The term ‘Composite' is used to refer to something which is made up of different parts i.e. in this case composite windows and doors that are made up from more than one material. Get the best of both worlds with Bayfield's timber and aluminium composite windows. An ideal solution for replacement windows and new build/extension projects, the warmth and beauty of timber provides a natural and traditional appearance for the inside whilst the aluminium offers a contemporary finish for the exterior and a surface that is durable, storm-proof and maintenance-free.