Convert your basement in West Sussex from £34,620

Range from the cheapest Convert a basement £34,620 (ONE BUILD based in BN17) to the dearest Convert a basement £39,750 (Alan Pacy Builder based in BN12). To see prices and availability for your job click green button.

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From £38,850

Last active Nov 26
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C C OLEARY CONSTRUCTION

Experienced extension builder ready to quote for your work. C C OLEARY CONSTRUCTION is the best extension builder in West Sussex. No obligation fre...

From £39,750

Last active Nov 26
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Alan Pacy Builder

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

From £36,150

Last active Nov 26
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Stretch My Home Ltd

Trusted and professional extension builder in West Sussex. Experienced in all extension buildering work and keeping within budget and on quote. Str...

From £34,980

Last active Nov 26
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M Wesley General Builder & Property Maintenance

M Wesley General Builder & Property Maintenance is a trusted extension builder serving customers in West Sussex and the surrounding area. Contact u...

From £37,320

Last active Oct 26
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FIRST FORMAT BUILDING

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

FIRST FORMAT BUILDING provides a local, trusted extensio...

From £37,410

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H P Building Services Sussex

Member since August 2026

H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...

From £38,760

Last active Sep 26
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Haynes & Scott Developments

Relax... you have found a reliable extension builder in West Sussex. Haynes & Scott Developments is a friendly and reliable company based in West S...

From £34,980

Last active Jun 26
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S J Peace Building Contractor

Trusted and professional extension builder in West Sussex. Experienced in all extension buildering work and keeping within budget and on quote. S J...

From £34,620

Last active Jun 26
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ONE BUILD

Relax... you have found a reliable extension builder in West Sussex. ONE BUILD is a friendly and reliable company based in West Sussex who consider...

From £36,780

Last active May 26
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ACF Carpentry Ltd

ACF Carpentry Ltd is an established and experienced local extension builder in West Sussex. Please contact us for a free, no obligation quote and c...

Cheapest builders to convert your basement in West Sussex

Estimates for convert a basement near West Sussex

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.

What to do - Get rates and quotes for the cost to convert a basement in West Sussex by posting a job with HaMuch and we will send it to  extension builders in West Sussex.


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Estimates for common extension builder jobs in West Sussex;

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...