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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 £2,080
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...
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 £2,376
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...
ESK Builders
Need to find an Extension Builder near you for all your extension buildering work?
ESK Builders provides a local, trusted extension builder...
RSJ cost in Seven Kings
How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Seven Kings it ranges from £1,616 (RTC Plumbers based in RM6) to £2,912 (Render based in IG1).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in Seven Kings by posting a job with HaMuch and we will 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 - £17,680
Two storey extension - £88,270
Build a timber frame extension - £26,180
Build a swimming pool - £81,180
Single storey extension - £58,600
Side return extension - £43,525
Install an RSJ - £2,380
Outbuilding - £10,180
Build a Mansard loft conversion - £52,180
Loft conversion - £35,438
Build a kitchen extension - £42,180
Hip to gable loft conversion - £42,180
Granny annexe - £87,180
Garden office - £10,180
Convert a Garage - £16,180
Garage - £18,680
Build a flat roof extension - £22,180
Build a dormer loft conversion - £42,180
Concrete foundations - £6,430
Convert a bungalow loft - £29,180
Convert a basement - £39,525