Build a single storey extension in Blackheath from £52,760

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Single storey extension cost in Blackheath

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J&J Building Solutions

From £55,960

(rates verified 18/09/26)

Location

Streatham, SW16

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in Blackheath. No obligation free ...

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Mr

From £56,920

(last active 26/09/26)

Location

Harlesden London, NW10

Experienced extension builder ready to quote for your work. Mr is the best extension builder in Blackheath. No obligation free quotes and many happ...

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JK Doors

From £54,680

(last active 26/09/26)

Location

Fitzrovia, W1W

JK Doors is a trusted extension builder serving customers in Blackheath and the surrounding area. Contact us to today to get a competitive quote fo...

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Torrington

From £58,840

(last active 26/09/26)

Location

Shoreditch london, EC2A

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

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Samuele Paolini

From £62,840

(last active 26/09/26)

Location

Cricklewood, NW2

Need an Extension Builder in Blackheath? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for m...

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Guven Buildings LTD

From £61,240

(last active 26/09/26)

Location

Chigwell, IG7

skilled worker who specializes in completing a wide range of building and renovation projects

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HOUSE BUILDING SERVICES LIMITED

From £67,320

(last active 25/09/26)

Location

Welling, DA16

HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in Blackheath and the surrounding area. Contact us to today to get...

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GR MAINTENANCE LTD

From £52,760

Member since April 2025

Location

Barking, IG11

Trusted and professional extension builder in Blackheath. Experienced in all extension buildering work and keeping within budget and on quote. GR M...

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T M Builder

From £61,240

(last active 24/09/26)

Location

Yeading, UB4

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

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Derryard Construction Ltd

From £59,000

(last active 24/09/26)

Location

East Ham, E6

Relax... you have found a reliable extension builder in Blackheath. Derryard Construction Ltd is a friendly and reliable company based in Blackheat...

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

Estimates for single storey extension near Blackheath

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Estimates for common extension builder jobs in Blackheath;

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 - £17,704

Two storey extension

Two storey extension - £88,306

Build a timber frame extension

Build a timber frame extension - £26,204

Build a swimming pool

Build a swimming pool - £81,204

Single storey extension

Single storey extension - £59,080

Side return extension

Side return extension - £43,795

Install an RSJ

Install an RSJ - £2,404

Outbuilding

Outbuilding - £10,204

Build a Mansard loft conversion

Build a Mansard loft conversion - £52,204

Loft conversion

Loft conversion - £35,663

Build a kitchen extension

Build a kitchen extension - £42,204

Hip to gable loft conversion

Hip to gable loft conversion - £42,204

Granny annexe

Granny annexe - £87,204

Garden office

Garden office - £10,204

Convert a Garage

Convert a Garage - £16,204

Garage

Garage - £18,704

Build a flat roof extension

Build a flat roof extension - £22,204

Build a dormer loft conversion

Build a dormer loft conversion - £42,204

Concrete foundations

Concrete foundations - £6,454

Convert a bungalow loft

Convert a bungalow loft - £29,204

Convert a basement

Convert a basement - £39,795

More extensions & conversions cost guides...