Convert your basement in EC4N from £36,690

Range from the cheapest Convert a basement £36,690 (GS Fabric Ltd based in E2) to the dearest Convert a basement £42,270 (AAA Design Decorators based in SE17). To see prices and availability for your job click green button.

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From £37,770

Last active Nov 26
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SH Enterprise

Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...

From £39,660

Last active Oct 26

1 review

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Torrington

Torrington Design

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO

From £41,730

Last active Sep 26
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CK Constructions & Development Ltd

CK Constructions & Development Ltd is a trusted extension builder serving customers in EC4N and the surrounding area. Contact us to today to get a ...

From £36,690

Last active Sep 26
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GS Fabric Ltd

GS Fabric Ltd is an established and experienced local extension builder in EC4N. Please contact us for a free, no obligation quote and competitive ...

From £37,950

Last active Sep 26
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JM Building Services

JM Building Services is a trusted extension builder serving customers in EC4N and the surrounding area. Contact us to today to get a competitive qu...

From £39,930

Last active Aug 26
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Buildwiser

Buildwiser is a trusted extension builder serving customers in EC4N and the surrounding area. Contact us to today to get a competitive quote for ex...

From £41,100

Last active Jul 26
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Renobuild Group

Daniel Dixon

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

Renobuild Group provides a local, trusted extension buil...

From £42,270

Last active May 26
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AAA Design Decorators

AAA Design Decorators are here to help customers who need an Extension Builder in EC4N. We offer a competitive rate to complete all your extension ...

From £37,770

Last active Feb 26
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AGRI CONSTRUCTION

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

AGRI CONSTRUCTION provides a local, trusted extension bu...

From £39,930

Last active Jan 26
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AB Building Maintainance

Trusted and professional extension builder in EC4N. Experienced in all extension buildering work and keeping within budget and on quote. AB Buildin...

Cheapest builders to convert your basement in EC4N

Estimates for convert a basement near EC4N

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 EC4N by posting a job with HaMuch and we will send it to  extension builders in EC4N.

"Basement conversion" - LAMBETH, job posted 05/02/25


Estimates for common extension builder jobs in EC4N;

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...