Name: Extension Builder
Brand: HaMuch
SKU: extension-renovation
Rating: 4.71 (19 reviews)

Find affordable Sunbury-on-thames extension builders

Prices range from cheapest £37/hour and £237/day (Tota Builders) to £48/hour and £310/day (ZNS Construction) - average £43/hr and £275/day

HaMuch is Excellent

Local Sunbury-on-thames extension builders, reviews & latest jobs

"Porch construction on the side entrance of the house" - TW3, job posted 21/08/26

"Basement conversion" - TW2, job posted 04/05/26

"Loft conversion" - TW14, job posted 23/10/25

"Loft conversion" - TW14, job posted 19/10/25

"Loft conversion of a small 3 bed end of terrace. Currently gang nail truss. Ending up with 3 velux to the front and a pitched dormer to the rear. Architect and engineer plans available." - WEST MOLESEY, job posted 08/09/25

"Outbuilding" - STAINES-UPON-THAMES, job posted 06/08/25

"Loft conversion" - TWICKENHAM, job posted 01/07/25

"Granny annexe" - TWICKENHAM, job posted 30/06/25

"Infill extension and movement of toilet" - KT7, job posted 21/05/25

"Want to build a outbuilding 6meters by 4 meters with brick fibre roof 1 double glazing door 1 glazing window will need to do electrics to the outhouse fit in lighting and plug sockets" - HESTON, job posted 08/05/25

"Loft conversion" - TW14, job posted 07/05/25

"Single storey extension" - SHEPPERTON, job posted 06/03/25

"Looking for a conservatory with tiled roof and windows. Dimension 4m by 4m." - TW19, job posted 03/03/25

"Loft conversion" - TWICKENHAM, job posted 03/03/25

"Two storey extension" - KT2, job posted 16/02/25

"Concrete foundation" - HOUNSLOW, job posted 17/01/25

"Garage" - WEYBRIDGE, job posted 28/10/24

"Erection of new 7mx4m Outbuilding in back Garden for use as Gym/Office" - TW15, job posted 17/06/24

"Loft conversion" - TWICKENHAM, job posted 03/06/24

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 Sunbury-on-thames extension builders rates

Compare Sunbury-on-thames extension builders rates (excluding VAT or callout charges)
Location in UK	Hourly Rate	Daily Rate
Extension Builders near Sunbury-on-Thames	£42	£279
Extension Builders near West Molesey	£43	£279
Extension Builders near Walton-on-Thames	£43	£277
Extension Builders near Elmbridge	£43	£277
Extension Builders near Richmond Upon Thames	£43	£274
Extension Builders near Esher	£43	£274
Extension Builders near Hounslow	£43	£281
Extension Builders near Staines-upon-Thames	£42	£269
Extension Builders near New Haw	£43	£273
Extension Builders near Kingston Upon Thames	£43	£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 - £26,184

Garden office - £10,184

Granny annexe - £87,184

Build a flat roof extension - £22,184

Convert a Garage - £16,184

Hip to gable loft conversion - £42,184

Convert a bungalow loft - £29,184

Build a dormer loft conversion - £42,184

Build a swimming pool - £81,184

Build a Mansard loft conversion - £52,184

Concrete foundations - £6,434

Underpin a building - £17,684

Two storey extension - £88,276

Convert a basement - £39,570

Side return extension - £43,570

Loft conversion - £35,475

Garage - £18,684

Single storey extension - £58,680

Outbuilding - £10,184

Install an RSJ - £2,384

Build a kitchen extension - £42,184

More extensions & conversions cost guides...

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