Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.5 (1 reviews)

Find affordable Witney extension builders

Prices range from cheapest £30/hour and £214/day (Reece Berry Building Contractor) to £40/hour and £303/day (Millrick Construction) - average £35/hr and £257/day

HaMuch is Excellent

Local Witney extension builders & latest jobs

"Granny annexe" - CARTERTON, job posted 30/05/26

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 Witney extension builders rates

Compare Witney extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Witney	£32	£244
Extension Builders near Oxford	£37	£263
Extension Builders near Vale of White Horse	£36	£271
Extension Builders near Abingdon-on-Thames	£35	£258
Extension Builders near Cherwell	£35	£249
Extension Builders near Bicester	£35	£249
Extension Builders near Didcot	£36	£266
Extension Builders near Stratton St Margaret	£37	£238
Extension Builders near Thamesdown	£38	£239
Extension Builders near South Oxfordshire	£36	£253

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 - £26,056

Garden office - £10,056

Granny annexe - £87,056

Build a flat roof extension - £22,056

Convert a Garage - £16,056

Hip to gable loft conversion - £42,056

Convert a bungalow loft - £29,056

Build a dormer loft conversion - £42,056

Build a swimming pool - £81,056

Build a Mansard loft conversion - £52,056

Concrete foundations - £6,306

Underpin a building - £17,556

Two storey extension - £88,084

Convert a basement - £38,130

Side return extension - £42,130

Loft conversion - £34,275

Garage - £18,556

Single storey extension - £56,120

Outbuilding - £10,056

Install an RSJ - £2,256

Build a kitchen extension - £42,056

More extensions & conversions cost guides...

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