Custom Sash Sizes

Terminology and General Sizing Information

If you have not read the information about sizing in the FAQ section, please do. It has lots of information.

Transoms Direct's basic product is a window sash -- that is, the wood frame carrier for the glass. To install a sash in the wall, it needs to be mounted in a jamb. We offer two ready-to-install options that include jambs: a plain jamb and an operable transom with jamb. Or, if your prefer, you can also just order the sash and build the jamb yourself.

If you choose either of our jamb options, our standard jamb adds 3/4" to all sides of the transom sash. So, we recommend that the rough opening (that is, the stud to stud hole that the transom fits in) be 2" wider and 2" taller than the sash size ordered. So, order a transom sash that is 2" smaller in width and height than your opening. This will give you 1/2" or so of wiggle room that you can shim with wood wedges to fill the hole.

Transoms vs. Interior Windows

While the terms transom window and interior window are used pretty interchangeably on this site, when it comes to ordering a custom window it is important to note that there are two distinct cases.

We consider a transom to be a window that is 8" to 16" tall. These can be ordered custom directly from our web ordering engine (see below). More than 16" tall we consider an interior window. Interior windows are handled on a one-by-one basis since we will likely have to alter the mullion (i.e., grid) design as the window gets taller. For interior windows, please chat or call so we can discuss your needs in person.

Ordering Custom Transoms

After you choose a transom design (e.g., Traditional TR-1) from the sashes menus on the left menu bar for the site, you can choose a specific, standard model that is a specific size. For example, you could choose the TR-1-2612 model by clicking Traditional… then TR-1... then TR-1-2612.

Once you choose a specific size, you will end up on an Ordering Page. You will know you are on the Ordering Page because it will have an Add to Cart button at the bottom.

Once on the Ordering Page, you may alter the standard transom to your own custom transom size.

Please Note: If you are going to place the transom over a door, one of our standard models is likely the to be right size (since they are designed to match-up to common door sizes). In this case, be sure to read our FAQ carefully before altering transom size.

Custom Heights (8" to 20")

If the Ordering Page is for a…Then you will be able to order..
12" tall transomHeights from 8-1/2" to 12" in 1/2" increments.
16" tall transomHeights from 12-1/2" to 16" in 1/2" increments.

Custom Widths (20" to 72")

If the Ordering Page is for a…Then you will be able to order..
24" wide transomWidths from 20" to 24" in 1/2" increments.
28" wide transomWidths from 24-1/2" to 28" in 1/2" increments.
30" wide transomWidths from 28-1/2" to 30" in 1/2" increments.
36" wide transomWidths from 30-1/2" to 36" in 1/2" increments.
48" wide transomWidths from 36-1/2" to 48" in 1/2" increments.
56" wide transomWidths from 48-1/2" to 56" in 1/2" increments.
60" wide transomWidths from 56-1/2" to 60" in 1/2" increments.
64" wide transomWidths from 60-1/2" to 64" in 1/2" increments.
72" wide transomWidths from 64-1/2" to 72" in 1/2" increments.

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