Build a single storey extension in DT1 from £39,000

Single storey extension cost in DT1 - Sort by rates or availability

Firestone Surfacing Ltd

From £52,120

(last active 15/09/26)

Location

Yeovil, BA21

Firestone Surfacing Ltd is a trusted extension builder serving customers in DT1 and the surrounding area. Contact us to today to get a competitive ...

WEYMOUTH ROOFING CO.

From £44,440

(last active 08/07/26)

Location

Weymouth, DT4

WEYMOUTH ROOFING CO. is an established and experienced local extension builder in DT1. Please contact us for a free, no obligation quote and compet...

WILD CONSTRUCTION LTD

From £58,680

(last active 08/07/26)

Location

Allington, DT6

Experienced extension builder ready to quote for your work. WILD CONSTRUCTION LTD is the best extension builder in DT1. No obligation free quotes a...

GMD Roofing

From £39,000

(last active 05/06/26)

Location

Poole, BH15

MARLEY TRained roofer, reliable ,flat roofs , slating and tiling,fascias and gutters. All repairs, no job too small

D&B Build

From £56,280

(last active 21/10/25)

Location

Poole, BH15

Need an Extension Builder in DT1? D&B Build has been helping local clients (20 mile radius) with their extension buildering jobs for many years. Ge...

Ground Up Building Services Ltd

From £57,400

(last active 21/10/25)

Location

Dorset, BH15

Ground Up Building Services Ltd is a trusted extension builder serving customers in DT1 and the surrounding area. Contact us to today to get a comp...

SPEARHEAD DESIGN & BUILD LTD

From £50,840

(last active 18/10/25)

Location

Upton, BH16

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

M & J CONSTRUCTION

From £50,840

(last active 18/10/25)

Location

Canford Heath, BH17

M & J CONSTRUCTION is an established extension buildering business in DT1. We come highly recommended and provide competitive quotes for your work....

J FLANN BUILDING & MAINTENANCE

From £58,840

Location

Weymouth, DT4

Need to find an Extension Builder near you for all your extension buildering work?

J FLANN BUILDING & MAINTENANCE provides a local, trusted...

Ed Bartlett Building Contractor

From £63,000

Location

Castleton, DT9

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Extension builder estimates (based on hourly rates) to build a single storey extension in DT1

Estimates for single storey extension near DT1

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Location in UKHourly RateDaily Rate
Single Storey Extension near Dorchester£30£230
Single Storey Extension near Weymouth£33£260
Single Storey Extension near Yeovil£34£294
Single Storey Extension near Poole£38£250
Single Storey Extension near South Somerset£62£270
Single Storey Extension near Bournemouth£38£257
Single Storey Extension near Taunton£31£242
Single Storey Extension near Salisbury£35£247
Single Storey Extension near Bridgwater£30£236

Estimates for common extension builder jobs in DT1;

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.

Underpin a building

Underpin a building - £17,407

Two storey extension

Two storey extension - £87,861

Build a timber frame extension

Build a timber frame extension - £25,907

Build a swimming pool

Build a swimming pool - £80,907

Single storey extension

Single storey extension - £53,144

Side return extension

Side return extension - £40,456

Install an RSJ

Install an RSJ - £2,107

Outbuilding

Outbuilding - £9,907

Build a Mansard loft conversion

Build a Mansard loft conversion - £51,907

Loft conversion

Loft conversion - £32,880

Build a kitchen extension

Build a kitchen extension - £41,907

Hip to gable loft conversion

Hip to gable loft conversion - £41,907

Granny annexe

Granny annexe - £86,907

Garden office

Garden office - £9,907

Convert a Garage

Convert a Garage - £15,907

Garage

Garage - £18,407

Build a flat roof extension

Build a flat roof extension - £21,907

Build a dormer loft conversion

Build a dormer loft conversion - £41,907

Concrete foundations

Concrete foundations - £6,157

Convert a bungalow loft

Convert a bungalow loft - £28,907

Convert a basement

Convert a basement - £36,456

More extensions & conversions cost guides...