This is not just a matter of acoustic discomfort, but a real business problem. Studies show that continuous noise reduces work performance, raises stress levels, and worsens employee well-being, while the lack of acoustic privacy demotivates people and lowers job satisfaction. From an ROI perspective, improving office acoustics can quickly pay off – less time lost to distractions, fewer errors and work interruptions, and lower employee turnover translate into measurable financial benefits. In this guide, we will look at why noise is the “silent killer” of productivity and what specific steps can be taken to regain calm and focus in an open-plan office.

Why is noise the silent killer of productivity?

Office noise has a real, measurable impact on team performance. According to Steelcase/Ipsos research, the average open-plan employee loses up to 86 minutes per day due to disruptions caused by noise and conversations. That is as if more than 1.5 hours of work effectively “disappeared” every day! No wonder that in a global survey, as many as 85% of people were dissatisfied with acoustic conditions, and 31% admitted that they have to leave the office to complete their tasks in peace. Noise reduces the ability to concentrate – employees in loud environments have shorter focus spans and make more mistakes. Worse still, returning to an interrupted task takes a very long time: a University of California, Irvine study found that after a typical distraction, it takes an average of 23 minutes to return to full focus. If there are many such distractions during the day, it is easy to calculate how many hours of productive work are lost each week.

It is not only about subjective feelings – the effects of noise are confirmed by hard data and scientific experiments. An experimental Activity-Based Working (ABW) environment study found that moving work from a noisy open-plan zone to a dedicated quiet zone improved cognitive test scores by 16.9%, and moving to a private room improved them by as much as 21.9% – which matched the noise-level difference (~15 dB(A) quieter outside the open space). This is tangible proof of how silence translates into better performance. Cognitive psychologists have even described a phenomenon called the “irrelevant speech effect” – merely hearing someone else’s conversation in the background significantly reduces memory and information processing ability, because our brain involuntarily processes the words it hears.

Long-term noise also affects employees’ physiology and health. Constant sound stimuli trigger the body’s stress response. Studies indicate that working in an environment with conversations (~50 dB) can raise heart rate and stress hormone levels, disrupting the nervous system’s rhythm. Moreover, chronic moderate noise exposure (e.g., the typical 50–70 dB(A) in offices) triggers a hormonal response similar to other stressors – elevated cortisol (the stress hormone) is observed, especially in people sensitive to noise. Scientists cited by Scientific American explain that excess cortisol impairs functions of the brain’s prefrontal cortex (responsible for planning, problem-solving, and emotional control). In the long run, noise can therefore lead to deteriorating health – higher blood pressure, sleep problems, and greater susceptibility to burnout. It is no surprise that noisy environments are sometimes cited as one of the reasons for “quiet quitting”, employees’ silent withdrawal from engagement in their duties.

It is worth noting that typical office noise levels (50–60 dB(A)) are far below the harmfulness threshold defined in occupational health and safety regulations – for example, the EU noise directive sets a limit of 87 dB(A) for 8-hour exposure and action thresholds starting at 80 dB(A). Offices rarely reach values above 70 dB, yet the cognitive decline effects described above still occur even at 50 dB. This shows that the problem is not hearing damage, but reduced productivity and comfort at noise levels formally considered “safe.” In other words, OHS standards protect us from industrial noise, but knowledge work also requires silence and the ability to focus.

What is most disruptive in the office? Sources of noise in open space

The main culprit of office distractions is… other people. Research consistently shows that coworkers’ speech in the background is the most distracting factor in open-plan offices. Our brain cannot “switch off” language – when we hear understandable words, they automatically capture attention and interrupt the internal “voice in our head” we use for thinking. The clearer and more intelligible speech is in the environment, the greater the interference with our working memory (this is precisely the essence of the irrelevant speech effect). That is why constant phone calls or discussions behind your back can effectively ruin a workday. Worse still, in open-plan offices, even without participating in a conversation, we become involuntary listeners – there are no walls, doors, and ceilings to dampen sound, so every word “carries” far.

The second category of distractors is sudden, unusual sounds, known as deviant sounds. This could be a ringing phone, a loud notification alert, a printer alarm signaling the end of a task, or someone loudly dragging a chair. Such sudden stimuli instantly capture our attention, because the brain interprets them as potentially important (an atavistic response to sudden signals in the environment). Even if the noise lasts only a second, concentration is broken – and once again, it takes time to return.

We also cannot forget the “background hum” generated by office equipment and infrastructure. The noise of HVAC systems (ventilation, air conditioning), the steady sound of computers and office devices, footsteps on hard flooring – all this creates an acoustic background that may seem insignificant, but raises overall noise levels. In particular, low-frequency humming from equipment is often cited as tiring and stress-inducing (people sensitive to noise feel it more acutely). In open space, these sounds add up – several sources at once create a continuous din.

The layout and design of open space itself further intensify the noise problem. Open space amplifies reverberation and makes sound propagation easier – the lack of sound-absorbing walls and ceilings means voices and noises bounce multiple times. Smooth, hard surfaces (glass, concrete, bare walls) act like acoustic mirrors: they reflect sound waves instead of damping them. As a result, a conversation between two people can be clearly heard many meters away, while numerous reflections add to the overall noise. Reverberation is the phenomenon of many reflected waves overlapping – a space with long reverberation “sounds” louder and less clear, because sounds overlap and create a hard-to-understand hubbub. 

Unfortunately, fashionable minimalist office design – concrete ceilings, glass walls, open ceilings, hard floors – promotes reverberation, because it lacks sound-absorbing materials. For example, bare glass or concrete have very low sound absorption coefficients, while soft materials (carpet, mineral wool panels) can absorb most acoustic energy. The less absorption, the longer the reverberation time (RT60) and the greater the reach of noise. That is why modern offices often look beautiful, but acoustically “ring” – all sounds reflect and carry throughout the entire floor.

In summary, noise in open space is a mix of conversations, equipment sounds, and poor room acoustics. Employees exposed to such conditions experience fatigue, frustration, and reduced motivation. Fortunately, there are effective ways to solve this problem – from simple organizational actions to advanced architectural solutions. Below, we present comprehensive noise-control strategies that can help restore calm and concentration in the office.

How to fight noise – strategies to improve office acoustics

Effective noise reduction in open space requires a two-track approach: on one hand, introducing organizational and cultural solutions (so-called soft measures), and on the other – modernizing the space acoustically (hard measures). It is important to treat office acoustics as an element of employee well-being and business efficiency, not just an aesthetic issue. Below we discuss both categories of solutions.

Organizational (soft) solutions

• Office noise etiquette: Establish and enforce basic rules of acoustic work culture. For example: “take phone calls in designated rooms or booths”, “mute notifications in open space”, “speak at a volume appropriate for shared space”. Clear rules regularly communicated to employees (e.g., in the form of an infographic on the wall) help build awareness that silence is a shared value. Educate the team that loud behavior has real consequences for coworkers and company results.
  
  

• Quiet zones and focus workspaces: If possible, designate a quiet zone in the office – a separated area (or separate room) for concentration-heavy work, where loud conversations and calls are prohibited. This can be a small “library” with a few desks or a section of open space partitioned off. The key is clear marking and enforcement. Employees gain a place they can retreat to in order to work quietly on difficult tasks. Research shows that providing this option genuinely increases efficiency (by the above-mentioned ~16–22%).
  
  

• Meeting policy and “focus time”: Analyze your company’s meeting culture – does every quick discussion really need to happen ad hoc at desks? Introduce good practices: limit spontaneous gatherings in open space, encourage booking meeting rooms or using text communicators. You can also designate meeting-free hours or days (e.g., Wednesday as a team-wide focus day). Such uninterrupted blocks let everyone work more deeply. Meta-analyses show that companies introducing “no-meeting days” report higher productivity and lower stress. Additionally, focus time blocked in calendars (e.g., daily 9–11 quiet time) sets expectations – during this period, unnecessary conversations are avoided.
  
  

• ANC headphones as ad hoc support: Encourage employees to use active noise-cancelling (ANC) headphones when they need special concentration. Modern headphones effectively reduce ambient noise. Of course, this is not a cure-all – we do not want a culture of mandatory all-day “working in headphones” – but as temporary support, it can be very valuable. It is important to treat headphones as complementary to other measures (they alone will not improve acoustics across the whole office, but they help the individual).
  
  

• Thoughtful team and workstation placement: Try to locate employees performing quiet, focus-intensive tasks away from noise sources. If part of the team mainly programs, analyzes data, or writes – it may be worth moving them to the end of the room or to the quiet zone mentioned above. Conversely, departments such as call centers, sales, or customer service (where there is a lot of talking) should be near meeting rooms or exits so they can easily step into a corridor. The goal is to minimize conflict between those who must talk and those who need silence. It has been proven that such spatial task segregation can increase employees’ cognitive performance by several to a dozen percent. The open-space layout itself also matters – avoid placing desks directly opposite each other across large areas (this creates long “sound corridors”). Better to break the line of sight – for example, by arranging desks in a slight zigzag or adding partitions between them.

Technical and architectural (hard) solutions

When it comes to physical space adaptation, the priority is improving the room’s acoustic properties so that the environment itself amplifies noise less. Key elements are sound-absorbing components (ceiling, walls, soft carpets) and solutions that block or isolate noise sources (partitions, booths). Below is an overview of the most important technical solutions:

• Acoustic ceiling – absorption “from above”: The ceiling is usually the largest flat surface in the office that reflects sound. Therefore, ceiling treatment gives the greatest effect in reducing reverberation. If the office has a suspended modular ceiling, it is worth replacing tiles with acoustic ones (absorption class A, NRC 0.8–0.9+). Such panels absorb most speech sounds reflecting upward, shortening reverberation time and improving speech intelligibility. In the case of an exposed concrete slab ceiling, a good solution is hanging ceiling islands or acoustic baffles – sound-absorbing panels suspended below the ceiling (horizontally as islands or vertically as so-called baffles). They diffuse and absorb sound coming from different directions, reducing both reverberation and the “distraction radius” of conversations (the distance at which someone’s speech can be clearly heard).
  
  The best islands/baffles made of mineral wool or melamine foam achieve very high absorption parameters – NRC up to 0.9–1.0 in the speech range. This means they absorb nearly 100% of the sound hitting them instead of reflecting it back. Installing such elements overhead reduces reverberant field energy in the room – noise no longer bounces endlessly between hard ceiling and floor, but is largely absorbed by the panels. This translates into a perceptibly lower background noise level and a smaller conversation distraction range. In practice, an acoustic ceiling is foundational – if the adaptation budget is limited, investing in ceiling absorption gives the broadest effects.
  
  

• Wall panels – absorption and diffusion on walls: Bare, large office walls are worth covering with acoustic panels to intercept some sound reflections “from the sides”. Different panel types are available – flat fabric-covered panels or three-dimensional structural panels.
  
  Flat foam, wool, or PET panels focus mainly on absorbing mid and high frequencies (the speech band), thus shortening reverberation and reducing reflections between parallel walls. They are especially effective for first reflections – so place them where, for example, speech would directly reflect off a large empty wall toward workstations. 3D panels (often with irregular surfaces) in addition to absorption introduce sound diffusion. The irregular texture causes reflected sound waves to break into smaller fragments and spread in different directions instead of focusing at one point. This helps reduce the “gymnasium effect” – sound does not “pool” in one place, but is dispersed more evenly and decays faster.
  
  3D panels are particularly useful with large glazed surfaces or long corridors, where they minimize noise focusing. Note: even visual partitions alone (e.g., cubicles, divider screens) can help somewhat – as a Steelcase study showed, adding even thin partitions (so-called cocoons) improved employees’ ability to maintain attention, because the psychological privacy effect itself reduces distraction. Therefore, partitions are worth using not only for acoustics, but also so that everyone does not have all office movement in their field of view.
  
  

• Soft flooring – carpet: Although ceilings and walls are more important for speech, the floor also plays an acoustic role. Hard flooring (tile, concrete, laminate) reflects sound and easily transmits impact noise (footsteps, heel clicks, dragged chairs). In turn, carpet flooring – especially carpet tiles with thick foam backing – acts like a giant floor absorber. It dampens footstep sounds and reduces reverberation by absorbing part of sound waves near the floor. Additionally, carpet improves inter-floor insulation, so if there is another space above the office, sounds do not “carry” as much through the slab. Manufacturer and acoustician studies show that flooring with sound-absorbing layers can significantly lower noise in heavily trafficked circulation paths. Even if replacing the entire floor is impossible, consider rugs or acoustic mats in key areas (e.g., under chairs in conference rooms or in relaxation zones) to at least partially reduce reverberation.
  
  

• Partitions, dividers, and phone booths: Physical space division is an effective way to limit noise propagation. Even if permanent walls cannot be built, there are mobile acoustic partitions on wheels and desk-mounted screens. Such solutions provide an immediate “block & absorb” effect – they create a barrier in the path of sound waves while also absorbing them, thus reducing direct speech intelligibility between workstations.
  
  It is important to choose partitions made of acoustic materials (e.g., high-density foam core covered with fabric) – decorative plexiglass screens will not help. A good practice is to place screens also along main aisles/corridors in open space so sound does not spread freely across the whole floor. Another solution is enclosed acoustic booths – single-person cabins for phone calls or small meetings. Modern booths offer insulation at 30 dB (acoustic class A/A+ according to ISO 23351-1), which means they practically eliminate speech leakage to the outside. An employee entering such a booth gets full privacy, and their conversation does not disturb anyone in open space. This is a highly effective way to “extract” conversation noise from open space – instead of silencing people (often unrealistic), we give them a comfortable place for loud calls or Zoom meetings.
  
  Even installing 1–2 booths per 50 people can significantly relieve the rest of the team. It is worth starting with a pilot: install one booth and see how intensively it is used (typically it quickly turns out to be occupied almost non-stop).
  
  

• Sound masking: An interesting technological solution to the noise problem is sound masking, i.e., masking speech with controlled background noise. Paradoxically, adding an extra neutral sound to the office can make the space seem quieter. A masking system emits specially designed noise (similar to a gentle HVAC hum) through hidden speakers, which masks part of speech sounds. When coworkers’ conversations become less intelligible against this noise, they become less distracting – the brain ignores them because it cannot extract clear words. Masking shortens the “distraction radius” – the distance over which someone’s conversation can pull attention away.
  
  A well-designed masking system is almost inaudible (it blends into the background; it does not sound like radio or an air conditioner, rather like a subtle noise that becomes unnoticeable after a while). Herman Miller and Harvard Business Review studies showed that implementing masking can increase productivity by up to 38% while reducing perceived stress by 27%. In many offices, sound masking proved to be the missing piece of the acoustic puzzle – especially where space cannot be built out or enough panels cannot be added, masking provides acoustic privacy in open-plan settings. Importantly, this technology is relatively affordable and quick to implement (much cheaper than, for example, rebuilding walls). Combined with the organizational and adaptive measures above, it delivers very good results.

ROI and business arguments – is it worth it?

Implementing the above solutions is an investment with solid business justification. For management, specifics are key: will a quieter office translate into better results? Available data and case studies clearly say – yes, in many areas.

• First, recovered working time: If noise takes an average of 86 minutes per person per day, reducing that loss by even half gives ~7 hours of work per employee per week! Across a team or entire company, this is a huge difference. Even shortening the time needed to regain concentration by a few minutes after each interruption yields hundreds more hours per year for key tasks. And the ABW studies mentioned showed a 16–22% efficiency increase after providing quieter conditions – as if in every 5-person team you “recovered” one full-time equivalent through better acoustics.
  
  

• Second, work quality and fewer errors: Quieting the office translates into fewer mistakes, higher levels of creative thinking, and faster execution of cognitive tasks. Employees can simply work in “flow” instead of constantly switching attention. This means better project quality, happier clients, and fewer costly corrections.
  
  

• Third, health and absenteeism: Less noise = less stress. Fewer people will experience burnout, and the number of sick days caused by headaches or blood pressure spikes will drop (such correlations with noise have been observed). A satisfied, well-rested employee works more efficiently and gets sick less often. This helps reduce hidden absenteeism and presenteeism costs (being at work in poor condition).
  
  

• Fourth, talent retention and work culture: Working conditions strongly influence employees’ decisions to stay with a company. If the office is friendly and supports concentration and well-being, people are less likely to look for a quieter place. In the era of hybrid work, many people prefer staying at home precisely because of office noise – a JLL report found that over 25% of employees cite noise and lack of focus options as the main reason for remote work. By improving acoustics, companies can encourage more frequent office attendance (because the office finally provides what was missing – the ability to focus). Better acoustics also mean less frustration leading to “quiet quitting” – when people feel the company cares about their comfort, morale is higher. As a result, turnover and replacement recruitment costs decrease.

And what about the costs of such improvements? ROI analyses for acoustic solutions look very favorable. For example, individual acoustic improvements often pay back within several months if they help recover even 2–3% of team working time. And this refers to only one solution – the cumulative effect of a package of changes (e.g., panels + booths + masking) can deliver much more than a 3% productivity gain. When we add soft benefits (better collaboration, fewer meeting interruptions, better client experience due to less background noise during calls), it becomes clear that acoustic investments are among the fastest-paying investments in employee well-being. Herman Miller estimates productivity increases of up to 38% after implementing appropriate acoustic solutions, and Soft dB calculates that cutting by a few minutes each of the frequent 23-minute post-distraction slowdowns yields huge savings at average wage rates. In short – adaptation costs are one-off, while gains accumulate day after day in the form of better team performance.

Where to start? Action plan – quick wins and long-term solutions

It is worth planning acoustic changes in stages. Not everything can (or should) be done at once – many improvements can be introduced quickly at low cost while testing their effect, and larger investments can be planned as part of a bigger project (e.g., office renovation or future CAPEX). Below is a suggested sequence of actions:

• Quick wins (low cost, immediate effect): Start with steps that cost nothing or very little, yet can improve the situation immediately. These include, among others, introducing noise etiquette and quiet zones (as described above), enforcing use of designated conversation areas (instead of holding talks in open space), setting up simple desk screens between workstations as a test, buying a few mobile acoustic partitions and checking where they are useful, piloting 1–2 phone booths on a floor, and even setting default “focus blocks” in team calendars so everyone has planned quiet work time. These actions can be taken immediately, without long analyses – you will feel their effect quickly while also gathering data on which solutions are most needed.

• Medium horizon (a few months): The next stage is moderate investments that can be delivered within a few months. Based on observations and noise measurements, decide where a sound masking system is most needed – e.g., in zones with the most phone conversations (high speech intelligibility). Consider a space layout change: can some desks be moved away from circulation paths, or can a focus zone be separated with half partitions? If ceilings are suspended, replace some ceiling panels with high-class acoustic ones where most people sit (sometimes you do not need to replace everything at once – e.g., every second tile). Additionally, add ceiling islands or baffles above the noisiest areas (e.g., above the sales open space or above the daily IT stand-up area). These medium-scale actions require some budget and planning, but are not as demanding as a full renovation – they can be done over a few weekends and deliver immediate improvement.

• Long term (CAPEX strategy): Ultimately, it is worth embedding acoustics as a permanent element of office space planning. During a major office modernization or relocation, plan a comprehensive approach: acoustic modeling of rooms (analysis of predicted reverberation time, speech intelligibility index STI, etc.) and based on that an adaptation design. Such a design should include a full set of solutions: top-tier acoustic ceiling (the foundation), walls covered with panels or diffusion elements, flooring made of sound-absorbing materials, proper space division (fixed partitions, glazed rooms, booths, niches), plus a masking system as fine-tuning. The long-term goal should be reducing speech intelligibility in open space to about 4–6 meters – so that a conversation a few desks away becomes only background noise, not a distracting dialogue – and shortening RT60 reverberation time to values recommended for offices (typically 0.4–0.6 s in the speech band). Such acoustic parameters are adopted in modern design guidelines and ensure the office supports intellectual work. Achieving them requires investment, but translates into lasting work comfort for years.

At each stage above, it is crucial to measure results and listen to team feedback. Acoustics may seem technical, but perception is subjective – so it is worth asking employees whether they see improvement, which places in the office are still problematic, etc. Sometimes a small change (e.g., moving a noisy printer) can solve a specific nuisance noise. Other times, it turns out an additional booth is needed because one is not enough. A culture of continuous improvement of working conditions will pay off in greater trust and engagement.

Acoustic solutions – cost vs. impact (for ROI decisions)

Legend: Relative cost: Estimated implementation cost of different solutions compared with one another. Impact: ★☆☆ moderate · ★★☆ high · ★★★ very high.