Installing a windowsill involves measuring the window opening, cutting the sill to fit, and attaching it with screws or adhesive. Make sure the sill is level before securing it. Seal the edges with caulk to prevent moisture damage and ensure a tight fit. Once installed, paint or stain the sill to match the rest of the window trim.

Windowsill installation requires accurate measurements, leveling, and secure attachment. Caulking the edges prevents water damage and ensures a professional finish. Painting or staining the sill provides the finishing touch, blending it with the rest of the window frame.