Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.63 (8 reviews)

Find affordable Guildford extension builders

Prices range from cheapest £13/hour and £214/day (Chim Me Sweep Chim Me Build) to £50/hour and £400/day (BZ GARDENS) - average £40/hr and £281/day

HaMuch is Excellent

Local Guildford extension builders & latest jobs

"Dormer loft conversion" - GODALMING, job posted 21/11/25

"Garage conversion" - GUILDFORD, job posted 11/10/25

"L shaped dormer to existing loft conversion, moving existing velux windows and moving bathroom location" - GU1, job posted 28/08/25

"RSJ installation" - GU3, job posted 13/08/25

"Single storey extension" - GU1, job posted 17/06/25

"Side return extension" - GUILDFORD, job posted 15/05/25

"Side return extension" - GUILDFORD, job posted 12/09/24

"Single storey extension" - GUILDFORD, job posted 19/04/24

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 Guildford extension builders rates

Compare Guildford extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Guildford	£53	£298
Extension Builders near Woking	£43	£277
Extension Builders near Ash Vale	£41	£277
Extension Builders near Waverley	£68	£313
Extension Builders near Aldershot	£41	£275
Extension Builders near Great Bookham	£42	£281
Extension Builders near Farnborough	£41	£273
Extension Builders near New Haw	£43	£273
Extension Builders near Farnham	£41	£276
Extension Builders near Camberley	£41	£283

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 - £26,288

Garden office - £10,288

Granny annexe - £87,288

Build a flat roof extension - £22,288

Convert a Garage - £16,288

Hip to gable loft conversion - £42,288

Convert a bungalow loft - £29,288

Build a dormer loft conversion - £42,288

Build a swimming pool - £81,288

Build a Mansard loft conversion - £52,288

Concrete foundations - £6,538

Underpin a building - £17,788

Two storey extension - £88,432

Convert a basement - £40,740

Side return extension - £44,740

Loft conversion - £36,450

Garage - £18,788

Single storey extension - £60,760

Outbuilding - £10,288

Install an RSJ - £2,488

Build a kitchen extension - £42,288

More extensions & conversions cost guides...

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