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Select your affordable Olympic Park extension builder
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 £17,380
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...
Experienced extension builder ready to quote for your work. Render is the best extension builder in Olympic Park. No obligation free quotes and man...
Decorating Building Service are here to help customers who need an Extension Builder in Olympic Park. We offer a competitive rate to complete all y...
Relax... you have found a reliable extension builder in Olympic Park. Sevcan Construction is a friendly and reliable company based in Olympic Park ...
Kunshi Services UK Ltd is a trusted extension builder serving customers in Olympic Park and the surrounding area. Contact us to today to get a comp...
From £17,676
MIHAI Martolea
Member since September 2026
Fedora and sons Ltd is a trusted extension builder serving customers in Olympic Park and the surrounding area. Contact us to today to get a competi...
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...
Need to find an Extension Builder near you for all your extension buildering work?
ESK Builders provides a local, trusted extension builder...
Need an Extension Builder in Olympic Park? MD Building & Project Management Ltd has been helping local clients (10 mile radius) with their extensio...

Underpinning ranges from £16,916 (RTC Plumbers based in RM6) to £18,212 (Render based in IG1), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in Olympic Park by posting a job with HaMuch and we will send it to extension builders in Olympic Park.
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 - £17,673

Two storey extension - £88,259

Build a timber frame extension - £26,173

Build a swimming pool - £81,173

Single storey extension - £58,456

Side return extension - £43,444

Install an RSJ - £2,373

Outbuilding - £10,173

Build a Mansard loft conversion - £52,173

Loft conversion - £35,370

Build a kitchen extension - £42,173

Hip to gable loft conversion - £42,173

Granny annexe - £87,173

Garden office - £10,173

Convert a Garage - £16,173

Garage - £18,673

Build a flat roof extension - £22,173

Build a dormer loft conversion - £42,173

Concrete foundations - £6,423

Convert a bungalow loft - £29,173

Convert a basement - £39,444