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AV Home Improvements
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
"Garage conversion" - PINNER, job posted 24/03/25
Sharp Building Ltd
Sharp Building Ltd is an established and experienced local extension builder in Northwood. Please contact us for a free, no obligation quote and co...
"Loft conversion - (2 Rooms and a shower) Total Area - 40 square metres)" - WD19, job posted 29/12/24
C S C BUILDINGS LTD
Relax... you have found a reliable extension builder in Northwood. C S C BUILDINGS LTD is a friendly and reliable company based in Northwood who co...
Project Squared Construction Ltd
Northwood Hertfordshire, HA6
We specialise in constructing and the refurbishment of homes for discerning clients looking for quality, excellence and design in London and the Ho...
J B S Development & Construction Ltd
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Adams Build and Design LTD.
Northwood Greater London, HA6
Need to find an Extension Builder near you for all your extension buildering work?
Adams Build and Design LTD. provides a local, trusted ex...
Coste + Beno Ltd
Coste + Beno is an experienced construction business with a strong residential background. We pride ourselves on balancing architectural ingenuity ...
£40/hr
£253/day
RMB Building and Development Ltd
Experienced extension builder ready to quote for your work. RMB Building and Development Ltd is the best extension builder in Northwood. No obligat...
£48/hr
£303/day
S2M VENTURES LLP
Trusted and professional extension builder in Northwood. Experienced in all extension buildering work and keeping within budget and on quote. S2M V...
£38/hr
£243/day
Excelsior Construction Ltd
Excelsior Construction Ltd is an established and experienced local extension builder in Northwood. Please contact us for a free, no obligation quot...
£44/hr
£278/day
Daniel London
Daniel London is a trusted extension builder serving customers in Northwood and the surrounding area. Contact us to today to get a competitive quot...
£41/hr
£256/day
Coste + Beno Ltd
Greater London, HA6
Relax... you have found a reliable extension builder in Northwood. Coste + Beno Ltd is a friendly and reliable company based in Northwood who consi...
£46/hr
£288/day
Ideal Place Construction Ltd
Trusted and professional extension builder in Northwood. Experienced in all extension buildering work and keeping within budget and on quote. Ideal...
£47/hr
£297/day
GRAPHENE
Need to find an Extension Builder near you for all your extension buildering work?
GRAPHENE provides a local, trusted extension buildering ...
£40/hr
£253/day
Cannon Build Solutions
Cannon Build Solutions is an established extension buildering business in Northwood. We come highly recommended and provide competitive quotes for ...
Quickly find an Extension Builder in Northwood
Use these steps to find Extension Builders in Northwood for FREE!
- Post your job: Click "Get quotes" and briefly describe your job.
- Enter your details: We’ll match you with Extension Builders in Northwood. 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 Northwood 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 - £26,232

Garden office - £10,232

Granny annexe - £87,232

Build a flat roof extension - £22,232

Convert a Garage - £16,232

Hip to gable loft conversion - £42,232

Convert a bungalow loft - £29,232

Build a dormer loft conversion - £42,232

Build a swimming pool - £81,232

Build a Mansard loft conversion - £52,232

Concrete foundations - £6,482

Underpin a building - £17,732

Two storey extension - £88,348

Convert a basement - £40,110

Side return extension - £44,110

Loft conversion - £35,925

Garage - £18,732

Single storey extension - £59,640

Outbuilding - £10,232

Install an RSJ - £2,432

Build a kitchen extension - £42,232
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