Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.75 (2 reviews)

Find affordable Grangemouth extension builders

Prices range from cheapest £18/hour and £28/day (CALEDONIA ROOFING LTD) to £40/hour and £289/day (Good Foundations) - average £32/hr and £223/day

HaMuch is Excellent

Local Grangemouth extension builders & latest jobs

"Loft conversion" - FK2, job posted 03/09/26

"Single storey extension. Looking at brick vs timber frame costs." - FALKIRK, job posted 12/09/25

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 Grangemouth extension builders rates

Compare Grangemouth extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Grangemouth	£32	£214
Extension Builders near Falkirk	£31	£208
Extension Builders near Bo'ness	£33	£241
Extension Builders near Alloa	£33	£229
Extension Builders near Bathgate	£28	£214
Extension Builders near West Lothian	£33	£242
Extension Builders near Dunfermline	£46	£285
Extension Builders near Broxburn	£34	£251
Extension Builders near Cumbernauld	£31	£234
Extension Builders near Livingston	£35	£256

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 - £25,784

Garden office - £9,784

Granny annexe - £86,784

Build a flat roof extension - £21,784

Convert a Garage - £15,784

Hip to gable loft conversion - £41,784

Convert a bungalow loft - £28,784

Build a dormer loft conversion - £41,784

Build a swimming pool - £80,784

Build a Mansard loft conversion - £51,784

Concrete foundations - £6,034

Underpin a building - £17,284

Two storey extension - £87,676

Convert a basement - £35,070

Side return extension - £39,070

Loft conversion - £31,725

Garage - £18,284

Single storey extension - £50,680

Outbuilding - £9,784

Install an RSJ - £1,984

Build a kitchen extension - £41,784

More extensions & conversions cost guides...

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