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.
A recess still projects into the room, but all sides are even. Think of a recess as a box for your window.
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.
If you have a window sill and unsure hot to measure, see our Help Article on How to Measure.
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