From £88,468
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in CM4. Please contact us for a free, no obligat...
From £88,276
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in CM4. No obligation free quotes and m...
From £88,924
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in CM4 and the surrounding area. Contact us to today to get a comp...
From £87,820
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 £90,376
Propello is an established and experienced local extension builder in CM4. Please contact us for a free, no obligation quote and competitive rates...
From £88,636
Nouvell Decor is a trusted extension builder serving customers in CM4 and the surrounding area. Contact us to today to get a competitive quote for ...
From £88,468
skilled worker who specializes in completing a wide range of building and renovation projects
From £88,360
M&J Brickwork Ltd are a Chelmsford based Bricklaying & General Building company that operate throughout the Essex and South London...
From £88,300
Relax... you have found a reliable extension builder in CM4. Derryard Construction Ltd is a friendly and reliable company based in CM4 who consider...
From £87,952
B J CULLEN BUILDERS are here to help customers who need an Extension Builder in CM4. We offer a competitive rate to complete all your extension bui...

Costs range from £87,820 (Can design and Construction based in Ig11) to £90,376 (Propello based in E17), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
Post your job on HaMuch and we'll send it to extension builders to CM4.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Two Storey Extension near Billericay | £38 | £248 |
| Two Storey Extension near Brentwood | £39 | £255 |
| Two Storey Extension near Chelmsford | £38 | £258 |
| Two Storey Extension near Wickford | £39 | £255 |
| Two Storey Extension near Basildon | £39 | £251 |
| Two Storey Extension near Stanford-le-Hope | £40 | £254 |
| Two Storey Extension near Romford | £45 | £274 |
| Two Storey Extension near Rayleigh | £39 | £252 |
| Two Storey Extension near Thundersley | £38 | £251 |
| Two Storey Extension near South Ockendon | £58 | £276 |
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 - £17,872

Two storey extension - £88,558

Build a timber frame extension - £26,372

Build a swimming pool - £81,372

Single storey extension - £62,440

Side return extension - £45,685

Install an RSJ - £2,572

Outbuilding - £10,372

Build a Mansard loft conversion - £52,372

Loft conversion - £37,238

Build a kitchen extension - £42,372

Hip to gable loft conversion - £42,372

Granny annexe - £87,372

Garden office - £10,372

Convert a Garage - £16,372

Garage - £18,872

Build a flat roof extension - £22,372

Build a dormer loft conversion - £42,372

Concrete foundations - £6,622

Convert a bungalow loft - £29,372

Convert a basement - £41,685