Extend your IG11 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 IG11? To see prices and availability for your job click green button.

HaMuch is Excellent

Build a flat roof extension cost in IG11 - Sort by rates or availability

From £22,712

Last active Nov 26
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Render

Experienced extension builder ready to quote for your work. Render is the best extension builder in IG11. No obligation free quotes and many happy ...

From £22,272

Last active Nov 26
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Kunshi Services UK Ltd

Kunshi Services UK Ltd is a trusted extension builder serving customers in IG11 and the surrounding area. Contact us to today to get a competitive ...

From £21,880

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Can design and Construction

Erald Kanani

Member since August 2025

Location

Barking, IG11

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

From £22,200

Last active Sep 26
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Derryard Construction Ltd

Relax... you have found a reliable extension builder in IG11. Derryard Construction Ltd is a friendly and reliable company based in IG11 who consid...

From £21,968

Last active Sep 26
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B J CULLEN BUILDERS

B J CULLEN BUILDERS are here to help customers who need an Extension Builder in IG11. We offer a competitive rate to complete all your extension bu...

From £22,032

Last active Sep 26
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Major Building Contractors Ltd

Relax... you have found a reliable extension builder in IG11. Major Building Contractors Ltd is a friendly and reliable company based in IG11 who c...

From £22,184

Last active Sep 26
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Sz Builders

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

Sz Builders provides a local, trusted extension builderi...

From £21,960

Last active Aug 26
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KLR Shopfitters

KLR Shopfitters

Location

RM82R

KLR Shopfitters supplies and fits modern aluminium shopfronts designed for strength, clarity, and long-lasting performance. Our service covers the ...

From £22,240

Last active Jul 26
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Albion Ra Ltd

Location

London, IG11

Albion RA offers complete construction solutions for residential clients across Kent\nand the surrounding areas.\n\nOur specialist team has many ye...

From £22,184

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A TEAM CONSTRUCTION LTD

Trusted and professional extension builder in IG11. Experienced in all extension buildering work and keeping within budget and on quote. A TEAM CON...

Flat roof extension cost in IG11

Estimates for build a flat roof extension near IG11

A flat roof extension ranges from the cheapest of £21,880 (Can design and Construction based in Ig11) to the dearest of £22,712 (Render based in IG1), 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 IG11 by posting a job with HaMuch. We'll send it to extension builders in IG11.


Estimates for common extension builder jobs in IG11;

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...