Extend your B21 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 B21? To see prices and availability for your job click green button.

HaMuch is Excellent

How HaMuch saves you money

Post your job for free

Post your job for free

We send your job to ALL B21 extension builders

Compare quotes

Compare quotes

Available extension builders in B21 reply

Save Money

Save Money

Select your affordable B21 extension builder

Post your job

From £21,840

Last active Nov 26
Get quotes

MD Services

Relax... you have found a reliable extension builder in B21. MD Services is a friendly and reliable company based in B21 who consider no job as too...

From £21,984

Last active Nov 26
Get quotes

Atwal Building Services Ltd

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

Atwal Building Services Ltd provides a local, trusted ex...

From £21,984

Last active Nov 26
Get quotes

Brickfast Builders

Brickfast Builders is an established extension buildering business in B21. We come highly recommended and provide competitive quotes for your work....

From £21,944

Last active Nov 26
Get quotes

D&J Advanced Builders

Need an Extension Builder in B21? D&J Advanced Builders has been helping local clients (20 mile radius) with their extension buildering jobs for ma...

From £21,568

Last active Oct 26
Get quotes

Dave Mattock

Dave Mattock is an established and experienced local extension builder in B21. Please contact us for a free, no obligation quote and competitive ra...

From £21,936

Last active Aug 26
Get quotes

DLB Property Improvements & Maintenance

Need an Extension Builder in B21? DLB Property Improvements & Maintenance has been helping local clients (20 mile radius) with their extension buil...

From £21,984

Last active Aug 26
Get quotes

B S Builders

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

B S Builders provides a local, trusted extension builder...

From £21,776

Last active Jun 26
Get quotes

Bestway Building Services Ltd

Our building services company Bestway Building Services Ltd have eight years experience and have been helping customers in the West Midlands provid...

From £21,920

Last active Nov 25
Get quotes

x10hosts

Experienced extension builder ready to quote for your work. x10hosts is the best extension builder in B21. No obligation free quotes and many happy...

From £21,856

Get quotes

HSS CONSTRUCTION LTD

HSS CONSTRUCTION LTD are here to help customers who need an Extension Builder in B21. We offer a competitive rate to complete all your extension bu...

Flat roof extension cost in B21

Estimates for build a flat roof extension near B21

A flat roof extension ranges from the cheapest of £21,568 (Dave Mattock based in B44) to the dearest of £21,984 (Atwal Building Services Ltd based in B20), 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 B21 by posting a job with HaMuch. We'll send it to extension builders in B21.


Estimates for common extension builder jobs in B21;

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...