GBJ Environmental Systems Limited are certified in the following:

• Gas Safe Register.
• Membership of Federation of Master Builders.
• Quality ISO 9001.
• Occupational Health and Safety OHSAS 18001.
• Contractors Health & Safety Assessment Scheme (CHAS)
• Construction Line.
• Achilles.
• W.I.A.P.S. (Water Industry Approved Plumbers Scheme).