Arshad Ali
We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...
Luke Rees
General Building Services (Southampton) Ltd is a trusted extension builder serving customers in Romsey and the surrounding area. Contact us to toda...
Experienced extension builder ready to quote for your work. CSY Construction Ltd is the best extension builder in Romsey. No obligation free quotes...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Bailey Construction Services are here to help customers who need an Extension Builder in Romsey. We offer a competitive rate to complete all your e...
Experienced extension builder ready to quote for your work. Grant Construction is the best extension builder in Romsey. No obligation free quotes a...
Need an Extension Builder in Romsey? T & S Construction has been helping local clients (20 mile radius) with their extension buildering jobs for ma...
Trowel On is an established extension buildering business in Romsey. We come highly recommended and provide competitive quotes for your work.
The business offers a full design service for both kitchens and bathrooms.We work with you to make the best use of your space and find prod...
Alex Molyneux
Romsey, SO51
We specialise in Epoxy Resin and Polyurethane floor coatings and screeds (very durable and seamless flooring), designed for retail, factories, manu...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Romsey it ranges from £1,048 (Floortrak Limited based in SO51) to £2,392 (AAConcepts based in SO14).
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 Romsey by posting a job with HaMuch and we will send it to extension builders in Romsey.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Romsey | £32 | £230 |
| Install An RSJ near Chandler's Ford | £34 | £245 |
| Install An RSJ near Totton | £34 | £243 |
| Install An RSJ near Eastleigh | £34 | £244 |
| Install An RSJ near Southampton | £34 | £243 |
| Install An RSJ near Test Valley | £37 | £261 |
| Install An RSJ near New Forest | £32 | £245 |
| Install An RSJ near Winchester | £39 | £283 |
| Install An RSJ near Hedge End | £34 | £244 |
| Install An RSJ near Locks Heath | £33 | £240 |
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 - £17,405

Two storey extension - £87,857

Build a timber frame extension - £25,905

Build a swimming pool - £80,905

Single storey extension - £53,096

Side return extension - £40,429

Install an RSJ - £2,105

Outbuilding - £9,905

Build a Mansard loft conversion - £51,905

Loft conversion - £32,858

Build a kitchen extension - £41,905

Hip to gable loft conversion - £41,905

Granny annexe - £86,905

Garden office - £9,905

Convert a Garage - £15,905

Garage - £18,405

Build a flat roof extension - £21,905

Build a dormer loft conversion - £41,905

Concrete foundations - £6,155

Convert a bungalow loft - £28,905

Convert a basement - £36,429