Can I cheat a jam extension?

ontariomomMarch 26, 2013


As discussed in another thread, I have an extra brand new fibergalss window that is a little short for the intended room. One idea that I have been discussing on the kitchen forum, is taking the available, short window to the kitchen and adding it as a second window in that room. The kitchen is rather dark so the natural light would be a bonus. Problem is the available window is 1 inch shorter than the existing kitchen window. It is also narrower, but that is less of a concern. The inner wall on this side of the house is just framed in (outer area is sided, but we would be prepared to fix the siding if the window was installed).

My question for you window experts is as follows: is there a way to cheat the jam extension and/or trim to essentially make the two kitchen windows look as if they are the same height? I have posted the proposed inside wall showing the two windows. The picture shows the existing window with lower trim, and the available window without lower trim as I show the counter under the available window higher to accommodate a wall oven. The kitchen folks are not liking the slight raise in counter height, so that idea will likely be scrapped.

Thanks in advance!


This post was edited by OntarioMom on Thu, Mar 28, 13 at 21:07

Thank you for reporting this comment. Undo
Windows on Washington Ltd


Probably easier to hide the height differential with wider trim of the same style around the shorter window.

I am not sure it would be a real issue to begin with but keep in mind, if it is going to bug you, the cost of a new window is cheap.

Can you put the shorter window somewhere else?

    Bookmark   March 27, 2013 at 8:45AM
Thank you for reporting this comment. Undo

You can also center the window up and down to the window on the left. 1/2 inch on top and 1/2 on bottom. Then add a 1/4 mullion ripped to 1 1/2 to 1 3/4 and nail this to the face of your jamb. This will stretch out the jamb while you use the same size casing. You will have to remove 1/4 inch from your window jamb in order to make room for the mullion.
If your jambs can't be removed. If your casing is 2 1/4, rip the mull to 2 3/4 for the top and bottom. this gives you your inch back. you can leave the side mull at 2 1/4. trim your window with the mull and stack your casing on top of mull. It looks as if your cabinets and counter top will cover the sides so you don't see the side edges where its stacked.
Hope this helps ! Chad

    Bookmark   March 27, 2013 at 10:08AM
Thank you for reporting this comment. Undo


Thanks for your comments. I can't find anywhere else to put the window except keep it in the laundry room with a transom over top. It is funny the inch difference does not bug me much, but my designer and some on the kitchen forum suggested it would certainly look like a mistake. Thanks for your trim idea, that sounds like a fix that will keep costs down.


Thank you so much for the detailed explanation. I will be able to pass along your instructions to our framer. I think your strategy, while a bit of cost labour wise, would certainly do the trick to fool the eye. With the fridge in between the two windows, it won't be often that a person will focus on two windows at the same time. Thanks again for taking the time to response!


    Bookmark   March 27, 2013 at 4:20PM
Thank you for reporting this comment. Undo
Windows on Washington Ltd


Chad's option will not cost much and is a more comprehensive way to do it.

Good idea Chad.

    Bookmark   March 27, 2013 at 8:24PM
Thank you for reporting this comment. Undo


Thanks again for your great idea to balance the height of the two windows. We will be using your idea if we go for the extra window in the kitchen. I say if, as we are now struggling a bit with how to rearrange things in the kitchen layout to give up the wall for the extra window. Hopefully we will find a kitchen layout solution that allows for the extra window.

In the meantime, my second option is to buy a transom to go over the short window and put them in the laundry room. This window/transom would be over a table so the window alone is too high to be seen when seated. Do you have any tricks for after the fact for mulling a window and transom together? For example, with the top jam extension (sorry if that is not what it is called) for the window and lower jam extension for the transom can they somehow be joined into one jam? In other words, can we cut out one, and place one inbetween the two windows. I do apologize if this idea is crazy, but I wanted to see what the best solution would be for joining the two. BTW, our ceilings are just 8 foot for what it's worth.


    Bookmark   March 31, 2013 at 10:06AM
Thank you for reporting this comment. Undo

If I am understanding you correctly you can try this; If your windows have jambs, you can leave them on. Trim the both windows as if it is one. Then place 1/4 mull or bullnose between the two windows on the jamb.


    Bookmark   March 31, 2013 at 11:08PM
Thank you for reporting this comment. Undo

Right, so I don't remove the top jam extension for the window but just butt the two jams together and cover with a bull nose. The bull nose will need to be an inch and a quarter to cover both jams (the window and transom one).

If I have misunderstood your advice, please let me know. If not, thanks for your help!


    Bookmark   April 1, 2013 at 7:45PM
Sign Up to comment
More Discussions
Dual pane window retrofit, for sound blocking, question on thickness.
Been looking at options on vinyl windows with better...
incorporating old leaded glass in new casement windows
We own a home with large leaded glass windows (21)...
Alside Mezzo Window Reviews
I was shown the alside mezzo window by a local contractor....
Full Replacement Questions, Resources?!? Woodwright vs. E-series?
We are in the midst of ordering full-frame replacements...
Love my New Front Door, But It's Still Cold in Entryway
I have my new steel entry door installed with new sidelites....
Sponsored Products
Honey-Can-Do Ironing Boards T-Leg 53 in. x 13 in. Metal Ironing Board
$37.65 | Home Depot
Christopher Knight Home Keaton Wicker Barrel Side Table
Nature Power Flood Lights Solar Powered Outdoor 60 LED Security Light with
$37.75 | Home Depot
Moooi | Random Light - White
$655.00 | YLighting
Super Duty Eastham Black 4-Piece LED Landscape Lighting Set
Lamps Plus
Modern Fan Company | DC Slim Ceiling Fan
$476.00 | YLighting
DENY Designs Cori Dantini Sprinkling Sound Outdoor Throw Pillow - 12778-OTHRP18
$49.00 | Hayneedle
Aged Bronze Outdoor Wall 1-Light
© 2015 Houzz Inc. Houzz® The new way to design your home™