Convert your basement in Crystal Palace from £37,320

Range from the cheapest Convert a basement £37,320 (RCB Group Design & Build based in SE21) to the dearest Convert a basement £51,000 (Banga Decoration based in CR7). To see prices and availability for your job click green button.

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From £38,040

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 Crystal Palace. No obligation f...

From £39,120

Last active Nov 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 £51,000

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Banga Decoration

Sebastian Banga

Member since August 2025

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 £49,020

Last active Oct 26
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Buci builders ltd

Robert Buci

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

From £37,320

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....

...

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

From £37,950

Last active Oct 26
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PW Construction & Renovation Ltd

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

From £38,130

Last active Oct 26
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The Perfectionist

Experienced extension builder ready to quote for your work. The Perfectionist is the best extension builder in Crystal Palace. No obligation free q...

From £41,370

Last active Oct 26
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Glenn Miller Builders Limited

Glenn Miller

Relax... you have found a reliable extension builder in Crystal Palace. Glenn Miller Builders Limited is a friendly and reliable company based in C...

From £41,280

Last active Sep 26
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PRM BUILDING

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

From £41,100

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 Crystal Palace. We offer a competitive rate to complete all your exten...

Cheapest builders to convert your basement in Crystal Palace

Estimates for convert a basement near Crystal Palace

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 Crystal Palace by posting a job with HaMuch and we will send it to  extension builders in Crystal Palace.


Estimates for common extension builder jobs in Crystal Palace;

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...