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Installing windows in an existing opening is a fairly straightforward practice.

First, consider the structural load of the relocated windows, and then consider wall cavity utilities such as wiring or plumbing. Also factor the working direction to cut down on dust inundation caused by the breeze that occurs when you create an opening in a wall.

To get started, support the load while you’re working, and begin demolition. Then frame in for the new window to be located in the existing wall. Measure, cut, and install the king studs first, and secure with nails or screws.

Then install the header between the king studs, followed by the header support studs. Now secure everything together. Measure, cut, and install cripples and two sill plates too. Securing the exterior sheathing can be done with screws, but if no access is available through the siding, I sometimes like to use construction adhesive to help secure everything together. It will make the substrate solid with the studs once it's dry.

Now that the framing is done, the sheathing or drywall can be cut to exactly the rough opening size using a Sawzall and a long blade.

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