Blackout shades are one of the most effective ways to improve sleep, boost privacy, and control light—but only when they’re ordered and installed correctly. Because blackout shades rely on precise coverage and proper fit, even small mistakes can lead to unexpected light leaks or performance issues.
The good news? Every one of these mistakes is easy to avoid with a little planning. Whether you’re outfitting a bedroom, nursery, home office, or media room, use this guide to confidently choose blackout shades that truly deliver the darkness you’re expecting.
Mistake #1: Measuring Only Once (or Using the Wrong Tools)
Why it matters:
A perfect blackout depends on a perfect fit. Even a ⅛ inch of error can lead to halo light around the edges—especially for inside-mounted shades.
How to avoid it:
- Always measure with a steel tape measure.
- Measure width and height in three places (top, middle, bottom).
- For inside mount, record the narrowest width.
- For outside mount, add 2–3 inches to each side to eliminate edge leaks.
SelectBlinds provides step-by-step measuring guides to help you get it right the first time.
Mistake #2: Choosing the Wrong Mount Style
Why it matters:
The mount type is the #1 factor affecting blackout performance. Inside mount looks clean but often leaves small gaps. Outside mount typically delivers stronger blackout coverage.
How to avoid it:
- Choose inside mount for a streamlined look—but expect some minimal edge light unless paired with side channels.
- Choose outside mount when your main goal is maximum darkness.
If blackout is your priority—especially for bedrooms and nurseries—outside mount is almost always the better choice. Total blackout is the other option if inside mount is preferred.
Mistake #3: Confusing “Room Darkening” with “Blackout”
Why it matters:
Room-darkening shades dim the light, but they don’t eliminate it. Blackout fabrics block 99–100% of incoming light.
How to avoid it:
Always check the listing:
- Room Darkening: Soft glow remains, not ideal for sleep spaces.
- Blackout: Nearly total darkness, ideal for bedrooms, nurseries, and media rooms.
- Total Blackout: Ideal if you’re looking for 100% blackout.
At SelectBlinds, look for the term “blackout” in the product specs for full light-blocking performance.
Mistake #4: Ignoring Light Leaks From Hardware or Fabric Style
Why it matters:
Even blackout fabric can leak light if the design includes route holes, has a curved bottom rail gap, or floats away from the window frame.
How to avoid it:
Choose styles naturally designed to reduce leaks:
- Blackout Cellular Shades (great edge coverage and insulation). Shop Cordless Blackout Cellular Shades today—total darkness, total comfort.
- Blackout Roller Shades with optional side channels. Add Casual Room Darkening Roller Shades to cart—room-darkening rollers built for everyday comfort.
- Fabric-wrapped or flush-mounted headrails. Order Cordless Light Filtering Pleated Shades now—cordless, lightweight, and easy to love.
- Total Blackout: Zero hassle. Turn any room dark without drilling or damage, order Click2Fit Total Blackout Roller Shade today.
Look for designs labeled specifically for blackout effectiveness—not just the fabric.
Mistake #5: Forgetting About Lift Systems
Why it matters:
Corded blackout shades can create small but noticeable gaps where cords run through the fabric or when a lift system doesn’t sit flush against the top of the frame.
How to avoid it:
- Choose cordless for a cleaner, safer, tighter fit.
- Choose motorized for perfect raising/lowering every time.
- Avoid corded blackout blinds unless route-less options are available.
Cordless and motorized blackout options not only look better—they perform better.
Mistake #6: Overlooking Fabric Opacity and Color Choices
Why it matters:
Some darker fabrics naturally absorb light, while lighter fabrics may show a faint glow—even in blackout materials.
How to avoid it:
- If you want pitch black, choose dark-colored blackout fabrics.
- If brightness still matters during the day, layer blackout rollers with sheer curtains.
- When in doubt, order free samples—seeing fabric in your own lighting is essential.
SelectBlinds offers up to 15 free swatches a day, so you can compare textures and opacity side by side.
Mistake #7: Choosing the Wrong Shade Style for the Room
Why it matters:
Every blackout shade performs differently depending on the room’s needs and window layout.
How to avoid it:
Best for bedrooms & nurseries:
- Blackout cellular shades. Perfect for bedrooms, nurseries, and media room, shop Click2Fit Cordless Total Blackout Cellulars now.
- Blackout roller shades. Turn your space into a calm, dark retreat, order Select Blackout Roller Shades today.
- Roman shades with blackout lining. From light linens to textured neutrals, buy Coastal Roman Shades now.
Best for media rooms:
- Roller shades with side channels
- Motorized blackout rollers
Best for bathrooms:
- Moisture-resistant blackout rollers
- Waterproof vinyl blackout options
Your space dictates what will perform best—especially in humidity or extreme lighting conditions.
Mistake #8: Overlooking Installation Details That Affect Light Blocking
Why it matters:
Even the best blackout shade can leak light if installed just slightly off-center or too high/low.
How to avoid it:
- Use a level during installation.
- Ensure brackets align flush and evenly.
- For outside mount, extend width far enough to cover trim.
- Test for leaks before final tightening.
Installation and accuracy go hand in hand with true blackout performance.
Conclusion: Order Blackout Shades With Confidence
Blackout shades can make a huge difference in your home—from deeper sleep to better privacy to more comfortable movie nights. And with a little planning, you can avoid the common pitfalls that lead to light leaks or disappointment. By choosing the right mount type, fabric, lift system, and proper measurements, you’ll get blackout shades that work exactly the way you want.
SelectBlinds makes it even easier with clear measuring guides, customizable blackout options, and free fabric samples to help you compare your favorites. When you’re ready to upgrade your windows, our Design Consultants are here to help you choose blackout shades that fit your space perfectly—no guesswork required.
