ISO certification follows the same path whether you are a two-person trade business or a national contractor. An accredited body audits your management system against the standard, and if it meets the requirements and you are using it, they issue a certificate.
Keuer Solutions is an independent HSEQ consultancy. ISO certification is issued by JAS-ANZ accredited certification bodies, not by Keuer Solutions. We also run SWMS Aus, an online store selling SWMS and HSEQ template packs for Australian trades.