Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what inspection regime was in place for verifying the quality and compliance of heat pump installations funded under the Domestic Renewable Heat Incentive and the Green Homes Grant Voucher Scheme; how many installations were physically inspected; and what steps his Department is taking to ensure that future government-funded installations are subject to independent on-site verification.

Installers participating in government clean heat schemes, including the Domestic Renewable Heat Incentive (DRHI) and Green Homes Grant Voucher Scheme (GHGVS), must be Microgeneration Certification Scheme (MCS) certified. MCS is responsible for setting and upholding technical standards for small scale renewable technologies, and accredited installers are subject to annual audits and site‑based assessments.

Annually for the DRHI, approximately 400 randomly selected, and up to 250 risk-based site audits occur.

GHGVS installers required suitable TrustMark qualifications. TrustMark conducts site audits, but the department does not hold statistics on this.