Yes. The moment your interior lights are on after dark, sheer curtains lose most of their privacy and people walking past can see straight through them. It is the single most common complaint we hear on Central Coast consultations, and the fix is straightforward once you understand why sheers behave the way they do.
Sheers are a daytime product doing a daytime job. The trick is to plan for the other twelve hours of the day before the curtains arrive on a truck, not afterwards.
Why sheers go transparent at night
Visibility through fabric is governed by which side has the brighter light source. During the day the outside is brighter than the inside, so light scatters off the outer face of the sheer and a passer-by sees a softly lit wall of fabric. At night that flips. Your living room lamps make the inside the bright side. Light passes through the open weave of the sheer and an observer outside sees almost everything in the room.
It is physics, not a flaw in the fabric. A heavier sheer will reduce the effect, but no sheer at a normal residential weight gives full nighttime privacy on its own. A linen voile at around 120 grams per square metre is effectively transparent at night. A denser privacy-weave linen at 220 to 250 grams per square metre cuts the effect by maybe half. Even then, silhouettes, movement, and the shape of furniture are still readable from the street.
If a salesperson tells you a sheer will give complete privacy day and night, walk out.
What sheers are genuinely good at
It is worth saying what sheers do brilliantly, because the answer is not nothing. We specify them on most of the made-to-measure curtain work we do across Terrigal, Avoca Beach, Wamberal and Killcare, and they earn their place every time.
Sheers do four things well:
- Daytime privacy. When the outside is brighter than the inside, sheers diffuse the view from the street into a soft blur.
You can see out; the world cannot see in. - Glare control. A medium-weight sheer takes the harsh edge off the afternoon sun without darkening the room. On the Central Coast, picture windows facing water, this is often what the room actually needs.
- Softening hard light. South-facing rooms in winter and any room with strong reflected light feel less clinical with a sheer in the frame.
- UV filtering. Sheers cut a meaningful share of UV that would otherwise fade timber floors, leather and artwork.
What they do not do, on their own, is give you privacy at night. Which is the next question?
The honest fix: layering
There are three workable answers to the nighttime privacy problem. None of them is “buy a denser sheer and hope”.
Option 1: Sheer plus blockout on a double track
This is the setup we install most often. Two tracks are fitted parallel, one in front of the other. The sheer hangs on the front track for the day. The blackout hangs on the back track and gets drawn at night for full privacy and full darkness.
Done properly, the two tracks tuck under the same pelmet or ceiling rebate, so you only see one clean line from the room. This is the setup we use on most living and bedroom jobs in renovated Central Coast homes, often with Silent Gliss tracks where the budget supports it.
Option 2: Sheer in front of a blockout roller blind
A space-saving alternative when there is not enough depth in the reveal for two tracks. The sheer hangs on a single track. A blockout roller sits behind it in the reveal. Drawn down at night, the roller gives full privacy. Pulled up during the day, it disappears behind the sheer.
This works well in older homes where the architrave depth makes a double track awkward, and on tall windows where the second track would compromise the install line.
Option 3: A dense privacy-weave sheer plus interior shielding
For the small share of rooms where the buyer absolutely will not accept a second layer, a heavyweight privacy-weave linen sheer can do most of the work if combined with smart lamp placement. Side-fire lamps rather than top-down ceiling light. No bright lamps near the window. Honest answer: it still is not full privacy. It is a compromise that works for some rooms (formal lounges that get used in low light, ground-floor frontage on a quiet street) and fails for others.
A quick reference
| Configuration | Daytime privacy | Nighttime privacy (lights on inside) |
| Standard sheer alone | Good, outside brighter than inside | Poor, silhouettes and movement visible |
| Sheer + blockout on a double track | Good (sheer drawn) | Excellent (blockout drawn) |
| Sheer + blockout roller behind | Good | Excellent (roller down) |
| Dense privacy-weave sheer alone | Better than standard sheer | Still limited, lamp placement matters |
| Blockout curtain alone | Total when drawn (also blocks light) | Excellent |
What we usually recommend on the Central Coast
For most Central Coast living rooms and master bedrooms, the double-track sheer-plus-blockout setup wins. It handles every time of day, looks clean from the room, and runs reliably for fifteen to twenty years if the hardware is specified properly. Where the window is over 2.7 metres tall or the track sits in a hard-to-reach run above a staircase, adding motorisation to the second track is worth the spend. Manual is fine on a standard bedroom; motorisation earns its place on tall and multi-track jobs.
A few practical notes from forty years on the Coast:
- Track-mount, not face-fix, where possible. A ceiling-mounted track lets the curtain return to the wall,
which closes the gap that lets light and view bleed in at the edges. - Returns matter. The fabric should wrap around at each end and meet the wall. Open-ended tracks make every layering decision look worse than it is.
- Stack-back clearance. On a double track, both layers need somewhere to bunch when open. Plan for it before the install.
- Hardware safety. Any corded curtain or blind in Australia must comply with the mandatory safety standard for corded internal window coverings, and we clearly or guide every install accordingly. The NSW Government’s guidance on blind and curtain cord safety covers what the standard actually requires.
- Fabric care. Salt air ages sheers faster than inland conditions. We cover the basics of looking after fabric window furnishings in coastal homes in a separate post worth bookmarking.
Common questions
Will a thicker sheer give me privacy at night?
Not full privacy. A denser weave at 220 to 250 gsm helps a little, but with interior lights on, silhouettes and movement are still readable from outside. The honest answer is the layering setup, not heavier fabric.
Can I use a blockout curtain on its own and skip the sheer?
You can, and we fit plenty of bedrooms that way. The trade-off is that you lose the daytime softening and glare control that sheer gives you. For bedrooms, it usually does not matter. For living rooms, it usually does.
Do double curtains work on a single rod instead of two tracks?
A double rod can work for an eyelet or tab-top informal look, but for pleated sheers and blockouts (the setup most renovated homes want), a double track is cleaner and operates better. Rods are a styling choice, tracks are an engineering choice.
What about S-fold sheers? Do they make any difference to nighttime privacy?
No. S-fold is a heading style that changes how the curtain stacks and drapes; it does not change the weave or the physics. The same fabric in a pinch pleat or S-fold gives the same nighttime visibility.
Is the curtain industry honest about this?
Not always. Plenty of category sites describe sheers as a “privacy” product without qualifying it. Our approach is to say it plainly, then specify the layering setup that actually works.If you want someone to walk through the rooms with you and call the right setup for each one (no pressure to decide on the day, no scripted sales pitch), Bryn can come out for a free in-home measure and quote. He has been doing it on the Central Coast since 1986, and most of the privacy and glare problems people describe at the door have a fix that takes about ten minutes to explain at the window.