Which document to be reffered for maintaince calcluation of a house?

Living in a gated community requires you to regularly pay a maintenance cost.

This cost calculation happens according to the size of the house, villa or apartment.

Hence, prices are calculated per square foot. Maintenance costs cover the maintenance of amenities and common facilities in the community.

This includes the community roads, gardens, lifts, garbage collection, clubhouse and more. Hence, the maintenance costs will be the total of your home size, amenities offered, including security services and the locality you live in.

More upscale localities imply more maintenance costs.

General maintenance costs 

1. Service charges: Security, garbage collection, parks & garden maintenance, swimming pool, play areas, etc., charges.
2. Maintenance of lifts: For smooth operation of lifts, they must undergo checks and maintenance by the relevant company experts.
3. Water charges: External water tankers when there is a shortage of borewell water or municipal water.
4. Electricity charges: All common area lighting charges are included.

Thanks , but that is not my question . My question is which is the legally accepted document for calculating the maintaince / Sq feet . We have 3 in question 

1) COnstruction agreement 

2) Khata issued by Govt bodies 

3) Builidng Approved Plan .

All of them are diffrent due to deviations 

Every flat owner must get occupancy certificate.Accordingly the rate & area will decide.

Builder is not giving Ocuppancy certificate - thats another issue , in which case what must be taken in as a refernce document to freeze the Sq feet of the house for maintance.