A 15 unit multifamily project is 24,000 square feet. It includes four two-bedroom units (1,100 square feet each), three three-bedroom units (1,450 square feet each), and eight studios (750 square feet each) earns 1 point. This project's total in-unit conditioned floor area of 14,750 square feet.
To calculate the reference home size for the project, determine the reference home size for each unit type. The reference home size for studio apartments is 1,000 square feet; 2 bedroom unit's reference home size is 1,600 square feet; 3 bedroom units it is 2,200 square feet. The reference home size for the building is 21,000 square feet. The example home is 6,250 square feet smaller than the reference home size, which equates to being 29.8% smaller, earning the project 7 points.
8 Studio apartments = 8,000 ft2 (8 x 1,000 ft2)
4 Two bed apartments = 6,400 ft2 (4 x 1,600 ft2)
3 Three bed apartments = 6,600 ft2 (3 x 2,200 ft2)
Total reference home = 21,000 ft2
Total in-unit conditioned floor area = 14,750 ft2
Difference in size = 6,250 ft2 (21,000 - 14,750)
Points are calculated as follows:
6250 ft2 / 21,000 ft2 = 29.8% smaller
29.8% = 7 points