Home Improvement Ideas Windows Window Repairs & How-To How to Frame a Window Opening Need to install a new window? We'll show you how. By Caitlin Sole Caitlin Sole Caitlin Sole is the senior home editor at BHG. She is a writer and editor with nearly a decade of interior design expertise. She has vast experience with digital media, including SEO, photo shoot production, video production, eCommerce content, print collaboration, and custom sales content. Learn about BHG's Editorial Process Updated on September 11, 2023 Trending Videos Close this video player Photo: Nathan Schroder Project Overview Total Time: 1 day Skill Level: Intermediate Many steps are involved in learning how to frame a window, so our guide will walk you through them from start to finish. To begin, it's important to know that when framing a window in a new location, it's usually easiest to cut an opening in the interior drywall that's 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 challenging. It's 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 the siding. However, if you're replacing it 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 must cut back the siding to accommodate it. Hire a professional mason to cut an opening if you have a brick wall. 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 whole day on this project—you'll need to remove interior drywall and create the frame. Though it looks daunting, this project is pretty simple. We recommend DIYers learning how to frame a window opening have experience measuring, marking, and cutting before attempting to frame. Everything You Need to Know About Window Materials What You'll Need Equipment / Tools Measuring tape Stud finder Hammer Nail set Flat pry bar Drill with screwdriver bit Level Combination square Framing square Reciprocating saw Handsaw Stapler Materials 2x4s or 2x6s for framing Shims 16d and 10d nails or 2- and 3-inch deck or wood screws Plywood Staples Instructions How to Frame a Window Opening Better Homes & Gardens Prep Space and Examine Studs Before you begin, place drop cloths on the floor and seal the doorways to prevent dust infiltration. Place a fan in a nearby window and point it outward. Then, examine your studs. In this arrangement, an existing wall stud is used as a king stud on one side, and a 2x2 or 2x4 cleat is attached to the stud on the other side to provide a nailing surface for patching the drywall after the window is installed. (This is easier and stronger than trying to cut the drywall down the middle of a stud and then using half a stud's thickness for the nailing surface.) What You Need to Know About Window Replacement Costs Better Homes & Gardens Place Studs You will need at least one new king stud, which is the same length as the other existing studs. Cut two cripple studs; the sill will rest on their tops. (A jack stud will be fastened above so it and the cripple stud sandwich the sill.) Drive a fastener every 12 inches or so in an alternating pattern. Better Homes & Gardens Install Studs Install a king-and-cripple stud combo by wedging the king stud between the top and bottom plates. If framing a cavity, push the king-and-cripple stud halfway behind the drywall and drive angled 10d nails or 2-inch screws. (Fastening will probably move the studs over slightly, so start with the studs offset by ¼ inch or so.) How to Remove and Replace Old Windows with Common Tools Better Homes & Gardens Mark Stud Placement Mark the bottom (sole) plate to indicate where the king and jack studs will go. The distance between the jack studs is the width of the rough opening. Better Homes & Gardens Mark for the Header Hold a level atop the jack stud and mark across the studs to indicate the bottom of the header. Measure upward to mark where the top of the header will be. Make cutlines about ⅛ inch higher than the measurement. If there is a gap, fill it with shims. Make the bottom cuts (step 7) about ⅛ inch lower than the measurement. Better Homes & Gardens Mark Middle Studs Also mark the middle studs for cutting at the bottom. They should be marked for the needed rough opening dimension plus 1½ inches (for a single bottom plate) or 3 inches (for a double bottom plate). A Step-By-Step Guide to Framing an Interior Wall with Wood Studs Better Homes & Gardens Complete Marking Complete your marking using a square to mark across each stud to ensure a square cut. If you have not already done so, install a temporary support for the wall before you start cutting. Better Homes & Gardens Cut Lines Set the blade of a circular saw to full depth, and check to make sure it is square to the saw's baseplate. Cut a scrap piece to confirm that the blade is cutting square. Wearing ear and eye protection, cut the lines with the circular saw. Better Homes & Gardens Finish Cuts Finish the cuts using a handsaw or a reciprocating saw. Better Homes & Gardens Build the Header To build the header, cut two pieces of 2x6 or 2x8 to the width of the opening plus 3 inches. Cut strips of ½-inch plywood as spacers. Lay the 2xs on top of each other to determine which direction (if any) they "crown" (bend upward in the middle). See that their crowns face the same way. Position a spacer every 8 or 10 inches, lay the second 2x on top, and drive two or three 3-inch screws. Better Homes & Gardens Attach the Header Set the header on the jack studs with the crown facing up. You may have to hammer it into position. Attach the header with 16d nails or 3-inch screws. Better Homes & Gardens Create the Sill Cut one or two pieces to length for the sill. Nail or screw the sill in place. If using two pieces fasten one piece to the top of the cripple studs, then add the second piece. Better Homes & Gardens Check for Square Check the opening for square. As long as the opening is ½ inch wider and taller than the window, it's OK if the opening is ¼ inch or so out of square. As a final check, set the window in the opening and check it for square. Better Homes & Gardens Bore Locator Holes Once you are certain the opening is correct, use a drill equipped with a long ½-inch spade bit to bore locator holes to the outside at each corner. The 9 Best Cordless Drills of 2024, According To Testing Better Homes & Gardens Cut Wall If patching walls will be difficult (as when you have plaster walls), you may choose to slip the new framing in. Cut a section of the finished wall that is the correct size of the opening. Use a reciprocating saw to slice through the studs above and below, taking into account the widths of the header and sill. Better Homes & Gardens Cut Studs Cut through the studs midway and pull them out. Carefully clean out the openings to allow room for the header and the sill. Better Homes & Gardens Slip in Header and Sill Slip the new header into the opening and slide in a jack stud at either end to hold the header up. Slip in the sill as well. Angle-drive screws to hold the framing pieces together.