There are two types of audits on the Domestic RHI - desk audit and site audit. Below you will find what they consist of, and what is required of you.

Desk Audit

As part of our scheme compliance checks, a certain number of applications for accreditation to the scheme will be automatically subject to a desk audit. In these cases, we may need you to provide additional information as assurance that the heating system is eligible and that the application is otherwise compliant with scheme rules.

Also, a number of properties and plants will be subject to a desk audit after accreditation, as part of our regular compliance checks.

Some domestic plants and properties may also be subject to a desk audit where we have indications of fraud.

You may also be asked to provide further evidence of your compliance with the scheme rules, for example:

  • MCS certificate and MCS Compliance Certificate,
  • photographic evidence relating to the renewable heating system and/or meter(s),
  • copies of utility bills, council tax bills, tenancy agreements (for landlords),
  • copies of correspondence relating to Grantsopen key term pop-up,
  • a copy of the Installer Metering Questions (IMQs) for biomass or heat pumps if applicable,
  • proof of purchase and installation (eg invoices or receipts),
  • Biomass sustainability and the Biomass Suppliers List (BSL)open key term pop-up approved fuel receipts for all fuel which is solid biomass used in a scheme accredited heating system on or after 5th October 2015,
  • Standard and/or alternative metering schematic drawing,
  • solar thermal domestic hot water calculations,
  • title deeds, TR1 forms, fixtures and fittings or evidence of property ownership,
  • copies of relevant bank statement and ID documents.

This list is not exhaustive. We may ask for other evidence as necessary as part of the audit.

Please note that, even though you may have submitted some of these details above during the application stage, you will still be required to comply with the audit request and provide copies of these.

The Audit and Counter Fraud team have the authority to suspend your payments if you do not comply with your ongoing obligations. For more details, you can read about your ongoing obligations on our website.

Site Audit

We will select a number of sites for inspection by us or a third party on our behalf. During this visit, information about the accredited plant and property will be collected in order to verify the eligibility of the renewable heating system and to check overall compliance with the scheme rules.

A site audit is a physical inspection of the renewable heating system, at your property. We will need to inspect the renewable heating system, supporting infrastructure, and any buildings that may be connected to your plant.

Access requirements for site visits

If you’re a member of the scheme you will be required to comply with an ongoing obligation to permit us access to the domestic property for the purposes of inspecting your heating system.

If you own a renewable heating system but do not live in the property (eg landlords or Registered Social Landlords), it’s your responsibility to make sure that all of your tenants of the property/ies have agreed to permit us or our site auditors access to your property.  It’s an ongoing obligation under the scheme rules that you have that agreement.

If the auditor is not permitted access to the property (and the reason for refusal wasn’t sufficient), or isn’t permitted to investigate fully, this will be treated as a non-compliance. The Audit and Counter-Fraud team have the authority to suspend your payments if you don’t comply with your ongoing obligations.

If a site audit is required, we’ll provide you with a notice of an inspection a reasonable amount of time before the audit takes place. We generally expect the audit to be carried out within 28 days from receipt of the notice, at a reasonable time for you or your tenants. Site audits are usually carried out during business hours – 9:00 to 17:00 on weekdays.

In exceptional cases, advance notice may not be provided. All site auditors will carry identification, and a phone number will be provided which can be called to verify the identity of the auditor.

For more details, you can read about your ongoing obligations on our website.


Only grants that relate to the purchase or installation of your heating system are relevant to the Domestic RHI. Any public grant funding will be deducted from your Domestic RHI payments. More.

Biomass sustainability and the Biomass Suppliers List (BSL)

Sustainability criteria for the Renewable Heat Incentive (RHI) were introduced on 5 October 2015 for all installations using biomass fuels. More.