A Model Welfare scheme to provide relief to building and other construction workers was announced by Ministry of Labour and Employment in 2018 

https://labour.gov.in/whatsnew/model-welfare-scheme-building-and-construction-workers-and-action-plan-strengthening (The scheme is in a downloadable format in PDF)

This guideline suggests that:

• All workers in every state should be allotted an Unique Identification Number and to be registered with the Labour department. This will help in delivery as well as portability of the welfare measure.
• Every state will have a “State Building and Other Construction Workers Welfare Board” and that will help CSOs/ individuals to register the workers as beneficiaries of the welfare benefits. For Example, please refer to the Karnataka State Welfare Board Registration Form.
  https://www.karbwwb.com/Registration%20-%20eng.shtml