A Sill Horn is the extension of the sill to the exterior of the brickmould or casing. This is a decorative choice and is common in colonial and authentic classic trim packages.
![](https://learn.reeb.com/wp-content/uploads/2019/03/kba-sillhorn-1.jpg)
Sills with a metal saddle will use a sill extender to create the sill horn.
![](https://learn.reeb.com/wp-content/uploads/2019/03/kb-exterior-metalsillhorn.jpg)
Wood sills will use a longer sill and create the horn by cutting the sill. It is important to specify the length of the horn when ordering the unit.
![](https://learn.reeb.com/wp-content/uploads/2019/03/kb-exterior-woodsillhorn.jpg)
While the horn can be cut to match the outside of the casing, if no casing is selected specifying the horn length is mandatory.
![](https://learn.reeb.com/wp-content/uploads/2019/03/kb-exterior-sillhornunit.jpg)