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Liviu Toma
Experienced extension builder ready to quote for your work. Liviu Toma is the best extension builder in DA18. No obligation free quotes and many ha...
Danni Building Services Ltd
Pedro
Need an Extension Builder in DA18? Danni Building Services Ltd has been helping local clients (10 mile radius) with their extension buildering jobs...
SV Roofing & Renovations
SV Roofing & Renovations are here to help customers who need an Extension Builder in DA18. We offer a competitive rate to complete all your extensi...
From £36,150
Great britton builders
David Britton
Relax... you have found a reliable extension builder in DA18. Great britton builders is a friendly and reliable company based in DA18 who consider ...
From £36,450
C B BUILDING CONSTRUCTION
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £36,675
Liam Kinsella Ltd
Need to find an Extension Builder near you for all your extension buildering work?
Liam Kinsella Ltd provides a local, trusted extension bu...
From £34,575
NEW BUILD MAINTENANCE LTD
Need an Extension Builder in DA18? NEW BUILD MAINTENANCE LTD has been helping local clients (10 mile radius) with their extension buildering jobs f...
From £33,600
Bex Building Services
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £33,900
Roger Matharoo
Roger Matharoo
We are family run buisness with great pedigree of enginners.
We have over 40 years knowledge in construction building and are very compe...
From £35,250
RSM BUILDING CONTRACTORS
Relax... you have found a reliable extension builder in DA18. RSM BUILDING CONTRACTORS is a friendly and reliable company based in DA18 who conside...
Cheapest builders for loft conversion in DA18
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 DA18 by posting your job to extension builders in DA18.
"Loft conversion" - ERITH, job posted 08/09/25
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Estimates for common extension builder jobs in DA18;
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 - £17,654
Two storey extension - £88,230
Build a timber frame extension - £26,154
Build a swimming pool - £81,154
Single storey extension - £58,072
Side return extension - £43,228
Install an RSJ - £2,354
Outbuilding - £10,154
Build a Mansard loft conversion - £52,154
Loft conversion - £35,190
Build a kitchen extension - £42,154
Hip to gable loft conversion - £42,154
Granny annexe - £87,154
Garden office - £10,154
Convert a Garage - £16,154
Garage - £18,654
Build a flat roof extension - £22,154
Build a dormer loft conversion - £42,154
Concrete foundations - £6,404
Convert a bungalow loft - £29,154
Convert a basement - £39,228