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

Find affordable B11 extension builders

Prices range from cheapest £15/hour and £128/day (J s building & maintenance services limited) to £33/hour and £255/day (Redbrickz Property Management Ltd) - average £28/hr and £223/day

HaMuch is Excellent

Local B11 extension builders & latest jobs

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

"Install shade in the garden." - B92, job posted 05/09/26

"Build a kitchen extension" - B13, job posted 28/08/26

"Refurb whole house" - B92, job posted 09/08/26

"Garage conversion" - B92, job posted 02/06/26

"Loft conversion" - B30, job posted 26/05/26

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

"RSJ installation" - B90, job posted 08/03/26

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

"Dormer loft conversion" - SOLIHULL, job posted 02/11/25

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

"Concrete foundation" - B29, job posted 03/09/25

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

"Timber frame extension At present there is a side garage which is in a state of disrepair, on a lower height to the house. Ideally we would like to have a wooden extension along the complete side of the house at the same height as the house, as well as across the rear of the house. We would also..." - B26, job posted 18/07/25

"Two storey extension" - SOLIHULL, job posted 05/07/25

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

"Loft conversion" - B28, job posted 26/05/25

"Two storey extension" - SOLIHULL, job posted 01/04/25

"Rear extension to incorporate toilet and downstairs shower, utility area." - SHELDON, job posted 21/03/25

"We would like a builder for a 3m extension to the back of our house (similar to a conservatory)." - B30, job posted 15/03/25

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 B11 extension builders rates

Compare B11 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Birmingham	£29	£227
Extension Builders near Solihull	£29	£231
Extension Builders near Smethwick	£29	£226
Extension Builders near Oldbury	£29	£227
Extension Builders near Sutton Coldfield	£29	£228
Extension Builders near Knowle	£31	£241
Extension Builders near Halesowen	£29	£227
Extension Builders near West Bromwich	£29	£227
Extension Builders near Rowley Regis	£29	£226
Extension Builders near Sandwell	£29	£229

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...

People in B11 searching for a Extension Builder also viewed...

Painter and Decorator

The Largest Database of UK Trade Rates

At HaMuch we know what tradespeople charge because we have the largest database of rates anywhere in the UK. If you want quotes for jobs at the right price for you, post your jobs with HaMuch and get your home improvements kickstarted straight away!

Appliance Repair Specialist

Conservatory Specialist