Build additional living space on your property in Streatham

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 Streatham? To see prices and availability for your job click Get quotes.

HaMuch is Excellent

Granny annexe cost in Streatham - Sort by rates or availability

From £87,048

Rates verified Sep 26
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J&J Building Solutions

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Streatham. No obligation free q...

From £88,024

Last active Oct 26
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Buci builders ltd

Robert Buci

Buci builders ltd is a trusted extension builder serving customers in Streatham and the surrounding area. Contact us to today to get a competitive ...

From £88,200

Member since August 2025

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Banga Decoration

Sebastian Banga

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 £86,984

Last active Oct 26

2 reviews

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RCB Group Design & Build

Vasi J

No Call out charges! 

All Jobs Fully Insured and Guaranteed !!!

All aspects of Plumbing, Heating and Drains....

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"I am very pleased with the work carried out. All very clear and transparent." - ROMFORD,reviewed 10/01/18, KELLY

From £87,040

Last active Oct 26
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PW Construction & Renovation Ltd

PW Construction & Renovation Ltd is a trusted extension builder serving customers in Streatham and the surrounding area. Contact us to today to get...

From £87,144

Last active Oct 26
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Greens Gardening & Landscape Property Maintenance

John Mcdonagh

Watch our short video highlighting all our expertise and services here:

more than 10 y...

From £87,072

Last active Sep 26
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Sonik Building Services

Trusted and professional extension builder in Streatham. Experienced in all extension buildering work and keeping within budget and on quote. Sonik...

From £87,320

Last active Sep 26
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Renaissance Timothy Brewer Ltd

Renaissance Timothy Brewer Ltd is an established extension buildering business in Streatham. We come highly recommended and provide competitive quo...

From £87,336

Last active Sep 26
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PRM BUILDING

Relax... you have found a reliable extension builder in Streatham. PRM BUILDING is a friendly and reliable company based in Streatham who consider ...

From £87,320

Last active Sep 26
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QSA Builders Ltd

QSA Builders Ltd are here to help customers who need an Extension Builder in Streatham. We offer a competitive rate to complete all your extension ...

Granny Annexe Cost in Streatham

Estimates for granny annexe near Streatham

Building a granny annexe ranges from £86,984 (RCB Group Design & Build based in SE21) to £88,200 (Banga Decoration based in CR7), 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 Streatham by posting a job with HaMuch. We will send it to extension builders in Streatham who will be happy to help you.


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Estimates for common extension builder jobs in Streatham;

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...