Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.7 (5 reviews)

Find affordable Southwater extension builders

Cheapest £21/hour & £161/day (JUST ONE BUILDING SERVICES) to £46/hour & £308/day (DGA Complete Construction Ltd) - average £37/hour & £255/day

Local Southwater extension builders with reviews/jobs - Sort by rates or availability

"Swimming pool" - SOUTHWATER, job posted 25/04/26

"Fit rsj/steels only to rear" - RH13, job posted 30/01/26

"Garage conversion" - HORSHAM, job posted 18/09/25

"Loft conversion" - HORSHAM, job posted 15/09/23

"Loft conversion - rear dormer on 3 bed 1930 mid terrace in Horsham. Plans and structural calcs are available." - HORSHAM, job posted 12/09/23

"DO NOT USE. R cant calculate and has told me to order more than i should have several times. Also cannot lay floors. Did awful job of mine. Wish i had not renewed it and not paid before checked the job. Email me for photos. Only good thing is he turned up when said he would although took months to..." - CRAWLEY,reviewed 01/05/18, FRAN

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 Southwater extension builders rates

Compare Southwater extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Horsham	£38	£265
Extension Builders near Mid Sussex	£35	£261
Extension Builders near Crawley	£38	£255
Extension Builders near Burgess Hill	£36	£240
Extension Builders near Haywards Heath	£35	£256
Extension Builders near Horley	£38	£258
Extension Builders near Shoreham-by-Sea	£36	£250
Extension Builders near Lancing	£37	£251
Extension Builders near Reigate	£40	£270
Extension Builders near East Grinstead	£37	£259

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 - £26,064

Garden office - £10,064

Granny annexe - £87,064

Build a flat roof extension - £22,064

Convert a Garage - £16,064

Hip to gable loft conversion - £42,064

Convert a bungalow loft - £29,064

Build a dormer loft conversion - £42,064

Build a swimming pool - £81,064

Build a Mansard loft conversion - £52,064

Concrete foundations - £6,314

Underpin a building - £17,564

Two storey extension - £88,096

Convert a basement - £38,220

Side return extension - £42,220

Loft conversion - £34,350

Garage - £18,564

Single storey extension - £56,280

Outbuilding - £10,064

Install an RSJ - £2,264

Build a kitchen extension - £42,064

More extensions & conversions cost guides...

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