From £2,704
CityGate Homes specialises in full refurbishment projects and interior design services. We offer fully integrated services spanning the entire scop...
From £2,608
The firm’s design portfolio is very diverse ranging from residential, commercial, educational and many other types of developments. NArch has bee...
From £2,576
CK Constructions & Development Ltd is a trusted extension builder serving customers in St Pancras and the surrounding area. Contact us to today to ...
From £2,600
FLAVIA CONDE is an established and experienced local extension builder in St Pancras. Please contact us for a free, no obligation quote and competi...
From £2,384
Need to find an Extension Builder near you for all your extension buildering work?
Pacho Build Ltd provides a local, trusted extension buil...
From £2,672
Longland Construction LTD is a high end refurbishment contractor and sub contractor company in London and surrounding areas. Woodwork, painting and...
From £2,144
Relax... you have found a reliable extension builder in St Pancras. Otto & Mensah Build is a friendly and reliable company based in St Pancras who ...
From £2,416
Buildwiser is a trusted extension builder serving customers in St Pancras and the surrounding area. Contact us to today to get a competitive quote ...
From £2,496
Need an Extension Builder in St Pancras? DeHome Studio has been helping local clients (5 mile radius) with their extension buildering jobs for many...
From £2,568
Atlant Construction is an established extension buildering business in St Pancras. 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 St Pancras it ranges from £2,144 (Otto & Mensah Build based in WC1N) to £2,704 (Citygate based in WC1H).
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 St Pancras by posting a job with HaMuch and we will send it to extension builders in St Pancras.
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 - £17,817

Two storey extension - £88,475

Build a timber frame extension - £26,317

Build a swimming pool - £81,317

Single storey extension - £61,336

Side return extension - £45,064

Install an RSJ - £2,517

Outbuilding - £10,317

Build a Mansard loft conversion - £52,317

Loft conversion - £36,720

Build a kitchen extension - £42,317

Hip to gable loft conversion - £42,317

Granny annexe - £87,317

Garden office - £10,317

Convert a Garage - £16,317

Garage - £18,817

Build a flat roof extension - £22,317

Build a dormer loft conversion - £42,317

Concrete foundations - £6,567

Convert a bungalow loft - £29,317

Convert a basement - £41,064