barnconversioncost.co.uk

Borehole water supply cost

Build-cost bands are the site's own indicative model, inflated to a Q2 2026 footing via the ONS Construction Output Price Index (April 2026). Class Q rules current to the 21 May 2024 GPDO amendment.

A domestic borehole for a rural barn typically costs £8,000 to £14,000 installed, including the borehole drill, pump, UV treatment and softener. The Private Water Supplies Regulations risk assessment is a £350-£800 local-authority charge.

Cost stack

Borehole drill (60-90 m, typical)
£3,500 - £6,500
Submersible pump and headworks
£1,400 - £2,800
UV treatment
£600 - £1,200
Softener and pressure vessel
£900 - £1,800
LA risk assessment (one-off)
£350 - £800
Annual water sample
£90 - £180

Regulatory

Private supplies serving a domestic dwelling are regulated under the Private Water Supplies Regulations and overseen by the local authority. A Regulation 9 risk assessment runs every five years. Sample frequency depends on the LA risk score.

Sources cited on this page
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Reviewed for build by O. Wakefield-Smith, Digital Signet research, Q2 2026. A chartered surveyor (RICS MRICS) sign-off is being procured for the live site. Statutory and tax figures bracket their published ONS, gov.uk or HMRC source on the page where they appear; the £/m² build-cost bands are the site's own indicative model, not a published dataset.