GEM Windows & Doors specialise in supplying directly to the public and offer standard size windows and doors as a cost saving alternative for aluminium and timber sliding doors, stacking doors, sliding windows, awning windows and double hung windows. We offer impeccable quality and present unbeatable value for both domestic and commercial requirements for small projects and larger scale developments of dwellings under 3 storeys as our products come assembled and pre-glazed. With production being based in Sydney, we can offer competitive lead times of 3-4 weeks for residential windows and doors and 5-6 weeks for commercial windows and doors. With two sizeable showrooms (one in Alexandria, the other in Castle Hill) we have a wide range of aluminium and timber windows and doors on display. We also have a window and door warehouse in Prestons with over a 1000 stock aluminium sliding windows and doors in 4 different colours.