Generally, sidelites are offered with or without glass and are available in sizes from 12 inches in width to 36 inches in width in 2-inch increments.

Some entry door manufacturers offer custom sizes at additional charge.

Mullion between a door and a sidelite can, sometimes, be custom-adjusted as well. When designing a door with the sidelites, the starting point should be, the entry door. You should decide first on the design of the entry door and make decision what material and texture will be chosen for your door, as well as decorative glass option should be discussed. Once you chose the style and color of the main door, you should check what glass options would go well with your main entry door for the overall aesthetically pleasing door system. Most homeowners in choose some type of decorative or privacy glass in the sidelites to enhance the beauty of the door and create that grand entrance to the home.

Because of the dominating white trim theme on the homes in Connecticut and New England in general, white exterior brickmould (trim) and mullions (connecting points between a door and a sidelite) in white color are the prevailing choice of many homeowners in our part of the country. White color nicely breaks down entire door into separate segments. However, there is a growing trend among Connecticut door companies to offer entry door with sidelites in one uniform color in order to create uniform, elegant design.
Read more at https://www.sevensunwindows.com/why

Doors with Sidelites – Connecticut