Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.71 (7 reviews)

Find affordable WA12 extension builders

Prices range from cheapest £15/hour and £153/day (MJ Barker & Son) to £35/hour and £254/day (Allan Rowe Property Services) - average £30/hr and £216/day

HaMuch is Excellent

Local WA12 extension builders & latest jobs

"Dormer loft conversion" - ST HELENS, job posted 02/10/25

"Loft conversion .. hip to gable to dormer loft conversion. We would like have a en-suite, bedroom plus storage space. The property is a small 3 semi detached, I would like a rough idea how much it would cost." - WARRINGTON, job posted 15/09/25

"St Helens Council has released a tender for the internal refurbishment of Thatto Heath Primary School, aimed at enhancing SEND provision. The project is scheduled to run from 21 July to 29 August 2025, with an estimated contract value of £228,000 including VAT. The opportunity is reserved..." - WA10, job posted 19/06/25

"Two storey extension" - WARRINGTON, job posted 03/04/25

"Loft conversion" - WARRINGTON, job posted 30/09/24

"Single storey extension" - WA5, job posted 06/04/24

"Single storey extension, 18m2. Bi-fold doors (approx. 5m across) and 2/3no. velux windows." - ST HELENS, job posted 27/09/23

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 WA12 extension builders rates

Compare WA12 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Newton-le-Willows	£31	£221
Extension Builders near Golborne	£30	£222
Extension Builders near Ashton-in-Makerfield	£30	£220
Extension Builders near St Helens	£31	£224
Extension Builders near Warrington	£31	£222
Extension Builders near Leigh	£31	£224
Extension Builders near Hindley	£30	£218
Extension Builders near Wigan	£30	£219
Extension Builders near Orrell	£29	£214
Extension Builders near Widnes	£31	£220

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 - £25,728

Garden office - £9,728

Granny annexe - £86,728

Build a flat roof extension - £21,728

Convert a Garage - £15,728

Hip to gable loft conversion - £41,728

Convert a bungalow loft - £28,728

Build a dormer loft conversion - £41,728

Build a swimming pool - £80,728

Build a Mansard loft conversion - £51,728

Concrete foundations - £5,978

Underpin a building - £17,228

Two storey extension - £87,592

Convert a basement - £34,440

Side return extension - £38,440

Loft conversion - £31,200

Garage - £18,228

Single storey extension - £49,560

Outbuilding - £9,728

Install an RSJ - £1,928

Build a kitchen extension - £41,728

More extensions & conversions cost guides...

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