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SJ Expert Building Services
SJ Expert Building Services are here to help customers who need an Extension Builder in Archway. We offer a competitive rate to complete all your e...
"Underpin a building" - N7, job posted 23/08/26
SLS BUILDERS LIMITED
SLS BUILDERS LIMITED is a trusted extension builder serving customers in Archway and the surrounding area. Contact us to today to get a competitive...
"Need an extension builder" - N4, job posted 18/05/25
First guard Roofing
Darren Bergin
Relax... you have found a reliable extension builder in Archway. First guard Roofing is a friendly and reliable company based in Archway who consid...
"RSJ re-installation" - N16, job posted 10/04/25
Andreas Thomas Demetri
Andreas Thomas Demetri is a trusted extension builder serving customers in Archway and the surrounding area. Contact us to today to get a competiti...
"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
DLER SINGH D S BUILDERS
DLER SINGH D S BUILDERS are here to help customers who need an Extension Builder in Archway. We offer a competitive rate to complete all your exten...
"Basement conversion" - N6, job posted 16/10/23
£46/hr
£293/day
BM Lofts Limited
Need an Extension Builder in Archway? BM Lofts Limited has been helping local clients (5 mile radius) with their extension buildering jobs for many...
£45/hr
£282/day
M Collins Builders Ltd
Michael Collins Builders are experts in domestic conversions and extensions - drawing on over 25 years experience in the trade. We have built up a ...
£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...
£43/hr
£267/day
Brothers Group
Our building services company Brothers Group have been helping customers in North, East and West London and the surrounding area by providing profe...
£47/hr
£292/day
Mel Massey Studio
Mel Massey Studio, based in Finsbury Park, North London, offers interior design, interior styling and project management. With over 10 years of exp...
£40/hr
£250/day
Bok Services Ltd
Need an Extension Builder in Archway? Bok Services Ltd has been helping local clients (5 mile radius) with their extension buildering jobs for many...
£40/hr
£252/day
CAPITAL CONSTRUCTION LIMITED
Trusted and professional extension builder in Archway. Experienced in all extension buildering work and keeping within budget and on quote. CAPITAL...
£50/hr
£311/day
Novo Solutions Group Ltd
Welcome to Novo Solutions Group Ltd - Your premier building construction and renovation specialists. Based in the UK, Novo Solutions Group...
£46/hr
£287/day
WeTradeWorks
We pride ourselves on our ability to provide unmatched construction, renovation and refurbishment services to homeowners, designers and architects ...
£47/hr
£292/day
Raocon Limited
Archway Greater London, N19
We make the adage ‘House is where the heart is’, a reality for the house-owners.We are an empathetic housebuilder that delivers elegance and du...
£38/hr
£236/day
Warren House Construction Ltd
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
£41/hr
£256/day
Avocado Sweets Design Studio
Greater London, N19
Need an Extension Builder in Archway? Avocado Sweets Design Studio has been helping local clients (5 mile radius) with their extension buildering j...
£48/hr
£303/day
ARCHWAY DESIGN+BUILD LTD
ARCHWAY DESIGN+BUILD LTD are here to help customers who need an Extension Builder in Archway. We offer a competitive rate to complete all your exte...
£43/hr
£266/day
RAM Build Construction Ltd
RAM Build Construction Ltd is an established and experienced local extension builder in Archway. Please contact us for a free, no obligation quote ...
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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 Archway. 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 Archway 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 - £26,184

Garden office - £10,184

Granny annexe - £87,184

Build a flat roof extension - £22,184

Convert a Garage - £16,184

Hip to gable loft conversion - £42,184

Convert a bungalow loft - £29,184

Build a dormer loft conversion - £42,184

Build a swimming pool - £81,184

Build a Mansard loft conversion - £52,184

Concrete foundations - £6,434

Underpin a building - £17,684

Two storey extension - £88,276

Convert a basement - £39,570

Side return extension - £43,570

Loft conversion - £35,475

Garage - £18,684

Single storey extension - £58,680

Outbuilding - £10,184

Install an RSJ - £2,384

Build a kitchen extension - £42,184
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