From £62,200
Need an Extension Builder in CM15? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension buildering j...
1 review
From £58,840
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
From £55,480
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £55,160
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
From £61,240
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in CM15. Please contact us for a free, no obliga...
From £58,680
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in CM15. No obligation free quotes and ...
From £58,680
Relax... you have found a reliable extension builder in CM15. First guard Roofing is a friendly and reliable company based in CM15 who consider no ...
From £67,320
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in CM15 and the surrounding area. Contact us to today to get a com...
From £52,600
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 £59,960
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.

"Single storey extension" - CM5, job posted 01/04/24
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Single Storey Extension near Brentwood | £39 | £255 |
| Single Storey Extension near Billericay | £38 | £248 |
| Single Storey Extension near Romford | £45 | £274 |
| Single Storey Extension near Basildon | £39 | £251 |
| Single Storey Extension near South Ockendon | £58 | £276 |
| Single Storey Extension near Chelmsford | £38 | £258 |
| Single Storey Extension near Wickford | £39 | £255 |
| Single Storey Extension near Stanford-le-Hope | £40 | £254 |
| Single Storey Extension near Loughton | £44 | £273 |
| Single Storey Extension near Thurrock | £41 | £260 |
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 - £17,701

Two storey extension - £88,301

Build a timber frame extension - £26,201

Build a swimming pool - £81,201

Single storey extension - £59,016

Side return extension - £43,759

Install an RSJ - £2,401

Outbuilding - £10,201

Build a Mansard loft conversion - £52,201

Loft conversion - £35,633

Build a kitchen extension - £42,201

Hip to gable loft conversion - £42,201

Granny annexe - £87,201

Garden office - £10,201

Convert a Garage - £16,201

Garage - £18,701

Build a flat roof extension - £22,201

Build a dormer loft conversion - £42,201

Concrete foundations - £6,451

Convert a bungalow loft - £29,201

Convert a basement - £39,759