Extend your Harpenden with an extension

A flat roof extension is a great way to add extra space to your home without splashing out on the costs of a pitched roof extension. Often exempt from planning permission rules, you can build a flat roof extension up to 3 metres in height as long as it's not visible from a road. But how much do they cost in Harpenden? To see prices and availability for your job click green button.

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From £22,344

Last active Oct 26
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Peter's Gutters

Peter Rourke

Location

Harpenden, AL5

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

From £21,936

Last active Oct 26
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Bacan's cleaning painting and decorating

Elena nuta Radu

Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..

From £22,344

Last active Oct 26
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Greg-Bud

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

Greg-Bud provides a local, trusted extension buildering ...

From £22,272

Last active Oct 26
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Top Notch Tradesmen

Top Notch Tradesmen is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and c...

From £22,456

Last active Oct 26
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A.J Builders

A.J Builders is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and competit...

From £21,968

Last active Oct 26
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A S G Developments - Herts LTD

Amarjeet Gill

Architecture and Construction all in one place. 

FREE DRAWINGS for all projects we build. 

From £22,232

Last active Oct 26
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Buyerz Trading

Buyerz Trading is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and compet...

From £22,536

Last active Oct 26
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R. Newman Construction

Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...

From £22,440

Last active Oct 26
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IC Builders

IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...

From £22,072

Last active Oct 26
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A1 Home Care Building Maintenance

A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete al...

Flat roof extension cost in Harpenden

Estimates for build a flat roof extension near Harpenden

A flat roof extension ranges from the cheapest of £21,936 (Bacan's cleaning painting and decorating based in LU1) to the dearest of £22,536 (R. Newman Construction based in AL4), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes. 

Find out how much your flat roof extension will cost in Harpenden by posting a job with HaMuch. We'll send it to extension builders in Harpenden.


Estimates for common extension builder jobs in Harpenden;

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...