Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.64 (14 reviews)

Find affordable BN45 extension builders

Extension builders rates in BN45 range from £29/hour £2/day (Rock Build Ltd) to £50/hour £287/day (Ferguson Building Services Limited). To see prices and availability now for your job click Get quotes.

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"KITCHEN EXTENSION BRIGHTON" - BN2, job posted 08/10/26

"Loft conversion" - BN1, job posted 05/09/26

"Cost to build a side return extension" - BN2, job posted 30/03/26

"Single storey extension" - BN42, job posted 06/01/26

"Loft conversion" - ENFIELD, job posted 15/12/25

"Build ground floor single story extension. 3m permitted development, house is 7.5m wide. Assume 4x velux in pitched roof" - BN1, job posted 30/09/25

"Single storey extension" - BRIGHTON AND HOVE, job posted 30/09/25

"Single storey extension" - HOVE, job posted 27/08/25

"Mansard loft conversion" - BRIGHTON AND HOVE, job posted 22/08/25

"Kitchen extension" - HOVE, job posted 03/08/25

"Single storey extension" - HOVE, job posted 06/05/25

"Convert a bungalow loft" - BN1, job posted 23/04/25

"Loft conversion" - HOVE, job posted 05/04/25

"Hi I was hoping to get a quote for the renovation of an entire house. It’s about 60 years old. I would need: 1. potential plastering of walls, r 2. removal of an existing kitchen & fitting of new 3. Removal of 1 bathroom & fitting of 2 4. garage conversion 5. flooring & carpet, ..." - BN1, job posted 05/09/24

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 BN45 extension builders rates

Compare BN45 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Brighton and Hove	£35	£251
Extension Builders near Brighton	£35	£251
Extension Builders near Shoreham-by-Sea	£36	£250
Extension Builders near Burgess Hill	£36	£240
Extension Builders near Lancing	£37	£251
Extension Builders near Haywards Heath	£35	£256
Extension Builders near Worthing	£35	£251
Extension Builders near Mid Sussex	£35	£261
Extension Builders near Horsham	£38	£265
Extension Builders near Rustington	£36	£246

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 - £25,872

Garden office - £9,872

Granny annexe - £86,872

Build a flat roof extension - £21,872

Convert a Garage - £15,872

Hip to gable loft conversion - £41,872

Convert a bungalow loft - £28,872

Build a dormer loft conversion - £41,872

Build a swimming pool - £80,872

Build a Mansard loft conversion - £51,872

Concrete foundations - £6,122

Underpin a building - £17,372

Two storey extension - £87,808

Convert a basement - £36,060

Side return extension - £40,060

Loft conversion - £32,550

Garage - £18,372

Single storey extension - £52,440

Outbuilding - £9,872

Install an RSJ - £2,072

Build a kitchen extension - £41,872

More extensions & conversions cost guides...

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