MCS certification: what it covers and why so much depends on it
By the Offrano editorial team · · 4 min read
Three letters appear in almost every conversation about heat pumps, solar panels and home batteries: MCS. The Microgeneration Certification Scheme sets standards for small-scale renewable products and for how they are designed and installed. Whether a grant is paid, whether a supplier will pay for exported electricity and whether a planning exemption applies can all hinge on it. This guide explains what MCS is, what the certificate at the end of a job proves, and where its protection stops.
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Two roles: standards and consumer protection
MCS describes itself as the UK's quality mark for small-scale renewable energy systems such as solar PV, solar heating, heat pumps, biomass and battery storage. It has two main roles. Its product standards set requirements for performance, testing and documentation of certified products. Its installation standards define how a certified installer should design and install a system, including the requirement to use certified products.
The second role is consumer protection. Certified installers must meet MCS consumer protection requirements from the first enquiry to the final installation, and MCS offers a route to resolve complaints when things go wrong.
Source: mcscertified.com
Where certification is a condition
The Boiler Upgrade Scheme in England and Wales only works through an MCS certified installer: you ask such installers for quotes, and the installer applies for the grant on your behalf. Since changes in April 2026, MCS is the sole certification scheme accepted for the grant. Home Energy Scotland also requires an MCS installer and a certified product for renewable systems it funds.
Export payments work in a similar way. Suppliers offering Smart Export Guarantee tariffs require suitable certification for installations up to 50 kW, which for solar PV normally means an MCS certificate. And in England, an air source heat pump is only permitted development if it complies with the MCS planning standard for noise.
- Boiler Upgrade Scheme: MCS certified installer required
- Home Energy Scotland renewables: MCS installer and certified product
- Smart Export Guarantee: certification of installation and installer
- Permitted development for air source heat pumps in England: MCS 020(a) compliance
Source: gov.uk · homeenergyscotland.org · legislation.gov.uk · gov.uk
The certificate at the end of the job
When an MCS certified installer completes an installation, it registers the installation and you receive an MCS certificate. Keep it with your property documents. You need it to apply for export payments, the grant process relies on it, and a buyer's solicitor may ask for it when you sell. If you have not received a certificate after installation, contact the installer first and then MCS.
The certificate also records key details of the system, which helps if a different engineer services or repairs it later.
If an installation is later found not to meet MCS standards, the certificate is the starting point for any complaint. MCS asks consumers to raise problems with the installer first and to contact MCS if that does not resolve them, so keep the paperwork, the quote and any correspondence together.
What MCS does not do
Certification says an installer has shown it can work to MCS standards and has agreed to its consumer protection requirements. It is not a guarantee that every installation is perfect, it does not set prices, and it does not replace other registrations. Gas work still needs a Gas Safe registered engineer, electrical work still has to meet the Building Regulations, and refrigerant handling for heat pumps requires F-gas qualifications.
It also does not make a quote comparable on its own. Two MCS certified installers can propose different sizes, different radiators and very different prices for the same house. Ask each to show the heat loss calculation or generation estimate behind its proposal.
Source: hse.gov.uk · gov.uk
Checking an installer
Use MCS's own 'Find an Installer' search rather than a logo on a van or a website. Check that the certification covers the technology you want, since installers are certified per technology. For a heat pump with a new cylinder or radiators, also check who does the plumbing and electrics, and under which registrations.
MCS publishes scam warnings for consumers. Be cautious about cold callers who claim a grant is 'already approved' or ask for large deposits before a survey.
Source: mcscertified.com
Getting a quote through Offrano
Offrano passes your request to exactly one business that buys it. We check that buyers are registered businesses, but we do not verify MCS certification, so check it yourself using MCS's search before you sign. We email you the business's name, address and phone number before it receives your contact details, and the service is free for you.