<p>Installations under ECO4 must be carried out by TrustMark registered and Publicly Available Specification (PAS) 2030 or Microgeneration Certification Scheme (MCS) certified businesses, in accordance with PAS 2035. This ensures work is carried out by an installer who has demonstrated an appropriate level of skill and competence and minimises the risk of unintended consequences.</p><p> </p><p>As the only Government endorsed quality scheme, TrustMark registered businesses are thoroughly vetted for technical competence, customer service, and good trading practices. TrustMark registered businesses must also provide an appropriate guarantee and be signed up to a dispute resolution process.</p>