Build a mansard loft conversion in Steyning from £51,880

Mansard loft conversions are ideal if you want to maximise the space in your home. Extending your roof out into a flat roof with an almost vertical wall, they almost always require planning permission but can add significant value to your home. To see prices and availability for your job click green button.

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From £52,024

Rates verified Oct 26
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Ferguson Building Services Limited

Ferguson Building Services Limited is an established and experienced local extension builder in Steyning. Please contact us for a free, no obligati...

From £52,200

Last active Nov 26
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Alan Pacy Builder

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

From £51,880

Last active Nov 26
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Stretch My Home Ltd

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

From £51,984

Last active Oct 26
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FIRST FORMAT BUILDING

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

FIRST FORMAT BUILDING provides a local, trusted extensio...

From £51,992

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H P Building Services Sussex

Member since August 2026

H P Building Services Sussex is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles arou...

From £52,296

Last active Oct 26
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Proper Copper Design

Proper Copper DesignWe are a design lead copper homeware company specializing in contemporary handles, taps, showers and accessories. Our products ...

From £52,016

Last active Sep 26
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Good Construction (Sussex) Limited

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

From £51,936

Last active May 26
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ACF Carpentry Ltd

ACF Carpentry Ltd is an established and experienced local extension builder in Steyning. Please contact us for a free, no obligation quote and comp...

From £52,224

Last active Mar 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...

From £51,960

Last active Mar 26
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BRICKTEC BUILDING SERVICES

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

Mansard loft conversion cost in Steyning

Estimates for build a mansard loft conversion near Steyning

Mansard loft conversions range from the cheapest installation of £51,880 (Stretch My Home Ltd based in BN12) to the dearest of around £52,296 (Proper Copper Design based in BN3).

While these estimates give you a good idea how much you'll pay for a mansard loft conversion, the only way to get an accurate price is to get real quotes from real builders.

Get quotes to install a mansard loft conversion in Steyning by posting a job with HaMuch and we'll send it to extension builders in Steyning. 


Estimates for common extension builder jobs in Steyning;

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...