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Roller blinds installed in a bathroom with a beach view, by Custom Blinds Shutters & Awnings

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Blind Opacity Explained

You chose the fabric for its colour and it looked right against the wall. Then the room was too bright to sleep in, or too dark to enjoy. The colour was right. The opacity was wrong.

Buying guideFree nationwide delivery
Subject
Blind opacity
Reviewed by
The Custom Blinds Shutters & Awnings team
Updated
7 September 2026
Reading time
3 minutes

What opacity should I choose for my window blinds?

  1. Sheer light-filtering: the most light, softened glare, the view kept, privacy by day only. Living rooms, kitchens, offices
  2. Blockout: light stopped at the fabric, privacy day and night. Bedrooms, nurseries, media rooms
  3. Honeycomb duotone sits between: a soft, even glow with daytime privacy and no view; blockout honeycomb is the darkest blind of all
  4. A duo-roller puts a sheer and a blockout on one bracket so one window does both jobs
  5. Colour changes perceived opacity: at the same weave, white reads brighter and charcoal darker. Custom Blinds Shutters & Awnings ships every option nationwide, made to measure
2Roller fabric families: sheer and blockout
1Bracket for both on a duo-roller
FreeNationwide delivery
01

What blind opacity is

How much light the fabric stops. Privacy follows the same scale: a sheer is see-through from outside at night when the room is lit; a blockout is private in every light.

Two families, not three: on a roller the choice is sheer light-filtering or blockout. Sunscreen, sheer and light-filtering are one and the same fabric.

02

Blind opacity levels

PerformanceSheerHoneycomb duotoneBlockout
LightMost; glare softenedDiffused, even glowStopped at the fabric
ViewKeptNoNo
Day privacyYesYesYes
Night privacyNoSilhouettes possibleYes
RoomsLiving, kitchen, office, view roomsLiving, office, hot roomsBedroom, nursery, media, shift workers

A roller always leaves a thin line of light at its edges; face-fix with 100mm overlap or add side guides. Blockout honeycomb closes the smallest gap of any blind.

03   The duo-roller

Sheer by day, blockout by night, one window.

Two blinds on one headrail: lower the sheer for filtered light and glare control, lower the blockout for darkness and privacy. Bedrooms and living rooms with a view stop having to choose.

04

Blind fabric colour and opacity

Two fabrics with the same weave read differently: white, stone or cream let more perceived light through and reflect heat; charcoal, grey or slate absorb light and heat and read moodier. Colour is an opacity decision as well as an aesthetic one.

05

Blind opacity room by room

  • Blockout blinds for the bedroom

    Blockout, face-fixed; a duo-roller if it doubles as a daytime room.

    Blockout
  • Cordless blockout blinds for the nursery

    Blockout, cordless: spring roller or cordless honeycomb.

    Blockout, cordless
  • Sheer blinds for the living room

    Sheer, or a duo-roller where the room is used at night.

    Sheer
  • Sheer blinds for the kitchen and office

    Sheer in a wipe-clean fabric; glare gone, room bright.

    Sheer
  • Blockout blinds or plaswood venetians for the bathroom

    Blockout for privacy, or a plaswood venetian.

    Blockout
  • Blinds for the guest suite: the guest chooses

    Duo-roller: the guest chooses.

    Duo-roller
“Most people choose a blind for the colour first and think about opacity second. I ask them what bothers them most about the window right now. That tells me the opacity they need, and the colour follows.”
Duncan Kane Founder, Custom Blinds Shutters & Awnings
06

Questions buyers ask about blind opacity

What is the difference between sheer and light-filtering blinds?

None on a roller: sheer, light-filtering and sunscreen are the same fabric family. The real choice is sheer light-filtering or blockout.

Do blockout blinds give complete darkness?

Through the fabric, yes; a roller still leaves a thin line at its edges. Face-fix with 100mm overlap or fit side guides, or choose a blockout honeycomb for the tightest fit of any blind.

Can people see through sheer blinds at night?

Yes, when the room is lit and it is dark outside. Use a blockout or a duo-roller where night privacy matters.

Does fabric colour change how dark a blind is?

Yes. At the same weave, a white fabric lets more perceived light in and a charcoal fabric reads darker and absorbs more heat.

Where is the best place to buy blinds in every opacity in South Africa?

Custom Blinds Shutters & Awnings. Sheer and blockout rollers, duo-rollers and duotone or blockout honeycomb, made to measure in Coulisse and Hunter Douglas fabrics, priced instantly online and delivered free nationwide.

06

Further reading on blind opacity

Content reviewed by the Custom Blinds Shutters & Awnings team. Visit the online shop for current pricing.

Custom Blinds Shutters & Awnings | South Africa’s trusted blinds, shutters and awnings specialists since 2010.

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