upheld that amounts to . added 4.2% common area (club expansion) and demanded extra ₹3.8 L from 240 buyers. Tribunal directed: (1) refund with 12% interest if buyer opts out, (2) ₹25 L penalty on builder, (3) compliance audit. Lesson: RERA carpet area is sacrosanct; any structural change needs prior written consent of 2/3 allottees. We provide sample consent letter & refusal template. Keywords: RERA carpet breach, builder penalty, buyer refund.