Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.56 (17 reviews)

Find local affordable SS1 extension builders

Cheapest £32/hour & £215/day (JLS Building Services) to £42/hour & £282/day (Essex Building Solutions) - average £37/hour & £247/day

Sort by rates or availability

"Convert a bungalow loft" - SS2, job posted 16/09/26

"Dormer loft conversion" - SS2, job posted 16/09/26

"Loft conversion" - SS4, job posted 15/09/26

"Hip to gable Loft conversion" - SS0, job posted 20/05/26

"Build a hip to gable loft conversion" - SS0, job posted 19/05/26

"Single storey extension" - SOUTHEND-ON-SEA, job posted 22/08/25

"Single storey kitchen diner extension" - SOUTHEND-ON-SEA, job posted 20/07/25

"Swimming pool" - SOUTHEND-ON-SEA, job posted 07/06/25

"Single storey extension" - SOUTHEND-ON-SEA, job posted 10/05/25

"Loft conversion" - SOUTHEND-ON-SEA, job posted 31/03/25

"Loft conversion" - SOUTHEND-ON-SEA, job posted 08/01/25

"Single storey extension connecting kitchen to garage to create a kitchen /diner extension" - SS1, job posted 13/09/24

"Loft conversion" - SOUTHEND-ON-SEA, job posted 11/09/24

"Single storey extension" - SOUTHEND, job posted 22/07/24

"Loft conversion" - SOUTHEND-ON-SEA, job posted 23/04/24

"Loft conversion" - SOUTHEND-ON-SEA, job posted 06/12/23

"Loft conversion" - SOUTHEND-ON-SEA, job posted 05/08/23

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 SS1 extension builders rates

Compare SS1 extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Southend-on-Sea	£37	£247
Extension Builders near Canvey Island	£39	£256
Extension Builders near Thundersley	£38	£251
Extension Builders near Rayleigh	£39	£252
Extension Builders near Wickford	£39	£255
Extension Builders near Basildon	£39	£251
Extension Builders near Stanford-le-Hope	£40	£254
Extension Builders near Gillingham	£39	£253
Extension Builders near Sittingbourne	£35	£246
Extension Builders near Billericay	£38	£248

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 - £26,000

Garden office - £10,000

Granny annexe - £87,000

Build a flat roof extension - £22,000

Convert a Garage - £16,000

Hip to gable loft conversion - £42,000

Convert a bungalow loft - £29,000

Build a dormer loft conversion - £42,000

Build a swimming pool - £81,000

Build a Mansard loft conversion - £52,000

Concrete foundations - £6,250

Underpin a building - £17,500

Two storey extension - £88,000

Convert a basement - £37,500

Side return extension - £41,500

Loft conversion - £33,750

Garage - £18,500

Single storey extension - £55,000

Outbuilding - £10,000

Install an RSJ - £2,200

Build a kitchen extension - £42,000

More extensions & conversions cost guides...

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