From £88,288
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in SG18. We offer a competitive rate to complete all your exten...
From £88,252
Relax... you have found a reliable extension builder in SG18. Imogen Jack is a friendly and reliable company based in SG18 who consider no job as t...
From £88,204
Trusted and professional extension builder in SG18. Experienced in all extension buildering work and keeping within budget and on quote. J. WATSON ...
From £87,772
Need an Extension Builder in SG18? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £88,180
For more than 10 years, North Hertfordshire Construction LTD have been the name you can trust when it comes to building and development! We are kno...
From £88,396
Relax... you have found a reliable extension builder in SG18. Applewood Design and Build Ltd is a friendly and reliable company based in SG18 who c...
From £88,468
Experienced extension builder ready to quote for your work. Bricklayers is the best extension builder in SG18. No obligation free quotes and many h...
From £88,540
Experienced extension builder ready to quote for your work. Specialist Building Refurbishm is the best extension builder in SG18. No obligation fre...
From £88,432
Realise Your Luxury Dream Home With The Design And Build Partner You Can Trust.At MG Design & Build we have over 25 years of experience in the cons...
From £88,216
A.S. OHM Electrics Ltd is a trusted extension builder serving customers in SG18 and the surrounding area. Contact us to today to get a competitive ...

Costs range from £87,772 (R&J Building Services Ltd based in SG17) to £88,540 (Specialist Building Refurbishm based in SG16), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Two Storey Extension near Biggleswade | £41 | £268 |
| Two Storey Extension near Letchworth | £44 | £283 |
| Two Storey Extension near North Hertfordshire | £44 | £283 |
| Two Storey Extension near Kempston | £44 | £273 |
| Two Storey Extension near Bedford | £45 | £278 |
| Two Storey Extension near South Bedfordshire | £45 | £278 |
| Two Storey Extension near Mid Bedfordshire | £42 | £276 |
| Two Storey Extension near Ampthill | £38 | £258 |
| Two Storey Extension near St Neots | £51 | £318 |
| Two Storey Extension near Hitchin | £43 | £283 |
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 - £17,683

Two storey extension - £88,275

Build a timber frame extension - £26,183

Build a swimming pool - £81,183

Single storey extension - £58,664

Side return extension - £43,561

Install an RSJ - £2,383

Outbuilding - £10,183

Build a Mansard loft conversion - £52,183

Loft conversion - £35,468

Build a kitchen extension - £42,183

Hip to gable loft conversion - £42,183

Granny annexe - £87,183

Garden office - £10,183

Convert a Garage - £16,183

Garage - £18,683

Build a flat roof extension - £22,183

Build a dormer loft conversion - £42,183

Concrete foundations - £6,433

Convert a bungalow loft - £29,183

Convert a basement - £39,561