Zamil O&M has been classified by the Ministry of Municipal and Rural Affairs, Government of Saudi Arabia, for the following services:
| # | Domain | Class |
|---|---|---|
| 1 | Operations & Maintenance of Water and Sewage facilities | 1 |
| 2 | Building Maintenance | 2 |
| 3 | Maintenance of Medical Centers | 2 |
| 4 | Catering and Housing of Companies and Persons | 2 |
| 5 | Operations & Maintenance of Electrical | 4 |
| 6 | Operations & Maintenance of Mechanical | 3 |
| 7 | Operations & Maintenance of Electronic | 5 |
| 8 | Operations & Maintenance of Marine Work | 5 |
| 9 | Landscaping | 5 |
| 10 | Road Maintenance | 5 |
| 11 | Cleaning Work of Cities and Disposing Garbage | 5 |