Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.63 (4 reviews)

Find affordable BN11 extension builders

Prices range from cheapest £31/hour and £225/day (Nutshell Construction) to £45/hour and £305/day (Main Construction) - average £35/hr and £252/day

HaMuch is Excellent

Local BN11 extension builders & latest jobs

"Provide solid base for 10 x 8 green house and erect it" - WEST SUSSEX, job posted 23/10/25

"Garage conversion" - WEST SUSSEX, job posted 02/01/25

"Granny annexe" - WORTHING, job posted 01/12/24

"RSJ installation" - WORTHING, job posted 25/10/24

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 BN11 extension builders rates

Compare BN11 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Worthing	£35	£251
Extension Builders near Lancing	£37	£251
Extension Builders near Shoreham-by-Sea	£36	£250
Extension Builders near Rustington	£36	£246
Extension Builders near Littlehampton	£35	£244
Extension Builders near Arun	£35	£241
Extension Builders near Brighton	£35	£251
Extension Builders near Brighton and Hove	£35	£251
Extension Builders near Bognor Regis	£35	£247
Extension Builders near Burgess Hill	£36	£240

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 - £26,016

Garden office - £10,016

Granny annexe - £87,016

Build a flat roof extension - £22,016

Convert a Garage - £16,016

Hip to gable loft conversion - £42,016

Convert a bungalow loft - £29,016

Build a dormer loft conversion - £42,016

Build a swimming pool - £81,016

Build a Mansard loft conversion - £52,016

Concrete foundations - £6,266

Underpin a building - £17,516

Two storey extension - £88,024

Convert a basement - £37,680

Side return extension - £41,680

Loft conversion - £33,900

Garage - £18,516

Single storey extension - £55,320

Outbuilding - £10,016

Install an RSJ - £2,216

Build a kitchen extension - £42,016

More extensions & conversions cost guides...

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