Extend your SO40 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 SO40? To see prices and availability for your job click green button.

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From £21,856

Last active Jun 26
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Trowel On

Trowel On is an established extension buildering business in SO40. We come highly recommended and provide competitive quotes for your work.

From £21,928

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GDS Building & Maintenance Ltd

GDS Building & Maintenance Ltd is an established and experienced local extension builder in SO40. Please contact us for a free, no obligation quote...

From £21,928

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1st Oak Building Preservation & Maintenance

Relax... you have found a reliable extension builder in SO40. 1st Oak Building Preservation & Maintenance is a friendly and reliable company based ...

From £22,112

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Safespec Building Services Limited

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

From £21,904

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KT Carpentry & Building Services

Our building services company KT Carpentry & Building Services has been helping customers in Southampton, Winchester, Brockenhurst and Portsmouth b...

Flat roof extension cost in SO40

Estimates for build a flat roof extension near SO40

A flat roof extension ranges from the cheapest of £21,856 (Trowel On based in SO40) to the dearest of £22,112 (Safespec Building Services Limited based in SO40), 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 SO40 by posting a job with HaMuch. We'll send it to extension builders in SO40.


Estimates for common extension builder jobs in SO40;

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.

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