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Rafix Building
Rafal Szczepanski
Cockfosters, EN4
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...
"Underpinning" - N20, job posted 01/03/26
New Finishes
New Finishes is a trusted extension builder serving customers in EN4 and the surrounding area. Contact us to today to get a competitive quote for e...
"Underpinning" - EN2, job posted 19/12/25
Pavillion Building Services
Cockfosters, EN4
Relax... you have found a reliable extension builder in EN4. Pavillion Building Services is a friendly and reliable company based in EN4 who consid...
"Loft conversion" - N20, job posted 11/01/24
Homeland Building Ltd
Homeland Building Ltd is a trusted extension builder serving customers in EN4 and the surrounding area. Contact us to today to get a competitive qu...
Wittick Building Ltd
Cockfosters, EN4
Wittick Building Ltd is a trusted extension builder serving customers in EN4 and the surrounding area. Contact us to today to get a competitive quo...
Roni Lofts Conversions Ltd
Need an Extension Builder in EN4? Roni Lofts Conversions Ltd has been helping local clients (10 mile radius) with their extension buildering jobs f...
Odp Builders
Need an Extension Builder in EN4? Odp Builders has been helping local clients (5 mile radius) with their extension buildering jobs for many years. ...
Homeworks Design & Build Ltd
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
D.J Coyle & Co.Ltd
Trusted and professional extension builder in EN4. Experienced in all extension buildering work and keeping within budget and on quote. D.J Coyle &...
A Sparky Technical Building Services
Relax... you have found a reliable extension builder in EN4. A Sparky Technical Building Services is a friendly and reliable company based in EN4 w...
Home Projects
Barnet, EN4
Relax... you have found a reliable extension builder in EN4. Home Projects is a friendly and reliable company based in EN4 who consider no job as t...
The Hadley Loft Company Ltd
Are you looking to make the most of your property with a loft conversion? The Hadley Loft Company Ltd can help. Based in Barnet, we provide high-en...
Mansarda Ltd
Need to find an Extension Builder near you for all your extension buildering work?
Mansarda Ltd provides a local, trusted extension builder...
R & I Builders
Cockfosters, EN4
R & I Builders is an established extension buildering business in EN4. We come highly recommended and provide competitive quotes for your work.
...I Builder
I Builder are a well established, reliable and trustworthy company with over twenty years' experience.We are based in Barnet covering Barne...
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...
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...
£40/hr
£248/day
TIPS CONSTRUCTION
Experienced extension builder ready to quote for your work. TIPS CONSTRUCTION is the best extension builder in EN4. No obligation free quotes and m...
£49/hr
£309/day
BT Projects London Ltd
At BT Projects London Ltd we have been fitting bespoke bathrooms for 14 years. We pride ourselves on being the go-to bathroom fitt...
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- Enter your details: We’ll match you with Extension Builders in EN4. 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 EN4 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 - £26,240
Garden office - £10,240
Granny annexe - £87,240
Build a flat roof extension - £22,240
Convert a Garage - £16,240
Hip to gable loft conversion - £42,240
Convert a bungalow loft - £29,240
Build a dormer loft conversion - £42,240
Build a swimming pool - £81,240
Build a Mansard loft conversion - £52,240
Concrete foundations - £6,490
Underpin a building - £17,740
Two storey extension - £88,360
Convert a basement - £40,200
Side return extension - £44,200
Loft conversion - £36,000
Garage - £18,740
Single storey extension - £59,800
Outbuilding - £10,240
Install an RSJ - £2,440
Build a kitchen extension - £42,240
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