Cast stone window sills (or cills) are available to order from Kobocrete. We supply an extensive range of stone window sills now available to order online through our website. There are eleven styles of stone window sill to choose from offering contemporary and classic designs which are all hand made in the UK by our carefully selected manufacturing partners. We offer many colour options for our stone products. All our stone window sills are manufactured to order ensuring the highest quality standards are achieved.