Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.5 (2 reviews)

Find affordable Amersham extension builders

Cheapest £27/hour & £253/day (Loudwater Building Services) to £48/hour & £431/day (KATELL PROPERTY MAINTENANCE) - average £42/hour & £292/day

Local Amersham extension builders with reviews/jobs - Sort by rates or availability

"Loft conversion" - BEACONSFIELD, job posted 15/10/25

"Single storey extension" - CHESHAM, job posted 06/03/24

"Do not use this company, they caused over £350000 worth defects on a new build, this is still ongoing, property built in 2009, still having issues in 2018." - LONDON,reviewed 02/02/18, CLIVE BOWDEN

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 Amersham extension builders rates

Compare Amersham extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Chesham	£42	£277
Extension Builders near Hazlemere	£40	£272
Extension Builders near Rickmansworth	£42	£278
Extension Builders near Gerrards Cross	£43	£282
Extension Builders near Berkhamsted	£41	£263
Extension Builders near Dacorum	£42	£269
Extension Builders near Hemel Hempstead	£42	£270
Extension Builders near High Wycombe	£39	£272
Extension Builders near Watford	£43	£278
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 - £26,224

Garden office - £10,224

Granny annexe - £87,224

Build a flat roof extension - £22,224

Convert a Garage - £16,224

Hip to gable loft conversion - £42,224

Convert a bungalow loft - £29,224

Build a dormer loft conversion - £42,224

Build a swimming pool - £81,224

Build a Mansard loft conversion - £52,224

Concrete foundations - £6,474

Underpin a building - £17,724

Two storey extension - £88,336

Convert a basement - £40,020

Side return extension - £44,020

Loft conversion - £35,850

Garage - £18,724

Single storey extension - £59,480

Outbuilding - £10,224

Install an RSJ - £2,424

Build a kitchen extension - £42,224

More extensions & conversions cost guides...

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