What is a Sill?

At step 3 of the Design Centre, we will ask if you have a protruding window sill. It's important to understand the difference between a sill and a recess so that you select the appropriate frame for your window.

A window sill projects into the room further than any other side of your window.

sill yes

A recess still projects into the room, but all sides are even. Think of a recess as a box for your window.

recess gif


A window may have a recess and a sill. If you're unsure, look at your window from the side. Does the bottom of your recess stick out further than the top? If the answer is yes, you have a sill.

Why do we ask the question? If you do have a sill, we'll provide a frame with a sill bottom. For example, a regular Z-frame won't be able to wrap around the bottom of your recess if there is a sill in the way. So the bottom of your frame will be designed to sit on top of your window sill.

Corner Piece9

If you have a window sill and unsure hot to measure, see our Help Article on How to Measure.


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Gilad Baker
By: Gilad Baker Published: 19 Jun 2018