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SH Enterprise
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
"Underpin a building" - N7, job posted 23/08/26
Torrington
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
London Trowel Co.
Relax... you have found a reliable extension builder in N1. London Trowel Co. is a friendly and reliable company based in N1 who consider no job as...
"Having planning permission, having structure drawing, about 40 square metres basement extension, looking for builders, want to be done ASAP." - N7, job posted 15/12/23
Thermodynamic Building Services Ltd
Trusted and professional extension builder in N1. Experienced in all extension buildering work and keeping within budget and on quote. Thermodynami...
First guard Roofing
Darren Bergin
Relax... you have found a reliable extension builder in N1. First guard Roofing is a friendly and reliable company based in N1 who consider no job ...
CK Constructions & Development Ltd
CK Constructions & Development Ltd is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a co...
GS Fabric Ltd
GS Fabric Ltd is an established and experienced local extension builder in N1. Please contact us for a free, no obligation quote and competitive ra...
JM Building Services
JM Building Services is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a competitive quot...
Andreas Thomas Demetri
Andreas Thomas Demetri is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a competitive qu...
Buildwiser
Buildwiser is a trusted extension builder serving customers in N1 and the surrounding area. Contact us to today to get a competitive quote for exte...
Carbin Canopy
Relax... you have found a reliable extension builder in N1. Carbin Canopy is a friendly and reliable company based in N1 who consider no job as too...
Amastic Roofing Building and Scaffolding Services Ltd
Trusted and professional extension builder in N1. Experienced in all extension buildering work and keeping within budget and on quote. Amastic Roof...
Brooks Builders & Decorators
London, N1
Brooks Builders & Decorators is an established extension buildering business in N1. We come highly recommended and provide competitive quotes for y...
DLER SINGH D S BUILDERS
DLER SINGH D S BUILDERS are here to help customers who need an Extension Builder in N1. We offer a competitive rate to complete all your extension ...
COMPLETE BUILDING COMPANY
Frankie
COMPLETE BUILDING COMPANY are here to help customers who need an Extension Builder in N1. We offer a competitive rate to complete all your extensio...
D B Duri Building
D B Duri Building are here to help customers who need an Extension Builder in N1. We offer a competitive rate to complete all your extension builde...
Q Lofts and Extensions
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
£43/hr
£268/day
FISKA DESIGN & BUILD
FISKA DESIGN & BUILD are here to help customers who need an Extension Builder in N1. We offer a competitive rate to complete all your extension bui...
£41/hr
£255/day
Maddison & Sons
Maddison & sons pride ourselves on attention to detail at the highest level.With an extensive background As Mains Contractors in construction fabri...
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- Post your job: Click "Get quotes" and briefly describe your job.
- Enter your details: We’ll match you with Extension Builders in N1. We’ll notify you via text or email when an Extension Builder is available to quote.
- Select your Extension Builder: Compare Extension Builders interested in working with you. You can use HaMuch to safely message local N1 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 - £26,224
Garden office - £10,224
Granny annexe - £87,224
Build a flat roof extension - £22,224
Convert a Garage - £16,224
Hip to gable loft conversion - £42,224
Convert a bungalow loft - £29,224
Build a dormer loft conversion - £42,224
Build a swimming pool - £81,224
Build a Mansard loft conversion - £52,224
Concrete foundations - £6,474
Underpin a building - £17,724
Two storey extension - £88,336
Convert a basement - £40,020
Side return extension - £44,020
Loft conversion - £35,850
Garage - £18,724
Single storey extension - £59,480
Outbuilding - £10,224
Install an RSJ - £2,424
Build a kitchen extension - £42,224
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