Extend your Lisburn 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 Lisburn? To see prices and availability for your job click green button.

HaMuch is Excellent

Build a flat roof extension cost in Lisburn - Sort by rates or availability

From £21,400

Last active Oct 26
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T.I Building

T.I Building is a trusted extension builder serving customers in Lisburn and the surrounding area. Contact us to today to get a competitive quote f...

From £21,136

Last active Jun 26
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Mount Oriel Conversions & Extensions

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

Mount Oriel Conversions & Extensions provides a local, t...

From £21,368

Last active May 26
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SM Plumbing & Heating

Relax... you have found a reliable extension builder in Lisburn. SM Plumbing & Heating is a friendly and reliable company based in Lisburn who cons...

From £21,336

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Belfast Loft Company

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

From £21,488

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AK Building Services

Adam King

Ak building 

From £21,384

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Finch Construction NI

Relax... you have found a reliable extension builder in Lisburn. Finch Construction NI is a friendly and reliable company based in Lisburn who cons...

From £21,176

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Extended living by Gilbert-Ash

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

Flat roof extension cost in Lisburn

Estimates for build a flat roof extension near Lisburn

A flat roof extension ranges from the cheapest of £21,136 (Mount Oriel Conversions & Extensions based in BT8) to the dearest of £21,488 (AK Building Services based in BT8), 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 Lisburn by posting a job with HaMuch. We'll send it to extension builders in Lisburn.


Estimates for common extension builder jobs in Lisburn;

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...