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Mandala Building Services
Mandala Building Services is a family-owned design and build maintenance company, encompassing everything from residential refurbishment to large-s...
"Loft conversion(dormer) with bedroom and en-suite bathroom on a bungalow and a rear single storey 5x4 flat roof extension" - AL2, job posted 09/10/26
Peter's Gutters
Peter Rourke
Trusted and professional extension builder in St Albans. Experienced in all extension buildering work and keeping within budget and on quote. Peter...
"Loft conversion" - WD7, job posted 13/09/26
A S G Developments - Herts LTD
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
"Single storey extension" - AL4, job posted 09/09/26
One Call Bathrooms
At One Call Bathrooms we can tailor our service to provide a bespoke service to all Landlords and Management Agents that will guar...
"Loft conversion" - WD7, job posted 30/08/26
Buyerz Trading
Buyerz Trading is an established and experienced local extension builder in St Albans. Please contact us for a free, no obligation quote and compet...
"Extend my behinddddddddddddddddddddddd" - AL4, job posted 09/01/26
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...
"Kitchen extension" - HARPENDEN, job posted 04/05/25
Advance Construction Solutions
Trusted and professional extension builder in St Albans. Experienced in all extension buildering work and keeping within budget and on quote. Advan...
"Loft conversion" - ST ALBANS, job posted 04/03/25
IC Builders
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
"Loft conversion" - ST ALBANS, job posted 15/09/24
London Elite Construction
London Elite Construction is an established extension buildering business in St Albans. We come highly recommended and provide competitive quotes f...
"Loft conversion" - AL4, job posted 24/06/24
BSL
BSL are here to help customers who need an Extension Builder in St Albans. We offer a competitive rate to complete all your extension buildering jo...
"Side return extension" - ST ALBANS, job posted 17/05/24
A1 Home Care Building Maintenance
A1 Home Care Building Maintenance are here to help customers who need an Extension Builder in St Albans. We offer a competitive rate to complete al...
"Single storey extension" - ST ALBANS, job posted 07/04/24
ARI Studio LTD
Need to find an Extension Builder near you for all your extension buildering work?
ARI Studio LTD provides a local, trusted extension build...
"Side return extension" - ST ALBANS, job posted 06/11/23
A.MILLS BUILDING SOLUTIONS LTD
Need an Extension Builder in St Albans? A.MILLS BUILDING SOLUTIONS LTD has been helping local clients (20 mile radius) with their extension builder...
SWB Construction Services
Trusted and professional extension builder in St Albans. Experienced in all extension buildering work and keeping within budget and on quote. SWB C...
EB Construction & Building Ltd
Edmond Begu
EB Construction & Building Ltd are here to help customers who need an Extension Builder in St Albans. We offer a competitive rate to complete all y...
J Pellow & Son Ltd
J Pellow & Son Ltd are here to help customers who need an Extension Builder in St Albans. We offer a competitive rate to complete all your extensio...
BBC
Relax... you have found a reliable extension builder in St Albans. BBC is a friendly and reliable company based in St Albans who consider no job as...
London Roofing Building Ltd
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Apollo Decor Ltd
Bradley Stevens
Experienced extension builder ready to quote for your work. Apollo Decor Ltd is the best extension builder in St Albans. No obligation free quotes ...
AVENUE BUILDERS
AVENUE BUILDERS is an established extension buildering business in St Albans. We come highly recommended and provide competitive quotes for your wo...
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 St Albans extension builders rates
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Extension Builders near St Albans | £43 | £272 |
| Extension Builders near Harpenden | £45 | £282 |
| Extension Builders near Hatfield | £42 | £266 |
| Extension Builders near Hemel Hempstead | £43 | £276 |
| Extension Builders near Dacorum | £42 | £275 |
| Extension Builders near Borehamwood | £42 | £271 |
| Extension Builders near Welwyn Garden City | £42 | £269 |
| Extension Builders near Bushey | £43 | £278 |
| Extension Builders near Watford | £43 | £280 |
| Extension Builders near Potters Bar | £43 | £273 |
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 - £26,184
Garden office - £10,184
Granny annexe - £87,184
Build a flat roof extension - £22,184
Convert a Garage - £16,184
Hip to gable loft conversion - £42,184
Convert a bungalow loft - £29,184
Build a dormer loft conversion - £42,184
Build a swimming pool - £81,184
Build a Mansard loft conversion - £52,184
Concrete foundations - £6,434
Underpin a building - £17,684
Two storey extension - £88,276
Convert a basement - £39,570
Side return extension - £43,570
Loft conversion - £35,475
Garage - £18,684
Single storey extension - £58,680
Outbuilding - £10,184
Install an RSJ - £2,384
Build a kitchen extension - £42,184
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