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SH Enterprise
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
"Underpin a building" - N7, job posted 23/08/26
Torrington
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
CK Constructions & Development Ltd
CK Constructions & Development Ltd is a trusted extension builder serving customers in Clerkenwell and the surrounding area. Contact us to today to...
"Concrete foundation" - W1T, job posted 16/10/25
JK Doors
JK Doors is a trusted extension builder serving customers in Clerkenwell and the surrounding area. Contact us to today to get a competitive quote f...
GS Fabric Ltd
GS Fabric Ltd is an established and experienced local extension builder in Clerkenwell. Please contact us for a free, no obligation quote and compe...
JM Building Services
JM Building Services is a trusted extension builder serving customers in Clerkenwell and the surrounding area. Contact us to today to get a competi...
Buildwiser
Buildwiser is a trusted extension builder serving customers in Clerkenwell and the surrounding area. Contact us to today to get a competitive quote...
Brooks Builders & Decorators
Brooks Builders & Decorators is an established extension buildering business in Clerkenwell. We come highly recommended and provide competitive quo...
Q Lofts and Extensions
Anthony Sullivan
We build Lofts. We build Extensions. We undertake conversions. Our Terms and conditions apply as shown in our starter packs.
£42/hr
£269/day
plansing
Plansing Ltd
Experience the best architectural design services with PLANSING, where we flawlessly integrate innovative architectural designer products to bring ...
£41/hr
£255/day
TOP CONSTRUCTION
TOP CONSTRUCTION is an established extension buildering business in Clerkenwell. We come highly recommended and provide competitive quotes for your...
£40/hr
£252/day
CAPITAL CONSTRUCTION LIMITED
Trusted and professional extension builder in Clerkenwell. Experienced in all extension buildering work and keeping within budget and on quote. CAP...
£48/hr
£303/day
Masters Construction UK
Joel Cayless white
20 years experience in high end carpentry, joinery and furniture making
£48/hr
£299/day
Londoner Building Ltd.
We have the experience and knowledge to carry out any project, big or small. Our team of experts thoroughly plan the budget and manage your projec...
£46/hr
£284/day
Aylaa Exclusive
Need an Extension Builder in Clerkenwell? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs for m...
£46/hr
£284/day
Kovacs Construction Ltd
At Kovacs Construction, you can rely on our talented builders and engineers to deliver unrivalled building services solutions. Let us show you our ...
£38/hr
£240/day
Kovacs Construction Ltd
Experienced extension builder ready to quote for your work. Kovacs Construction Ltd is the best extension builder in Clerkenwell. No obligation fre...
£42/hr
£263/day
SCANDIIN
SCANDIIN is an established and experienced local extension builder in Clerkenwell. Please contact us for a free, no obligation quote and competitiv...
£44/hr
£275/day
Andrew Penny Construction
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
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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 - £26,224
Garden office - £10,224
Granny annexe - £87,224
Build a flat roof extension - £22,224
Convert a Garage - £16,224
Hip to gable loft conversion - £42,224
Convert a bungalow loft - £29,224
Build a dormer loft conversion - £42,224
Build a swimming pool - £81,224
Build a Mansard loft conversion - £52,224
Concrete foundations - £6,474
Underpin a building - £17,724
Two storey extension - £88,336
Convert a basement - £40,020
Side return extension - £44,020
Loft conversion - £35,850
Garage - £18,724
Single storey extension - £59,480
Outbuilding - £10,224
Install an RSJ - £2,424
Build a kitchen extension - £42,224
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