Convert your basement in SE1 from £37,230

Range from the cheapest Convert a basement £37,230 (A to Z Builders Ltd based in SW1P) to the dearest Convert a basement £42,630 (Ask Building based in SE1). 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 £37,230

Last active Sep 26
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A to Z Builders Ltd

A to Z Builders Ltd are here to help customers who need an Extension Builder in SE1. We offer a competitive rate to complete all your extension bui...

From £40,290

Last active Sep 26
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Cornerstones Construction

Experienced extension builder ready to quote for your work. Cornerstones Construction is the best extension builder in SE1. No obligation free quot...

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 SE1 and the surrounding area. Contact us to today to get a competitive quo...

From £40,380

Last active Sep 26
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DUWIX BUILDING MAINTENANCE

DUWIX BUILDING MAINTENANCE are here to help customers who need an Extension Builder in SE1. We offer a competitive rate to complete all your extens...

From £38,580

Last active Sep 26
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Building and Plastering Solution

Peter Cesma

Experienced builder in all aspects of building works. All work guaranteed. Quality finish, promt ,honest and reliable services.  Public liabil...

From £39,480

Last active Aug 26
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Home Tranformers Ltd

At Home Tranformers Ltd we have been fitting bespoke bathrooms for over 10 years. We pride ourselves on being the go-to bathroom fitters for discer...

From £40,380

Last active Aug 26
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F & F Building Services

F & F Building Services is an established extension buildering business in SE1. We come highly recommended and provide competitive quotes for your ...

From £42,630

Last active Jul 26
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Ask Building

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

Ask Building provides a local, trusted extension builder...

Cheapest builders to convert your basement in SE1

Estimates for convert a basement near SE1

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 SE1 by posting a job with HaMuch and we will send it to  extension builders in SE1.

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


Estimates for common extension builder jobs in SE1;

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...