Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.69 (18 reviews)

Find affordable South Cambridgeshire extension builders

Prices range from cheapest £34/hour and £242/day (TSN Consultants Ltd) to £53/hour and £420/day (ALLIED BUILDING ASSOCIATES LTD) - average £41/hr and £284/day

HaMuch is Excellent

Local South Cambridgeshire extension builders & latest jobs

"Loft conversion" - CAMBRIDGE, job posted 23/02/26

"Converting one of the bedroom into an on suite. ASAP." - SOUTH CAMBRIDGESHIRE, job posted 28/10/25

"To convert one of the bedroom into on suite ." - SOUTH CAMBRIDGESHIRE, job posted 16/09/25

"To convert one bedroom on to on suite room" - SOUTH CAMBRIDGESHIRE, job posted 29/07/25

"Single storey extension" - SOUTH CAMBRIDGESHIRE, job posted 29/07/25

"Granny annexe" - SOUTH CAMBRIDGESHIRE, job posted 10/06/25

"Loft conversion" - CAMBRIDGE, job posted 22/04/25

"Build an outbuilding" - CAMBRIDGE, job posted 23/02/25

"Add one more dormer in current loft room" - CAMBRIDGE, job posted 13/02/25

"Loft conversion" - CAMBRIDGE, job posted 02/10/24

"Hi I was hoping to get a quote for the renovation of an entire house. It’s about 60 years old. I would need: 1. potential plastering of walls, r 2. removal of an existing kitchen & fitting of new 3. Removal of 1 bathroom & fitting of 2 4. garage conversion 5. flooring & carpet, ..." - CB2, job posted 05/09/24

"Loft conversion" - CAMBRIDGE, job posted 29/08/24

"Loft conversion" - CAMBRIDGE, job posted 17/04/24

"Single storey extension" - SOUTH CAMBRIDGESHIRE, job posted 15/04/24

"Loft conversion" - CAMBRIDGE, job posted 19/02/24

"Loft conversion" - CAMBRIDGE, job posted 21/08/23

"Loft conversion" - CAMBRIDGE, job posted 15/08/23

"Loft conversion is required. Need to know the cost" - CAMBRIDGE, job posted 30/07/23

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 South Cambridgeshire extension builders rates

Compare South Cambridgeshire extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near South Cambridgeshire	£43	£305
Extension Builders near Cambridge	£38	£271
Extension Builders near Biggleswade	£41	£268
Extension Builders near St Neots	£51	£318
Extension Builders near Huntingdon	£38	£284
Extension Builders near Letchworth	£44	£283
Extension Builders near North Hertfordshire	£44	£283
Extension Builders near Haverhill	£37	£260
Extension Builders near East Hertfordshire	£44	£289
Extension Builders near Ely	£40	£279

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 - £26,272

Garden office - £10,272

Granny annexe - £87,272

Build a flat roof extension - £22,272

Convert a Garage - £16,272

Hip to gable loft conversion - £42,272

Convert a bungalow loft - £29,272

Build a dormer loft conversion - £42,272

Build a swimming pool - £81,272

Build a Mansard loft conversion - £52,272

Concrete foundations - £6,522

Underpin a building - £17,772

Two storey extension - £88,408

Convert a basement - £40,560

Side return extension - £44,560

Loft conversion - £36,300

Garage - £18,772

Single storey extension - £60,440

Outbuilding - £10,272

Install an RSJ - £2,472

Build a kitchen extension - £42,272

More extensions & conversions cost guides...

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