SKILLS registration in the building services engineering sector is running at more than 80 per cent, according to a survey by the electrical, heating and ventilating major contractors' group.
Directly employed workers showed the highest compliance at 89 per cent with subcontractors coming in at 77 per cent.
More than 13,000 workers were checked for cards issued under the Electrotechnical Certification Scheme or the Engineering Services Skill Card.
Leaders of the group are now pushing for an even higher compliance level and plan to hold audits every six months to check progress.
Chairman Sir Michael Latham said: 'The results of the audit demonstrate the commitment of JMCG members to the highest level of workforce competence and health and safety awareness on sites.'
HVCA director Robert Higgs said: 'Recent reports that on many construction sites cards were simply not being asked for, or were inadequately inspected and policed, were of great concern to our members.
'It is therefore encouraging that this audit should reveal a very high level of card-holding among workers in our member companies and among the subcontractors who play such an important role in the overall supply chain.'