How to Frame a Window Opening
Need to install a new window? We'll show you how to build a temporary support for the ceiling.
When framing for a window in a new location, it is usually easiest to cut an opening in the interior drywall that is quite a bit larger than the window opening. This will require you to patch the walls afterward, but installing framing—especially the header—inside a wall is difficult.
It is also usually easiest to leave the exterior sheathing and siding in place while you cut the studs and build the framing. This prevents having to replace siding. However if you will be replacing the siding anyway, you can cut a large opening in the exterior at the same time you cut the interior opening. If the window has brick molding or a flange, you will need to cut back the siding to accommodate it.
If you have a brick wall, hire a professional mason to cut an opening. When framing always work carefully to produce a structure that presents a smooth face for the drywall. Install adjoining pieces perfectly flush with each other.
Expect to spend a full day on this project—you'll need to remove interior drywall and create the frame. Though it looks daunting, this project is fairly simple. We recomment DIYers have experience measuring, marking, and cutting before attempting to frame.