Restaurant acoustic curtains: improving acoustics without renovation work
A noisy restaurant tires diners, shortens meal times and generates negative reviews. According to the Zagat 2018 Dining Trends Survey (nearly 13,000 customers surveyed), noise is the number one source of irritation in a restaurant, cited by 24% of customers, ahead of service (23%). Sound levels in a busy restaurant reach 75 to 85 dB at peak hours, the equivalent of a vacuum cleaner running constantly. High-density soundproof curtains on the windows reduce outside noise by 18 to 22 dB and absorb part of the indoor reverberation, improving acoustic comfort with no renovation work.
This professional guide details the impact of noise on a restaurant's revenue, the acoustic solutions by type of establishment, and the concrete return on investment.
What noise really costs a restaurant
Noise in a restaurant is not just a comfort issue. It is a measurable business problem:
- Shorter meal times: in a noisy environment (80+ dB), diners speak louder (the Lombard effect), tire faster and leave earlier. The average meal time drops by 15 to 20% (source: psychoacoustic research on dining, University of Lund). Less time at the table means fewer desserts ordered, fewer coffees, fewer add-on sales.
- Negative reviews: 25% of complaints on review platforms (Google, TripAdvisor, TheFork) mention noise. A restaurant rated 4.2 stars can lose 0.1 to 0.2 points to noise alone, which reduces the booking rate by 5 to 10%.
- Customers who do not return: noise-sensitive customers (families with children, couples, business clients) do not come back and do not always say so in a review. It is a silent loss of loyalty.
- Staff turnover: servers and cooks exposed to 80+ dB for 8 hours suffer chronic auditory fatigue. Prolonged noise exposure is a turnover factor recognized by occupational medicine.
Where does the noise in a restaurant come from?
| Noise source | Typical level | Type | Curtain solution |
|---|---|---|---|
| Diner conversations | 65-75 dB (Lombard effect: everyone speaks louder to be heard) | Indoor reverberation | Absorption by the dense fabric (reverberation reduced by 20-50%) |
| Street noise | 55-75 dB through the windows | Airborne outdoor noise | 18-22 dB attenuation on the windows |
| Open kitchen / pass | 70-85 dB (extractor hoods, dishes, voices) | Direct indoor noise | Divider curtain between kitchen and dining room (if the layout allows) |
| Background music | 55-70 dB (variable) | Controllable indoor noise | The curtain reduces reverberation, so the music is clearer at a lower volume |
| Dishes, cutlery, chairs | 60-75 dB (intermittent peaks) | Indoor impact noise | Limited effect (impact noise). Solution: chair pads, tablecloths |
The vicious circle of restaurant noise: when the sound level rises, every diner speaks louder to be heard (the Lombard effect, +3 dB per person). Neighbouring tables do the same. The level spirals upward. A restaurant that goes from 70 to 80 dB in 30 minutes of service is one where no one can hear each other. Curtains break this circle by absorbing the first reflections and reducing the baseline noise.
How curtains improve a restaurant's acoustics
Function 1: blocking outside noise (windows)
Restaurants in the city centre, on busy roads or with a terrace often have large windows that transmit street noise. A high-density soundproof curtain (620 g/m²) on each window attenuates 18 to 22 dB of outside noise. Traffic (70 dB) drops to 48-52 dB: a background level that no longer drowns out table conversations.
This is especially critical for fine-dining restaurants and establishments with a glazed terrace: street noise destroys the hushed atmosphere the restaurateur is trying to create.
Function 2: absorbing indoor reverberation
A restaurant with smooth walls, a hard floor (tiles, polished concrete, parquet) and large windows is an echo chamber. Sound bounces from surface to surface and amplifies. A 620 g/m² curtain covering a 4 m² window is the equivalent of a giant 4 m² acoustic panel. It absorbs a significant part of the sound reflections, reducing the reverberation time by 20 to 40%.
The perceived result: conversations are clearer, the music is crisper, and the overall sound level drops by 3 to 6 dB (the noise seems cut in half). Diners no longer have to shout to be heard.
Function 3: creating atmospheres and zones
Curtains let you segment the dining room visually and acoustically. A dense curtain between two seating zones creates a separation that reduces direct sound transmission between groups. This is especially useful for restaurants with a single room that hosts noisy parties alongside couples looking for intimacy.
Regulatory note (AM 11 §1): it is strictly forbidden to place curtains across walkways (corridors, circulation routes, emergency exits). A zone divider curtain must never block an evacuation route. It must be positioned between seating zones, not across a circulation route. When in doubt, consult your inspection office before installation.
Solutions by type of restaurant
| Type of restaurant | Main acoustic problem | Priority curtain solution | Fire class |
|---|---|---|---|
| Fine dining | The slightest street noise destroys the hushed atmosphere | Soundproof curtain on every window (22 dB*) + reverberation absorption | M2 required if the room is > 50 m² (AM 12 b) |
| Bistro / brasserie | Hubbub of conversations, Lombard effect at peak service | Curtains on the windows (reverberation) + divider curtains between zones | M2 required if the room is > 50 m² (AM 12 b) |
| Restaurant with a glazed terrace | Large glazed surfaces = outside noise + summer overheating | Soundproof + thermal curtains on the patio doors (dual benefit) | M2 required if the room is > 50 m² (AM 12 b) |
| Restaurant with an open kitchen | Kitchen noise (extractor hoods, dishes) carried into the dining room | Dense divider curtain between pass and dining room (if the layout allows, clear of walkways) | M2 if the room is > 50 m². Note AM 11 §1* |
| Private / events room | Insulation between the private room and the rest of the restaurant | Dense soundproof curtain as a flexible partition (foldable, clear of walkways) | M2 if > 50 m². Not required if < 50 m² |
The return on investment for a restaurant
| Item | Calculation | Amount |
|---|---|---|
| Investment | 80 m² restaurant, 4 windows, made-to-measure M1 curtains | 1,200-2,500 € |
| Meal-time gain | +10% time at the table → +1 dessert or coffee across 5 tables/evening → +15 €/evening × 300 days | 4,500 €/year |
| Online review gain | Fewer noise complaints → +0.1 rating point → +5-10% bookings | Variable (significant) |
| Energy savings | 4 windows × thermal insulation (7°C gain*) → lower heating/AC | 500-1,500 €/year |
| ROI | Investment 1,200-2,500 € / annual gain 5,000-6,000 € | 3 to 6 months |
The ROI is fast because the impact is daily (300+ open days a year) and the gain stacks across several levers (add-on sales, reviews, energy). It is one of the most profitable investments for a restaurateur after the kitchen fit-out.
Constraints specific to the restaurant trade
- Fire classification: restaurant dining rooms larger than 50 m² require at least M2 for curtains (article AM 12 b of the order of 25 June 1980). M1 is only required in enclosed stairwells (AM 12 a) and on stages/platforms (AM 13). M1 is nonetheless recommended for maximum safety. Kurtens supplies M1 certification on request with an accredited laboratory test report.
- Resistance to kitchen odours: curtains near the kitchen absorb cooking smells. A wash every 2-3 months (30°C, delicate cycle) is recommended. The structural multilayer curtain withstands 50+ washes with no loss of performance.
- Interior aesthetics: the curtain is a decorative element that contributes to the restaurant's atmosphere. In B2B, the colors are fully customizable to match each establishment's visual identity. Samples available on request for sign-off with the decorator or interior architect.
- Frequent handling: curtains are opened and closed several times per service (depending on light, heat, noise). Eyelets offer the smoothest glide for intensive daily handling.
Key takeaways
Noise is the second most common complaint in restaurants and it directly affects revenue: shorter meals, lost add-on sales, negative reviews, customers who do not return. High-density soundproof curtains on the windows handle outside noise (18-22 dB) and absorb indoor reverberation, all with no work, no closure and an ROI of 3 to 6 months.
For a tailored quote for your restaurant: request a professional quote. M1 certification available on request, made-to-measure manufacturing, quote within 24 working hours, no minimum order. To find out more: made-to-measure curtains for restaurants.
*Data from tests carried out under optimal conditions.
Frequently asked questions
How can you reduce noise in a restaurant without renovation work?
Three actions with no work, in order of impact: high-density soundproof curtains on the windows (18-22 dB of outdoor attenuation + reverberation absorption), acoustic wall panels (reverberation reduced by 20-50%), and thick-fabric tablecloths/placemats (which absorb dish noise). Curtains on the windows are the first action because they handle the one source the panels do not cover: street noise.
What is the normal noise level in a restaurant?
A busy restaurant reaches 70-75 dB in normal service and 80-85 dB at peak (Friday night, groups). For comfortable conversation, the level should not exceed 70 dB. Above 75 dB, diners have to raise their voice (the Lombard effect). Above 80 dB, auditory fatigue sets in and meal time drops by 15-20%.
What fire class for restaurant curtains?
M2 required for rooms larger than 50 m² and for walkways (article AM 12 b of the order of 25 June 1980). M1 only in enclosed stairwells (AM 12 a) and on stages/platforms (AM 13). Almost all commercial restaurants exceed 50 m² and are therefore subject to at least M2. M1 is recommended but not required in the dining room. M1 certification is available on request from Kurtens. It is forbidden to place curtains across walkways (AM 11 §1).
How much do soundproof curtains for a restaurant cost?
For an 80 m² restaurant with 4 windows in made-to-measure M1 curtains: 1,200 to 2,500 euros. The return on investment is 3 to 6 months thanks to the gain on add-on sales (longer meals → more desserts and coffees ordered) and energy savings. Tailored quote within 24 working hours, no minimum order.
Do curtains absorb kitchen odours?
Curtains near the kitchen or the pass can absorb cooking smells over time. A wash every 2-3 months (30°C, delicate cycle, no fabric softener) is enough to remove accumulated odours. The Kurtens structural multilayer curtain withstands 50+ washes with no loss of performance (blackout, soundproof, thermal). Coated curtains only withstand 10-15 washes and are unsuited to the restaurant trade.
Can a curtain act as an acoustic partition between two zones?
Yes. A high-density curtain (620 g/m²) hung between two zones of the dining room creates a visual and acoustic separation that reduces direct sound transmission between groups of tables. It is a flexible solution: the curtain folds back when you need the full space (large groups, events). Kurtens curtains are made to measure in any width, adapted to the layout of your dining room.
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