Cost to Build a Single Storey Extension in Harrow

Build a single storey extension in Harrow from £54,040

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

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

Estimates for single storey extension near Harrow

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Estimates for common extension builder jobs in Harrow;

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 - £17,646

Two storey extension

Two storey extension - £88,220

Build a timber frame extension

Build a timber frame extension - £26,146

Build a swimming pool

Build a swimming pool - £81,146

Single storey extension

Single storey extension - £57,928

Side return extension

Side return extension - £43,147

Install an RSJ

Install an RSJ - £2,346

Outbuilding

Outbuilding - £10,146

Build a Mansard loft conversion

Build a Mansard loft conversion - £52,146

Loft conversion

Loft conversion - £35,123

Build a kitchen extension

Build a kitchen extension - £42,146

Hip to gable loft conversion

Hip to gable loft conversion - £42,146

Granny annexe

Granny annexe - £87,146

Garden office

Garden office - £10,146

Convert a Garage

Convert a Garage - £16,146

Garage

Garage - £18,646

Build a flat roof extension

Build a flat roof extension - £22,146

Build a dormer loft conversion

Build a dormer loft conversion - £42,146

Concrete foundations

Concrete foundations - £6,396

Convert a bungalow loft

Convert a bungalow loft - £29,146

Convert a basement

Convert a basement - £39,147

More extensions & conversions cost guides...