From £6,658
London, N1
Our building services company Upper Class Builders based in London and the surrounding area, providing professional, trustworthy building services....
From £6,154
Regent Developments is an established and experienced local extension builder in N1. Please contact us for a free, no obligation quote and competit...
From £6,458
London, N1
Need to find an Extension Builder near you for all your extension buildering work?
Build Place Ltd provides a local, trusted extension buil...
From £6,330
At PRG Extensions we a collective of skilled professionals who have the client in the forefront of their minds when we 'plan' 'design' & 'build' ou...
From £6,562
Surrey, N1
Ant-works is an established extension buildering business in N1. We come highly recommended and provide competitive quotes for your work.
From £6,650
Need an Extension Builder in N1? Juxtacon Ltd has been helping local clients (5 mile radius) with their extension buildering jobs for many years. G...
From £6,114
Greater London, N1
Trusted and professional extension builder in N1. Experienced in all extension buildering work and keeping within budget and on quote. PRG Extensio...
From £6,466
Experienced extension builder ready to quote for your work. Sandhill Bulding Solutions Ltd is the best extension builder in N1. No obligation free ...
From £6,738
Greater London, N1
Carta Nova is a studio for architecture and interior design based in London.We believe that good design makes your life easier, and it is fun — w...
From £6,666
CMT Ltd is an established extension buildering business in N1. We come highly recommended and provide competitive quotes for your work.

Concrete foundations range from the £6,114 (PRG Extensions based in N1) to £6,738 (CARTA NOVA - Architecture & Beyond based in N1) in N1.
Comparing extension builders estimates for laying concrete foundations gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Find out the exact cost of laying concrete foundations in N1 by posting a job with HaMuch. We will send it to extension builders who can give you a detailed quote.
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.

Underpin a building - £17,730

Two storey extension - £88,344

Build a timber frame extension - £26,230

Build a swimming pool - £81,230

Single storey extension - £59,592

Side return extension - £44,083

Install an RSJ - £2,430

Outbuilding - £10,230

Build a Mansard loft conversion - £52,230

Loft conversion - £35,903

Build a kitchen extension - £42,230

Hip to gable loft conversion - £42,230

Granny annexe - £87,230

Garden office - £10,230

Convert a Garage - £16,230

Garage - £18,730

Build a flat roof extension - £22,230

Build a dormer loft conversion - £42,230

Concrete foundations - £6,480

Convert a bungalow loft - £29,230

Convert a basement - £40,083