Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.7 (20 reviews)

Find affordable CF3 extension builders

Extension builders rates in CF3 range from £23/hour £173/day (1 solution) to £38/hour £254/day (Heath Windows & Doors Ltd). To see prices and availability now for your job click green button.

HaMuch is Excellent

How HaMuch Works

Post your job for free

And we will send it to CF3 extension builders

Get replies from extension builders

Available extension builders in CF3 with contact you

Choose a extension builder

Check quoted prices and select your extension builder

Find CF3 extension builders

Sort by

"Build a kitchen extension" - CARDIFF, job posted 06/10/26

"Side return extension" - CF24, job posted 21/08/26

"Hello A kitchen extension is required. Full planning has been received and structural drawings/recommendations received. Would you be interested in providing a quote? Thank you Jackie" - CF14, job posted 05/06/26

"Loft conversion" - CF23, job posted 16/05/26

"Timber frame extension" - CF3, job posted 11/02/26

"Loft conversion" - CARDIFF, job posted 01/11/25

"Kitchen extension" - CARDIFF, job posted 31/10/25

"Side return extension" - CF24, job posted 21/09/25

"Porch with toilet and shower to be built onto front of house" - CF14, job posted 24/06/25

"Build a garden office, Build a dormer loft conversion" - CF23, job posted 03/06/25

"RSJ installation to open up kitchen and utility room. About 2m wide." - CARDIFF, job posted 22/04/25

"RSJ installation" - CARDIFF, job posted 22/04/25

"Single storey extension" - CF24, job posted 09/04/25

"Looking for a single storey side return to extend kitchen / living space." - CF23, job posted 25/03/25

"Side return extension" - CF24, job posted 25/03/25

"Looking for a single storey side return to extend kitchen / living space." - CF23, job posted 25/03/25

"Side return extension" - CF24, job posted 11/01/25

"Loft conversion with en suite" - CARDIFF, job posted 29/12/24

"Loft conversion" - CARDIFF, job posted 20/11/24

"Loft conversion" - CARDIFF, job posted 23/09/24

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 CF3 extension builders rates

Compare CF3 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Cardiff	£34	£219
Extension Builders near Caerphilly	£33	£208
Extension Builders near Risca	£32	£218
Extension Builders near Newport	£41	£233
Extension Builders near Penarth	£35	£219
Extension Builders near Church Village	£34	£214
Extension Builders near Cwmbran	£43	£219
Extension Builders near Pontypridd	£33	£211
Extension Builders near Barry	£33	£223
Extension Builders near Clevedon	£32	£243

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 - £25,720

Garden office - £9,720

Granny annexe - £86,720

Build a flat roof extension - £21,720

Convert a Garage - £15,720

Hip to gable loft conversion - £41,720

Convert a bungalow loft - £28,720

Build a dormer loft conversion - £41,720

Build a swimming pool - £80,720

Build a Mansard loft conversion - £51,720

Concrete foundations - £5,970

Underpin a building - £17,220

Two storey extension - £87,580

Convert a basement - £34,350

Side return extension - £38,350

Loft conversion - £31,125

Garage - £18,220

Single storey extension - £49,400

Outbuilding - £9,720

Install an RSJ - £1,920

Build a kitchen extension - £41,720

More extensions & conversions cost guides...

People in CF3 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