Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.73 (15 reviews)

Find affordable Knowle extension builders

Extension builders rates in Knowle range from £15/hour £128/day (J s building & maintenance services limited) to £33/hour £258/day (MYBUILD). To see prices and availability now for your job click green button.

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

"Single storey extension" - WARWICKSHIRE, job posted 15/01/26

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

"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

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

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

"Loft conversion" - SOLIHULL, job posted 12/03/25

"Total cost of structural engineer report, supply and install 6M RSJ for a load bearing wall to make kitchen/diner." - B90, job posted 11/01/25

"Building two bedrooms above current garage to make a dormant bungalow into 4 bedrooms instead of 2 bedrooms." - B93, job posted 19/06/24

"Side return extension" - SOLIHULL, job posted 06/05/24

"Create a brick and tile day room off the kitchen and a utility room utilising half of the garage. The finished work in both quality of workmanship and material is to be as far as possible seamless and indistinguishable from the existing. The brickwork must be of a high standard and with good mortar..." - B91, job posted 06/03/24

"Side return extension" - SOLIHULL, job posted 10/11/23

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 Knowle extension builders rates

Compare Knowle extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Knowle	£31	£241
Extension Builders near Solihull	£29	£231
Extension Builders near Kenilworth	£29	£223
Extension Builders near Coventry	£28	£221
Extension Builders near Warwick	£28	£213
Extension Builders near Birmingham	£28	£226
Extension Builders near Leamington Spa	£27	£212
Extension Builders near Sutton Coldfield	£29	£228
Extension Builders near Smethwick	£28	£225
Extension Builders near Bedworth	£28	£219

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 - £25,808

Garden office - £9,808

Granny annexe - £86,808

Build a flat roof extension - £21,808

Convert a Garage - £15,808

Hip to gable loft conversion - £41,808

Convert a bungalow loft - £28,808

Build a dormer loft conversion - £41,808

Build a swimming pool - £80,808

Build a Mansard loft conversion - £51,808

Concrete foundations - £6,058

Underpin a building - £17,308

Two storey extension - £87,712

Convert a basement - £35,340

Side return extension - £39,340

Loft conversion - £31,950

Garage - £18,308

Single storey extension - £51,160

Outbuilding - £9,808

Install an RSJ - £2,008

Build a kitchen extension - £41,808

More extensions & conversions cost guides...

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