Therefore, plastic window sills will perfectly fit under such a window, because they will not have dissonance in the material. They have good thermal conductivity and are quite moisture resistant. In the summer they do not miss direct sunlight. You can also order finishing materials for the design of the windowsill of stone. After all, natural stone is durable and quite resistant to various types of damage. And he will bring a certain highlight to the design of the interior of the room. True, you will have to pay a little more money for it.