MCS – Microgeneration Certification Scheme

MCS:2025 is the redeveloped MCS Installer Scheme. It is the updated framework for businesses that want to become and remain MCS-certified.

The redeveloped scheme introduces changes to areas including assessment, installer responsibilities, consumer protection and the relationship between MCS, installers and certification bodies.

Read what MCS:2025 means for installers

MCS certification provides independent evidence that an installer has been assessed against recognised requirements relevant to its work.

It can help build customer confidence and is recognised across important parts of the UK’s renewable and low-carbon market.

The exact requirements that apply will depend on the type of work and any scheme or programme involved.

MCS covers a range of small-scale renewable and low-carbon technologies.

The technologies that British Assessment Bureau can certify will depend on our current certification scope, so speak to our team to confirm the requirements relevant to your business.

To become MCS-certified, your business will need to demonstrate that it meets the requirements relevant to its activities.

This includes appropriate technical competence, effective processes and controls, customer-protection arrangements and evidence that your business can consistently deliver compliant installations.

A certification body such as British Assessment Bureau will assess your organisation against the applicable MCS requirements.

Certification timescales depend on your business, the requirements that apply and how prepared you are for assessment.

Speak to British Assessment Bureau about your organisation and we can explain what to expect from the certification process.

MCS:2025 requires businesses to have appropriate processes and controls that support the consistent delivery of compliant, quality installations.

What is appropriate will depend on the way your organisation operates and the MCS activities you carry out.

As an independent certification body, British Assessment Bureau assesses whether your arrangements meet the relevant requirements but cannot design or implement them for you.

MCS certification is recognised within important parts of the UK renewable and low-carbon market, but requirements differ between schemes.

For example, relevant MCS certification is required for installers carrying out eligible work under the Boiler Upgrade Scheme.

Other schemes may have different certification or eligibility requirements, so always check the current rules for the particular programme you intend to use.

MCS supports the small-scale renewable and low-carbon sector by setting recognised requirements for products and installation businesses.

These requirements are intended to support quality installations and greater confidence in technologies that contribute to the UK’s transition towards lower-carbon heating and energy.

MCS:2025 uses a risk-based approach to ongoing assessment.

The assessment activity that applies to your business can take into account factors including your MCS activities and previous assessment performance, rather than applying exactly the same approach to every installer.

British Assessment Bureau will explain the assessment arrangements that apply to your certification.