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JJSR Construction Ltd
J Wijayamohan
Harrow, HA1
JJSR Construction Ltd is an established and experienced local extension builder in HA1. Please contact us for a free, no obligation quote and compe...
Mario Prajar Building Services
Mario Prajar Building Services is an established and experienced local extension builder in HA1. Please contact us for a free, no obligation quote ...
RLC Construction
RLC Construction are here to help customers who need an Extension Builder in HA1. We offer a competitive rate to complete all your extension builde...
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...
WHIPP CONSTRUCTION LTD
WHIPP CONSTRUCTION LTD is an established extension buildering business in HA1. We come highly recommended and provide competitive quotes for your w...
C & A Contractors
C & A Contractors is a trusted extension builder serving customers in HA1 and the surrounding area. Contact us to today to get a competitive quote ...
PERFORMA CONSTRUCTION LIMITED
Relax... you have found a reliable extension builder in HA1. PERFORMA CONSTRUCTION LIMITED is a friendly and reliable company based in HA1 who cons...
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...
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
Trusted and professional extension builder in HA1. Experienced in all extension buildering work and keeping within budget and on quote. A D C BUILD...
Cheapest builders for loft conversion in HA1
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 HA1 by posting your job to extension builders in HA1.
"Loft conversion" - HARROW ON THE HILL, job posted 03/07/25
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Estimates for common extension builder jobs in HA1;
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 - £17,650
Two storey extension - £88,226
Build a timber frame extension - £26,150
Build a swimming pool - £81,150
Single storey extension - £58,008
Side return extension - £43,192
Install an RSJ - £2,350
Outbuilding - £10,150
Build a Mansard loft conversion - £52,150
Loft conversion - £35,160
Build a kitchen extension - £42,150
Hip to gable loft conversion - £42,150
Granny annexe - £87,150
Garden office - £10,150
Convert a Garage - £16,150
Garage - £18,650
Build a flat roof extension - £22,150
Build a dormer loft conversion - £42,150
Concrete foundations - £6,400
Convert a bungalow loft - £29,150
Convert a basement - £39,192