2015-2018 IBC Frontage Calculator
- For each segment of exterior wall, enter in the length of the segment and the width of open space in front of that section.
- Only wall segments with open space of 20 feet or greater count towards the frontage increase.
- The sum of the segment lengths (P), should equal the total building perimeter.
- The frontage increase factor, If, is the value you plug in to the allowable area equations.