Lasers can fix eyesight, help accurately hang shelving, aide in epic cat playtime, and measure for perfect-fitting custom window inserts.

A tape measure will tell you the approximate height and width of a window. Our lasers get within 1/32 of an inch. A tape measure also won’t reach into corners the way a laser beam will, and it can’t be held taut by one person alone. Lasers, clearly the (light)wave of the future, eliminate measurement error.
We ask for diagonals as well as height and width to get the complete picture of your window shape. This tells us if your window frame is out of square.
For fun, our CEO measured a window using a measuring tape (not accepted by our algorithm) and then our laser measure tool. It might not look like a big difference, but it’s enough that on a high-pressure, windy day an insert made with the measurements on the left might fall out.
Measuring Tape:
Top: 31 1/16″
Bottom: 31 1/16″
Left: 50 5/8″
Right: 50 5/8″
Bottom L to Top R: 59 3/4″
Bottom R to Top L: 59 3/4″
Laser Measure Tool:
Top: 31 9/32″
Bottom: 31 3/16″
Left: 50 11/16″
Right: 50 15/16″
Bottom L to Top R: 59 5/8″
Bottom R to Top L: 59 1/2″
Out of Square Window Frames
As houses settle, window frames settle with them. Neither settle evenly, making window frames not perfect squares or rectangles. By getting six laser measurements (left, right, top, bottom, 2 diagonals) we get the exact shape of your window opening and can create a perfect custom window insert.
This isn’t just an issue for historic homes. We’ve made inserts for tens of thousands of homes and 95% of them have been significantly out of square.
This is the best way to insulate windows because the window insert is measured precisely for the window opening. It will have a snug fit and a perfect seal all the way around. For our compression system to work properly, it has to be even everywhere. If you’re looking for how to seal windows for winter, this is the best, most efficient way to do it.

Laser Measuring is Easy
All inserts are backed by a Snug Fit Guarantee because of our laser measurement system. Here’s how we do it:
We send you a laser measure kit with a fun laser measure tool (pew pew). It works just like a flashlight—with the press of a button, you get the dimensions. Enter the measurements displayed on the tool into our online portal. It checks for accuracy.
Our fit experts check the measurements for accuracy (again). If everything looks good, dimensions are on their way to becoming your custom insert. It’s that easy.
We developed the tool and software (with error detecting algorithm) because it’s the best way we know how to seal windows for winter.
Proof Is in the Invisible Windows
A main benefit of Indow window inserts is they disappear into your window frame. We’re able to accomplish this low profile in our compression tubing because of our precise measurements. If we had less precise measurements, we’d have to create bulkier tubing to accommodate for any small errors. So, both performance and aesthetic are ensured by laser measurement.
Hurrah for lasers!
How do I get a measuring kit?
Hi Herb! You will not need a measure kit for getting an estimate for your home – for that we will just need the width and height of your windows. Once you are ready to order, work with your Fit Specialist on providing a deposit to have the laser measurement kit mailed to you. See our full order process here:
https://indowwindows.com/about-indow/how-to-order/
Thank you and we look forward to working with you.
How hard is it to get measurements for an old house my windows have been there forever
Not hard at all! That’s what our laser measurement system was designed for – old windows that are out of square. Our window expers can walk you through the process: https://indowwindows.com/indow-cost/
How do you get a laser kit to measure your windows and how expensive are they
The cost of a window insert depends on the size of your window and the grade type of the insert you choose. You can talk to our window experts to get an estimate and have a laser kit mailed to you: https://indowwindows.com/indow-cost/
Is it possible to design an insert that will fit around an AC unit that has been fitted and installed in a window ledge?
We have created Indow inserts for windows with AC units before. Your Indow representative will be able to speak with you about your window and AC unit to verify compatibility.
How does one obtain a laser measuring kit? This is one poorly-constructed website and I have now spent 20+ minutes on here trying to figure this out, INCLUDING clicking on the link you have provided for customers asking the same exact question.
Filling out an interest form on our Get a Free Estimate page will get you connected with your Indow representative, who will start an order on your behalf and send a Laser Measuring Kit to you.
i have windows that slide sideways. They is also about 6 inch window sill…will the window cover go flush against the wall or how do they work when you have a window sill?
Hi, Jose. Your window sill is actually essential for the Indow insert to fit. We require 5/8″ of flat, unobstructed space in the window frame for the insert to fit properly. For the purposes of noise reduction, the more space you can put between the window and insert, the better, so 6″ of space in your window frame is great!