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Urban Redevelopment Authority (URA)

Curtain Wall

Find out the GFA treatment for curtain walls

Last updated 6 June 2026

For buildings with curtain walls fixed onto the main structure, the GFA is measured up to the middle of the outermost vertical facade element (e.g. the glass panel).

Cross-section diagram with labels: mullion, glass, floor slab. Indicates Gross Floor Area (GFA) is measured to half the glass thickness.

Curtain Wall (Section)

Diagram showing the cross-section of a curved glass surface.

Curtain Wall (Plan View)