Peter, An SWPPP is required when construction disturbs 1 acre are more. Since this was an interior remodel, an SWPPP would not be required. If you have any additional questions, please let me know. Thanks, Clay Barnett, P.E. Town Engineer Town of Addison 16801 Westgrove Drive Addison, TX 75001-2818 Office: (972) 450-2857