purpose of this post I have assumed that your retaining the existing walls and slab. Planning permission will not be required but should the works be more extensive then you could need planning permission.

Building Control will need to be notified and the proposals of your works issued to them. I would recommend using an "Approved Inspector" over your local authority as in my experience they are quicker to respond and alot more pragmatic. Estimated cost - £800.

I assume that you will be installing a cavity membrane system on the walls and floor (most basements require this) to keep out the moisture. This action activates the Party Wall Act.

Fixing the cavity membrane system into the party walls will require you to serve a Party Wall notice on your neighbours on both sides. Should you neighbour "dissent" to the works then they can appoint their own surveyor or you share a surveyor - but your on the hook to pay the surveyors fees (estimated £1,500 per neighbour).

Hope this helps

Vinny (RICS Building Surveyor)
Rank: Apprentice
Progress to next rank:
Posts: 7
Joined: Sun Nov 19, 2017 9:34 pm

Postby michaelscad » Tue Jan 02, 2018 12:20 pm

defintely buiding regulations
you don't need planning permision
Rank: Tradesman
Progress to next rank:
Posts: 49
Joined: Sun Sep 17, 2017 12:58 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics