From £2,360
Venta Construction is an established and experienced local extension builder in Liverpool Street. Please contact us for a free, no obligation quote...
From £2,328
Fornia Build Ltd is an established and experienced local extension builder in Liverpool Street. Please contact us for a free, no obligation quote a...
From £2,728
Bring your vision to life with Fornia build. Our main aim is to design and build exceptional residential properties in prime locations, to the high...
From £2,240
TOP CONSTRUCTION is an established extension buildering business in Liverpool Street. We come highly recommended and provide competitive quotes for...
From £2,472
Need an Extension Builder in Liverpool Street? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs ...
From £2,128
Shine Your Home is an established extension buildering business in Liverpool Street. We come highly recommended and provide competitive quotes for ...
From £2,456
Regalia Ltd are a company that regards itself on the excellent craftsmanship and attention to detail that occurs during every process in our projec...
From £2,392
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
From £2,616
Glass Spaces, Extensions and Rooms is an established and experienced local extension builder in Liverpool Street. Please contact us for a free, no ...
From £2,112
Kindred Elite is an established extension buildering business in Liverpool Street. We come highly recommended and provide competitive quotes for yo...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Liverpool Street it ranges from £2,112 (Kindred Elite based in EC2A) to £2,728 (Fornia Build Ltd based in EC1V).
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 Liverpool Street by posting a job with HaMuch and we will send it to extension builders in Liverpool Street.
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.

Underpin a building - £17,683

Two storey extension - £88,275

Build a timber frame extension - £26,183

Build a swimming pool - £81,183

Single storey extension - £58,664

Side return extension - £43,561

Install an RSJ - £2,383

Outbuilding - £10,183

Build a Mansard loft conversion - £52,183

Loft conversion - £35,468

Build a kitchen extension - £42,183

Hip to gable loft conversion - £42,183

Granny annexe - £87,183

Garden office - £10,183

Convert a Garage - £16,183

Garage - £18,683

Build a flat roof extension - £22,183

Build a dormer loft conversion - £42,183

Concrete foundations - £6,433

Convert a bungalow loft - £29,183

Convert a basement - £39,561