Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.8 (5 reviews)

Find affordable Kettering extension builders

Prices range from cheapest £25/hour and £184/day (Ascot Property Solutions Limited) to £41/hour and £272/day (Surrounding Villages Builders Limited) - average £34/hr and £233/day

HaMuch is Excellent

Local Kettering extension builders & latest jobs

"Loft extension: Construction of two rooms, small landing and permanent access stairs. Designs and steal calculations have been completed. Council has confirmed extension is within permitted development." - KETTERING, job posted 26/09/25

"**Ravens House Refurbishment – North Northamptonshire Council { internal refurbishment}** North Northamptonshire Council invites bids for £250,000 refurbishment works at Raven House Children’s Home, Corby. Scope includes minor roof repairs, internal refurbishments, underground drainage..." - NN16, job posted 15/05/25

"Loft conversion , looking for quotes for a loft conversion with dorma preferably because of room and height. We’re looking for the shell with plumbing and electrics . No plans drawn up as of yet." - NN14, job posted 12/03/25

"Velux Loft conversion without structural changes - Detached house - Property owner - No plans drawn up yet Convert residential loft into new bedroom and landing space. Property is only three years old. Current thinking is to fit two velux windows to front which match surrounding property, and..." - KETTERING, job posted 23/10/23

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 Kettering extension builders rates

Compare Kettering extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Kettering	£34	£237
Extension Builders near Corby	£30	£214
Extension Builders near Wellingborough	£39	£251
Extension Builders near Market Harborough	£31	£217
Extension Builders near Rushden	£34	£231
Extension Builders near Northampton	£35	£239
Extension Builders near Stamford	£35	£248
Extension Builders near Huntingdonshire	£36	£290
Extension Builders near Wigston	£28	£209
Extension Builders near Bedford	£45	£278

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 - £25,864

Garden office - £9,864

Granny annexe - £86,864

Build a flat roof extension - £21,864

Convert a Garage - £15,864

Hip to gable loft conversion - £41,864

Convert a bungalow loft - £28,864

Build a dormer loft conversion - £41,864

Build a swimming pool - £80,864

Build a Mansard loft conversion - £51,864

Concrete foundations - £6,114

Underpin a building - £17,364

Two storey extension - £87,796

Convert a basement - £35,970

Side return extension - £39,970

Loft conversion - £32,475

Garage - £18,364

Single storey extension - £52,280

Outbuilding - £9,864

Install an RSJ - £2,064

Build a kitchen extension - £41,864

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