Profile: Oakland Windows & Conservatories Ltd. specializes in providing conservatories, orangeries, porches, windows & doors, and roofline & cladding. Windows & doors include casement, tilt & turn, sliding sash & energy efficient windows, entrance, French, patio and bi-fold doors. Casement windows have a hinged sash that swings in or out like a door. They can be either side-hung, top-hung, or occasionally bottom-hung, and may include fixed panels on one or more sides of the sash.