Engineer Owned Operator Firms Guidelines for Constructors/Operators Category – O3 Application Form: Engr. Owned, New Registration, O3 Application Form: Engr. Owned, Renewal (without any change in previous license), O3 Application Form: Engr. Owned, Renewal (with change), Up-gradation (any category), Misc, O3 Category – O4 Application Form: Engr. Owned, New Registration, O4 Application Form: Engr. Owned, Renewal (without any change in previous license), O4 Application Form: Engr. Owned, Renewal (with change), Up-gradation (any category), Misc, O4 Category – O5 Application Form: Engr. Owned, New Registration, O5 Application Form: Engr. Owned, Renewal (without any change in previous license), O5 Application Form: Engr. Owned, Renewal (with change), Up-gradation (any category), Misc, O5 Category – O6 Application Form: Engr. Owned, New Registration, O6 Application Form: Engr. Owned, Renewal (without any change in previous license), O6 Application Form: Engr. Owned, Renewal (with change), Up-gradation (any category), Misc, O6