
An apron is the horizontal timber board fixed directly beneath a window sill on the interior, often used to cover the gap between the sill and the wall or plasterwork.
In period homes, it serves both a functional and decorative role-protecting the wall from knocks and moisture while complementing the architrave and skirting for a cohesive finish.
During window restoration, matching the apron’s profile and finish to original features ensures visual continuity and authentic detailing.


