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 Get quotes.

HaMuch is Excellent

Install an RSJ cost in AL1 - Sort by rates or availability

From £2,600

(rates updated 09/10/26)
Get quotes

Planson’s Building Services

James Planson

NO JOB TOO BIG OR SMALL.

From £2,432

(last active 09/10/26)
Get quotes

Buyerz Trading

Buyerz Trading is an established and experienced local extension builder in AL1. Please contact us for a free, no obligation quote and competitive ...

From £2,736

(last active 09/10/26)
Get quotes

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 £2,640

(last active 09/10/26)
Get quotes

IC Builders

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

From £2,272

(last active 09/10/26)
Get quotes

A1 Home Care Building Maintenance

A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in AL1. We offer a competitive rate to complete all your...

From £2,464

(last active 09/10/26)
Get quotes

A.MILLS BUILDING SOLUTIONS LTD

Need an Extension Builder in AL1? A.MILLS BUILDING SOLUTIONS LTD has been helping local clients (20 mile radius) with their extension buildering jo...

From £1,752

(last active 04/06/26)
Get quotes

Apollo Decor Ltd

Bradley Stevens

Experienced extension builder ready to quote for your work. Apollo Decor Ltd is the best extension builder in AL1. No obligation free quotes and ma...

From £2,344

Get quotes

DK Home Refurbishment Limited

Relax... you have found a reliable extension builder in AL1. DK Home Refurbishment Limited is a friendly and reliable company based in AL1 who cons...

From £2,184

Get quotes

Abalon Construction

Nicholas Bilyk

Abalon is Western Canada’s leading foundation repair and basement waterproofing company, operating in the Edmonton area for over 40 years (50 yea...

From £2,336

Get quotes

Property Interior Services

Relax... you have found a reliable extension builder in AL1. Property Interior Services is a friendly and reliable company based in AL1 who conside...

RSJ cost in AL1

Estimates for install an rsj near AL1

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in AL1 it ranges from £1,752 (Apollo Decor Ltd based in AL2) to £2,736 (R. Newman Construction based in AL4).

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 AL1 by posting a job with HaMuch and we will send it to extension builders in AL1.


Get extension builder rates instantly

Estimates for common extension builder jobs in AL1;

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...