Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.56 (8 reviews)

Find affordable FY1 extension builders

Cheapest £25/hour & £187/day (Lords) to £34/hour & £243/day (Improve dont move Ltd) - average £29/hour & £210/day

Sort by rates or availability

"RSJ installation" - FY3, job posted 18/05/26

"Timber frame extension" - BLACKPOOL, job posted 25/01/26

"Build an outbuilding" - BLACKPOOL, job posted 22/02/25

"Single storey extension" - BLACKPOOL, job posted 09/11/24

"Remove chimney stack (3.5m approx.). Make good roof and replace flashings. Remove all debris from site." - FY5, job posted 20/07/24

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

"Loft conversion" - BLACKPOOL, job posted 13/11/23

"Loft conversion" - BLACKPOOL, job posted 20/08/23

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 FY1 extension builders rates

Compare FY1 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Blackpool	£29	£209
Extension Builders near Thornton	£29	£211
Extension Builders near Lytham St Annes	£28	£206
Extension Builders near Fleetwood	£28	£206
Extension Builders near Southport	£27	£198
Extension Builders near Penwortham	£30	£218
Extension Builders near Fulwood	£31	£217
Extension Builders near Preston	£30	£218
Extension Builders near Leyland	£30	£223
Extension Builders near Bamber Bridge	£30	£216

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 - £25,680

Garden office - £9,680

Granny annexe - £86,680

Build a flat roof extension - £21,680

Convert a Garage - £15,680

Hip to gable loft conversion - £41,680

Convert a bungalow loft - £28,680

Build a dormer loft conversion - £41,680

Build a swimming pool - £80,680

Build a Mansard loft conversion - £51,680

Concrete foundations - £5,930

Underpin a building - £17,180

Two storey extension - £87,520

Convert a basement - £33,900

Side return extension - £37,900

Loft conversion - £30,750

Garage - £18,180

Single storey extension - £48,600

Outbuilding - £9,680

Install an RSJ - £1,880

Build a kitchen extension - £41,680

More extensions & conversions cost guides...

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