To check whether a plot is CMDA approved or not you can visit the official website of the Chennai Metropolitan Development Authority and search for the property or real estate project in their database, which will list all CMDA-approved plots in Thirumazhisai for your perusal. Another way is to physically visit the CMDA office and inquire about the project’s approval status. You can also ask the developer for the necessary documents, such as the layout plan, building plan, and authority approvals.