Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.75 (8 reviews)

Find affordable Crawley extension builders

Prices range from cheapest £21/hour and £161/day (JUST ONE BUILDING SERVICES) to £45/hour and £292/day (DPP Construction (David Price Partnership)) - average £35/hr and £240/day

HaMuch is Excellent

Local Crawley extension builders, reviews & latest jobs

"Loft conversion" - RH12, job posted 27/07/26

"Initially back garden extension beyond 3 meters single story. I know prior approval and other steps involved. We are looking for cheapest options. Other projects down the line include Kitchen and front extension plus roof tiling etc." - RH11, job posted 31/05/26

"Loft conversion" - RH10, job posted 27/12/25

"Please can I get a quote? I would like a garage conversion done according to planning regulations within the rules so I don't require planning permission. I don't want any extensions of the building Simply require the current garage to be converted to a self contained studio with a small toilet..." - RH10, job posted 09/10/24

"Garage conversion" - CRAWLEY, job posted 09/10/24

"Side return extension" - CRAWLEY, job posted 09/08/24

"Side return extension" - CRAWLEY, job posted 22/03/24

"Looking for a builder - who should provide an one stop solution to complete the below job: 1) Convert the Conservatory in to a living space 2) Store room to Study / Work space 3) Side to Rear extension: to have a studio type arrangement (Bed room, shower cubicle, small cloak room). 4) And..." - RH11, job posted 22/12/23

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 Crawley extension builders rates

Compare Crawley extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Crawley	£38	£255
Extension Builders near Horley	£38	£258
Extension Builders near Mid Sussex	£35	£261
Extension Builders near East Grinstead	£37	£259
Extension Builders near Horsham	£38	£265
Extension Builders near Haywards Heath	£35	£256
Extension Builders near Redhill	£41	£269
Extension Builders near Reigate	£40	£270
Extension Builders near Burgess Hill	£36	£240
Extension Builders near Reigate & Banstead	£41	£271

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 - £26,008

Garden office - £10,008

Granny annexe - £87,008

Build a flat roof extension - £22,008

Convert a Garage - £16,008

Hip to gable loft conversion - £42,008

Convert a bungalow loft - £29,008

Build a dormer loft conversion - £42,008

Build a swimming pool - £81,008

Build a Mansard loft conversion - £52,008

Concrete foundations - £6,258

Underpin a building - £17,508

Two storey extension - £88,012

Convert a basement - £37,590

Side return extension - £41,590

Loft conversion - £33,825

Garage - £18,508

Single storey extension - £55,160

Outbuilding - £10,008

Install an RSJ - £2,208

Build a kitchen extension - £42,008

More extensions & conversions cost guides...

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