Soundproofing for Walls & Windows: Costs & Measures 2026

October 5, 2026

4 minutes

In residential buildings, many people suffer from too much outside noise or sounds from neighbouring apartments entering their rooms. Whether in Zurich, Bern, or Basel – targeted measures such as soundproof windows or acoustic facing walls can significantly reduce noise pollution. As of 2026, the Swiss standard SIA 181 provides clear guidelines for sustainably improving living quality through professional soundproofing.

Key facts at a glance

The most important facts about soundproofing in Swiss buildings at a glance:

Swiss standard SIA 181: This standard regulates structural soundproofing in Switzerland and distinguishes between minimum requirements and increased requirements (with a 4 dB difference).
Windows as a weak point: Outdated windows let in a lot of outside noise. As a guideline, modern soundproof windows cost from approx. 800 to 2 500 CHF including installation.
Acoustic facing walls against neighbourhood noise: A professionally installed acoustic facing wall (guideline cost: approx. 60–160 CHF/m²) is the most effective method to stop noise through adjacent solid walls.
Insulation vs. absorption: While sound insulation blocks out noise, sound absorption (e.g. through acoustic ceilings) improves speech intelligibility within the room itself.

For precise planning and measurement, it is always recommended to consult a civil engineer or acoustician.

Important technical terms in building acoustics

Sound insulation

Structural measures that block the transmission of sound from one room to another (or from the outside to the inside).

Sound absorption

The absorption of sound waves within a room by soft materials to reduce reverberation and improve room acoustics.

Impact sound

A form of structure-borne sound that occurs when walking on a floor and is radiated into the rooms below.

Acoustic facing wall

An additional, often freestanding wall construction made of plasterboard and insulation material, which is placed in front of an existing wall to increase soundproofing.

Terms are often confused in acoustic planning. Here are the most important distinctions:

Measures compared: Windows, walls, or room acoustics?

Soundproof windows

Ideal for

Outside noise from road traffic, trains, or airplanes.

Cost range

Guideline 800 to 2 500 CHF per window (including installation), plus approx. 150 to 400 CHF surcharge for special soundproof glazing.

Risks & disadvantages

With insufficient facade insulation, the noise can find another path (so-called flanking transmission).

Who should do it?

Mandatory by a specialist company (window fitter) to guarantee absolute tightness.

Acoustic facing wall (wall insulation)

Ideal for

Noise from adjacent apartments (neighbourhood noise) or noisy stairwells.

Cost range

Guideline 60 to 160 CHF per square metre for a double stud wall in drywall construction.

Risks & disadvantages

Improper installation on exterior walls risks thermal bridges and mould formation.

Who should do it?

Feasible for very experienced DIYers, but a plasterer or timber construction professional delivers safer results.

Acoustic panels & absorbers

Ideal for

Reverberant rooms and poor speech intelligibility in your own home or office.

Cost range

Guideline approx. 95 to 165 CHF per high-quality wooden acoustic panel.

Risks & disadvantages

Does not help against noise from outside or from the neighbouring apartment, but only against reverberation in the room.

Who should do it?

Very well suited as a do-it-yourself (DIY) project.

Step by step to optimal soundproofing

How to proceed if you want to sustainably reduce noise pollution in your rooms.

Determine noise source and type

Find out whether it is airborne sound from outside (traffic), airborne sound from inside (neighbours' voices), or structure-borne sound (impact sound).

Seek acoustic advice

Consult a civil engineer or acoustician for complex problems. They can measure the sound pressure level and check whether the requirements of the SIA 181 standard are met.

Choose the appropriate measure

Based on the analysis, decide whether new soundproof windows, an acoustic facing wall, or measures for impact sound insulation make the most sense.

Commission a specialist company

Have structural changes carried out by professionals. **Safety note:** Faulty insulation on exterior walls can lead to thermal bridges and health-endangering mould.

Optimize room acoustics

If necessary, supplement the structural measures with sound-absorbing elements such as acoustic ceilings or wall panels to reduce reverberation in the room.

A systematic approach saves costs and prevents subsequent building physics damage.

Frequently asked questions about soundproofing

Here you will find answers to the most important questions about sound insulation and noise protection.

How much does a soundproof window cost in Switzerland?

In 2026, you should expect a guideline price of 800 to 2 500 CHF for the complete replacement of a standard window. The special soundproof glazing accounts for a surcharge of approx. 150 to 400 CHF.

What does the SIA 181 standard regulate?

SIA 181 is the authoritative Swiss standard for soundproofing in building construction. It defines minimum requirements as well as increased requirements (with a difference of 4 dB) for protection against noise in buildings.

How much does an acoustic facing wall for wall insulation cost?

The cost of a drywall acoustic facing wall (double stud wall) is between 60 and 160 CHF per square metre as a guideline, depending on the insulation materials used and the complexity.

Can I build an acoustic facing wall for sound insulation myself?

Yes, with manual skills this is possible. However, experts often advise against it, as mistakes can quickly lead to acoustic bridges or building physics problems such as thermal bridges.

What is the difference between sound insulation and sound absorption?

Sound insulation (e.g. through thick walls or windows) prevents noise from outside from entering the room. Sound absorption (e.g. through acoustic panels) reduces reverberation within the room and thus improves sound quality.

If you are unsure which measure is right for your building, it is worth investing in a professional noise assessment.