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JJSR Construction Ltd
J Wijayamohan
JJSR Construction Ltd is an established and experienced local extension builder in HA3. Please contact us for a free, no obligation quote and compe...
RLC Construction
RLC Construction are here to help customers who need an Extension Builder in HA3. We offer a competitive rate to complete all your extension builde...
Chrysalis
Wealdstone, HA3
Chrysalis are here to help customers who need an Extension Builder in HA3. We offer a competitive rate to complete all your extension buildering jo...
PERFORMA CONSTRUCTION LIMITED
Relax... you have found a reliable extension builder in HA3. PERFORMA CONSTRUCTION LIMITED is a friendly and reliable company based in HA3 who cons...
Volton Building & Paving
Volton Building & Paving is a trusted extension builder serving customers in HA3 and the surrounding area. Contact us to today to get a competitive...
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...
BR Building Services Limited
BR Building Services Limited is a trusted extension builder serving customers in HA3 and the surrounding area. Contact us to today to get a competi...
A D C BUILDERS
Trusted and professional extension builder in HA3. Experienced in all extension buildering work and keeping within budget and on quote. A D C BUILD...
EUROCONTRACTOR LIMITED
Karsan Dabasia
Harrow, HA3
Trusted and professional extension builder in HA3. Experienced in all extension buildering work and keeping within budget and on quote. EUROCONTRAC...
Stamp Design & Build Ltd
Stamp Design & Build Ltd is a trusted extension builder serving customers in HA3 and the surrounding area. Contact us to today to get a competitive...
Cheapest builders for loft conversion in HA3
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 HA3 by posting your job to extension builders in HA3.
"Loft conversion" - HARROW ON THE HILL, job posted 03/07/25
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Estimates for common extension builder jobs in HA3;
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 - £17,619
Two storey extension - £88,179
Build a timber frame extension - £26,119
Build a swimming pool - £81,119
Single storey extension - £57,384
Side return extension - £42,841
Install an RSJ - £2,319
Outbuilding - £10,119
Build a Mansard loft conversion - £52,119
Loft conversion - £34,868
Build a kitchen extension - £42,119
Hip to gable loft conversion - £42,119
Granny annexe - £87,119
Garden office - £10,119
Convert a Garage - £16,119
Garage - £18,619
Build a flat roof extension - £22,119
Build a dormer loft conversion - £42,119
Concrete foundations - £6,369
Convert a bungalow loft - £29,119
Convert a basement - £38,841