Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.7 (20 reviews)

Find affordable M25 extension builders

Cheapest £25/hour & £168/day (Urban Stone Contracts Ltd) to £35/hour & £260/day (Wholesale Clothing) - average £31/hour & £224/day

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"Install an RSJ" - M27, job posted 02/09/26

"Side return extension" - M16, job posted 04/07/26

"Suppliers are invited to express interest in a tender opportunity for the supply of building construction materials to support public sector projects within the Bury area. Requirements may include construction products, aggregates, timber, concrete, building supplies, and related materials...." - BL9, job posted 09/06/26

"Single storey extension" - MANCHESTER, job posted 02/06/26

"Bungalow loft conversion" - PRESTWICH, job posted 26/04/26

"Rear extension, ensuite and living room" - M15, job posted 03/04/26

"Kitchen extension" - BL9, job posted 03/03/26

"Single storey extension" - MANCHESTER, job posted 19/01/26

"Loft conversion raising roof" - M25, job posted 13/01/26

"Loft dorma conversion" - M45, job posted 29/12/25

"Timber frame extension" - M2, job posted 26/12/25

"Side return extension" - M45, job posted 07/09/25

"Kitchen extension builders needed" - M40, job posted 08/07/25

"Need free survey on extension" - M40, job posted 02/07/25

"3mx4m rear extension" - OL10, job posted 13/06/25

"Roof top extension with a bathroom" - M40, job posted 23/03/25

"Loft conversion with a dormer. Dormer to be 4m wide and 3m deep. The rafters to the floor is only 1.85m so the ceiling would need to be dropped in a 5m by 4.3m square of it needs to hit the 2.2m regulation. Thanks for your help in advance" - M9, job posted 03/03/25

"Timber frame extension" - MANCHESTER, job posted 24/02/25

"Single storey extension" - PRESTWICH, job posted 16/02/25

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 M25 extension builders rates

Compare M25 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Prestwich	£31	£233
Extension Builders near Whitefield	£31	£229
Extension Builders near Swinton	£32	£234
Extension Builders near Salford	£32	£237
Extension Builders near Radcliffe	£30	£220
Extension Builders near Manchester	£32	£236
Extension Builders near Middleton	£31	£227
Extension Builders near Eccles	£32	£236
Extension Builders near Bury	£30	£219
Extension Builders near Heywood	£30	£221

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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