From £34,200
London, E17
Flow-Right Construction is an established extension buildering business in E17. We come highly recommended and provide competitive quotes for your ...
From £33,225
Italian Home Renovation are here to help customers who need an Extension Builder in E17. We offer a competitive rate to complete all your extension...
From £38,325
London, E17
Specialized in advising and implement the choices of the most demanding customers. From inerior design with also crafted tailored solutions and the...
From £34,200
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £35,025
London Airports Taxi are here to help customers who need an Extension Builder in E17. We offer a competitive rate to complete all your extension bu...
From £46,050
Walthamstow, E17
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £53,775
We are one of the leading specialists company in London and we believe in providing a wide range of services to many of our clients. We have extens...
From £34,350
Essex, E17
Gold & Berg are a London-based, international construction services company and are a leading builder in diverse market segments. The company has e...
From £35,775
Relax... you have found a reliable extension builder in E17. Amwell Construction Ltd is a friendly and reliable company based in E17 who consider n...

Comparing extension builders estimates for Loft conversion gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost of a loft conversion in E17 by posting your job to extension builders in E17.
"Loft conversion" - E17, job posted 01/01/70
"Loft conversion Double storey extension" - E18, job posted 08/09/25
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 - £17,938

Two storey extension - £88,658

Build a timber frame extension - £26,438

Build a swimming pool - £81,438

Single storey extension - £63,768

Side return extension - £46,432

Install an RSJ - £2,638

Outbuilding - £10,438

Build a Mansard loft conversion - £52,438

Loft conversion - £37,860

Build a kitchen extension - £42,438

Hip to gable loft conversion - £42,438

Granny annexe - £87,438

Garden office - £10,438

Convert a Garage - £16,438

Garage - £18,938

Build a flat roof extension - £22,438

Build a dormer loft conversion - £42,438

Concrete foundations - £6,688

Convert a bungalow loft - £29,438

Convert a basement - £42,432