Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 5 (2 reviews)

Find affordable Chelmsford extension builders

Prices range from cheapest £30/hour and £228/day (Nigel Gresty Limited) to £44/hour and £295/day (Billericay Loft Conversions) - average £37/hr and £251/day

HaMuch is Excellent

Local Chelmsford extension builders & latest jobs

"Looking to make a wooden shed at the back side of the house" - CM1, job posted 23/09/25

"Single storey extension" - CM1, job posted 03/09/24

What are the best ways to avoid problems when paying the Extension Builder?

The most important thing is do avoid handing over cash or paying large sums in advance. Be wary of paying cash for a cheaper job, i.e. to avoid VAT, you may be going down a slippery slope of not doing things properly which may eventually mean your job is also not done properly.

Agree when you intend to pay, ideally after you are satisfied with the completed job. If it is a big job agree a schedule of staged payments which is fair to both parties.

To avoid bad tradespeople and to ensure you can find them should they not answer a mobile;

Get proper contact details and check them yourself
Check if the company is verified on the Companies House website
Get phone details, ideally a land line or 0800 number and check it
Get a physical office address

Before the job starts should I agree standards of quality and behaviour?

Get quotes in writing by email or in person if possible. Getting quotes online or by text is ok (make sure you accept the offer by replying). For large projects make a written agreement, schedule of works and snagging plans as part of a working document. Also;

Agree expected quality of workmanship and materials in advance
When will work start and when will project be finished, what happens if project over runs ?
How long is the guarantee on work and materials eg 12 months
Discuss onsite behaviour in advance (no smoking, swearing or using mobile phones for non-work purposes)
Agree that your Extension Builder will remove all debris and rubbish and what level of tidying up you want after job

Compare Chelmsford extension builders rates

Compare Chelmsford extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Chelmsford	£38	£258
Extension Builders near Billericay	£38	£248
Extension Builders near Witham	£36	£240
Extension Builders near Wickford	£39	£255
Extension Builders near Maldon	£36	£244
Extension Builders near Brentwood	£39	£255
Extension Builders near Braintree	£37	£247
Extension Builders near Basildon	£39	£251
Extension Builders near Rayleigh	£39	£252
Extension Builders near Thundersley	£38	£251

Job estimates from extension builders near you

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.

Build a timber frame extension - £26,008

Garden office - £10,008

Granny annexe - £87,008

Build a flat roof extension - £22,008

Convert a Garage - £16,008

Hip to gable loft conversion - £42,008

Convert a bungalow loft - £29,008

Build a dormer loft conversion - £42,008

Build a swimming pool - £81,008

Build a Mansard loft conversion - £52,008

Concrete foundations - £6,258

Underpin a building - £17,508

Two storey extension - £88,012

Convert a basement - £37,590

Side return extension - £41,590

Loft conversion - £33,825

Garage - £18,508

Single storey extension - £55,160

Outbuilding - £10,008

Install an RSJ - £2,208

Build a kitchen extension - £42,008

More extensions & conversions cost guides...

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