Here in Double L we have a wide range of Concrete window sills. The Concrete Stooled Sill T-Frame - 225x140  is made to suit a timber-frame work construction with brickwork walls.  The window sills are made to order and lead time generally is between 3 and 10 working days depending on the size of the order. If this isn't the right fit for you, please check the rest of are options as we have variety of widths to suits your needs.