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

Need help with a job?

Find affordable OX3 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

HaMuch is Excellent

Local OX3 extension builders

"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 OX3 extension builders rates

Compare OX3 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Oxford	£37	£265
Extension Builders near Abingdon-on-Thames	£35	£258
Extension Builders near Cherwell	£35	£249
Extension Builders near South Oxfordshire	£36	£253
Extension Builders near Bicester	£35	£249
Extension Builders near Didcot	£36	£266
Extension Builders near Witney	£32	£244
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 - £26,000

Garden office - £10,000

Granny annexe - £87,000

Build a flat roof extension - £22,000

Convert a Garage - £16,000

Hip to gable loft conversion - £42,000

Convert a bungalow loft - £29,000

Build a dormer loft conversion - £42,000

Build a swimming pool - £81,000

Build a Mansard loft conversion - £52,000

Concrete foundations - £6,250

Underpin a building - £17,500

Two storey extension - £88,000

Convert a basement - £37,500

Side return extension - £41,500

Loft conversion - £33,750

Garage - £18,500

Single storey extension - £55,000

Outbuilding - £10,000

Install an RSJ - £2,200

Build a kitchen extension - £42,000

More extensions & conversions cost guides...

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