Someone two desks over takes a call. You don't mean to listen, but the sentence you were halfway through writing is gone, and it takes longer than it should to find it again.
There's a number for workplace noise in UK law. It's nowhere near what just happened.
The Law Protects Your Hearing. Not Your Attention.
Under the Control of Noise at Work Regulations 2005, UK employers have specific duties once noise exposure crosses three thresholds: 80 decibels, where employers must assess the risk and provide information and training, 85 decibels, where they must provide hearing protection, and 87 decibels, an exposure limit that must never be crossed at all.
The Health and Safety Executive is plain about what those numbers are for. They exist to protect workers' hearing from permanent damage and tinnitus, not to protect anyone's ability to concentrate. An ordinary office, even a loud one, rarely gets near 80 decibels. The law's attention stops long before the volume most people actually work at.
What a Controlled Study Found, Far Below That Number
In 2011, researchers published a study in the Journal of Environmental Psychology that put 47 university students through two separate working sessions in a simulated open-plan office, one at 39 decibels and one at 51 decibels, both far quieter than the point where UK law even starts asking questions. The only thing that changed between sessions was the background noise.
At the higher of those two ordinary office volumes, people remembered fewer words, rated themselves as more tired, and described themselves as less motivated to keep working. Nothing in either session came close to a hearing-damage risk. The difference was twelve decibels, roughly the gap between a quiet room and a normal conversation, and it was enough to measurably change how well people could hold information in mind.
This was a lab study, not a real office, and the people in it were Swedish students, not UK office workers. Both of those limits are worth stating plainly rather than letting the headline number stand alone.
What a Larger, Real-World Survey Found
A separate study, published in 2019, asked over a thousand office workers across nineteen companies how background speech actually affected them day to day. Workers in open-plan offices reported noticeably more annoyance from overheard conversation than workers in shared, smaller offices, and they rated their own concentration as more affected by it, a difference the researchers found unlikely to be down to chance.
This was self-reported, not a measured test, and the workers surveyed were in Italy, not the UK. It's a different kind of evidence from the first study: larger, more realistic, but less precise about cause and effect. Taken together, a controlled study and a real-world survey point in the same direction without either one proving the whole picture alone.
What This Doesn't Tell Us
It doesn't tell us how loud any specific office actually is, or that anyone should buy noise-cancelling headphones or redesign a floor plan on the strength of two studies. It doesn't tell us anything about hydration, caffeine, or what any drink does to attention near a noisy desk. Both studies measured background sound and either working memory or self-reported disruption, nothing else, and that's exactly as far as they should be read.
What they do say, taken together, is that the number UK law actually enforces and the number where concentration starts to slip sit a long way apart, and that gap covers the entire range most people spend their working day in.
Why 0800Labs Is Interested
This is the same ground as our pieces on workplace temperature and indoor air, looked at through a third window: a legal limit that exists for a real reason, set well above the point where something quieter is already happening to the people in the room. Not the heat. Not the air. The sound itself, at a volume nobody would call dangerous, doing something nobody in the room is measuring.
We call the occasion underneath all of this Workday Hydration. It's our own term, not an established category, and not a claim about what either study found, or about what any drink does to a noisy room. It names the moment we're interested in: the one that gets built for a desk day, whatever's actually happening around it.
We're building something for that moment. If that's useful, the waitlist is below.