Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.6 (5 reviews)

Find affordable Weymouth extension builders

Prices range from cheapest £22/hour and £184/day (Dorset Build & Maintenance Company Limited) to £40/hour and £317/day (Roofix and Build Ltd) - average £31/hr and £254/day

HaMuch is Excellent

Local Weymouth extension builders & latest jobs

"Sash window repair old period property" - DT4, job posted 29/01/26

"Loft conversion" - WEYMOUTH, job posted 21/09/24

"Loft conversion" - WEYMOUTH, job posted 07/09/24

"Hip to gable loft conversion" - WEYMOUTH, job posted 30/08/24

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 Weymouth extension builders rates

Compare Weymouth extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Weymouth	£33	£260
Extension Builders near Dorchester	£30	£230
Extension Builders near Poole	£38	£250
Extension Builders near Yeovil	£34	£294
Extension Builders near Bournemouth	£38	£257
Extension Builders near South Somerset	£62	£270
Extension Builders near Taunton	£31	£242
Extension Builders near Salisbury	£35	£247

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 - £26,032

Garden office - £10,032

Granny annexe - £87,032

Build a flat roof extension - £22,032

Convert a Garage - £16,032

Hip to gable loft conversion - £42,032

Convert a bungalow loft - £29,032

Build a dormer loft conversion - £42,032

Build a swimming pool - £81,032

Build a Mansard loft conversion - £52,032

Concrete foundations - £6,282

Underpin a building - £17,532

Two storey extension - £88,048

Convert a basement - £37,860

Side return extension - £41,860

Loft conversion - £34,050

Garage - £18,532

Single storey extension - £55,640

Outbuilding - £10,032

Install an RSJ - £2,232

Build a kitchen extension - £42,032

More extensions & conversions cost guides...

People in Weymouth searching for a Extension Builder also viewed...

Painter and Decorator

The Largest Database of UK Trade Rates

At HaMuch we know what tradespeople charge because we have the largest database of rates anywhere in the UK. If you want quotes for jobs at the right price for you, post your jobs with HaMuch and get your home improvements kickstarted straight away!

Appliance Repair Specialist

Conservatory Specialist