Jamb extensions are an interior window feature that allows your frame to fit window openings of varying depths. By extending the window jambs to the precise length required, your window is able to sit flush with your interior wall. If you have a window frame that isn’t quite as deep as your wall opening, jamb extensions can be used to make it fit. Jamb extensions are available in vinyl as well as wood, so you can match the hardware floors, cabinets and other furniture in your home. FAQ Friday is a weekly feature where we answer Frequently Asked Questions about our products, service or industry. To see other FAQs we’ve answered, visit our FAQ page. If you have a question you don’t see an answer for, just ask in a comment or contact us.