From £52,328
London, E3
Need to find an Extension Builder near you for all your extension buildering work?
Reconstruction provides a local, trusted extension build...
From £52,072
Experienced extension builder ready to quote for your work. Glenward Builders Ltd is the best extension builder in E3. No obligation free quotes an...
From £52,360
Bow, E3
Relax... you have found a reliable extension builder in E3. Darren & Valentin Construction & Maintenance is a friendly and reliable company based i...
From £52,264
F I X U P are here to help customers who need an Extension Builder in E3. We offer a competitive rate to complete all your extension buildering job...
From £51,952
Hudson Bespoke Buildings is a trusted extension builder serving customers in E3 and the surrounding area. Contact us to today to get a competitive ...
From £51,976
ISLE CONSTRUCTION LTD is a trusted extension builder serving customers in E3 and the surrounding area. Contact us to today to get a competitive quo...
From £52,368
We're a team of builders and tradespeople who aim to provide quality service to people looking to renovate and build their dream home. We are sick ...
From £52,264
Andy Tunmer Building Services is an established and experienced local extension builder in E3. Please contact us for a free, no obligation quote an...
From £52,352
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £52,216
Trusted and professional extension builder in E3. Experienced in all extension buildering work and keeping within budget and on quote. AB Building ...

Mansard loft conversions range from the cheapest installation of £51,952 (Hudson Bespoke Buildings based in E15) to the dearest of around £52,368 (Team Constructions based in E14).
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 E3 by posting a job with HaMuch and we'll send it to extension builders in E3.
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 - £17,715

Two storey extension - £88,323

Build a timber frame extension - £26,215

Build a swimming pool - £81,215

Single storey extension - £59,304

Side return extension - £43,921

Install an RSJ - £2,415

Outbuilding - £10,215

Build a Mansard loft conversion - £52,215

Loft conversion - £35,768

Build a kitchen extension - £42,215

Hip to gable loft conversion - £42,215

Granny annexe - £87,215

Garden office - £10,215

Convert a Garage - £16,215

Garage - £18,715

Build a flat roof extension - £22,215

Build a dormer loft conversion - £42,215

Concrete foundations - £6,465

Convert a bungalow loft - £29,215

Convert a basement - £39,921