Build additional living space on your property in Lewes

A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in Lewes? To see prices and availability for your job click Get quotes.

HaMuch is Excellent

Granny annexe cost in Lewes - Sort by rates or availability

From £87,016

(last active 05/09/26)
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Good Construction (Sussex) Limited

Trusted and professional extension builder in Lewes. Experienced in all extension buildering work and keeping within budget and on quote. Good Cons...

From £86,992

(last active 05/09/26)
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Brighton Marina Hand Car Wash

Experienced extension builder ready to quote for your work. Brighton Marina Hand Car Wash is the best extension builder in Lewes. No obligation fre...

From £87,072

(last active 30/07/26)
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R & G Construction Brighton Ltd

Relax... you have found a reliable extension builder in Lewes. R & G Construction Brighton Ltd is a friendly and reliable company based in Lewes wh...

From £86,768

(last active 17/07/26)
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Graeme Davies Plumbing and Heating

Graeme Davies

Experienced extension builder ready to quote for your work. Graeme Davies Plumbing and Heating is the best extension builder in Lewes. No obligatio...

From £88,120

(last active 06/06/26)
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CITY BUILDING SERVICES LIMITED

Experienced extension builder ready to quote for your work. CITY BUILDING SERVICES LIMITED is the best extension builder in Lewes. No obligation fr...

From £86,856

(last active 20/04/26)
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Citadel Construction

Citadel Construction is an established extension buildering business in Lewes. We come highly recommended and provide competitive quotes for your w...

From £86,768

(last active 03/04/26)
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Ultimate Building Services

Tony Paice

Master builder since 1960 new build and refurb all trades many photo albums to show

From £87,144

(last active 03/04/26)
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RA Construction

Trusted and professional extension builder in Lewes. Experienced in all extension buildering work and keeping within budget and on quote. RA Constr...

From £87,248

(last active 30/03/26)
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Network Management Group

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

From £87,224

(last active 30/03/26)
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Hewison Jones Renovations LTD

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

Granny Annexe Cost in Lewes

Estimates for granny annexe near Lewes

Building a granny annexe ranges from £86,768 (Graeme Davies Plumbing and Heating based in BN3) to £88,120 (CITY BUILDING SERVICES LIMITED based in BN2), but these are just estimates that can help give you an idea of who will be better value in your area.

The best thing to do is to get quotes to build a granny annexe in Lewes by posting a job with HaMuch. We will send it to extension builders in Lewes who will be happy to help you.


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Estimates for common extension builder jobs in Lewes;

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...