Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.83 (12 reviews)

Find affordable HP12 extension builders now

Extension builders rates in HP12 range from £22/hour £162/day (Andy's carpets & Vinyl services) to £46/hour £431/day (E E Construction). To see prices and availability now for your job click green button.

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"Single storey extension" - HP11, job posted 25/09/26

"Single storey extension side extention with bathroom and two velux windows 5mx3.2m single story rear extention for dinner 2.6m x 3.5 m" - HP11, job posted 18/07/26

"Building cluster body cluster board cluster board and +3" - SL7, job posted 16/05/26

"Hip to gable Dormer loft conversion" - HIGH WYCOMBE, job posted 05/10/25

"Single storey extension" - MARLOW, job posted 14/08/25

"Rear and side extension to 1960s detached house" - HP14, job posted 23/07/25

"Single storey extension" - HIGH WYCOMBE, job posted 06/10/24

"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, ..." - HP10, job posted 05/09/24

"Single storey extension" - HIGH WYCOMBE, job posted 20/08/24

"Side return extension" - WYCOMBE, job posted 10/04/24

"Hi , I am looking for quote for rear extension of 76.5 sq meters? Thanks, Deven" - HP12, job posted 18/12/23

"7 by 6 rear extension plus loft conversion" - HIGH WYCOMBE, job posted 16/12/23

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 HP12 extension builders rates

Compare HP12 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near High Wycombe	£39	£272
Extension Builders near Wycombe	£40	£271
Extension Builders near Hazlemere	£40	£272
Extension Builders near Maidenhead	£41	£273
Extension Builders near Chesham	£42	£277
Extension Builders near Gerrards Cross	£43	£283
Extension Builders near Slough	£42	£272
Extension Builders near Windsor & Maidenhead	£42	£272
Extension Builders near Windsor	£41	£271
Extension Builders near Rickmansworth	£43	£282

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 - £26,200

Garden office - £10,200

Granny annexe - £87,200

Build a flat roof extension - £22,200

Convert a Garage - £16,200

Hip to gable loft conversion - £42,200

Convert a bungalow loft - £29,200

Build a dormer loft conversion - £42,200

Build a swimming pool - £81,200

Build a Mansard loft conversion - £52,200

Concrete foundations - £6,450

Underpin a building - £17,700

Two storey extension - £88,300

Convert a basement - £39,750

Side return extension - £43,750

Loft conversion - £35,625

Garage - £18,700

Single storey extension - £59,000

Outbuilding - £10,200

Install an RSJ - £2,400

Build a kitchen extension - £42,200

More extensions & conversions cost guides...

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