Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.62 (13 reviews)

Find affordable Darwen extension builders

Prices range from cheapest £26/hour and £154/day (COMPLETE BUILDING SERVICES) to £36/hour and £264/day (First Rate Home Builders) - average £31/hr and £224/day

HaMuch is Excellent

Local Darwen extension builders, reviews & latest jobs

"Loft conversion" - BB1, job posted 26/05/26

"Loft conversion" - BLACKBURN, job posted 24/07/25

"Loft conversion need a quote" - BLACKBURN, job posted 17/05/25

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

"Loft conversion" - BLACKBURN, job posted 25/03/25

"Loft conversion for a storage" - BB1, job posted 15/03/25

"Side return extension" - BLACKBURN, job posted 26/12/24

"Side return extension approx 7 square metres" - BLACKBURN, job posted 16/07/24

"Side return extension" - BLACKBURN, job posted 21/04/24

"Single storey extension 3metres by 6" - BB2, job posted 10/02/24

"Side return extension" - BLACKBURN, job posted 01/01/24

"Side return extension double patio doors with steal beam to remove wall" - BB2, job posted 19/12/23

"Loft conversion" - BLACKBURN, job posted 10/12/23

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 Darwen extension builders rates

Compare Darwen extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Darwen	£34	£253
Extension Builders near Blackburn	£33	£246
Extension Builders near Accrington	£33	£243
Extension Builders near Chorley	£30	£221
Extension Builders near Rawtenstall	£29	£213
Extension Builders near Horwich	£30	£219
Extension Builders near Bamber Bridge	£30	£216
Extension Builders near Bolton	£31	£219
Extension Builders near Leyland	£30	£223
Extension Builders near Bury	£30	£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 - £25,936

Garden office - £9,936

Granny annexe - £86,936

Build a flat roof extension - £21,936

Convert a Garage - £15,936

Hip to gable loft conversion - £41,936

Convert a bungalow loft - £28,936

Build a dormer loft conversion - £41,936

Build a swimming pool - £80,936

Build a Mansard loft conversion - £51,936

Concrete foundations - £6,186

Underpin a building - £17,436

Two storey extension - £87,904

Convert a basement - £36,780

Side return extension - £40,780

Loft conversion - £33,150

Garage - £18,436

Single storey extension - £53,720

Outbuilding - £9,936

Install an RSJ - £2,136

Build a kitchen extension - £41,936

More extensions & conversions cost guides...

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