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Available extension builders in Calstock reply
Select your affordable Calstock extension builder
From £2,328
Stephen Trevillion
Member since October 2026
Minor and major building works
Need an Extension Builder in Calstock? A1 CONSTRUCTION & MAINTENCE has been helping local clients (20 mile radius) with their extension buildering...
Relax... you have found a reliable extension builder in Calstock. MJR Construction SW Ltd is a friendly and reliable company based in Calstock who ...
Need to find an Extension Builder near you for all your extension buildering work?
STEVENS BUILDING & MAINT LTD provides a local, trusted e...
From £1,832
MICHAEL P PHILP is an established and experienced local extension builder in Calstock. Please contact us for a free, no obligation quote and compet...
From £2,352
360 Construction are here to help customers who need an Extension Builder in Calstock. We offer a competitive rate to complete all your extension b...
From £1,984
TJ FRIEND CONSTRUCTION are here to help customers who need an Extension Builder in Calstock. We offer a competitive rate to complete all your exten...
From £2,144
Trusted and professional extension builder in Calstock. Experienced in all extension buildering work and keeping within budget and on quote. CONSTR...
From £2,048
A Rated Builders is an established and experienced local extension builder in Calstock. Please contact us for a free, no obligation quote and compe...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Calstock it ranges from £1,832 (MICHAEL P PHILP based in PL12) to £2,488 (Brian C Credicott based in PL19).
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 Calstock by posting a job with HaMuch and we will send it to extension builders in Calstock.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Plymouth | £30 | £230 |
| Install An RSJ near Teignbridge | £27 | £260 |
| Install An RSJ near Newton Abbot | £27 | £236 |
| Install An RSJ near St Austell | £38 | £245 |
| Install An RSJ near Paignton | £27 | £222 |
| Install An RSJ near Torbay | £27 | £223 |
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 - £17,422

Two storey extension - £87,884

Build a timber frame extension - £25,922

Build a swimming pool - £80,922

Single storey extension - £53,448

Side return extension - £40,627

Install an RSJ - £2,122

Outbuilding - £9,922

Build a Mansard loft conversion - £51,922

Loft conversion - £33,023

Build a kitchen extension - £41,922

Hip to gable loft conversion - £41,922

Granny annexe - £86,922

Garden office - £9,922

Convert a Garage - £15,922

Garage - £18,422

Build a flat roof extension - £21,922

Build a dormer loft conversion - £41,922

Concrete foundations - £6,172

Convert a bungalow loft - £28,922

Convert a basement - £36,627