In the heart of London, a quiet revolution is brewing against one of the most overlooked health hazards in modern homes: mould. The culprit may be silent, but the consequences are loud—respiratory problems, chronic fatigue, skin irritation, even mental health implications. And now, one startup is determined to do something about it.
Untold Mould is the new health-focused venture from entrepreneur Hermione Olivia, best known for her work with CEO Yourself. Her latest project turns the spotlight onto indoor air quality, offering a sleek, consumer-first solution to a common but under-discussed issue: toxic mould living in the air we breathe.
The Hidden Crisis
Up to 27% of homes in the UK are thought to be affected by mould—whether visible on bathroom tiles or hiding deep within ventilation systems. Its spores spread quietly, often with no smell or visible trace, but their impact can be profound. From exacerbating asthma to weakening the immune system, the consequences of long-term exposure are increasingly recognised by scientists and healthcare professionals.
Still, testing for mould has traditionally been a costly, inaccessible and opaque process—one that leaves most renters and homeowners shrugging off damp patches and stale air as something to live with. Untold Mould believes that shouldn’t be the case.
A Simpler Solution
The brand’s flagship product is a three-step at-home testing kit, designed to be as intuitive as taking a COVID swab. You simply order the kit, test the air in one to three rooms using the provided equipment, and send your samples back in the pre-paid return box. Results are turned around in just a few working days, delivered through a slick digital portal.
Crucially, the results aren’t just binary—Untold Mould’s proprietary AI system delivers clear, personalised feedback. Customers are guided through what mould types were found (if any), the risk level, and what steps they can take to improve their indoor environment. It’s diagnostic, educational and empowering all at once.
A Personal Mission
For Hermione Olivia, this isn’t just about disrupting a stale industry—it’s about building something meaningful. With a background in wellness and tech, she saw an unmet need: millions living in environments that are quietly undermining their health, without the tools to understand why.
“Your home should be a place of safety and healing,” she’s said in interviews. “But for too many people, it’s unknowingly making them sick. We want to change that.”
The brand has also started whispering about what comes next: partnerships with housing associations, landlords, even real estate agents looking to prioritise wellness in the home-buying process.
Untold Mould might be a small startup, but its ambitions are big. By tackling what we can’t see—and often don’t think about—it’s quietly reshaping the conversation around how we define a healthy home. And if its momentum continues, it won’t stay “untold” for long.
