Here, I will provide you with the applicability of the ESI Act 1948. It seems there is no need to register under the ESI Act. Further, the accountant is not a regular employee as he is performing allotted work and not dedicating his hours wholly to you or the organization. The code of employee may kindly be consulted in the labor act. The electrician and the carpenter are daily wage workers or working on a piecemeal basis depending on the availability of work, so they are not employed in your organization for your work.
Applicability
Under Section 2(12) of the Act, it is applicable to non-seasonal factories employing 10 or more persons.
Under Section 1(5) of the Act, the Scheme has been extended to shops, hotels, restaurants, cinemas including preview theaters, road-motor transport undertakings, and newspaper establishments employing 20 or more persons.
Further, under Section 1(5) of the Act, the Scheme has been extended to private medical and educational institutions employing 20 or more persons in certain States/UTs.
*Note: 14 State Govts./UTs have reduced the threshold limit for coverage of shops and other establishments from 20 to 10 or more persons. Remaining State Governments/UTs are in the process of reducing the same.
Best of luck... You are really appreciated for your concern for the employee.