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J Pellow & Son Ltd
Watford, WD25
J Pellow & Son Ltd are here to help customers who need an Extension Builder in WD25. We offer a competitive rate to complete all your extension bui...
"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
T N Roofing
T N Roofing is an established extension buildering business in WD25. We come highly recommended and provide competitive quotes for your work.
"Loft conversion" - WD24, job posted 07/12/25
Conversion Property and Electrical Services
Our building services company Conversion Property and Electrical Services has 17 years of experience in the industry. We have been helping customer...
"Hip to gable loft conversion" - WD24, job posted 28/01/25
Tonybuild
Relax... you have found a reliable extension builder in WD25. Tonybuild is a friendly and reliable company based in WD25 who consider no job as too...
"Loft conversion" - WD17, job posted 27/12/24
Eeoc
Emilian Czeiszperger
Watford, WD25
Hello I am Emilian , the proud owner of Eeoc Ltd, A little about me With many happy and returning customers over the last 14 years, y...
"Side return extension" - WD17, job posted 05/03/24
£37/hr
£235/day
Crown Building
Relax... you have found a reliable extension builder in WD25. Crown Building is a friendly and reliable company based in WD25 who consider no job a...
£38/hr
£239/day
Progressive Design London
Experienced extension builder ready to quote for your work. Progressive Design London is the best extension builder in WD25. No obligation free quo...
£52/hr
£306/day
DSB Premier Construction Limited
Homeowners look no further if you want a qualified extension builder to work in your home. DSB Premier Construction Limited are tidy and neat, prov...
£43/hr
£268/day
Primrose Projects
Primrose Projects is an established and experienced local extension builder in WD25. Please contact us for a free, no obligation quote and competit...
£45/hr
£283/day
EMA Contractors
Need an Extension Builder in WD25? EMA Contractors has been helping local clients (20 mile radius) with their extension buildering jobs for many ye...
£41/hr
£261/day
PM HOBBS BUILDING SERVICES
Need an Extension Builder in WD25? PM HOBBS BUILDING SERVICES has been helping local clients (10 mile radius) with their extension buildering jobs ...
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- Enter your details: We’ll match you with Extension Builders in WD25. We’ll notify you via text or email when an Extension Builder is available to quote.
- Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local WD25 Extension Builders or phone them directly - you’re in control!
Local Extension Builders in London Boroughs
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 - £26,224
Garden office - £10,224
Granny annexe - £87,224
Build a flat roof extension - £22,224
Convert a Garage - £16,224
Hip to gable loft conversion - £42,224
Convert a bungalow loft - £29,224
Build a dormer loft conversion - £42,224
Build a swimming pool - £81,224
Build a Mansard loft conversion - £52,224
Concrete foundations - £6,474
Underpin a building - £17,724
Two storey extension - £88,336
Convert a basement - £40,020
Side return extension - £44,020
Loft conversion - £35,850
Garage - £18,724
Single storey extension - £59,480
Outbuilding - £10,224
Install an RSJ - £2,424
Build a kitchen extension - £42,224
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