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Calculate the percentage of glass area relative to floor area.
VELUX Denmark recommends using 3-layer roof windows with a U-value of 1.0 and that the glazed area accounts for 10–20% of the floor area—preferably spread across different sides to ensure good daylight and visual comfort.
Calculated Glazed Area: 2.5 m2
The window glass area is 12.5% of the floor area, within the 10-20% recommended range
Ask Velux Assistant anything about choosing the right window, and it will guide you with expert advice on product selection, sizing, placement, and installation. Get clear explanations of technical solutions and make confident decisions for your project.