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Lee Townsend
Need to find an Extension Builder near you for all your extension buildering work?
Lp Townsend Brickwork provides a local, trusted extensio...
Relax... you have found a reliable extension builder in London. GDW Construction is a friendly and reliable company based in London who consider no...
Need to find an Extension Builder near you for all your extension buildering work?
OAK HOUSE BESPOKE BUILDERS provides a local, trusted ext...
Sean Smithers
Our building services company SDS Constructions has been established for many years and have been providing customers in Dagenham and the surroundi...
Vasile Boghean
Optimus Build Solutions delivers exceptional construction services in London and surronding areas. Specializing in bathroom and kitchen refurbishme...
SC General Builders Ltd are here to help customers who need an Extension Builder in London. We offer a competitive rate to complete all your extens...
Mandala Building Services is a family-owned design and build maintenance company, encompassing everything from residential refurbishment to large-s...
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in London. No obligation free quot...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in London. We offer a competitive rate to complete all your extension bui...

Mansard loft conversions range from the cheapest installation of £51,920 (Lp Townsend Brickwork based in SL2) to the dearest of around £53,232 (Optimus Build Solutions based in Rm1).
While these estimates give you a good idea how much you'll pay for a mansard loft conversion, the only way to get an accurate price is to get real quotes from real builders.
Get quotes to install a mansard loft conversion in London by posting a job with HaMuch and we'll send it to extension builders in London.
Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,920

Two storey extension - £88,630

Build a timber frame extension - £26,420

Build a swimming pool - £81,420

Single storey extension - £63,400

Side return extension - £46,225

Install an RSJ - £2,620

Outbuilding - £10,420

Build a Mansard loft conversion - £52,420

Loft conversion - £37,688

Build a kitchen extension - £42,420

Hip to gable loft conversion - £42,420

Granny annexe - £87,420

Garden office - £10,420

Convert a Garage - £16,420

Garage - £18,920

Build a flat roof extension - £22,420

Build a dormer loft conversion - £42,420

Concrete foundations - £6,670

Convert a bungalow loft - £29,420

Convert a basement - £42,225