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Peter's Gutters
Peter Rourke
Harpenden, AL5
Trusted and professional extension builder in Harpenden. Experienced in all extension buildering work and keeping within budget and on quote. Peter...
"Single storey extension" - AL4, job posted 09/09/26
Bacan's cleaning painting and decorating
Elena nuta Radu
Plumbing, painting exterior, interior, extensions, plastering, skiming, carpeting, Flooring, you can ask us ..
"Extend my behinddddddddddddddddddddddd" - AL4, job posted 09/01/26
Greg-Bud
Need to find an Extension Builder near you for all your extension buildering work?
Greg-Bud provides a local, trusted extension buildering ...
"Kitchen extension" - HARPENDEN, job posted 04/05/25
Top Notch Tradesmen
Top Notch Tradesmen is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and c...
"Loft conversion" - ST ALBANS, job posted 04/03/25
A.J Builders
A.J Builders is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and competit...
"Loft conversion" - ST ALBANS, job posted 15/09/24
A S G Developments - Herts LTD
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
"Hi I was hoping to get a quote for the renovation of an entire house. It’s about 60 years old. I would need: 1. potential plastering of walls, r 2. removal of an existing kitchen & fitting of new 3. Removal of 1 bathroom & fitting of 2 4. garage conversion 5. flooring & carpet, ..." - AL5, job posted 05/09/24
Buyerz Trading
Buyerz Trading is an established and experienced local extension builder in Harpenden. Please contact us for a free, no obligation quote and compet...
"Side return extension" - ST ALBANS, job posted 17/05/24
R. Newman Construction
Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...
"Single storey extension" - ST ALBANS, job posted 07/04/24
IC Builders
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
"Side return extension" - ST ALBANS, job posted 06/11/23
A1 Home Care Building Maintenance
A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete al...
A.MILLS BUILDING SOLUTIONS LTD
Need an Extension Builder in Harpenden? A.MILLS BUILDING SOLUTIONS LTD has been helping local clients (20 mile radius) with their extension builder...
EB Construction & Building Ltd
Edmond Begu
EB Construction & Building Ltd are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete all y...
FULLERS BUILDING SERVICES
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Amcell Renovations
Trusted and professional extension builder in Harpenden. Experienced in all extension buildering work and keeping within budget and on quote. Amcel...
G&D Builders Ltd
We use only the highest quality products, and you can rest assured knowing that we are fully certified and registered with the relevant authorities...
MA Gower
Need an Extension Builder in Harpenden? MA Gower has been helping local clients (20 mile radius) with their extension buildering jobs for many year...
Apollo Decor Ltd
Bradley Stevens
Experienced extension builder ready to quote for your work. Apollo Decor Ltd is the best extension builder in Harpenden. No obligation free quotes ...
BOXMOOR BLDG & CARP SERVICES
Dave Reilly
BOXMOOR BLDG & CARP SERVICES is a trusted extension builder serving customers in Harpenden and the surrounding area. Contact us to today to get a c...
BARRETT LESLIE BUILDING
BARRETT LESLIE BUILDING are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete all your ext...
Simon Johnson & Sons Builders
Simon Johnson
Simon Johnson & Sons Builders are here to help customers who need an Extension Builder in Harpenden. We offer a competitive rate to complete all yo...
The most important thing is do avoid handing over cash or paying large sums in advance. Be wary of paying cash for a cheaper job, i.e. to avoid VAT, you may be going down a slippery slope of not doing things properly which may eventually mean your job is also not done properly.
Agree when you intend to pay, ideally after you are satisfied with the completed job. If it is a big job agree a schedule of staged payments which is fair to both parties.
To avoid bad tradespeople and to ensure you can find them should they not answer a mobile;
- Get proper contact details and check them yourself
- Check if the company is verified on the Companies House website
- Get phone details, ideally a land line or 0800 number and check it
- Get a physical office address
Get quotes in writing by email or in person if possible. Getting quotes online or by text is ok (make sure you accept the offer by replying). For large projects make a written agreement, schedule of works and snagging plans as part of a working document. Also;
- Agree expected quality of workmanship and materials in advance
- When will work start and when will project be finished, what happens if project over runs ?
- How long is the guarantee on work and materials eg 12 months
- Discuss onsite behaviour in advance (no smoking, swearing or using mobile phones for non-work purposes)
- Agree that your Extension Builder will remove all debris and rubbish and what level of tidying up you want after job
Compare Harpenden extension builders rates
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Extension Builders near Harpenden | £45 | £282 |
| Extension Builders near St Albans | £43 | £272 |
| Extension Builders near Luton | £42 | £279 |
| Extension Builders near Hatfield | £42 | £266 |
| Extension Builders near Hemel Hempstead | £43 | £276 |
| Extension Builders near Welwyn Garden City | £42 | £269 |
| Extension Builders near Dacorum | £42 | £275 |
| Extension Builders near Hitchin | £43 | £283 |
| Extension Builders near Dunstable | £41 | £274 |
| Extension Builders near Stevenage | £44 | £282 |
Job estimates from extension builders near you
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.
Build a timber frame extension - £26,232
Garden office - £10,232
Granny annexe - £87,232
Build a flat roof extension - £22,232
Convert a Garage - £16,232
Hip to gable loft conversion - £42,232
Convert a bungalow loft - £29,232
Build a dormer loft conversion - £42,232
Build a swimming pool - £81,232
Build a Mansard loft conversion - £52,232
Concrete foundations - £6,482
Underpin a building - £17,732
Two storey extension - £88,348
Convert a basement - £40,110
Side return extension - £44,110
Loft conversion - £35,925
Garage - £18,732
Single storey extension - £59,640
Outbuilding - £10,232
Install an RSJ - £2,432
Build a kitchen extension - £42,232
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