Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.63 (20 reviews)

Find local affordable B23 extension builders

Cheapest £21/hour & £196/day (All Build Contractors) to £36/hour & £266/day (Sanwood) - average £29/hour & £224/day

Sort by rates or availability

"Build a kitchen extension" - B8, job posted 16/09/26

"RSJ installation" - BIRMINGHAM, job posted 13/04/26

"Door into garagefrom kitchen how much" - B74, job posted 20/02/26

"Garage conversion (separate from main house) into a bedroom" - B42, job posted 17/02/26

"Rear single storey extension 18sm kitchen & shower room with 2 beams" - B36, job posted 26/11/25

"Two storey extension" - WEST MIDLANDS, job posted 05/10/25

"Two storey extension" - WEST MIDLANDS, job posted 03/08/25

"Two storey extension" - WEST MIDLANDS, job posted 08/06/25

"Looking for someone to install my extension floor up to insulation level. All materials provided labour only. I can provide pictures" - B76, job posted 18/04/25

"Side return extension" - BIRMINGHAM, job posted 24/02/25

"Build an outbuilding" - B44, job posted 15/02/25

"Loft conversion" - BIRMINGHAM, job posted 07/01/25

"RSJ installation" - BIRMINGHAM, job posted 03/01/25

"Side return extension" - BIRMINGHAM, job posted 05/12/24

"Loft conversion" - SUTTON, job posted 24/11/24

"Loft conversion" - BIRMINGHAM, job posted 19/11/24

"House kitchen Extension" - BIRMINGHAM, job posted 29/10/24

"Had work carried out at the property, was very pleased with AllBuild and the staff, work turned out astonishing" - FOUR OAKS,reviewed 27/09/17, OLIVER

"Concrete foundation for footings" - B35, job posted 27/10/24

"Side return extension" - BIRMINGHAM, job posted 07/10/24

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 B23 extension builders rates

Compare B23 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Sutton Coldfield	£29	£228
Extension Builders near Birmingham	£29	£227
Extension Builders near Smethwick	£29	£226
Extension Builders near West Bromwich	£29	£227
Extension Builders near Sandwell	£29	£229
Extension Builders near Walsall	£29	£226
Extension Builders near Oldbury	£29	£227
Extension Builders near Wednesbury	£29	£227
Extension Builders near Darlaston	£29	£226
Extension Builders near Tipton	£29	£227

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 - £25,792

Garden office - £9,792

Granny annexe - £86,792

Build a flat roof extension - £21,792

Convert a Garage - £15,792

Hip to gable loft conversion - £41,792

Convert a bungalow loft - £28,792

Build a dormer loft conversion - £41,792

Build a swimming pool - £80,792

Build a Mansard loft conversion - £51,792

Concrete foundations - £6,042

Underpin a building - £17,292

Two storey extension - £87,688

Convert a basement - £35,160

Side return extension - £39,160

Loft conversion - £31,800

Garage - £18,292

Single storey extension - £50,840

Outbuilding - £9,792

Install an RSJ - £1,992

Build a kitchen extension - £41,792

More extensions & conversions cost guides...

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