Do You Need Blackout, or Will Room Darkening Get the Job Done

Plainfield Window Treatments · 2026-09-08

Every fabric shade on the market falls somewhere on a spectrum from barely dimming a room to blocking nearly all of the light, and blackout and room darkening are two specific, different points on that spectrum.

What Blackout and Room Darkening Actually Mean

A lot of homeowners assume any shade labeled blackout will turn a room pitch black, and that any shade labeled room darkening is basically the same thing with a softer name. Neither assumption holds up once the shade is actually installed. Blackout describes the fabric's ability to block light passing directly through the material, and it does that job well. Room darkening does the same job to a slightly lesser degree, blocking most but not all of the light through the fabric itself.

What neither label addresses is the light that sneaks around the shade rather than through it, which is often the bigger factor in how dark a room feels at night.

Understanding that distinction before ordering saves a lot of disappointment, especially for anyone in Plainfield expecting a blackout label alone to solve a bright bedroom.

How Much Light Gets Through, Realistically

Here's the part that catches people off guard: an inside-mounted shade in a Plainfield home, blackout fabric or not, almost always leaves a thin gap along the sides and sometimes the bottom, because the shade has to be slightly narrower than the opening to operate without rubbing against the frame. That gap is usually a quarter inch to half inch per side, and light finds it.

Room darkening fabric blocks most light through the material but doesn't do anything about that edge gap, so a room darkening shade on an inside mount lets in both the small amount of light the fabric itself doesn't stop and the light sneaking around the edges. Blackout fabric closes the first source but not the second, so even a true blackout shade on an inside mount will show a thin line of light around the perimeter, especially at night with an outdoor light nearby.

Outside mount with a wider fabric overlap, or an outside mount with side channels that the shade slides into, cuts down on that edge light dramatically. If full darkness is the actual goal, the mount matters as much as the fabric grade, sometimes more.

Which Rooms Call for Which Option

In a Plainfield home, fabric construction should follow room function, not the other way around. A primary bedroom, especially one facing west or used by a shift worker sleeping during the day, is where the full blackout construction earns its cost. A nursery is similar, though some households actually prefer the softer glow of room darkening for nighttime visits.

Living spaces used mostly during the day, like a kitchen or a dining room, generally don't need the heavier blackout build, and neither does a typical home office. Room darkening or an even lighter fabric keeps those rooms feeling open while still cutting glare and reducing UV exposure on furniture and flooring.

A media room or home theater is the other clear case for blackout, since the whole point of the room is controlling light precisely, on demand, regardless of what time of day it is outside.

How the Fabric and Construction Differ

The extra cost of blackout buys real material, not just a label. It's typically built in layers, a face fabric bonded to a foam or acrylic core with a backing behind that, compared to room darkening's lighter single-layer liner setup. That's a meaningful difference in how much fabric and labor goes into each shade.

Knowing that helps make sense of the price gap when it's sitting on a quote. It isn't an arbitrary upcharge, it's a heavier, more complex product doing a more specific job.

It's also worth remembering that blackout's extra bulk can mean a slightly larger roll at the headrail, which occasionally calls for a bigger valance or cassette to hide it. That's a small added cost worth asking about rather than discovering after installation.

Price Difference Between Blackout and Room Darkening

As a general national range, room darkening cellular or roller shades for a bedroom typically run $100 to $300 per window. Blackout versions of the same product usually cost somewhere between $130 and $380, generally 15 to 25 percent more, due to the extra fabric lamination.

Upgrading the mount, a wider outside mount or side channels for a fuller light seal, adds a bit more on top of the fabric cost itself, though it's often a smaller add than the jump from room darkening to blackout fabric in the first place.

For a primary bedroom where sleep is the priority, most Plainfield homeowners find the extra cost of blackout worth it. For a guest room or a kid's room where the priority is softer, room darkening is a reasonable place to save. A free in-home measure will price both out for the specific rooms you're working with.

Working out where blackout is worth the extra cost and where room darkening does the job just as well is easiest room by room, with real measurements in hand. A free in-home measure is a low-pressure way to get there. Call (317) 999-5154 to set one up.

Frequently Asked Questions

Will a blackout shade make my room completely dark?

It gets close, but not entirely, especially on an inside mount. Inside-mounted shades need a small gap along the edges, usually a quarter inch to half inch per side, to operate without rubbing the frame, and that gap lets some light through regardless of the fabric.

What's actually different between blackout and room darkening fabric?

Blackout fabric is built with multiple laminated layers, typically a face fabric bonded to a foam or acrylic core with a backing behind that, which makes it fully opaque. Room darkening fabric usually skips one of those layers, relying on a lighter liner that blocks most but not all light.

Do I need blackout in every bedroom?

Not necessarily. It depends on how the room faces and who's sleeping in it. A west-facing primary bedroom or a shift worker's room usually benefits most, while a guest room that sees occasional use is often fine with room darkening.