From £9,880
Experienced extension builder ready to quote for your work. CIA Construction Limited is the best extension builder in CM15. No obligation free quot...
From £10,064
Hyde Building Ltd are here to help customers who need an Extension Builder in CM15. We offer a competitive rate to complete all your extension buil...
From £10,360
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 £10,192
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 £10,024
Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...
From £10,008
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
From £10,312
Local Boiler Plumbing & Heating Services is an established and experienced local extension builder in CM15. Please contact us for a free, no obliga...
From £10,184
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 £10,184
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 £10,616
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...

Garden offices range from the cheapest of £9,880 (CIA Construction Limited based in RM18) to the dearest of £10,616 (HOUSE BUILDING SERVICES LIMITED based in DA16), but these are only estimates.
The best way to compare costs is to get actual quotes.
Get rates and quotes to build a garden office in CM15 by posting a job with HaMuch. We'll send it to extension builders in CM15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Garden Office near Brentwood | £39 | £255 |
| Garden Office near Billericay | £38 | £248 |
| Garden Office near Romford | £45 | £274 |
| Garden Office near Basildon | £39 | £251 |
| Garden Office near South Ockendon | £58 | £276 |
| Garden Office near Chelmsford | £38 | £258 |
| Garden Office near Wickford | £39 | £255 |
| Garden Office near Stanford-le-Hope | £40 | £254 |
| Garden Office near Loughton | £44 | £273 |
| Garden Office 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 - £17,682

Two storey extension - £88,274

Build a timber frame extension - £26,182

Build a swimming pool - £81,182

Single storey extension - £58,648

Side return extension - £43,552

Install an RSJ - £2,382

Outbuilding - £10,182

Build a Mansard loft conversion - £52,182

Loft conversion - £35,460

Build a kitchen extension - £42,182

Hip to gable loft conversion - £42,182

Granny annexe - £87,182

Garden office - £10,182

Convert a Garage - £16,182

Garage - £18,682

Build a flat roof extension - £22,182

Build a dormer loft conversion - £42,182

Concrete foundations - £6,432

Convert a bungalow loft - £29,182

Convert a basement - £39,552