Apartment Soundproofing Without Renovation: 5 Solutions That Really Work

Each solution targets a different type of noise, and most can be combined. This guide details the real effectiveness of each, its limitations, its cost, and how to combine them to reduce noise in your apartment without undertaking any construction work.

Why noise is a real problem in apartments

According to ADEME's national noise survey (2022), 68% of French people living in apartments report being bothered by noise in their homes. Noise in an apartment comes from three distinct sources, each with a different sound level and treatment:

• Outdoor airborne noise (traffic, horns, street work): 70 to 80 dB. Mainly enters through windows and the front door.
• Indoor airborne noise (neighbors' voices, television, music): 40 to 65 dB. Passes through party walls and floors.
• Impact noise (footsteps on the floor, falling objects, slamming doors): 50 to 70 dB. Spreads through the building's structure itself.

The weak points of an apartment are identifiable: windows (especially single-glazed or with worn seals), thin party walls (particularly in post-war constructions), uninsulated floors, and the front door, which often opens onto a resonant hallway. The World Health Organization (WHO) recommends less than 40 dB for sleep and less than 55 dB for daily life. When you are a tenant or do not want to undertake major renovations, the five solutions below allow you to get closer to these thresholds without a drill, without authorization, and without an excessive budget.

Solution 1: Acoustic curtains for windows (up to 22 dB)

This is the most effective solution for insulating an apartment from street noise without any work. The reason is simple: windows are responsible for about 40% of a dwelling's sound loss, even with double glazing. A high-density acoustic curtain creates an additional barrier between the windowpane and your interior, capable of significantly attenuating the perceived sound level.

Kurtens technical curtains offer a measured attenuation of 22 dB*. This figure is considerable: each 10 dB reduction halves the sound volume perceived by the human ear. With 22 dB of attenuation, bothersome traffic noise (70 dB) becomes a barely perceptible background noise (48 dB). To understand in detail what decibels represent, consult our article on what 30 dB noise-reducing curtain really means.

Beware of the difference between a simply thick curtain and a true noise-reducing curtain. A heavy decorative curtain (150-300 g/m²) only attenuates 5 to 7 dB, barely perceptible. A technical acoustic curtain uses a high-density fabric (500 g/m² and more) and a multi-layer construction specifically designed to absorb sound waves. The weight and number of layers make all the difference between a cosmetic result and a real noise reduction.

The other determining factor is coverage. A curtain that does not fully cover the window allows sound to seep in through the sides, top, and bottom. A custom-made acoustic curtain, manufactured to the exact dimensions of the window, consistently outperforms a standard model by 3 to 5 dB due to the elimination of lateral sound leaks. At Kurtens, each curtain is made to order up to 270 cm in height, with the added benefits of thermal insulation (up to 7 °C gain*) and total blackout (100%*).

Honest limitation of this solution: acoustic curtains address windows and doors. They do not address noise passing through party walls or the floor. If your primary problem is the next-door neighbor, the curtain alone will not be enough.

Solution 2: Weatherstripping on windows and doors (3 to 5 dB)

Weatherstripping is the natural complement to acoustic curtains and often the least expensive starting point. Worn, flattened, or detached seals create micro-openings through which noise (and cold air) freely infiltrates. Sound behaves like water: it passes through the smallest gap. A 1 mm gap around the entire perimeter of a window is enough to let in a significant amount of noise.

Replacing seals is within everyone's reach: adhesive foam, rubber, or silicone seals, available in DIY stores for 5 to 20 euros per window. Installation takes less than an hour per window. The effect is immediate on whistling sounds and high-pitched noises that passed through leaks, with an estimated gain of 3 to 5 dB.

The effectiveness remains limited: new seals correct occasional leaks but do not add insulating mass to the window surface. This is why the combination of new seals + acoustic curtain represents the best possible window insulation without construction. The seals eliminate leaks, and the curtain adds absorbent mass. Together, the cumulative gain can reach 25 to 27 dB.

Solution 3: Thick carpets and acoustic underlays on the floor (10 to 20 dB on impacts)

If your main problem concerns impact noise (footsteps from the upstairs neighbor, footsteps in your own home, falling objects), a thick carpet on the floor makes a noticeable difference. The fabric absorbs vibrations before they are transmitted through the floor and simultaneously reduces sound reverberation in the room. According to measurements from standard NF EN ISO 10140-3, a thick carpet with an underlay can reduce impact noise by 10 to 20 dB.

An acoustic underlay placed under the carpet amplifies the effect. The most effective underlays:

• High-density felt: 10 to 15 dB impact reduction, good durability
• Recycled rubber: 15 to 20 dB impact reduction, more effective but more expensive
• Polyurethane foam: 8 to 12 dB, economical option but less durable

The investment remains moderate (20 to 60 euros per m²) and installation requires no particular skill. The carpet also reduces the noise you transmit to the downstairs neighbor, a gesture of good neighborliness that can resolve conflicts before they escalate.

However, this solution does not address outdoor noise (street, traffic). For airborne noise entering through windows, acoustic curtains remain essential. The two solutions address different problems and complement each other perfectly.

Solution 4: Furniture and bookshelves against party walls (5 to 10 dB)

This solution costs nothing if you rearrange your existing furniture. The physical principle is the same as for acoustic curtains: mass blocks sound. A bookshelf full of books placed against a party wall adds 10 to 20 cm of dense material between you and your neighbor's noise. Books, with their irregular fibrous structure, absorb sound waves particularly well. The estimated gain is 5 to 10 dB depending on the mass and thickness of the furniture.

Practical strategy:

• Identify the wall from which the noise comes (the one you share with the noisiest neighbor)
• Concentrate as much heavy furniture there as possible: bookshelf, wardrobe, chest of drawers
• Fill the furniture: a full piece of furniture insulates, an empty piece of furniture resonates and can amplify certain frequencies
• Avoid placing furniture directly against the wall: a 1 to 2 cm gap creates an air gap that improves insulation

The limitation is obvious: this solution only works on one wall at a time and does nothing against noise entering through windows, the ceiling, or the floor. It is an effective complement for neighborhood noise, not a global solution.

Solution 5: Decorative acoustic panels (reverberation reduction)

Wall acoustic panels reduce reverberation inside your room, i.e., the echo and resonance that amplify the sensation of noise. In an apartment with smooth walls and hard floors, sound bounces from surface to surface and creates a tiring sound environment. The panels absorb 20 to 50% of these reflections depending on their density and thickness, making the space noticeably quieter.

Pay attention to an important distinction: acoustic panels do not block incoming noise. They treat sound once it is in the room by reducing its reverberation. This is the difference between soundproofing and acoustic treatment, two complementary but fundamentally distinct things. To block noise at its source (window, door), you need a soundproofing solution like a curtain. To improve indoor sound comfort, an acoustic panel is relevant.

Panels are now available in decorative versions: colored felt, perforated wood, designer foam. Expect to pay between 15 and 80 euros per panel depending on the size and material. For a room of 15 to 20 m², 4 to 6 panels are usually enough to significantly reduce reverberation.

Comparative table of the 5 solutions

The most effective combination for an apartment exposed to street noise: custom-made acoustic curtains for windows + new seals + carpets on the floor. These three solutions together address both outdoor airborne noise, occasional leaks, and impact noise, without any work.

Frequently Asked Questions

Reducing noise in your home, where to start?

Among the five solutions in this guide, custom-made acoustic curtains are the most effective and simplest to implement against outdoor noise. Immediate installation, no tools required, perceptible results from the first night. Combined with new seals on your windows, the cumulative gain can reach 25 to 27 dB, which is the best possible window insulation without any work.

Discover our custom-made acoustic curtains: 22 dB of measured attenuation*, made to the exact dimensions of your windows, delivered in 2 to 3 weeks. Each curtain combines soundproofing, thermal insulation (up to 7 °C gain*), and total blackout (100%*), in 7 colors. Prefer to explore our complete noise-reducing range? Consult our custom-made noise-reducing curtains.

*Data from tests performed under optimal conditions.