Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.63 (8 reviews)

Find affordable S18 extension builders

Prices range from cheapest £27/hour and £161/day (JON WINDLE CONSTRUCTION) to £108/hour and £1080/day (C S Roofing & Building) - average £39/hr and £323/day

HaMuch is Excellent

Local S18 extension builders & latest jobs

"Extention 2 story, already got 1 story- want to got up above it to extend out" - S12, job posted 07/09/26

"Loft conversion" - S8, job posted 27/07/26

"Loft conversion" - CHESTERFIELD, job posted 18/08/25

"Single storey extension" - CHESTERFIELD, job posted 04/05/25

"Loft conversion" - CHESTERFIELD, job posted 21/04/25

"Garage" - CHESTERFIELD, job posted 17/02/25

"Single storey extension" - CHESTERFIELD, job posted 02/03/24

"All rooms of house, dormer large" - S7, job posted 08/09/23

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 S18 extension builders rates

Compare S18 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Dronfield	£35	£288
Extension Builders near Chesterfield	£33	£257
Extension Builders near Sheffield	£34	£280
Extension Builders near Rotherham	£33	£257
Extension Builders near Wickersley	£33	£257
Extension Builders near Worksop	£33	£265
Extension Builders near Alfreton	£34	£261
Extension Builders near Sutton-in-Ashfield	£33	£265
Extension Builders near Mansfield Woodhouse	£33	£263
Extension Builders near Kirkby-in-Ashfield	£34	£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 - £26,584

Garden office - £10,584

Granny annexe - £87,584

Build a flat roof extension - £22,584

Convert a Garage - £16,584

Hip to gable loft conversion - £42,584

Convert a bungalow loft - £29,584

Build a dormer loft conversion - £42,584

Build a swimming pool - £81,584

Build a Mansard loft conversion - £52,584

Concrete foundations - £6,834

Underpin a building - £18,084

Two storey extension - £88,876

Convert a basement - £44,070

Side return extension - £48,070

Loft conversion - £39,225

Garage - £19,084

Single storey extension - £66,680

Outbuilding - £10,584

Install an RSJ - £2,784

Build a kitchen extension - £42,584

More extensions & conversions cost guides...

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