Measuring Guide

Three Measurements.
That's All You Need.

Follow three easy steps to get the perfect fit on the first try. Have a question? We're happy to help. Reach us at support@lightsout.com.

✓ Every order is custom made from your measurements
↺ If the fit isn't right we'll remake it for free
✉ Not sure? Reach out for support in the chat

Before You Start

Lights Out mounts inside your window recess. Accurate measurements make sure the frame fits snug to seal out light.

What You'll Need

📏 Metal Tape Measure
✏️ Pen & Paper
🕑 5 minutes
Step 1

Measure Your Depth

The frame needs at least 1.2 inches (3 cm) of clear depth inside the recess.

  1. Start tape measure at the front edge of the window recess (closest to you).
  2. Extend it towards the window and write down the distance.
  3. If that number is 1.2" (3 cm) or more, you're good to go.
Watch For Obstructions
Handles, locks, trickle vents etc eat into your usable depth. Measure to the nearest obstruction not to the glass.
Depth Measure from the front edge inward to the shallowest obstruction.

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Step 2

Measure Your Width

Windows aren't always perfectly square. Three measurements catch any variation.

  1. At the top of the recess measure from left inside corner to right insider corner.
  2. Measure again at the middle and at the bottom
  3. Write down all three. Give us the smallest number.
Top Middle Bottom Measure width at three heights.
Record the smallest.

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Step 3

Measure the Height

Same logic. Three spots, smallest number wins.

  1. On the left side of the recess measure from the top wall down to the sill.
  2. Measure again in the center and the on the right side
  3. Write down all three. Give us the smallest number.
Left Center Right Measure height at three positions.
Record the smallest.

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Easy Mistakes to Avoid

Small errors lead to light leaks. Here's how to get the best fit.

📐
✗ Steel tape
✓ Straight & level

Tilting the tape even slightly inflates the number. Keep it flat and parallel to the surface.

🔀
✗ Bent tape
✓ Flat against the wall

A tape measure that bends or curves gives a shorter reading. Press it gently against the recess wall.

🔢
✗ Rounding up
✓ Nearest 1/16"

Round to the nearest sixteenth of an inch.

Works With Most Window Types

If your window has a recess at least 1.2" deep, it's almost certainly compatible.

◻
Fixed
↔
Sliding
↗
Casement
↕
Hung / Sash
△
Awning
⍑
Tilt & Turn
◢
Bay
◼
European
Not Sure About Your Window?
Snap a photo of the window from the front and one of the recess from the side. Send both to help@lightsoutblinds.com and we'll confirm compatibility.

Common Questions

What if my window recess isn't perfectly square?
That's normal — most windows aren't. That's exactly why we ask for three measurements in each direction. The smallest number ensures the frame fits everywhere without forcing or gapping.
Should I use a metal or fabric tape measure?
Metal. Fabric tape measures stretch and sag, which can throw off your numbers by enough to matter. A basic metal tape measure from any hardware store works perfectly.
My depth is under 1.2" — am I out of luck?
Not necessarily. If you're close (1" or more), send us a photo showing the obstruction — sometimes it's a removable handle or an adjustable vent. We can work with you to figure out options.
Do I need to account for handles or locks in my width/height?
Handles and locks only affect the depth measurement (Step 1). For width and height, measure the full recess opening wall-to-wall and top-to-sill — ignore any hardware that protrudes inward.
What if I mess up the measurements?
We've got you. If your blind doesn't fit because of a measurement error, we'll remake it free of charge. No fine print, no arguments. That said, double-checking takes 30 seconds and saves you a few days of waiting.
I have multiple windows — do I need to measure each one?
Yes. Even windows that look identical can vary by a quarter inch or more. Measure each one individually for the best fit.

Got Your Numbers?

Enter your measurements at checkout. We cut your blind to fit — delivered to your door.

Shop Lights Out Blinds →

Still Not Sure?

Send us your measurements or a photo of your window and we'll confirm everything before you order.

help@lightsoutblinds.com