Extend your S18 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 S18? To see prices and availability for your job click green button.

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From £22,344

Last active Nov 26
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AMB Joinery & Building Services

Trusted and professional extension builder in S18. Experienced in all extension buildering work and keeping within budget and on quote. AMB Joinery...

From £21,936

Last active Sep 26
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Dore Decor

Dore Decor are a family run business with over 30 years experience - we offer an extensive range of building services and are able to provide a ful...

From £21,288

Last active Sep 26
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JON WINDLE CONSTRUCTION

Jon Windle

46 years in the trade

From £22,368

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Compton Spares.com

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

From £21,968

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R S Heating & Building Co

Trusted and professional extension builder in S18. Experienced in all extension buildering work and keeping within budget and on quote. R S Heating...

From £22,392

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Peak Roof Clean

Peak Roofclean offer an inexpensive way of permanently keeping your roof free of moss, lichens and algae. Not only is it 100% effective but...

From £22,072

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Cortworth Millhouse Design & Build

Need an Extension Builder in S18? Cortworth Millhouse Design & Build has been helping local clients (20 mile radius) with their extension builderin...

From £22,336

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Blenheim Park Developments

Blenheim Park Developments is an established and experienced local extension builder in S18. Please contact us for a free, no obligation quote and ...

Flat roof extension cost in S18

Estimates for build a flat roof extension near S18

A flat roof extension ranges from the cheapest of £21,288 (JON WINDLE CONSTRUCTION based in S17) to the dearest of £22,392 (Peak Roof Clean based in S42), 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 S18 by posting a job with HaMuch. We'll send it to extension builders in S18.


Estimates for common extension builder jobs in S18;

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...