Enlarging a window, particularly making it wider, requires major remodelling work to the bedroom. The project requires removing much of the wall sheathing or drywall on the interior of the room. For this reason, increasing a window size is commonly only attempted as part of a major room remodel, while replacing a window with the same or smaller size is a less ambitious project.
The project starts with a little demolition. Remove the window trim and the drywall above and below the existing window. Also, remove drywall on each side of the existing window opening to the next stud on each side of the window. Measure to make sure the opening from one full wall stud to the other is wide enough to accommodate the new planned window. Salvage insulation for future use, although most other materials are scrap.
Removing the Window and Frame
Part of the wall stud assembly forms a frame around the window. This includes a header above the window. The header consists of multiple pieces of lumber nailed together to form a beam that supports the weight of the house above the window. Remove the window and the stud frame around it, including the header. Cut the studs loose from the floor and ceiling with a reciprocating saw and pry the frame loose.
Build a New Frame
Build a new frame to accommodate the new window size. This includes placing a header at the top of the planned window opening that connects the two outside studs identified in the Get Started paragraph. When completed, the framework for the new window exists in the wall studs complete with a header across the top. Cut the exterior siding and wall sheathing to accommodate the larger window opening with the reciprocating saw.
Finish the Job
Install the new window in the opening. Sheath the interior wall with drywall after replacing the wall insulation. Tape and texture the drywall before adding interior window trim and painting.
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