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The00Company Ltd
Homeowners look no further if you want a qualified extension builder to work in your home. The00Company Ltd are tidy and neat, providing a quality ...
"Underpinning" - EN2, job posted 19/12/25
EVS ARCHITECTURE & CONSTRUCTION LTD
HOW WE WORK?We are here to design the best places!Our experience includes projects all over the world, from small scaled projects to large resident...
"Rear dormer loft extension to provide 2 bedrooms and 1 shower room on a semi-detached property in Enfield." - EN2, job posted 15/07/25
AGK Building Services Ltd
AGK Building Services Ltd is a small family-run business with more than 20 years' experience in the building services industry. We have a team of d...
"Rear dormer loft extension to provide 2 bedrooms and 1 shower room on a semi-detached property in Enfield" - EN2, job posted 15/07/25
Renova PMC
Renova PMC - bespoke construction, interior designers
"Loft extension and ground floor extension" - EN2, job posted 04/12/23
Abarth Construction Ltd
We are an experienced team dedicated to designing property in a way that is both beautiful and practical. For most people buying a property is an e...
£44/hr
£271/day
B&B London Construction Ltd
Arben Neza (Benny)
We are focused on delivering high quality loft conversions, house extensions, full or partial house refurbishment, also maximising the full potent...
£45/hr
£282/day
S E H BUILDERS LTD
Winchmore Hill, N21
Need to find an Extension Builder near you for all your extension buildering work?
S E H BUILDERS LTD provides a local, trusted extension b...
£40/hr
£248/day
TIPS CONSTRUCTION
Experienced extension builder ready to quote for your work. TIPS CONSTRUCTION is the best extension builder in N21. No obligation free quotes and m...
£43/hr
£270/day
NexLevel Contractors Ltd
Nexlevel - An aspiring construction and refurbishment company situated in the London. As a family-run business that is meshed with love, we believe...
£48/hr
£301/day
PonariBuilders Ltd
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
£49/hr
£304/day
AL Plumbing & Electrical
Experienced extension builder ready to quote for your work. AL Plumbing & Electrical is the best extension builder in N21. No obligation free quote...
£46/hr
£293/day
Bzone Builders
Need an Extension Builder in N21? Bzone Builders has been helping local clients (10 mile radius) with their extension buildering jobs for many year...
£36/hr
£265/day
Acacia Gardens Ltd
Acacia Gardens Ltd are here to help customers who need an Extension Builder in N21. We offer a competitive rate to complete all your extension buil...
£48/hr
£299/day
Cityscape Projects Ltd
Cityscape Projects Ltd is an established and experienced local extension builder in N21. Please contact us for a free, no obligation quote and comp...
£41/hr
£255/day
C. Jenkin Builders Limited
, N21
C. Jenkin Builders Limited is an established extension buildering business in N21. We come highly recommended and provide competitive quotes for yo...
£50/hr
£313/day
CESV Ltd
Our building services company CESV Ltd was established in 2020, but have been helping customers in North London and the surrounding areas for over ...
£40/hr
£250/day
Noel’s Design
Noel’s Design was established in 1997 by Aaron Noel, its roots is in the Caribbean (Grenada and the British Virgin islands), branched off to Lon...
£41/hr
£259/day
Des Contract Ltd
Relax... you have found a reliable extension builder in N21. Des Contract Ltd is a friendly and reliable company based in N21 who consider no job a...
£41/hr
£253/day
Grand Lion Group
Grand Lion Group is a construction company based in London, offering a wide range of build and refurbishment services. For the last 12 years, our c...
£41/hr
£255/day
Artifex Building & Carpentry Limited
I have been in the construction industry since 2004, originally training as a carpenter. In 2013 I branched out with my own building firm, Artifex,...
Quickly find an Extension Builder in N21
Use these steps to find Extension Builders in N21 for FREE!
- Post your job: Click "Get quotes" and briefly describe your job.
- Enter your details: We’ll match you with Extension Builders in N21. 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 N21 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 - £26,160
Garden office - £10,160
Granny annexe - £87,160
Build a flat roof extension - £22,160
Convert a Garage - £16,160
Hip to gable loft conversion - £42,160
Convert a bungalow loft - £29,160
Build a dormer loft conversion - £42,160
Build a swimming pool - £81,160
Build a Mansard loft conversion - £52,160
Concrete foundations - £6,410
Underpin a building - £17,660
Two storey extension - £88,240
Convert a basement - £39,300
Side return extension - £43,300
Loft conversion - £35,250
Garage - £18,660
Single storey extension - £58,200
Outbuilding - £10,160
Install an RSJ - £2,360
Build a kitchen extension - £42,160
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