Box, Bay and Greenhouse windows are all effective in capturing views. They bring sunlight into a room and box windows are perfect window seat space. Greenhouse windows are paricularly effective in kitchens. And all of these windows are useful at making a room appear bigger. Box windows are often light-maximising corner windows. With Bay windows, the whole unit projects from the exterior wall. Greenhouse windows maximise light and warmth. They have glass roofs and 90 degree corners.