| Certis Group | Central | School | SO | Nil | Jurong East |
| Certis Group | Central | Commercial | SO | SS | Choa Chu Kang |
| Certis Group | Island Wide | - | SO | SO | Punggol |
| Certis Group | West | Depot | SS | SSS | Bukit Batok |
| Certis Group | Central | School | SS | SS | Marsiling |
| Certis Group | Island Wide | - | SO | Nil | Braddell |
| Certis Group | Island Wide | Commercial | SO | Nil | Braddell |
| Certis Group | North | - | SO | Nil | Marsiling |
| Certis Group | Island Wide | - | SSO | SS | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SO | Yishun |
| Certis Group | Island Wide | - | SSO | SS | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SS | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SS | Choa Chu Kang |
| Certis Group | Island Wide | - | SSO | SSO | Marsiling |
| Certis Group | West | Retail | SO | SS | Choa Chu Kang |
| Certis Group | South | Healthcare | SS | SS | Punggol |
| Certis Group | East | Gov Building | SO | SO | Bedok |
| Certis Group | East | Gov Building | SO | SO | Bedok |
| Certis Group | North | - | SO | SO | Yishun |
| Certis Group | Island Wide | - | SSO | SSO | Woodlands |
| Certis Group | Island Wide | - | SSO | SSO | Marsiling |
| Certis Group | North | Commercial | SO | SO | - |
| Chang & Chang Security Management Pte. Ltd. | East | Condominium | SS | SS | Tampines |
| Chang & Chang Security Management Pte. Ltd. | East | Condominium | SS | SS | Tampines |
| Chang & Chang Security Management Pte. Ltd. | East | Condominium | SS | SS | Tampines |
