No. Conventional louvred shutters reduce incoming light a great deal when closed, but they are not an engineered blackout system. Light can pass between the louvres, around the panel edges and where panels meet. If you love shutters but need a genuinely dark room, the usual answers are to pair them with a blackout blind or curtains, or to choose a shutter system designed to incorporate a blind.
Why shutters let some light through
A shutter is a series of hinged panels with tilting louvres, fitted in or around the window. To move freely, every part needs a small clearance:
- Between the louvres — even when fully closed, louvres meet with a slight gap, and light can show along the edges.
- Around the panels — panels need clearance from the frame so they can swing open.
- Where panels meet — the joins between folding panels can let a line of light through.
- At the top and bottom — depending on how the frame is fitted to the window.
The result is a room that is much dimmer, with a soft glow around the shutter, rather than a dark room.
How dark will a room be with shutters?
It depends on the shutter, the fit, the colour and the direction the window faces. Many people find closed shutters dark enough for everyday sleeping, particularly in rooms that do not get early-morning sun. But if you are a light sleeper, work shifts or are furnishing a nursery, shutters alone are unlikely to be enough.
Darker shutter colours can make the glow around the edges less noticeable, but they do not close the gaps.
Options for a darker room with shutters
Shutters with a built-in blind
Some shutter systems incorporate a blind that sits behind or within the shutter frame, so you can close the blind for darkness and use the louvres during the day. See shutter and shade.
A blackout blind behind the shutters
A slim blackout roller or cellular blind fitted close to the window, with the shutters in front, can work well — provided there is enough depth in the recess for both and the shutter panels can still open. This needs careful measuring.
Curtains over the shutters
Blackout-lined curtains drawn across closed shutters give a much darker room and add softness. The track or pole needs to be positioned so the shutter panels can still fold open. See blackout curtains and layered window treatments.
Solid panel shutters
Solid panels, without louvres, remove the gaps between slats. They still have clearances around the edges, so they are not a total blackout system either, but they can give a darker result than louvred panels. See solid panel shutters.
Why people still choose shutters for bedrooms
Shutters are hard to beat for adjustable privacy. You can tilt the louvres to let in light while keeping the view in blocked, which is especially useful on street-facing windows. They look tidy from outside, and they suit many period and modern homes alike. For many bedrooms, that combination outweighs the need for complete darkness — and where it does not, a second layer solves it.
How to decide
- Everyday bedroom, not a light sleeper — shutters alone may be fine.
- Light-sensitive sleeper or east-facing window — consider shutter and shade, or curtains over the shutters.
- Nursery or shift work — a specialist blackout blind, possibly layered, is likely to be more reliable. See Blackout Blinds Explained.
We can check the window depth, the opening space for the panels and the best way to combine layers on a free home survey.
Frequently asked questions
Do closed shutters block all light?
No. Some light passes between the louvres and around the panels. The room will be much dimmer, but not dark.
Are solid shutters blackout?
They are darker than louvred shutters because there are no slats, but light can still enter around the panel edges.
Can I add a blackout blind to existing shutters?
Sometimes, if there is enough depth between the shutters and the glass and the panels can still open freely. It needs measuring.
Are shutters good for nurseries?
They are good for privacy and cord-free operation, but on their own they are not dark enough for many parents. Pairing them with a blackout layer is common.