How to Measure for Custom Blinds
Measuring for window blinds can feel daunting. A slight miscalculation, even by half an inch, can turn your dream window treatment into a disappointing disaster.
As LazBlinds experts, we’ve compiled this foolproof measuring guide. Whether you’re aiming for a sleek Inside Mount or a grand Outside Mount, you’ll master professional measuring in just 5 minutes.
Step 1: Decide on Your Mount Type
Before you pick up that tape measure, you need to decide where your blinds will hang:
- Inside Mount: Blinds are installed inside the window frame. This offers a cleaner, more integrated look, ideal for minimalist styles or when you want to showcase your window trim.
- Outside Mount: Blinds are installed on the wall outside the window frame. This can make windows appear larger and offers superior light blockage (no light gaps at the sides).
Step 2: Precise Measuring for Inside Mount
For inside mounts, accuracy is paramount. Do not deduct any allowances yourself; LazBlinds factory will handle the necessary deductions for a perfect fit.
- Measure Width: Measure the inside width of the window frame at three points: top, middle, and bottom. Record the smallest of these three measurements.
- Measure Height: Measure the inside height of the window frame at three points: left, middle, and right. Record the longest of these three measurements.
- Check Depth: Ensure your window frame has sufficient depth to accommodate the blind’s brackets.

Step 3: Generous Measuring for Outside Mount
For outside mounts, the principle is “better too large than too small” to ensure full coverage.
- Measure Width: Measure the width of the window opening. We recommend adding 2-3 inches to each side (total of 4-6 inches) to minimize light gaps and ensure complete coverage.
- Measure Height: Measure the total height you want the blind to cover, from your desired mounting location above the window to the desired bottom point (e.g., sill or below).

💡 Expert Tips: Avoid Common Mistakes
No Cloth Tape Measures: Always use a metal tape measure. Cloth tapes can stretch, leading to measurement inaccuracies of several millimeters.
Width First, Then Height: Industry standard is typically $Width \times Height$. When ordering on the LazBlinds website, always double-check the input order.
Why Choose LazBlinds Custom Blinds?
At LazBlinds, we understand the uniqueness of every home. Our custom services ensure:
- 100% Perfect Fit: Manufactured precisely to your specifications.
- Easy Installation: Paired with our Installation Guides, even DIY beginners can install them in 15 minutes.
- Diverse Styles: From modern roller blinds to classic wood blinds, there’s a style for every aesthetic.
Measuring for blinds doesn’t have to be complicated. Just follow the “measure thrice, cut once” principle. If you’re still unsure about your measurements, don’t hesitate to contact our customer support team!
Ready to upgrade your windows?




my window inside width is 59 inches,
do you make no drill blinds for that width in the bamboo style or cloth style?
dave
Dear customer, unfortunately, we currently don’t have this size for our no-drill bamboo shades or cloth shades.
I am looking for no drill shades
my windows are 29.75 w X 51.25 tall
what size do I need in the TDBU shade?
many thanks
Dear Customer, You can order 30″W*64″H or 29 3/4″W * 64″H
Having a hard time finding the No drill cordless cellular shade…LIGHT GREY, 22 1/2 W x 64 H in stock.
My window opening is 22 5/8 (smallest of 3 measurements) x 58 3/4.
Would 22 x 64 work?
Thanks for your assistance so I don’t order the wrong thing.
Dear Customer, For No drill blinds, The size should be equal to or larger than your window width, Thank you!