Hi
Since it is a construction industry, The Assam Shops and Establishment Act 1971 is applicable to this organisation. So you should check following things:
1. 3 days compulsory leave for celebrating religious function section 11 (9),
2. As per the section 13 (1) of the said Act, 13 PL with full wages is mandatory for all the employees who completes 1 years (240 days) continuous service. This PL cannot be clubbed with above mentioned holidays, weekly off and any other holidays. It can be accumulated for maximum 30 days in next year and whatever is left, you need to pay for it.
3. As per the section 1392) you also need to give 12 days medical leave or sick leave with pay for the employees who completes 1 years of service.
It can be given onn the ground of any sickness incurred or accident sustained by him and to casual leave with wages for a period not exceeding twelve days on any reasonable ground. It is not encashable so end of the year it gets lapse.
Whatever you have planned is fine, you can modify it as per the mutual benefit and which can create a win win situation for employer and employee, you just need to comply with above sections.
I hope I have cleared your doubt