Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.72 (16 reviews)

Find affordable RG4 extension builders

Cheapest £26/hour & £234/day (Berkshire Environmental Services Ltd) to £44/hour & £309/day (Ad Swadling Building) - average £38/hour & £268/day

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"8*3 rear extension in house" - RG30, job posted 03/10/26

"Single storey extension" - RG10, job posted 09/09/25

"Single storey extension. Adding second storey to side extension." - RG9, job posted 01/05/25

"Initial quotes to explore feasibility for a side return extension. Victorian mid-terrace." - RG2, job posted 28/04/25

"Side return extension. Victorian mid-terrace." - RG30 4R, job posted 28/04/25

"Loft conversion" - READING, job posted 27/03/25

"Side return extension" - READING, job posted 27/02/25

"Single storey extension" - HENLEY-ON-THAMES, job posted 03/09/24

"Loft conversion" - READING, job posted 30/05/24

"24 x 12 sq ft size, I want to build room and bathroom" - RG1, job posted 11/04/24

"Dormer Loft conversion for semi detached property in Reading" - READING, job posted 06/04/24

"Loft conversion" - READING, job posted 07/02/24

"Loft conversion" - READING, job posted 09/12/23

"Loft conversion" - READING, job posted 22/09/23

"Loft conversion with truss roof either a double bedroom or two single. Just approx prices at the moment to see if this is something i can consider please. Im not at the stage yet to arrange a viewing for a quote." - READING, job posted 14/09/23

"Loft conversion" - READING, job posted 12/09/23

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 RG4 extension builders rates

Compare RG4 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Caversham	£38	£265
Extension Builders near Reading	£42	£266
Extension Builders near Woodley	£42	£266
Extension Builders near Wokingham	£41	£279
Extension Builders near Bracknell Forest	£41	£287
Extension Builders near Bracknell	£41	£285
Extension Builders near Maidenhead	£41	£273
Extension Builders near Sandhurst	£41	£283
Extension Builders near South Oxfordshire	£36	£253
Extension Builders near Wycombe	£39	£271

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 - £26,152

Garden office - £10,152

Granny annexe - £87,152

Build a flat roof extension - £22,152

Convert a Garage - £16,152

Hip to gable loft conversion - £42,152

Convert a bungalow loft - £29,152

Build a dormer loft conversion - £42,152

Build a swimming pool - £81,152

Build a Mansard loft conversion - £52,152

Concrete foundations - £6,402

Underpin a building - £17,652

Two storey extension - £88,228

Convert a basement - £39,210

Side return extension - £43,210

Loft conversion - £35,175

Garage - £18,652

Single storey extension - £58,040

Outbuilding - £10,152

Install an RSJ - £2,352

Build a kitchen extension - £42,152

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