From £88,852
Experienced extension builder ready to quote for your work. Ashtons is the best extension builder in Harpenden. No obligation free quotes and many ...
From £88,468
Trusted and professional extension builder in Harpenden. Experienced in all extension buildering work and keeping within budget and on quote. Home ...
From £88,516
Harpenden, AL5
Trusted and professional extension builder in Harpenden. Experienced in all extension buildering work and keeping within budget and on quote. Peter...
From £88,408
Harpenden, AL5
Experienced extension builder ready to quote for your work. Priolotiling is the best extension builder in Harpenden. No obligation free quotes and ...
From £88,168
4siblings are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete all your extension builder...
From £88,096
We pride ourselves in offering transparent, collaborative construction services, defining your project, through planning and taking your project t...
From £88,600
Bob's Home Maintenance are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete all your exte...
From £88,036
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £88,792
Billy Homan set up Grain Property to provide high-quality design, seamless project delivery, and a commitment to excellent communication throughout...
From £87,976
Abalon is Western Canada’s leading foundation repair and basement waterproofing company, operating in the Edmonton area for over 40 years (50 yea...

Costs range from £87,976 (Abalon Construction based in ZZ99) to £88,852 (Ashtons based in Al5), 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 Harpenden | £86 | £315 |
| Two Storey Extension near St Albans | £63 | £288 |
| Two Storey Extension near Luton | £41 | £278 |
| Two Storey Extension near Hatfield | £64 | £283 |
| Two Storey Extension near Hemel Hempstead | £42 | £270 |
| Two Storey Extension near Welwyn Garden City | £42 | £268 |
| Two Storey Extension near Dacorum | £42 | £269 |
| Two Storey Extension near Hitchin | £43 | £283 |
| Two Storey Extension near Dunstable | £41 | £272 |
| Two Storey Extension near Stevenage | £44 | £282 |
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 - £17,761

Two storey extension - £88,391

Build a timber frame extension - £26,261

Build a swimming pool - £81,261

Single storey extension - £60,216

Side return extension - £44,434

Install an RSJ - £2,461

Outbuilding - £10,261

Build a Mansard loft conversion - £52,261

Loft conversion - £36,195

Build a kitchen extension - £42,261

Hip to gable loft conversion - £42,261

Granny annexe - £87,261

Garden office - £10,261

Convert a Garage - £16,261

Garage - £18,761

Build a flat roof extension - £22,261

Build a dormer loft conversion - £42,261

Concrete foundations - £6,511

Convert a bungalow loft - £29,261

Convert a basement - £40,434