Cordless Cellular Shades Blackout Honeycomb Blinds 21in x 48in - Dark

In this review the LazBlinds Cordless Cellular Shades are judged as a practical blackout solution for renters and homeowners who need fast, tool-free installation and reliable light blocking. The single biggest reason to buy is the patented No Tools-No Drill mounting system that installs in about 30 seconds for an inside mount, making these shades ideal where drilling is not an option. The review focuses on fit, light control, ease of use and construction so you know exactly what to expect from the dark grey 21in x 48in size.

Key Features

• No Tools-No Drill system: The patented mounting clips let the shade attach inside the frame without drilling, which is ideal for renters or anyone avoiding permanent changes.
• Real blackout construction: A silver-plated layer inside the honeycomb cell blocks sunlight and UV, delivering a dark room for daytime sleeping or improved privacy.
• Cordless operation: The cordless design lifts and lowers smoothly and keeps cords out of reach of children and pets for added safety.
• Adjustable fit: The spring rod extends about 1 in so the actual shade (20 3/5in wide) fits windows roughly 20.7 to 21.6 in wide and the height adjusts from 0 to 48 in.
• Thermal and acoustic benefits: The non-sagging 3/5in cell structure insulates against heat and cold and can reduce exterior noise for a quieter interior.

Who It's For

These shades are best for renters, landlords, and home buyers who need blackout coverage without drilling or tools, and for anyone fitting an inside mount window with a minimum depth of about 1 1/5 in. They work well in bedrooms, nurseries, and bathrooms where privacy and light blocking matter.

Customers who need exact custom widths or an outside mount should look elsewhere, and those who require motorized or top-down/bottom-up functionality will need a different model. Also verify your frame depth before ordering to ensure a proper inside mount fit.

Pros & Cons

Pros

• Fast, tool-free installation that preserves window frames and suits temporary housing situations.
• Effective blackout performance thanks to the silver-plated inner layer, keeping rooms very dark during the day.
• Safe cordless design that is easy to operate and tidier than corded blinds.
• Good insulating cell structure that helps with temperature control and reduces noise.

Cons

• Inside mount only, requiring a minimum frame depth of about 1 1/5 in which limits placement options.
• The listed width is reduced slightly for installation, so careful measuring is required to ensure a precise fit.

Specifications

Brand	LazBlinds
Material	Polyester with silver-plated cell interior
Size (listed)	21in W x 48in H
Actual shade size	20 3/5in W x 48in H
Fit range	Fits window widths ~20.7in to 21.6in
Mount type	Inside mount only, minimum depth ~1 1/5in
Cell structure	Non-sagging 3/5in honeycomb cells

Our Verdict

For anyone needing a quick, no-drill blackout treatment for an inside mount window, these cordless cellular shades are a sensible, budget-friendly choice. They deliver strong light blocking, simple cordless operation, and faster installation than traditional blinds, making them good value for bedrooms and rented spaces where preserving the window frame matters.

Frequently Asked Questions

Can these shades be installed without drilling?
Yes, the LazBlinds No Tools-No Drill system uses patented mounting hardware to install the shade inside the frame without drilling any holes.

Will these shades make a room completely dark?
The silver-plated interior layer provides real blackout performance for substantial light blocking, though minor light may appear around the edges depending on your frame fit.

Is there a minimum frame depth required?
Yes, an inside mount requires about a 1 1/5in minimum window frame depth for proper installation.