Adjust window head height to see how far daylight penetrates the floor plan
Window Head Height
9.0ft
7 ft — low head12 ft — high head
Daylit Depth
22.5 ft
% Floor Daylit
90%
✓ Well-Daylit
The 2.5× Rule: The primary daylit zone extends from the window wall to a depth equal to 2.5 times the window head height. Room: 25 ft deep × 14 ft ceiling × 3.5 ft sill. Well-daylit threshold: ≥ 75 % of floor area.