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JJSR Construction Ltd
J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in Harrow. Please contact us for a free, no obligation quote and co...
"Kitchen extension" - UB6, job posted 15/05/26
Mario Prajar Building Services
Mario Prajar Building Services is an established and experienced local extension builder in Harrow. Please contact us for a free, no obligation quo...
"Loft conversion" - HARROW, job posted 04/04/26
RLC Construction
RLC Construction are here to help customers who need an Extension Builder in Harrow. We offer a competitive rate to complete all your extension bui...
"Loft conversion" - HARROW ON THE HILL, job posted 29/09/25
J K GENERAL BUILDING LTD
Need to find an Extension Builder near you for all your extension buildering work?
J K GENERAL BUILDING LTD provides a local, trusted exten...
"Garden office" - HARROW ON THE HILL, job posted 20/07/25
WHIPP CONSTRUCTION LTD
WHIPP CONSTRUCTION LTD is an established extension buildering business in Harrow. We come highly recommended and provide competitive quotes for you...
"Loft conversion" - HARROW ON THE HILL, job posted 05/07/25
C & A Contractors
C & A Contractors is a trusted extension builder serving customers in Harrow and the surrounding area. Contact us to today to get a competitive quo...
"Loft conversion" - HARROW ON THE HILL, job posted 07/03/25
PERFORMA CONSTRUCTION LIMITED
Relax... you have found a reliable extension builder in Harrow. PERFORMA CONSTRUCTION LIMITED is a friendly and reliable company based in Harrow wh...
"Dormer loft conversion" - HARROW, job posted 14/08/24
Mamma V's Caribbean and English Cuisine
UK Food
Need to find an Extension Builder near you for all your extension buildering work?
Mamma V's Caribbean and English Cuisine provides a local...
"Loft conversion" - HARROW, job posted 09/08/24
Platinum Premier Projects & Premier Electrics
Platinum Electrics is a Branch off Platinum Premier Projects who deal in all types of construction projects. Platinum Electrics are based in London...
A D C BUILDERS
Harrow, HA1
Trusted and professional extension builder in Harrow. Experienced in all extension buildering work and keeping within budget and on quote. A D C BU...
EUROCONTRACTOR LIMITED
Karsan Dabasia
Trusted and professional extension builder in Harrow. Experienced in all extension buildering work and keeping within budget and on quote. EUROCONT...
Stamp Design & Build Ltd
Harrow, HA1
Stamp Design & Build Ltd is a trusted extension builder serving customers in Harrow and the surrounding area. Contact us to today to get a competit...
Marku Builders Ltd
Marku Builders Ltd is an established extension buildering business in Harrow. We come highly recommended and provide competitive quotes for your wo...
MONTY MCCARTHY BUILDERS
Need an Extension Builder in Harrow? MONTY MCCARTHY BUILDERS has been helping local clients (10 mile radius) with their extension buildering jobs f...
P Connolly Builders
Trusted and professional extension builder in Harrow. Experienced in all extension buildering work and keeping within budget and on quote. P Connol...
Splendid Design
We are a team of professionals who specialise in: Kitchen Installation Kitchen and Bathroom refurbishment Bespoke furniture for: Kitchen Livi...
O DAMIEAN BUILDING SERVICES
Experienced extension builder ready to quote for your work. O DAMIEAN BUILDING SERVICES is the best extension builder in Harrow. No obligation free...
BUILDING SERVICES (UK) LTD
Experienced extension builder ready to quote for your work. BUILDING SERVICES (UK) LTD is the best extension builder in Harrow. No obligation free ...
Eddybuild Contractors Ltd
Eddybuild Contractors Ltd is an established and experienced local extension builder in Harrow. Please contact us for a free, no obligation quote an...
PANCON CONSTRUCTION LIMITED
Relax... you have found a reliable extension builder in Harrow. PANCON CONSTRUCTION LIMITED is a friendly and reliable company based in Harrow who ...
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- Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local Harrow 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 - £26,184
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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