Build a mansard loft conversion in Barry from £51,200

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 £52,240

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L.Jones Building

Lewis Jones

Member since October 2026

Location

Barry, CF62

We are polite, punctual and respectful small construction business. We take pride in all our work.

From £51,728

Last active Oct 26
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The Philog Paving Services

The Philog Paving Services is an established extension buildering business in Barry. We come highly recommended and provide competitive quotes for ...

From £51,808

Last active Oct 26
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Chapman Builders

Experienced extension builder ready to quote for your work. Chapman Builders is the best extension builder in Barry. No obligation free quotes and ...

From £51,616

Last active Sep 26
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JA Building Maintenance

Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in Barry. No obligation free quot...

From £51,200

Last active Aug 26
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Penarth Loft Conversions Ltd

Bill Coslett

35 years in the trade and there is not much we haven't come across or done from pools to extensions and we specialise in loft conversions

From £51,600

Last active Jul 26
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MARWAY BUILDING LTD

MARWAY BUILDING LTD is a trusted extension builder serving customers in Barry and the surrounding area. Contact us to today to get a competitive qu...

From £51,560

Last active Jul 26
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Elite Building Contractors South Wales

Trusted and professional extension builder in Barry. Experienced in all extension buildering work and keeping within budget and on quote. Elite Bui...

From £51,760

Last active Jun 26
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RDL BUILDING SERVICES LTD

Robert Lewis

RDL BUILDING SERVICES LTD is a trusted extension builder serving customers in Barry and the surrounding area. Contact us to today to get a competit...

From £51,584

Last active Apr 26
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DPC BUILDERS

Location

Barry, CF62

Relax... you have found a reliable extension builder in Barry. DPC BUILDERS is a friendly and reliable company based in Barry who consider no job a...

From £52,600

Last active Mar 26
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Blueprint Construction & Development Ltd

Location

Barry, CF62

Blueprint Construction & Development Ltd is a trusted extension builder serving customers in Barry and the surrounding area. Contact us to today to...

Mansard loft conversion cost in Barry

Estimates for build a mansard loft conversion near Barry

Mansard loft conversions range from the cheapest installation of £51,200 (Penarth Loft Conversions Ltd based in CF64) to the dearest of around £52,600 (Blueprint Construction & Development Ltd based in CF62).

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 Barry by posting a job with HaMuch and we'll send it to extension builders in Barry. 


Estimates for common extension builder jobs in Barry;

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...