From £2,680
Premium Design Construction Ltd. specialise in home remodelling and refurbishments from start to finish. Extensions, Loft conversion, bespoke carp...
From £2,064
Trusted and professional extension builder in Potters Bar. Experienced in all extension buildering work and keeping within budget and on quote. Adv...
From £2,456
Need to find an Extension Builder near you for all your extension buildering work?
JMB Design & Build provides a local, trusted extension b...
From £2,280
JMB Design & Build is a full service building construction company dedicated to building and improving residential and commercial structures accord...
From £2,096
Need to find an Extension Builder near you for all your extension buildering work?
TMP build solutions ltd provides a local, trusted extens...
From £2,200
TMP Build Solutions is a reputable building company that specialises in loft conversions and extensions. The team has a diverse range of trade skil...
From £2,104
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,312
Trusted and professional extension builder in Potters Bar. Experienced in all extension buildering work and keeping within budget and on quote. SWB...
From £2,528
BSL are here to help customers who need an Extension Builder in Potters Bar. We offer a competitive rate to complete all your extension buildering ...
From £2,464
London Elite Construction is an established extension buildering business in Potters Bar. We come highly recommended and provide competitive quotes...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Potters Bar it ranges from £2,064 (Advance Construction Solutions based in EN6) to £2,680 (Premium Design Construction LTD based in EN6).
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 Potters Bar by posting a job with HaMuch and we will send it to extension builders in Potters Bar.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Potters Bar | £43 | £273 |
| Install An RSJ near High Barnet | £43 | £272 |
| Install An RSJ near Hatfield | £64 | £283 |
| Install An RSJ near Cheshunt | £48 | £285 |
| Install An RSJ near Borehamwood | £42 | £270 |
| Install An RSJ near Welwyn Garden City | £42 | £268 |
| Install An RSJ near Muswell Hill | £44 | £273 |
| Install An RSJ near St Albans | £63 | £288 |
| Install An RSJ near Brent Cross | £43 | £272 |
| Install An RSJ near Hertford | £46 | £289 |
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 - £17,618

Two storey extension - £88,178

Build a timber frame extension - £26,118

Build a swimming pool - £81,118

Single storey extension - £57,368

Side return extension - £42,832

Install an RSJ - £2,318

Outbuilding - £10,118

Build a Mansard loft conversion - £52,118

Loft conversion - £34,860

Build a kitchen extension - £42,118

Hip to gable loft conversion - £42,118

Granny annexe - £87,118

Garden office - £10,118

Convert a Garage - £16,118

Garage - £18,618

Build a flat roof extension - £22,118

Build a dormer loft conversion - £42,118

Concrete foundations - £6,368

Convert a bungalow loft - £29,118

Convert a basement - £38,832