NWA Group manufacture aluminium window cills in an extensive range of sizes and bespoke profiles to suit any window system. Available up to 4 metre long with a range of features. Aluminium Cills can be retro-fitted to existing window cills making them the ideal choice for external insulation contractors, or can be used on new building projects. Our cills are suitable to use on both domestic and commercial buildings and come with a powder coated finish in a wide range of RAL colours to suit your individual requirements. Aluminium cills are ideally suited to contemporary new dwellings including passive houses which help improve your house efficiency. Window cills are an integral part of any passive house. The main purpose of a cill is to cast water away from the fabric of the building and to prevent water ingress. Suitable for use on – ICF, Timber Frame, Block/brick build, External insulation projects.