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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
JJSR Construction Ltd
J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in Radlett. Please contact us for a free, no obligation quote and c...
"Loft conversion" - WD7, job posted 13/09/26
Rafix Building
Rafal Szczepanski
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
"Loft conversion" - WD7, job posted 30/08/26
AV Home Improvements
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...
"Loft conversion quote" - EN5, job posted 20/06/26
Sharp Building Ltd
Sharp Building Ltd is an established and experienced local extension builder in Radlett. Please contact us for a free, no obligation quote and comp...
"Loft conversion" - EN5, job posted 20/06/26
RLC Construction
RLC Construction are here to help customers who need an Extension Builder in Radlett. We offer a competitive rate to complete all your extension bu...
"Loft conversion" - WD19, job posted 07/05/26
Building Service and Support Ltd
Relax... you have found a reliable extension builder in Radlett. Building Service and Support Ltd is a friendly and reliable company based in Radle...
"Looking for a loft conversion with a flat shed dormer (1 bed and bathroom) i have plans which have been submitted so looking for quotes" - WD24, job posted 26/12/25
COMPLETE CIVIL ENGINEERING
Ciaran Feeney
Need to find an Extension Builder near you for all your extension buildering work?
COMPLETE CIVIL ENGINEERING provides a local, trusted ext...
"Loft conversion" - WD24, job posted 07/12/25
Chrysalis
Chrysalis are here to help customers who need an Extension Builder in Radlett. We offer a competitive rate to complete all your extension builderin...
"Side return extension" - WD18, job posted 09/10/25
PERFORMA CONSTRUCTION LIMITED
Relax... you have found a reliable extension builder in Radlett. PERFORMA CONSTRUCTION LIMITED is a friendly and reliable company based in Radlett ...
"I am looking for quotes for a small rear extension on a terraced property in WD18, Watford. The extension will be built directly behind the existing kitchen and will house a toilet, stand-up shower, and a small hand basin. Existing Details: Existing Kitchen Width (internal): 2.01 metres ..." - WD18, job posted 07/08/25
Volton Building & Paving
Volton Building & Paving is a trusted extension builder serving customers in Radlett and the surrounding area. Contact us to today to get a competi...
"I am looking for quotes for a small rear extension on a terraced property in WD18, Watford. The extension will be built directly behind the existing kitchen and will house a toilet, stand-up shower, and a small hand basin. Existing Details: Property Type: Mid-terrace house Location: WD18,..." - WATFORD, job posted 07/08/25
New Finishes
New Finishes is a trusted extension builder serving customers in Radlett and the surrounding area. Contact us to today to get a competitive quote f...
"Single storey extension" - BOREHAMWOOD, job posted 05/07/25
Pavillion Building Services
Relax... you have found a reliable extension builder in Radlett. Pavillion Building Services is a friendly and reliable company based in Radlett wh...
"Single storey extension" - WATFORD, job posted 26/05/25
Homeland Building Ltd
Homeland Building Ltd is a trusted extension builder serving customers in Radlett and the surrounding area. Contact us to today to get a competitiv...
"Loft conversion" - ST ALBANS, job posted 04/03/25
Wittick Building Ltd
Wittick Building Ltd is a trusted extension builder serving customers in Radlett and the surrounding area. Contact us to today to get a competitive...
"Hip to gable loft conversion" - WD24, job posted 28/01/25
A S G Developments - Herts LTD
Amarjeet Gill
Architecture and Construction all in one place.
FREE DRAWINGS for all projects we build.
"Loft conversion" - WD17, job posted 27/12/24
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...
"Two storey extension" - WATFORD, job posted 16/12/24
Buyerz Trading
Buyerz Trading is an established and experienced local extension builder in Radlett. Please contact us for a free, no obligation quote and competit...
"Loft conversion" - ST ALBANS, job posted 15/09/24
Advance Construction Solutions
Trusted and professional extension builder in Radlett. Experienced in all extension buildering work and keeping within budget and on quote. Advance...
"Loft conversion" - AL4, job posted 24/06/24
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...
"Side return extension" - ST ALBANS, job posted 17/05/24
Compare Radlett extension builders rates
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Extension Builders near Borehamwood | £42 | £271 |
| Extension Builders near Bushey | £43 | £278 |
| Extension Builders near Watford | £43 | £280 |
| Extension Builders near St Albans | £43 | £272 |
| Extension Builders near High Barnet | £43 | £272 |
| Extension Builders near Potters Bar | £43 | £273 |
| Extension Builders near Hatfield | £42 | £266 |
| Extension Builders near Harrow | £43 | £270 |
| Extension Builders near Brent Cross | £43 | £273 |
| Extension Builders near Rickmansworth | £43 | £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 - £26,200
Garden office - £10,200
Granny annexe - £87,200
Build a flat roof extension - £22,200
Convert a Garage - £16,200
Hip to gable loft conversion - £42,200
Convert a bungalow loft - £29,200
Build a dormer loft conversion - £42,200
Build a swimming pool - £81,200
Build a Mansard loft conversion - £52,200
Concrete foundations - £6,450
Underpin a building - £17,700
Two storey extension - £88,300
Convert a basement - £39,750
Side return extension - £43,750
Loft conversion - £35,625
Garage - £18,700
Single storey extension - £59,000
Outbuilding - £10,200
Install an RSJ - £2,400
Build a kitchen extension - £42,200
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