From £52,320
London, E1
Need to find an Extension Builder near you for all your extension buildering work?
Renobuild Group provides a local, trusted extension buil...
From £52,168
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £52,280
Greater London, E1
Need to find an Extension Builder near you for all your extension buildering work?
Jamie Brown Construction provides a local, trusted exten...
From £52,392
Our company is based in the South East of England, covering Kent, Essex, London and the surrounding areas. We have over 25 years of experience deal...
From £52,504
Greater London, E1
PMG Design & Build Ltd is an established and experienced local extension builder in E1. Please contact us for a free, no obligation quote and compe...
From £52,336
Pencil and Brick is the collective name for our architect practice and our construction company. We're based in East London.We work on a wide range...
From £51,928
Shoreditch, E1
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 E1. Experienced in all extension buildering work and keeping within budget and on quote. AB Building ...
From £52,080
Checa Romero is an established and experienced local extension builder in E1. Please contact us for a free, no obligation quote and competitive rat...
From £52,528
Gabriel Shin is an established and experienced local extension builder in E1. Please contact us for a free, no obligation quote and competitive rat...

Mansard loft conversions range from the cheapest installation of £51,928 (Builders based in E1) to the dearest of around £52,528 (Gabriel Shin based in E1).
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 E1 by posting a job with HaMuch and we'll send it to extension builders in E1.
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 - £17,775

Two storey extension - £88,413

Build a timber frame extension - £26,275

Build a swimming pool - £81,275

Single storey extension - £60,504

Side return extension - £44,596

Install an RSJ - £2,475

Outbuilding - £10,275

Build a Mansard loft conversion - £52,275

Loft conversion - £36,330

Build a kitchen extension - £42,275

Hip to gable loft conversion - £42,275

Granny annexe - £87,275

Garden office - £10,275

Convert a Garage - £16,275

Garage - £18,775

Build a flat roof extension - £22,275

Build a dormer loft conversion - £42,275

Concrete foundations - £6,525

Convert a bungalow loft - £29,275

Convert a basement - £40,596