A blackout curtain in a hotel room needs to overhang the window recess by 12-15 cm on each side, overlap at the centre by 15-20 cm, and be mounted on a ceiling track or inside a closed pelmet box; the fabric to order should measure 2 to 2.5 times the finished width, to allow for gathering. A blackout rated above 99% stops virtually all light passing through the fabric, while 90-98% counts as semi-blackout. Soft furnishings in hospitality properties must meet the fire reaction requirements of Italian Ministerial Decree DM 9 April 1994.
That said, there is a fact anyone who runs a property has seen: rooms with brand-new blackout curtains from a good manufacturer, and reviews that still say light was getting in. It is not a contradiction, and it is the subject of this guide. The explanation comes at the end, after tracing the light all the way around the window’s perimeter.
Contents
What guests say about hotel curtains in reviews
On the subject of sleep, reviews are dominated by noise and mattresses, but light is the third most common topic, and it has a trait the other two do not: it gets described with almost technical precision. Nobody writes that they slept badly. They write that light was coming in from the sides of the curtain, that the room was bright by five in the morning, that the curtain did not cover well at the top.
That precision is a gift, because it points to a localised, cheaply fixable defect. Redoing the acoustic insulation of a wall is a building job; replacing a track and widening a curtain by fifteen centimetres per side is half a day per room, and the return in guest scores is disproportionate to the cost. The reason the defect is so widespread lies in the order decisions get made in: the curtain gets treated as a finishing touch, chosen at the end of the build, from measurements taken quickly off the window width. It is the last thing bought and the first thing guests complain about.
Blackout fabrics for hotels: blackout coating, dim-out and sheer compared
Blackout is not a heavy fabric, it is a fabric engineered not to transmit light, and there are two technologies behind it.
Coated blackout has one or more layers of acrylic backing, typically two or three passes. The three-pass version, with a black middle layer, is the one that really stops light and gets close to 100%. It is stiff, drapes poorly, and over time the coating can crack if the fabric is always folded along the same line or washed too aggressively. Woven blackout achieves the same effect with opaque yarns and a very tight weave: it drapes better, ages better visually, generally costs more, and tops out at 96-99%. Two percentage points on a spec sheet look like nothing, and in a dark room they are not.
Sheer fabric, voile or an open-weave polyester blend, does its work during the day: screening the view from outside, softening the light, giving the window depth. It carries more visual weight than the blackout layer, since it is what guests look at for most of the time. On street-facing or low-floor rooms, it needs checking that it provides real daytime privacy: too open a voile does not cover during the day, and in the evening, with the interior light on, it leaves the room perfectly visible from outside.
Combining the two produces the de facto standard for rooms from three stars up: sheer on the front track, blackout on the rear one, with a minimum gap of 8-10 cm so the fabrics do not rub against each other. Anyone wanting to simplify can use a single dim-out layer, with blackout of around 85-95%: it costs less, takes up less space and needs only one track. It works on internal courtyards, less exposed sides and seasonal properties, but not on an east-facing room with an open aspect, where in summer the sun comes in at half past five.
| Solution | Blackout level | Where it makes sense | Indicative price per finished linear metre |
|---|---|---|---|
| Single voile or sheer | 0-20% | Only with intact shutters or roller blinds | 25-55 euros |
| Single dim-out | 85-95% | Internal courtyards, less exposed sides, seasonal properties | 45-90 euros |
| Woven blackout | 96-99% | Exposed rooms, 4-star category | 70-130 euros |
| Three-pass coated blackout | 99-100% | East and south exposures | 55-110 euros |
| Double layer, sheer plus blackout | 99-100% with daytime comfort | Standard for 3, 4 and 5-star rooms | 100-190 euros |
Values vary considerably with the finishing, fabric height, pleat and quantity ordered.
Light leaking through the window: the 5 points to check
This is the part almost no quote addresses. A 100% blackout fabric lets zero light pass through the fabric itself: all the light a guest sees is coming in from somewhere else, and there are five points to check.
The side edges. If the curtain is only as wide as the window, light comes in from the sides and draws two vertical stripes on the wall. You need an overlap of at least 12-15 cm beyond the recess on each side, and on windows flush with the wall you may need a return profile or a wall-mounted guide.
The top, which is the worst offender. An exposed track leaves a continuous gap above the fabric: light enters, hits the ceiling and spreads across the whole room, and in the guest’s perception that single gap is enough to make the room feel bright. It is closed off with a pelmet box, with a valance fitted with side returns, or with a track recessed into the plasterboard.
The centre overlap. Two panels that barely touch, moved even slightly, open into a vertical gap that sends a blade of light onto the bed. You need 15-20 cm of overlap and, on wand-drawn tracks, a crossover carrier that pulls one panel in front of the other.
The bottom, less critical but not negligible: on a fabric cut too short, light reflected off a pale floor bounces back up. The curtain should reach 1-2 cm from the floor if it hangs free, or to the sill with a 15 cm drop if there is a chest or radiator underneath. On radiators the rule is not aesthetic: a curtain covering a heat source blocks air circulation and yellows at the point of contact within a season.
The roller blind box. If it is poorly sealed, light comes in from there and no curtain will stop it. It needs checking during the site survey, not after installation.
There is only one way to check, and it takes three minutes: go into the room mid-morning on a sunny day, close the curtains, close the door, and stand still in the dark. After three minutes the eye adapts and every point of entry becomes visible, including the gap under the door.
Ceiling tracks, valances and curtain installation in hotels
Ceiling-mounted installation is worth it for two independent reasons. The first is technical, because it eliminates the gap at the top. The second is perceptual: a curtain that runs from ceiling to floor elongates the wall and makes the room read as taller, an effect that is very noticeable at ceiling heights between 250 and 270 cm. Only the fixing height and the fabric length change, which makes it one of the few free levers available on rooms with low ceilings, and it works alongside the other choices in room furnishing.
On tracks, hospitality settings need aluminium profiles with sliding carriers, not decorative poles with rings. A pole looks good in a suite, but on a standard room that gets opened and closed four times a day, three hundred days a year, nylon carriers on aluminium last far longer and run silently. The track should be bracketed every 40-60 cm: beyond that distance it starts to flex and the panels begin catching.
The valance closes off light from above, hides the track and gives the room an element that can be coordinated with hotel headboards. We make them either upholstered or on a rigid frame, with an indicative height of 18-25 cm and side returns of 8-12 cm: the return is the part almost everyone forgets, and it is what stops light from wrapping around the side. One last detail worth specifying is a draw wand: without one, the guest pulls the fabric by hand, and within two seasons the leading edge is grey and misshapen.
Motorised curtains in hotels: when it is worth installing them
Motorisation costs indicatively between 250 and 700 euros per opening, including the motor, power supply and control, plus the electrical groundwork.
It makes sense on large glazed walls and tall windows guests cannot reach, where the alternative is a guest tugging at the fabric trying to reach it; in suites, where it is part of the expected experience; and in meeting rooms and breakfast rooms with ribbon glazing, where centralised opening is an operational necessity, because nobody sends a member of staff to close twelve curtains by hand.
It makes no sense on a standard room with a normal window. It adds an electromechanical component that will eventually fail, requires dedicated power, and does not solve any problem the guest actually had. With a limited budget, choosing between motorising the curtains and bringing every room up to a double layer with a closed pelmet box, the second option delivers far more result. If you do motorise, a manual emergency override needs to be built in, and the motor’s noise level needs checking, because a noisy motor in a bedroom at night is a new problem created by whoever installed it.
Washing, maintenance and lifespan of hotel curtains
Polyester and polyester-blend fabrics are the easiest to manage: they wash at 30 degrees, shrink very little, and spring back into shape. Linen and cotton are beautiful and problematic, because shrinkage on first wash can reach 3-5%, which on a curtain 280 cm tall means losing 8 to 14 cm; with a natural fabric, always leave a recoverable hem allowance, or specify dry cleaning. Coated blackout does not tolerate spinning or high temperatures, because the acrylic coating stiffens and cracks.
On frequency, aim for once or twice a year for blackout fabric and twice for sheer, which gets dirty sooner. But the rule that solves the most problems is a different one: number the curtains by room, with a label sewn into the top hem. After a trip to an external laundry, curtains come back mixed up, get rehung on windows of slightly different dimensions, and gaps reappear where none existed before.
On lifespan, a blackout curtain in hotel use holds up for roughly 6-10 years on protected sides and 4-6 years on south and west exposures, where sunlight fades the colour and stiffens the coating. The sign of end of life is not tearing, it is a loss of colour uniformity between adjacent panels, which guests notice immediately. For that reason, buy a spare of 5-10% from the same batch along with the original order, and after two or three seasons it is worth considering swapping curtains between exposed rooms and north-facing ones.
Fire regulations for hotel curtains: fire reaction and certification
Soft furnishings in hospitality businesses fall under the fire reaction requirements set out in Italian Ministerial Decree DM 9 April 1994, and properties with more than 25 beds are subject to fire prevention checks under Presidential Decree DPR 151/2011, activity no. 66. The fabric needs to be certified, with the certificate kept on the premises, because it is the first document requested during an inspection. One operational point often gets missed: a fire-retardant treatment applied after the fact to a fabric not originally certified lapses after washing and must be reapplied, with the intervention documented. Over the working life of a hotel’s soft furnishings, the cost difference between the two approaches disappears.
Why new blackout curtains do not darken a hotel room
The answer to the question posed at the start lies in the fact that the fabric and the gap are two different things, and the quote almost always covers only the first.
When a hotelier buys blackout curtains, they are buying a percentage figure for the fabric’s light transmission. What the guest judges instead is the proportion of the window opening actually controlled: if two centimetres remain uncovered above the track, fifteen centimetres on either side, and a vertical gap at the centre, a 100% fabric and an 85% fabric produce the same result. Money spent on the fabric only pays off once the perimeter is sealed, and until it is, buying a better blackout changes nothing the guest actually sees.
This flips the order of priorities. First the geometry: the overlaps, the centre overlap, the fixing height and closing off the top, which are decisions made at survey and installation stage and cost little. Then the choice between coated and woven fabric, which, once the perimeter is sealed, becomes a question of appearance and durability more than performance. Anyone who tackles the subject in this order should ask for a quote for made-to-measure curtains built on the correct measurements, rather than buying the right curtain in the wrong size.
Frequently asked questions about hotel curtains
How much wider than the window should a blackout curtain be?
The finished curtain must overhang the recess by at least 12-15 cm on each side, and the two panels must overlap at the centre by 15-20 cm. The fabric to order is much more than that, though, because with normal gathering you need 2 to 2.5 times the finished width: on a 140 cm window that means a total fabric width of indicatively 340 to 420 cm.
Is coated or woven blackout better?
Coated blackout darkens more, close to 100%, and costs less, but it is stiff and the coating can crack with aggressive washing. Woven blackout drapes better, ages better visually, and tops out at 96-99%. On rooms heavily exposed to the east and south, coated is the right choice; in suites, woven.
Does every room need a double layer?
No. It is needed where blackout depends solely on the curtain and the exposure is critical. If the room has intact shutters or roller blinds, a good-quality sheer layer may be enough. On east and south-facing rooms with no external shading, a double layer is what genuinely reduces complaints about sleep; elsewhere the approach can vary.
Is it worth mounting curtains at ceiling height?
Almost always. It removes the strip of light above the track and makes the room feel taller, a useful effect at ceiling heights between 250 and 270 cm. The extra cost is minimal, since only the fixing height and fabric length change. Where roller blind boxes already exist, a dedicated pelmet box or a valance with side returns solves the issue.
What happens if I order curtains to match the window width exactly?
You end up with curtains that do not close properly and look flat, because both the side overlap and the gathering are missing. Light comes in from both sides and through the central gap, and the fault cannot be fixed without remaking the panels. The measurement to give when ordering starts from the recess plus the overlaps, multiplied by the gathering ratio.
Do hotel curtains need to be fire-retardant?
In hospitality businesses, soft furnishings must meet the fire reaction requirements of Ministerial Decree DM 9 April 1994, with an approval certificate kept on the premises, and properties with more than 25 beds fall under the checks set out in Presidential Decree DPR 151/2011, activity no. 66. Treatments applied after manufacture lapse with washing and must be reapplied and documented.
How often do they need washing, and how much do they shrink?
Generally once or twice a year for blackout and twice for sheer fabric, which gets dirty sooner. The critical point is not frequency but shrinkage: cotton and linen can lose 3-5% in height on first wash, meaning 8-14 cm on a curtain 280 cm tall. They should be numbered by room before being sent to the laundry.
How long do curtains last in a hotel?
Indicatively 6-10 years on protected sides and 4-6 years on south and west exposures, where sunlight fades the colour and stiffens the coating. The sign of end of life is a difference in tone between adjacent panels, not tearing. A spare of 5-10% from the same batch avoids discovering that a reordered colour no longer matches.
