Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.68 (20 reviews)

Find affordable S1 extension builders

Prices range from cheapest £28/hour and £234/day (BUILDWISER) to £36/hour and £293/day (AMB Joinery & Building Services) - average £33/hr and £265/day

Local S1 extension builders, reviews & latest jobs

"Renovated house full" - S9, job posted 12/09/26

"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

"Construction and repair works including resurfacing driveways, patios, paths and external hardstanding areas, plus associated drainage and groundworks. Construction & Asset" - S9, job posted 26/05/26

"Design, manufacture, deliver and install modular buildings for residential and commercial use across UK public sector projects. New Build" - S9, job posted 26/05/26

"Ext.dhtyhui bfyjuuijk bhh" - S1, job posted 06/05/26

"Bricks wall for conservatory 1 m h for 5m w × 3 m l Also a concrete base 5m × 3 m" - S12, job posted 09/04/26

"Garage" - SHEFFIELD, job posted 18/02/26

"Garage" - SHEFFIELD, job posted 01/02/26

"Side return extension" - SHEFFIELD, job posted 19/01/26

"Convert a conservatory to a bedroom with en-suite" - S5, job posted 06/01/26

"Two storey extension" - SHEFFIELD, job posted 23/11/25

"Side return extension" - SHEFFIELD, job posted 16/11/25

"I would like a loft conversion with a minimum cost such as velux/skylight conversion" - S13, job posted 21/09/25

"Single storey extension" - SHEFFIELD, job posted 11/09/25

"Build a mansard loft conversion" - S5, job posted 12/08/25

"Loft conversion" - SHEFFIELD, job posted 31/07/25

"RSJ installation" - SHEFFIELD, job posted 08/07/25

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 S1 extension builders rates

Compare S1 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Sheffield	£32	£261
Extension Builders near Dronfield	£33	£262
Extension Builders near Rotherham	£33	£257
Extension Builders near Wickersley	£33	£257
Extension Builders near Chesterfield	£33	£257
Extension Builders near Barnsley	£31	£242
Extension Builders near Worksop	£33	£265
Extension Builders near Doncaster	£29	£238
Extension Builders near Mansfield Woodhouse	£33	£263
Extension Builders near Holmfirth	£30	£232

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 - £26,120

Garden office - £10,120

Granny annexe - £87,120

Build a flat roof extension - £22,120

Convert a Garage - £16,120

Hip to gable loft conversion - £42,120

Convert a bungalow loft - £29,120

Build a dormer loft conversion - £42,120

Build a swimming pool - £81,120

Build a Mansard loft conversion - £52,120

Concrete foundations - £6,370

Underpin a building - £17,620

Two storey extension - £88,180

Convert a basement - £38,850

Side return extension - £42,850

Loft conversion - £34,875

Garage - £18,620

Single storey extension - £57,400

Outbuilding - £10,120

Install an RSJ - £2,320

Build a kitchen extension - £42,120

More extensions & conversions cost guides...

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