Economy Real Estate Myth #3: Higher FSI is the solution to affordable housing Updated : June 05, 2019 12:48 PM IST Additional FSI generally does not come free to the developer as approving authorities charge a premium on it. In areas where approving authorities disallow sale of car parks, basement becomes a big cost burden for the developer. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.