From £2,632
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,264
Experienced extension builder ready to quote for your work. Cornerstone is the best extension builder in Regent Street. No obligation free quotes a...
From £2,600
Starfish Properties is a trusted extension builder serving customers in Regent Street and the surrounding area. Contact us to today to get a compet...
From £2,536
Big Mamma is an established and experienced local extension builder in Regent Street. Please contact us for a free, no obligation quote and competi...
From £2,288
Dominic Payte - Design & Build is an established extension buildering business in Regent Street. We come highly recommended and provide competitive...
From £2,456
Originally established in 1996 ELV8 has set the highest standards within the building industry, achieving success by winning numerous gold awards f...
From £2,144
Hestia Contractors Ltd are here to help customers who need an Extension Builder in Regent Street. We offer a competitive rate to complete all your ...
From £2,240
Independent construction company we have wide range of experience, including newconstruction, renovation, design build and retail stores. We provid...
From £2,432
We are specialised in: demolition services, foundation services, property extension, general bricklaying, internal renovation and configuration, ca...
From £2,672
We are a Design and Build Company, based in London.We focus on super prime and luxury residential renovations in and around London and internationa...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Regent Street it ranges from £2,144 (Hestia Contractors Ltd based in W1B) to £2,672 (We Love Build based in W1J).
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 Regent Street by posting a job with HaMuch and we will send it to extension builders in Regent 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 - £17,726

Two storey extension - £88,340

Build a timber frame extension - £26,226

Build a swimming pool - £81,226

Single storey extension - £59,528

Side return extension - £44,047

Install an RSJ - £2,426

Outbuilding - £10,226

Build a Mansard loft conversion - £52,226

Loft conversion - £35,873

Build a kitchen extension - £42,226

Hip to gable loft conversion - £42,226

Granny annexe - £87,226

Garden office - £10,226

Convert a Garage - £16,226

Garage - £18,726

Build a flat roof extension - £22,226

Build a dormer loft conversion - £42,226

Concrete foundations - £6,476

Convert a bungalow loft - £29,226

Convert a basement - £40,047