Extend your Ewell with an extension

A flat roof extension is a great way to add extra space to your home without splashing out on the costs of a pitched roof extension. Often exempt from planning permission rules, you can build a flat roof extension up to 3 metres in height as long as it's not visible from a road. But how much do they cost in Ewell? To see prices and availability for your job click green button.

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From £22,800

Rates updated Oct 26
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GDW Construction

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...

From £22,800

Rates updated Oct 26
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OAK HOUSE BESPOKE BUILDERS

Need to find an Extension Builder near you for all your extension buildering work?

OAK HOUSE BESPOKE BUILDERS provides a local, trusted ext...

From £22,176

Rates verified Oct 26
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Self employed

Hamza Elezi

Hight quality of jobs

From £22,048

Rates verified Sep 26
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J&J Building Solutions

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

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Banga Decoration

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...

From £22,160

Last active Nov 26
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AVIB City Construction Ltd

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

From £22,144

Last active Nov 26
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Greens Gardening & Landscape Property Maintenance

John Mcdonagh

Watch our short video highlighting all our expertise and services here:

more than 10 y...

From £22,192

Last active Nov 26
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Gb construction

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...

From £22,408

Last active Nov 26
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Brick House Builders Ltd

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...

From £22,208

Last active Oct 26
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Building Vision London Ltd

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...

Flat roof extension cost in Ewell

Estimates for build a flat roof extension near Ewell

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.


Estimates for common extension builder jobs in Ewell;

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.

More extensions & conversions cost guides...