RES are TrustMark certified. TrustMark is the Government Endorsed Quality Scheme covering work a consumer chooses to have carried out in or around their home.
When a consumer uses a TrustMark Registered Business, they know they are engaging an organisation that has been thoroughly vetted to meet required standards and has made a considerable commitment to good customer service, technical competence and trading practices.
By ensuring all Registered Business adhere to and maintain these standards through our expert network of Scheme Providers, TrustMark gives consumers increased confidence and choice. Additionally, in the event that a problem does arise, TrustMark offers a range of remedies to give further protection to consumers. (source: https://www.trustmark.org.uk/aboutus/what-is-trustmark)