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Relax... you have found a reliable extension builder in Ewell. GDW Construction is a friendly and reliable company based in Ewell who consider no j...
Need to find an Extension Builder near you for all your extension buildering work?
OAK HOUSE BESPOKE BUILDERS provides a local, trusted ext...
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Ewell. No obligation free quote...
From £23,200
Sebastian Banga
Member since August 2025
Banga decoration. Is Base in south London for number of year Banga decoration is a small company. Wich provide an excellent job to the custom...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
John Mcdonagh
Watch our short video highlighting all our expertise and services here:
more than 10 y...
Gani Bush
Gb construction are here to help customers who need an Extension Builder in Ewell. We offer a competitive rate to complete all your extension buil...
Jatinder Kahlon
Hi, I’m Jatinder. I’m a qualified electrician and gas safe registered professional with 10 years of experience in the trade. We specialise in l...
Building Vision London Ltd is a trusted extension builder serving customers in Ewell and the surrounding area. Contact us to today to get a competi...

A flat roof extension ranges from the cheapest of £22,048 (J&J Building Solutions based in SW16) to the dearest of £23,200 (Banga Decoration based in CR7), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Ewell by posting a job with HaMuch. We'll send it to extension builders in Ewell.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Build A Flat Roof Extension near Ewell | £44 | £275 |
| Build A Flat Roof Extension near Epsom | £44 | £275 |
| Build A Flat Roof Extension near Sutton | £43 | £274 |
| Build A Flat Roof Extension near Kingston Upon Thames | £43 | £271 |
| Build A Flat Roof Extension near Esher | £43 | £274 |
| Build A Flat Roof Extension near Tadworth | £41 | £271 |
| Build A Flat Roof Extension near Reigate & Banstead | £41 | £271 |
| Build A Flat Roof Extension near Wimbledon | £43 | £273 |
| Build A Flat Roof Extension near Merton | £43 | £272 |
| Build A Flat Roof Extension near Richmond Upon Thames | £43 | £274 |
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 - £17,914

Two storey extension - £88,620

Build a timber frame extension - £26,414

Build a swimming pool - £81,414

Single storey extension - £63,272

Side return extension - £46,153

Install an RSJ - £2,614

Outbuilding - £10,414

Build a Mansard loft conversion - £52,414

Loft conversion - £37,628

Build a kitchen extension - £42,414

Hip to gable loft conversion - £42,414

Granny annexe - £87,414

Garden office - £10,414

Convert a Garage - £16,414

Garage - £18,914

Build a flat roof extension - £22,414

Build a dormer loft conversion - £42,414

Concrete foundations - £6,664

Convert a bungalow loft - £29,414

Convert a basement - £42,153