Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.71 (12 reviews)

Find affordable CO3 extension builders

Prices range from cheapest £22/hour and £167/day (Ace Locksmith) to £38/hour and £261/day (R Best Building Services) - average £31/hr and £222/day

HaMuch is Excellent

Local CO3 extension builders & recently posted jobs

"Basic 3 metre by 4 metre single extension to back of house" - COLCHESTER, job posted 01/09/25

"Single storey extension" - CO4, job posted 14/07/25

"Hip to gable loft conversion" - COLCHESTER, job posted 07/07/25

"Loft conversion" - COLCHESTER, job posted 16/03/25

"Loft conversion" - COLCHESTER, job posted 26/02/25

"Loft conversion without any extension to the roof, windows to the roof, space for bedroom with open plan walk in shower and toilet" - COLCHESTER, job posted 08/02/25

"Single storey extension" - COLCHESTER, job posted 22/10/24

"Loft conversion" - COLCHESTER, job posted 29/04/24

"Loft conversion" - COLCHESTER, job posted 01/04/24

"Loft conversion" - COLCHESTER, job posted 01/02/24

"Loft convertion in semi detach house use for bed room and bath" - COLCHESTER, job posted 21/01/24

"Remove of kitchen/diner back wall, install steel and fit large sliding doors. Also removal of existing kitchen /diner ceiling and fit new plasterboard for ceiling" - CO6, job posted 19/01/24

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 CO3 extension builders rates

Compare CO3 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Colchester	£33	£230
Extension Builders near Tendring	£31	£226
Extension Builders near Witham	£36	£240
Extension Builders near Maldon	£36	£244
Extension Builders near Sudbury	£34	£229
Extension Builders near Braintree	£37	£247
Extension Builders near Clacton-on-Sea	£31	£232
Extension Builders near Harwich	£34	£248
Extension Builders near Ipswich	£33	£235
Extension Builders near Chelmsford	£38	£258

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 - £25,776

Garden office - £9,776

Granny annexe - £86,776

Build a flat roof extension - £21,776

Convert a Garage - £15,776

Hip to gable loft conversion - £41,776

Convert a bungalow loft - £28,776

Build a dormer loft conversion - £41,776

Build a swimming pool - £80,776

Build a Mansard loft conversion - £51,776

Concrete foundations - £6,026

Underpin a building - £17,276

Two storey extension - £87,664

Convert a basement - £34,980

Side return extension - £38,980

Loft conversion - £31,650

Garage - £18,276

Single storey extension - £50,520

Outbuilding - £9,776

Install an RSJ - £1,976

Build a kitchen extension - £41,776

More extensions & conversions cost guides...

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