A Quick Summary of 1BHK Interior Design Costs 1BHK Design ElementCost Range 1BHK interior design cost (400-600 sq.ft.)From ₹6,00,000 to ₹11,00,000 and onwards Per sq. ft. cost of a 1BHKStarts at ₹1,500 per sq. ft. Plain False Ceiling Gyproc Board₹125 per sq. ft. with electrical looping 8 more rows