From £88,312
Need to find an Extension Builder near you for all your extension buildering work?
JAYEM BUILDING SERVICES LTD provides a local, trusted ex...
From £88,300
TB Projects is an established extension buildering business in HP9. We come highly recommended and provide competitive quotes for your work.
From £87,940
Relax... you have found a reliable extension builder in HP9. Kebbell Development Limited is a friendly and reliable company based in HP9 who consid...
From £88,516
Be Illuminated are here to help customers who need an Extension Builder in HP9. We offer a competitive rate to complete all your extension builderi...
From £88,468
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £87,856
Belvedere is an established and experienced local extension builder in HP9. Please contact us for a free, no obligation quote and competitive rates...
From £88,240
Need to find an Extension Builder near you for all your extension buildering work?
Loudwater Building Services provides a local, trusted ex...
From £88,504
Relax... you have found a reliable extension builder in HP9. J MCNAMEE J & J BUILDERS is a friendly and reliable company based in HP9 who consider ...
From £88,264
Experienced extension builder ready to quote for your work. G C JONES CONSTRUCTION CO LTD is the best extension builder in HP9. No obligation free ...
From £88,600
E E Construction is an established extension buildering business in HP9. We come highly recommended and provide competitive quotes for your work.

Costs range from £87,856 (Belvedere based in HP10) to £88,600 (E E Construction based in HP10), 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 Gerrards Cross | £37 | £244 |
| Two Storey Extension near Hazlemere | £34 | £235 |
| Two Storey Extension near High Wycombe | £34 | £237 |
| Two Storey Extension near Slough | £36 | £238 |
| Two Storey Extension near Maidenhead | £36 | £236 |
| Two Storey Extension near Rickmansworth | £37 | £241 |
| Two Storey Extension near Chesham | £36 | £237 |
| Two Storey Extension near Wycombe | £34 | £234 |
| Two Storey Extension near Windsor & Maidenhead | £36 | £238 |
| Two Storey Extension near Hillingdon | £56 | £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 - £17,700

Two storey extension - £88,300

Build a timber frame extension - £26,200

Build a swimming pool - £81,200

Single storey extension - £59,000

Side return extension - £43,750

Install an RSJ - £2,400

Outbuilding - £10,200

Build a Mansard loft conversion - £52,200

Loft conversion - £35,625

Build a kitchen extension - £42,200

Hip to gable loft conversion - £42,200

Granny annexe - £87,200

Garden office - £10,200

Convert a Garage - £16,200

Garage - £18,700

Build a flat roof extension - £22,200

Build a dormer loft conversion - £42,200

Concrete foundations - £6,450

Convert a bungalow loft - £29,200

Convert a basement - £39,750