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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...
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.
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...
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...
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...
From £32,625
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...
From £32,925
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...
From £35,100
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...
From £36,225
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...
From £34,575
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 ...
Cheapest builders for loft conversion in WD25
Comparing extension builders estimates for Loft conversion gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost of a loft conversion in WD25 by posting your job to extension builders in WD25.
"Loft conversion" - WD24, job posted 12/07/25
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Estimates for common extension builder jobs in WD25;
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 - £17,698
Two storey extension - £88,296
Build a timber frame extension - £26,198
Build a swimming pool - £81,198
Single storey extension - £58,952
Side return extension - £43,723
Install an RSJ - £2,398
Outbuilding - £10,198
Build a Mansard loft conversion - £52,198
Loft conversion - £35,603
Build a kitchen extension - £42,198
Hip to gable loft conversion - £42,198
Granny annexe - £87,198
Garden office - £10,198
Convert a Garage - £16,198
Garage - £18,698
Build a flat roof extension - £22,198
Build a dormer loft conversion - £42,198
Concrete foundations - £6,448
Convert a bungalow loft - £29,198
Convert a basement - £39,723