I have just come across your post, we are an architecture firm based in Wandsworth Town and we would be delighted to assist you with your project which sounds like something that we could certainly help you with.
We have completed many renovations, ground floor extensions, loft conversions in the area over the last few years and we can take you through your project from start to finish, we also have an in house party wall surveyor and structural engineer.
Please do give is a ring if you wish to discuss further,
Charlotte FraserO: 020 8874 6749 dRAW Architecture
340 Old York Road, Wandsworth, SW18 1SS www.draw-architecture.co.uk