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GAB Design
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
"Convert a bungalow loft" - SS2, job posted 16/09/26
WDC LTD T/A
Experienced extension builder ready to quote for your work. WDC LTD T/A is the best extension builder in Thundersley. No obligation free quotes and...
"Dormer loft conversion" - SS2, job posted 16/09/26
Livinston & Son Ltd
Livinston & Son Ltd are here to help customers who need an Extension Builder in Thundersley. We offer a competitive rate to complete all your exten...
"Loft conversion" - SS4, job posted 15/09/26
Fox Conversions Limited
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
"My wall outside back it falling down small wall. Repairing my front wall that crumbling. Quote etc. thanks" - SS14, job posted 08/06/26
Anglian Preservation
Anglian Preservation is an established and experienced local extension builder in Thundersley. Please contact us for a free, no obligation quote an...
"Hip to gable Loft conversion" - SS0, job posted 20/05/26
Thoroughbuild UK Services Ltd
Frederick Head
Over 35 years experience
We are Gas Safe registered
We are Verified
We pride ourselves on great custom...
"Build a hip to gable loft conversion" - SS0, job posted 19/05/26
Ellis & James Builders Limited
Darren Spencer
Need an Extension Builder in Thundersley? Ellis & James Builders Limited has been helping local clients (20 mile radius) with their extension build...
"Install an RSJ" - SS7, job posted 16/03/26
Witton & Pearce Builders in Essex
Witton & Pearce Builders in Essex is a trusted extension builder serving customers in Thundersley and the surrounding area. Contact us to today to ...
"Two storey side extension and single storey rear extension." - BASILDON, job posted 18/04/25
Capital Roofing Ltd
Billy Baverstock
Experienced extension builder ready to quote for your work. Capital Roofing Ltd is the best extension builder in Thundersley. No obligation free qu...
"Two storey extension" - BASILDON, job posted 18/04/25
Property Maintenance
Property Maintenance are here to help customers who need an Extension Builder in Thundersley. We offer a competitive rate to complete all your exte...
"Loft conversionloftc" - SS13, job posted 08/05/24
JLS Building Services
Need to find an Extension Builder near you for all your extension buildering work?
JLS Building Services provides a local, trusted extensio...
"Single storey rear extension" - BASILDON, job posted 07/12/23
CONCORD BUILDERS LIMITED
Need an Extension Builder in Thundersley? CONCORD BUILDERS LIMITED has been helping local clients (20 mile radius) with their extension buildering ...
RV BUILDING & MAINTENANCE
Need to find an Extension Builder near you for all your extension buildering work?
RV BUILDING & MAINTENANCE provides a local, trusted exte...
HIGHLAND CONSTRUCTION
Experienced extension builder ready to quote for your work. HIGHLAND CONSTRUCTION is the best extension builder in Thundersley. No obligation free ...
Royal Roofing & building contractors
Swaylie Cooper
Royal Roofing & building contractors is an established and experienced local extension builder in Thundersley. Please contact us for a free, no ob...
DG Construction Essex Ltd
Need an Extension Builder in Thundersley? DG Construction Essex Ltd has been helping local clients (20 mile radius) with their extension buildering...
CLARK CONSTRUCTION
Trusted and professional extension builder in Thundersley. Experienced in all extension buildering work and keeping within budget and on quote. CLA...
Concept Interiors Management Ltd
Concept Interiors Management Ltd is a trusted extension builder serving customers in Thundersley and the surrounding area. Contact us to today to g...
Warton Woodworks
Experienced extension builder ready to quote for your work. Warton Woodworks is the best extension builder in Thundersley. No obligation free quote...
Compare Thundersley extension builders rates
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Extension Builders near Thundersley | £38 | £251 |
| Extension Builders near Rayleigh | £39 | £252 |
| Extension Builders near Canvey Island | £39 | £256 |
| Extension Builders near Wickford | £39 | £255 |
| Extension Builders near Basildon | £39 | £251 |
| Extension Builders near Southend-on-Sea | £37 | £247 |
| Extension Builders near Stanford-le-Hope | £40 | £254 |
| Extension Builders near Billericay | £38 | £248 |
| Extension Builders near Brentwood | £39 | £255 |
| Extension Builders near Thurrock | £41 | £260 |
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 - £26,040

Garden office - £10,040

Granny annexe - £87,040

Build a flat roof extension - £22,040

Convert a Garage - £16,040

Hip to gable loft conversion - £42,040

Convert a bungalow loft - £29,040

Build a dormer loft conversion - £42,040

Build a swimming pool - £81,040

Build a Mansard loft conversion - £52,040

Concrete foundations - £6,290

Underpin a building - £17,540

Two storey extension - £88,060

Convert a basement - £37,950

Side return extension - £41,950

Loft conversion - £34,125

Garage - £18,540

Single storey extension - £55,800

Outbuilding - £10,040

Install an RSJ - £2,240

Build a kitchen extension - £42,040
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