Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.83 (3 reviews)

Find affordable Oxford extension builders

Prices range from cheapest £4/hour and £2/day (Beaumont Design & Build Ltd) to £45/hour and £314/day (Michael E Phillips) - average £35/hr and £252/day

HaMuch is Excellent

Local Oxford extension builders & latest jobs

"Build a two storey extension" - OX3, job posted 01/05/26

"Two storey extension" - OXFORD, job posted 16/09/25

"Single storey extension" - OXFORD, job posted 17/05/25

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 Oxford extension builders rates

Compare Oxford extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Oxford	£37	£261
Extension Builders near Abingdon-on-Thames	£35	£258
Extension Builders near Cherwell	£35	£249
Extension Builders near Witney	£32	£244
Extension Builders near Didcot	£36	£266
Extension Builders near South Oxfordshire	£36	£253
Extension Builders near Bicester	£35	£249
Extension Builders near Vale of White Horse	£36	£271
Extension Builders near Aylesbury Vale	£36	£246
Extension Builders near Aylesbury	£42	£270

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 - £26,040

Garden office - £10,040

Granny annexe - £87,040

Build a flat roof extension - £22,040

Convert a Garage - £16,040

Hip to gable loft conversion - £42,040

Convert a bungalow loft - £29,040

Build a dormer loft conversion - £42,040

Build a swimming pool - £81,040

Build a Mansard loft conversion - £52,040

Concrete foundations - £6,290

Underpin a building - £17,540

Two storey extension - £88,060

Convert a basement - £37,950

Side return extension - £41,950

Loft conversion - £34,125

Garage - £18,540

Single storey extension - £55,800

Outbuilding - £10,040

Install an RSJ - £2,240

Build a kitchen extension - £42,040

More extensions & conversions cost guides...

People in Oxford searching for a Extension Builder also viewed...

Painter and Decorator

The Largest Database of UK Trade Rates

At HaMuch we know what tradespeople charge because we have the largest database of rates anywhere in the UK. If you want quotes for jobs at the right price for you, post your jobs with HaMuch and get your home improvements kickstarted straight away!

Appliance Repair Specialist

Conservatory Specialist