How To Install New Windows On An Existing Frame

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If you have a damaged or deteriorated window, you will surely be researching window replacement options. Various solutions will be available to you, depending on the state of your windows. If your window frames are in good shape, you may replace the window without changing the frames – this is referred to as a pocket window replacement.

Pocket Window Replacement

Pocket window replacement differs from full-frame replacement in a few ways. Rather than removing the window frame as in a full-frame replacement, the pocket window can be installed within the existing frame. Insert window installation is another name for this sort of replacement. Furthermore, by adding indoor blinds, you will improve the appearance of your windows. These are also extremely simple to install, significantly when a professional installer can often place brackets into a window frame, mount a blind, and connect the parts in a couple of moments. 


The old double-hung or single-hung window sashes and external stops should be removed before installing the new window. Pocket replacements enable you to maintain the existing frame, trim, siding, and casing intact. They are widely used by homeowners who wish to replace a worn window with just a new window of the same size, as long as the present window frame is square, level, and in excellent shape. It may also be helpful when the home’s outer material is more affected.

Take Measures


The most crucial stage in the window-replacement process occurs before installation day. It measures the proportions of an existing window frame to ensure that a replacement unit is a correct size. This is how you do it.

Take three measurements from jamb to jamb all across the original window frame. Write down the smallest of the measurements. Take three measurements of the frame’s height: left, centre, and right. Once more, take the slightest measurement.

Measure the diagonals from corner to corner to ensure the frame is square. Both dimensions should be the same. Don’t worry if the frame is a little out of square; the replacement may be precision machined to fit. Anything else may need frame changes. Finally, calculate the slope of the sill using an angle-measuring instrument; some replacements come with various sill angles.


What to Do If You Find Rotten Wood?


Inspect the window frame for rotten wood. To check for rot, run a flat-head screwdriver around the frame. If you see soft patches or splintered wood, have the window frame replaced by a professional. Rather than trying to install a new window or replace an old one, your best chance is to put a plywood board over the window’s exterior side until your contractor can check it. A replacement window must be fitted in a sturdy, rot-free frame, and a rotten frame may indicate more serious structural issues.


Drop-In Windows


Because the existing window frames are used, installing drop-in windows is a simple operation that you can perform yourself. The original sashes, jamb-liners, and storm windows must be removed first. To break the paint seal, run a razor blade around the edge of the storm window. Then, using a screwdriver, remove all of the screws from the storm window—you might need to scrape paint off the screws. After you’ve removed all of the screws, you’ll be able to take the storm window off the house.


The stops are tiny wood pieces that hold the sash in the frame. Carefully pry them apart. Slowly work your way up and down the window’s length. The stops have been hammered in place. Pull the leftover nails out of the frame once the stop is removed. Remove the stops on both sides before moving on to the top. Pry off the head parting stop after removing both side and top stops. This isn’t anything you’ll need to utilise again. The jamb liners should now be accessible. Using a pry bar, loosen the liners.


The window balances are housed in the jamb liners, joined to the sashes by these vast springs. Remove the sashes from the liner with care since the balances may spring out if not properly managed. Cleaning the window frame before putting the new window is a good idea. To put the new window in place, carefully raise it up and into the frame, ensuring it goes in the appropriate direction.





Anything else will stretch the frames and prohibit the window from opening and closing; always use low-pressure, gently expanding foam meant for windows and doors. First, clean out the weight compartments of any existing fibreglass. Then, one at each end and one in the middle, drill 1/8 ” holes through the sill and up through the head jamb.


Knowing about the various window replacement possibilities can assist you in making a more appropriate purchase for your house. When a window is broken, having to replace it might be intimidating. There will be decisions to make and money to spend. You may save a little money while still keeping your house safe and comfortable by replacing your windows with pocket windows. Hopefully, this post has provided you with a better understanding of replacing your windows while keeping the old frame. You are wishing you the best of success with your renovation project.


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