Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.73 (20 reviews)

Find affordable S12 extension builders - average £37/hr

Prices range from cheapest £28/hour and £233/day (Oliver Wild Ltd) to £108/hour and £1080/day (C S Roofing & Building)

HaMuch is Excellent

Local S12 extension builders

"Loft conversion" - S8

"Design, manufacture, deliver and install modular buildings for residential and commercial use across UK public sector projects. New Build" - WILLIAMS, S9

"Construction and repair works including resurfacing driveways, patios, paths and external hardstanding areas, plus associated drainage and groundworks. Construction & Asset" - WILLIAMS, S9

"Two storey extension" - S20

"Ext.dhtyhui bfyjuuijk bhh" - S1

"Bricks wall for conservatory 1 m h for 5m w × 3 m l Also a concrete base 5m × 3 m" - HELEN, S12

"Garage" - SHEFFIELD

"Two storey extension" - SHEFFIELD

"I would like a loft conversion with a minimum cost such as velux/skylight conversion" - HARUMI, S13

"RSJ installation" - SHEFFIELD

"RSJ installation" - ANTHONY, SHEFFIELD

"Ref: Single storey extension. Hi, Can I please have a quote for rear extension on a semi detached house? Looking to extend the kitchen by 2m and build a room on the end of that. Approx 3m wide x 6m long total plus a porch on the side of the house on the alley. Location: Sheffield Kind Regards, ..." - DOM, SHEFFIELD

"Single storey extension" - SHEFFIELD

"Attention Construction Businesses The Dynamic Purchasing System (DPS) for Major and Minor Construction Works (2025) is open for eligible suppliers, offering a range of services from plumbing, roofing, to new builds, mainly for social housing and commercial properties. Bid proposals are needed by 21..." - PRECIOUS, S9

"Loft conversion" - ROSANNA, SHEFFIELD

"Build an outbuilding" - SHEFFIELD

"Single storey wraparound extension vs single storey side extension plus rear double extension" - PRIYA, SHEFFIELD

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 S12 extension builders rates

Compare S12 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Sheffield	£30	£246
Extension Builders near Dronfield	£31	£253
Extension Builders near Rotherham	£29	£226
Extension Builders near Wickersley	£29	£224
Extension Builders near Chesterfield	£29	£225
Extension Builders near Worksop	£29	£233
Extension Builders near Barnsley	£27	£210
Extension Builders near Mansfield Woodhouse	£29	£227
Extension Builders near Sutton-in-Ashfield	£28	£231
Extension Builders near Doncaster	£26	£208

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 - £26,496

Garden office - £10,496

Granny annexe - £87,496

Build a flat roof extension - £22,496

Convert a Garage - £16,496

Hip to gable loft conversion - £42,496

Convert a bungalow loft - £29,496

Build a dormer loft conversion - £42,496

Build a swimming pool - £81,496

Build a Mansard loft conversion - £52,496

Concrete foundations - £6,746

Underpin a building - £17,996

Two storey extension - £88,744

Convert a basement - £43,080

Side return extension - £47,080

Loft conversion - £38,400

Garage - £18,996

Single storey extension - £64,920

Outbuilding - £10,496

Install an RSJ - £2,696

Build a kitchen extension - £42,496

More extensions & conversions cost guides...

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