Internal cills – also known as those ledges at the bottom of your windows – have a dual function: first of all, their purpose is to make your windows more energy efficient, by keeping cold out and the heat in. As well as finishing off the window structurally, they can also be a wonderfully distinctive decorative feature.
Although you can buy them in a variety of materials, internal cills are often made from wood. We think natural stone is a fantastic choice. Not only does it add character to a room, stone is an excellent substitute for timber: it’s hardwearing, light in colour and non-perishable.