Window Casing & Sills

Most production homes finish windows with a drywall return — the sheetrock simply wraps into the frame and there is no wood at all. It is fast and cheap, and it makes an expensive window look like a hole in the wall.

Removing the wrap

Trimming out a wrapped window is not a matter of nailing casing over the top. The drywall return has to come off first, back to the window frame, so the jamb extension can sit on something solid and the casing can hold a proper reveal. Skipping that step is how you end up with trim floating on a bed of caulk.

Jamb extensions, scribed

Openings are rarely the depth the trim assumes, and they are almost never plumb. Each extension gets ripped to that specific opening’s depth, then scribed so it lands flush with the finished drywall plane rather than proud or recessed. On a window that is out of plumb, the extension absorbs the variation — the casing stays true.

Stool and apron

A traditional stool is the interior sill: hardwood, horned past the casing on both sides, with an apron beneath it. That single change does more for a room than almost any other trim work, because it gives the window a base to sit on instead of dying into the wall. Where the architecture calls for it instead, four-sided picture-frame casing keeps the opening clean and symmetrical.

Treating a room as one set

Windows are rarely alone. When a room has three or five openings, the casings have to agree with each other — same reveal, same stool projection, same horn length, and aligned heads even when the rough openings are not.

We measure the whole elevation before cutting, establish a common head line, and shim each extension to it. Framing routinely varies half an inch across a wall. Nobody notices that on a drywall return; everybody notices it once there are five casings meant to line up.