Harringay, Haringey - So Good they Spelt it Twice!

builder for basement

does anyone have a recommendation for a builder who can turn an existing basement into a usable room - ie create/ dig a window and make sure its damp proof?

Tags for Forum Posts: basement conversion builder, cellar conversion

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Permalink Reply by Anna on November 27, 2018 at 5:56

Hi Paul. I think every case is so different it’s not so meaningful giving a figure. We had an existing room with a concrete floor and enough head room we just wanted to put in a small light well and window and damp proofing that wouldn’t fail. In order to get planning permission it had to meet current building regs (450) so it had to have a new floor and cavity wall drainage and pump. That also mexnt I needed a structural engineer to design it (5000) It also meant I needed to issue party wall notices to neighbours (that ended up costing 3000) and because it’s a flat I needed a licence for alteration (750) So you can see that’s about 10k before I’ve done a thing. If you don’t have to do all that it’s much cheaper If anyone is wanting basement damp proofing I recommend trying AP Gooch first They seem good to deal with and reasonable price. If anyone wants more details PM me. Time frame- design a month. Planning 6 weeks legal paperwork 4-6 weeks. Work 4- 6 weeks I think give or take And in our case there were delays at everyone of those stages It’s not intrusive at all because everything is going in and out of the lightwell. Lovely considerate builders who hire their own loo They’ve taken care about protecting surfaces.

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Permalink Reply by Mavic Starfish on November 27, 2018 at 10:48

as per upthread we used AP Gooch to turn a damp coal cellar into storage. No party wall, but they dug down a foot or so, (skip to remove excess soil) new floor, including membrane, concrete, drain channels and boarding over. Cavity wall membrane for walls, and pump to remove water from walls to outside drain, including pipework + new cellar staircase and plastering to complete walls. Just hit the first year anniversary and no issues.