Find a builder to make your building structurally sound

RSJs support your new extension or other construction to ensure that your property is structurally sound. They are crucial parts of your building work that mustn't be ignored, and must be installed by a professional.  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 NN1 extension builders

Compare quotes

Compare quotes

Available extension builders in NN1 reply

Save Money

Save Money

Select your affordable NN1 extension builder

Post your job

From £1,744

Last active Sep 26
Get quotes

A G Hicks Building Services

Alan Hicks

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

A G Hicks Building Services provides a local, trusted ex...

From £2,184

Last active Aug 26
Get quotes

Picking your Local Builder

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

Picking your Local Builder provides a local, trusted ext...

From £2,160

Last active Aug 26
Get quotes

Northants Garage Doors

Trusted and professional extension builder in NN1. Experienced in all extension buildering work and keeping within budget and on quote. Northants G...

From £1,800

Last active Aug 26
Get quotes

M Home Renovations

M Home Renovations is an established extension buildering business in NN1. We come highly recommended and provide competitive quotes for your work....

From £2,064

Last active Aug 26
Get quotes

Walsh Builders Ltd

Walsh Builders Ltd is an established and experienced local extension builder in NN1. Please contact us for a free, no obligation quote and competit...

From £1,912

Last active Aug 26
Get quotes

Twelftree Builders

Need an Extension Builder in NN1? Twelftree Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many ...

From £2,392

Last active Aug 26
Get quotes

Wright Building

Relax... you have found a reliable extension builder in NN1. Wright Building is a friendly and reliable company based in NN1 who consider no job as...

From £2,072

Last active Aug 26
Get quotes

DAB & K&G Building Services

Need an Extension Builder in NN1? DAB & K&G Building Services has been helping local clients (20 mile radius) with their extension buildering jobs ...

From £2,448

Last active Aug 26
Get quotes

Samrai Associates Limited

Samrai Associates was founded by Hars Samrai in Northampton in order to provide clients with a prompt and robust Architectural Service. Over time m...

From £2,392

Last active Aug 26
Get quotes

Catling Building Services Ltd

Need an Extension Builder in NN1? Catling Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering job...

RSJ cost in NN1

Estimates for install an rsj near NN1

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in NN1 it ranges from £1,744 (A G Hicks Building Services based in NN3) to £2,448 (Samrai Associates Limited based in NN3).

Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.

Get rates and quotes to install an RSJ in NN1 by posting a job with HaMuch and we will send it to extension builders in NN1.


Get extension builder rates instantly

Estimates for common extension builder jobs in NN1;

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...