Prime Oak Garden Rooms & other buildings Prime Oak offer a completely bespoke service but can also manufacture effectively ‘standard’ buildings from joinery components. The three sketches below are all drawn at 4.79m x 5.19m and are based on our standard joinery range. We can provide a guide price based on your size requirements but to produce a quotation we need further information such as site access and ground levels. ©  Web by APK Garden Rooms A Prime Oak garden room attached to your property can be designed to suit the existing structure. A Garden Room roof can be tiled with clay tiles, slates, pantiles or even thatch. Orangeries Originally used as a place where citrus trees were wintered, orangeries have now been brought into the 21st Century with solid roofs where temperature can be regulated all year round. A Prime Oak orangery characterised by either a flat leaded roof or part tiled, with or without a Lantern to provide extra light will add a classic architectural addition to your home. Conservatories Identical structure to garden rooms & orangeries but with a glazed roof. All Prime Oak buildings benefit from toughened double glazed units