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

Find affordable B34 extension builders

Cheapest £15/hour & £128/day (J s building & maintenance services limited) to £33/hour & £248/day (LC BUILDING SERVICES) - average £27/hour & £215/day

Local B34 extension builders with reviews/jobs - Sort by rates or availability

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

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

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

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

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

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

"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

"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

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

"TV aerial install" - B11, job posted 05/03/25

"Timber frame extension to add 2nd floor to 80sqm bungalow and add a 36sqm kitchen extension." - WARWICKSHIRE, job posted 27/02/25

"Timber frame extension" - WARWICKSHIRE, job posted 27/02/25

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

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 B34 extension builders rates

Compare B34 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 Solihull	£29	£231
Extension Builders near Smethwick	£29	£226
Extension Builders near Knowle	£31	£241
Extension Builders near Oldbury	£29	£227
Extension Builders near West Bromwich	£29	£227
Extension Builders near Tamworth	£33	£288
Extension Builders near Sandwell	£29	£229
Extension Builders near Walsall	£29	£226

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 - £25,720

Garden office - £9,720

Granny annexe - £86,720

Build a flat roof extension - £21,720

Convert a Garage - £15,720

Hip to gable loft conversion - £41,720

Convert a bungalow loft - £28,720

Build a dormer loft conversion - £41,720

Build a swimming pool - £80,720

Build a Mansard loft conversion - £51,720

Concrete foundations - £5,970

Underpin a building - £17,220

Two storey extension - £87,580

Convert a basement - £34,350

Side return extension - £38,350

Loft conversion - £31,125

Garage - £18,220

Single storey extension - £49,400

Outbuilding - £9,720

Install an RSJ - £1,920

Build a kitchen extension - £41,720

More extensions & conversions cost guides...

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