How to fix echo in a glass-walled meeting room

Glass-fronted meeting rooms and executive cabins look modern and let light in. They also create one of the most common complaints we hear: “it echoes, and people on Teams or Zoom cannot hear us.” The cause is reverberation: too many hard surfaces and not enough absorption.

Why glass rooms echo

• Parallel hard surfaces: glass on one side and a hard wall opposite bounce sound back and forth.
• Hard ceiling and floor: gypsum ceilings and tiles add more reflections.
• The table: a large hard table reflects voices up into the ceiling.
• Microphones hear the room: conference microphones pick up the echo with the voice, so remote people hear a hollow sound.

Step 1: treat the ceiling

The ceiling is the best place to start because it is large and out of the way. Replace plain tiles with high-absorption acoustic tiles, or hang an acoustic cloud over the table. This also catches the reflection between the table and the ceiling.

Step 2: treat any solid wall

Add panels on the solid walls, especially the wall opposite the screen and the wall behind the chairman. Fabric, PET or timber slat panels can match the interior. See acoustic panels and materials.

Step 3: soften the floor

Carpet tiles or a large rug under the table reduce footfall and chair noise and add some absorption. See carpet tiles and flooring.

Step 4: the glass itself

Clear glass cannot absorb sound, but angling a new partition slightly, or adding fabric blinds where privacy allows, reduces flutter between parallel surfaces. If the problem is also privacy, upgrade to laminated or double glazing with sealed doors.

Step 5: the audio system

Once the room is treated, a well-set conference microphone system with echo cancelling works far better. Treating the room first saves money on the audio, because the microphones no longer fight the echo.

Typical targets

For meeting rooms used for video calls, designers often aim for a reverberation time of roughly 0.4 to 0.6 seconds, depending on the size of the room. We measure the room before and after so you can hear and see the difference. See conference room soundproofing for the full process.

Common mistakes when fixing echo in glass rooms

• Buying a better microphone first: the microphone will still hear the room. Treat the room, then tune the audio.
• Treating only one wall: glass on one side and a bare wall opposite still bounce sound between them. Spread treatment across the ceiling and solid walls.
• Thin decorative panels: very thin panels absorb only the highest frequencies, so voices still sound boomy. Check the absorption data. Our guide to NRC explained shows how.
• Confusing echo with privacy: treatment makes speech clearer inside, but it does not stop people outside hearing. For privacy, see commercial soundproofing materials and STC ratings.
• Ignoring the air conditioning: a noisy cassette unit above the table can be picked up on every call. See soundproofing HVAC ducts and air vents.

What a site survey checks

• The size and shape of the room and how much of it is glass.
• The ceiling: plain gypsum, tiles or exposed slab, and whether the partitions reach the slab above.
• The floor finish and the size and material of the table.
• The audio and video setup: screen, camera, microphones and loudspeakers.
• Reverberation, measured with a simple test, and background noise from the AC and corridor.
• The interior design, so the treatment matches the finishes.

Step by step: a typical glass meeting room project

1. Listen and measure the room as it is, including a test call.
2. Agree a target reverberation for the room size and use.
3. Design the treatment: ceiling tiles or a cloud, wall panels on solid walls and a floor finish. Our acoustic panel placement guide explains where each piece goes.
4. Check privacy: head of partition, door seals and glazing, if conversations are heard outside.
5. Install, usually in a day or two for a single room, out of hours where needed.
6. Tune the audio once the room is treated, then re-measure.

How to choose finishes that suit the interior

• Fabric panels: wide colour range, can carry a logo or print, good absorption.
• PET felt: clean modern look, shapes and patterns, robust in busy rooms.
• Timber slats: warm finish for boardrooms and executive cabins.
• Acoustic ceiling tiles and clouds: almost invisible, and the most effective single step.

Applications by building type in Pakistan

• Corporate offices and software houses: glass meeting rooms used all day for video calls.
• Banks: glass cabins for managers and client meetings, where clarity and privacy both matter.
• Government offices: conference rooms with hard finishes and large tables.
• Universities: glass seminar rooms and faculty meeting rooms.
• Open-plan floors: glass rooms are often part of a wider plan. See open-plan office noise reduction.

If the room faces a busy road, the glazing may also need upgrading. See acoustic glazing vs double glazing.

Why video calls make echo worse

In a face-to-face meeting, our ears and brain filter out much of the room. A microphone cannot do that. It records the voice and every reflection that arrives a fraction of a second later, and sends both to the far end. Remote participants then hear a hollow, distant sound, and echo cancelling in the audio system has to work harder, which can make voices sound clipped or uneven. The further people sit from the microphone, the more of the room it hears, so long boardroom tables suffer most.

Reducing reverberation shortens that tail of reflections. Voices sound closer and clearer, the echo canceller has less to remove and people stop raising their voices to be understood, which also lowers the noise heard in the corridor outside.

Quick checklist before a survey

• How many people use the room, and how often is it used for video calls?
• Is the main complaint echo inside, or being overheard outside, or both?
• What is above the ceiling: does the glass or the wall stop at the false ceiling?
• Where are the screen, camera, microphones and loudspeakers?
• Are there finishes the interior designer wants to keep?
• Can work be done out of hours or at weekends?

Having these answers ready makes the survey quicker and the proposal more accurate.

Frequently asked questions

Can I fix echo without removing the glass?

Yes. Most of the fix goes on the ceiling, the solid walls and the floor. The glass stays.

Will panels make the room look cluttered?

No. Ceiling tiles and clouds are almost invisible, and wall panels come in fabric, PET and timber finishes that suit the interior.

Why do people on video calls hear us badly?

The microphones pick up the echo with your voice. Treating the room makes the audio clearer for remote participants.

Does this also stop people outside hearing us?

Echo treatment improves clarity inside. For privacy you also need sealed doors, laminated or double glazing and a treated ceiling void.

How long does it take to treat one meeting room?

For a single room, installation usually takes a day or two after the survey and design. We can work out of hours so the room is not out of use.