Hotel blackout curtains: the method for total darkness (and guests who sleep)

"Room bright from 6 am" — that sentence in a guest review costs more than any curtain. Total blackout has become an expected standard in hospitality, yet most rooms sold as "blackout" leak light in five perfectly predictable places. Here is the complete method for true darkness.

Why total darkness is a revenue issue, not a comfort one

Sleep quality is one of the criteria most correlated with a hotel's overall score on booking platforms. Stray light = early waking = average review = lower RevPAR. Conversely, flawless blackout is one of the best cost-to-impact fittings, alongside acoustics and bedding.

The three blackout levels — and which to aim for

• Dim-out: filters light, does not stop it. For day sheers only.
• Room-darkening: stops 90–99% of light through the fabric. Fine at home, insufficient in a hotel facing urban night lighting.
• Total blackout: three-layer fabric or blackout lining, 100% opacity through the cloth. The hotel standard — but the fabric is only half the job.

The five light leaks — and their remedies

1. Above the curtain

Light passes between track and ceiling. Remedies: ceiling-recessed track, or a pelmet closing the top.

2. The sides of the window

The classic side halo at dawn. Remedy: returns — the curtain turns 90° to touch the wall on each side, on a curved track.

3. The centre overlap

Two panels that merely touch leave a vertical blade of light. Remedy: crossover tracks with an 8–10 cm overlap.

4. Below the curtain

A short curtain lights the floor. Remedy: hem 5–10 mm from the floor, weighted for consistent contact.

5. The stitching

On a blackout, every needle hole is a point of light. Remedy: dedicated make-up — offset seams, headings sewn to the lining, not through the opaque layer.

Three-layer blackout fabric or separate lining?

The three-layer fabric builds blackout into the decorative cloth: one curtain, impeccable drape, simple care. The separate blackout lining keeps the decorative fabric free and lets you replace function independently of aesthetics. In hospitality we usually recommend the three-layer in guest rooms for reliability — with a day sheer on a second track.

And always: the fire rating

A hotel room is a public building: your blackout must be M1-rated (or Euroclass equivalent), certificate in hand for the fire-safety committee. Quality flame-retardant blackouts exist across every aesthetic range — our guide to fire ratings M1, B1, Cs1d0 details the requirements.

Our "total darkness" protocol

Leak diagnosis in a model room (night test, shutters open), fabric + track + make-up specification, installation with returns and crossover, final check with a light meter. It is one part of our technical curtains offer for hospitality.

See also our dedicated page: Hospitality curtains →