[header] How to install a bay window [title] Remove enough siding from the wall around the rough opening to reveal the building wrap underneath. [step] Uninstall any existing window from the wall. [title] Make sure the studs and header around the rough opening are safe and can support the bay window.
[step] Prepare the sill for the bay window as directed by the window's manufacturer, such as by adding a drain mat. [title] Drill evenly spaced pilot holes around the bay window's inside perimeter.