How to Replace a Window (with Pictures) – wikiHow

Steps Part 1 Measuring the Dimensions of the Old Window

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Measure the width of existing window. To measure the width of the existing window, go from the jamb on left side of the window to the jamb on the right side of the window. Again, measure across at the top, middle, and bottom, selecting the shortest distance as your true measurement.

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Know that if you buy a window that fits the existing window frame, you won't have to buy a whole new window frame. This is why you measure the existing window before you remove it.

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Take out the inside sash from the window frame. Once the inside stops are gone, this should be a fairly easy procedure. If, however, the inside sash is connected to a weight by a chain, simply cut the connecting chain or chord and let the weight fall down to its well.

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Run a bead of caulk along the inner part of the outside stops on the jambs.

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Center both the inside and the outside sash vertically inside the window frame. Locate the bumper stops and begin to slide them over into the middle of the frame. Do this until four mounting holes in the side jambs become visible.

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Place an expander on top of the window, caulking it (optional). Some people prefer not to work with the expander, also called a header, because it decreases the available space in the window and makes replacing the trim harder. Use at your discretion.

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Place the window in the frame, shimming as necessary. Check to see if the window is plumb and level (using a level, of course).

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Put in the mounting screws in each jamb. There should be four mounting screws, one for the bottom and top of each side jamb. Install them gently, taking care not to deform the paneling on the side jamb.

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Expand the header so that is creates a seal between the top of the window and the old frame.

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Check to see that the windows work properly and don't contain any gaps. If you do notice gaps or faulty motion on the windows, check for any adjustment screws built into the side-jambs, using them to correct the window frame.

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Caulk the inside of the window and reattach the inside stops. Your project is officially done.

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How to Replace a Window (with Pictures) - wikiHow