From £18,532
Relax... you have found a reliable extension builder in E20. Major Building Contractors Ltd is a friendly and reliable company based in E20 who con...
From £17,772
LOCAL COMPANY WITH A TAILORED SERVICE TO ALL BUILDING WORKSYour A2Z building needsLOFT SPACE from £12,000LOFT DORMER from &...
From £19,212
Experienced extension builder ready to quote for your work. Render is the best extension builder in E20. No obligation free quotes and many happy c...
From £18,812
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in E20. Please contact us for a free, no obligat...
From £18,468
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in E20. We offer a competitive rate to complete all your extension bui...
From £18,484
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £18,492
Sky Property Group is a trusted extension builder serving customers in E20 and the surrounding area. Contact us to today to get a competitive quote...
From £18,380
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...
From £18,684
Need to find an Extension Builder near you for all your extension buildering work?
Sz Builders provides a local, trusted extension builderi...
From £18,924
A firm that believes in quality, doesn't cut on the key values that creates a ideal home or business. We take on all jobs working to your budget

Builders charge between £17,772 (RLUK & Co.Ltd based in IG3) and £19,212 (Render based in IG1) in E20 to build a garage, but these costs are only estimates.
Comparing extension builders estimates for building a garage gives you an idea of who will be better value, but the best way to compare costs is to get actual quotes.
Get real quotes to build a new garage in E20 by posting a job with HaMuch and we will send it to extension builders in E20.
| Borough in London |
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| Garage in Olympic Park |
| Garage in Barking |
| Garage in Seven Kings |
| Garage in Ilford |
| Garage in Manor Park |
| Garage in Becontree Heath |
| Garage in Becontree |
| Garage in Gants Hill |
| Garage in East Ham |
| Garage in Redbridge |
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 - £17,576

Two storey extension - £88,114

Build a timber frame extension - £26,076

Build a swimming pool - £81,076

Single storey extension - £56,520

Side return extension - £42,355

Install an RSJ - £2,276

Outbuilding - £10,076

Build a Mansard loft conversion - £52,076

Loft conversion - £34,463

Build a kitchen extension - £42,076

Hip to gable loft conversion - £42,076

Granny annexe - £87,076

Garden office - £10,076

Convert a Garage - £16,076

Garage - £18,576

Build a flat roof extension - £22,076

Build a dormer loft conversion - £42,076

Concrete foundations - £6,326

Convert a bungalow loft - £29,076

Convert a basement - £38,355