From £2,704
We are a local, small London business moving from B2B to B2C Construction Design & Build Market
From £2,688
Welcome to Novo Solutions Group Ltd - Your premier building construction and renovation specialists. Based in the UK, Novo Solutions Group...
From £2,600
Open Space London are here to help customers who need an Extension Builder in Primrose Hill. We offer a competitive rate to complete all your exten...
From £2,184
Superior Project Ltd delivers a wide range of services related to construction and renovation. We list just a selection here.House ExtensionsFull ...
From £2,456
Kigumi ltd is an established and experienced local extension builder in Primrose Hill. Please contact us for a free, no obligation quote and compet...
From £2,296
We specialize in private and commercial residential construction and operate as a general contracting and full-service project management company w...
From £2,344
BUILD SPACE is an established extension buildering business in Primrose Hill. We come highly recommended and provide competitive quotes for your wo...
From £2,104
Relax... you have found a reliable extension builder in Primrose Hill. BDCM Design & Build is a friendly and reliable company based in Primrose Hil...
From £2,432
Hampstead Design Hub are here to help customers who need an Extension Builder in Primrose Hill. We offer a competitive rate to complete all your ex...
From £2,416
Our building services company RY Interior Ltd have six years’ experience of helping customers in London and the surrounding area by providing pro...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Primrose Hill it ranges from £2,104 (BDCM Design & Build based in NW3) to £2,704 (AVmen Construction based in NW3).
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 Primrose Hill by posting a job with HaMuch and we will send it to extension builders in Primrose Hill.
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 - £17,722

Two storey extension - £88,334

Build a timber frame extension - £26,222

Build a swimming pool - £81,222

Single storey extension - £59,448

Side return extension - £44,002

Install an RSJ - £2,422

Outbuilding - £10,222

Build a Mansard loft conversion - £52,222

Loft conversion - £35,835

Build a kitchen extension - £42,222

Hip to gable loft conversion - £42,222

Granny annexe - £87,222

Garden office - £10,222

Convert a Garage - £16,222

Garage - £18,722

Build a flat roof extension - £22,222

Build a dormer loft conversion - £42,222

Concrete foundations - £6,472

Convert a bungalow loft - £29,222

Convert a basement - £40,002