FAR (Floor Area Ratio)

FAR (also called FSI — Floor Space Index, or Plot Ratio) is calculated as: Total Floor Area / Plot Area. In Dhaka, RAJUK controls FAR through the DAP (Detailed Area Plan) and Building Construction Rules. Typical allowable FAR in Dhaka: residential 3.0-5.0, commercial 6.0-8.0, depending on road width, zone, and plot size. FAR calculation typically excludes: basement parking, ground floor parking (if open), stairwells, lift shafts, and utility rooms up to certain limits. Exceeding allowable FAR is one of the most common building violations in Dhaka. FAR violations cannot be rectified after construction — the building permanently exceeds its legal density. Some jurisdictions allow additional FAR through transfer of development rights (TDR) or premium FAR purchase.

FAR violations indicate illegal construction and create significant legal risk including demolition orders. For due diligence, comparing actual built area against approved FAR is a fundamental check. Excess FAR also means inadequate parking, reduced setbacks, and higher fire risk due to density.