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SDS Constructions
Sean Smithers
Our building services company SDS Constructions has been established for many years and have been providing customers in Dagenham and the surroundi...
From £21,880
Can design and Construction
Erald Kanani
Member since August 2025
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Gems Building & Maintenance Services
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
PHOENIX DEVELOPMNTS LONDON LTD
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Render
Experienced extension builder ready to quote for your work. Render is the best extension builder in Seven Kings. No obligation free quotes and many...
Tony Rutter
Need an Extension Builder in Seven Kings? Tony Rutter has been helping local clients (10 mile radius) with their extension buildering jobs for many...
Decorating Building Service
Decorating Building Service are here to help customers who need an Extension Builder in Seven Kings. We offer a competitive rate to complete all yo...
Kunshi Services UK Ltd
Kunshi Services UK Ltd is a trusted extension builder serving customers in Seven Kings and the surrounding area. Contact us to today to get a compe...
From £22,176
Fedora and sons Ltd
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in Seven Kings and the surrounding area. Contact us to today to get a competit...
RTC Plumbers
Shaik Jamal
Welcome to RTC Plumbers! With over 15 years of experience, we offer a range of plumbing services from simple repairs to complex installations, each...
Flat roof extension cost in Seven Kings
A flat roof extension ranges from the cheapest of £21,416 (RTC Plumbers based in RM6) to the dearest of £22,712 (Render based in IG1), but these are just estimates. While they give you an idea of who will be better value, the best way to compare costs is to get real quotes.
Find out how much your flat roof extension will cost in Seven Kings by posting a job with HaMuch. We'll send it to extension builders in Seven Kings.
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Estimates for common extension builder jobs in Seven Kings;
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 - £17,677
Two storey extension - £88,265
Build a timber frame extension - £26,177
Build a swimming pool - £81,177
Single storey extension - £58,536
Side return extension - £43,489
Install an RSJ - £2,377
Outbuilding - £10,177
Build a Mansard loft conversion - £52,177
Loft conversion - £35,408
Build a kitchen extension - £42,177
Hip to gable loft conversion - £42,177
Granny annexe - £87,177
Garden office - £10,177
Convert a Garage - £16,177
Garage - £18,677
Build a flat roof extension - £22,177
Build a dormer loft conversion - £42,177
Concrete foundations - £6,427
Convert a bungalow loft - £29,177
Convert a basement - £39,489