Extend your Surrey 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 Surrey? 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 Surrey. GDW Construction is a friendly and reliable company based in Surrey who consider no...

From £22,184

Last active Nov 26
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BENCHMARK BUILDING &

BENCHMARK BUILDING & is a trusted extension builder serving customers in Surrey and the surrounding area. Contact us to today to get a competitive ...

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 Surrey. We offer a competitive rate to complete all your extension bui...

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 £22,080

Last active Oct 26
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D & R Roofing & Loft Conversions, Building & Design

Relax... you have found a reliable extension builder in Surrey. D & R Roofing & Loft Conversions, Building & Design is a friendly and reliable comp...

From £22,288

Last active Oct 26
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Hilton building contractors ltd

Hilton building contractors ltd is a trusted extension builder serving customers in Surrey and the surrounding area. Contact us to today to get a c...

From £22,184

Last active Oct 26
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Amazing Space Design and Build Ltd.

Relax... you have found a reliable extension builder in Surrey. Amazing Space Design and Build Ltd. is a friendly and reliable company based in Sur...

From £21,936

Last active Oct 26
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Masters Property Services

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

From £22,328

Last active Sep 26
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J Stevens Roofing & Guttering

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

From £22,088

Last active Sep 26
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L M G Building Services (London) Ltd

Relax... you have found a reliable extension builder in Surrey. L M G Building Services (London) Ltd is a friendly and reliable company based in Su...

Flat roof extension cost in Surrey

Estimates for build a flat roof extension near Surrey

A flat roof extension ranges from the cheapest of £21,936 (Masters Property Services based in SM5) 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 Surrey by posting a job with HaMuch. We'll send it to extension builders in Surrey.


Estimates for common extension builder jobs in Surrey;

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...