The Numbers Are In: Healthy Workplaces Outperform on Every Measure That Matters

There is a question I get asked a lot by developers, corporate tenants and workplace designers: Is WELL certification actually worth it? Does designing for human health translate into anything measurable, or is it just a premium feature that sounds good in a brochure?

A major new study just answered that question, clearly.

Published in May 2026, research led by Panasonic Electric Works (Panasonic EW) in collaboration with the International WELL Building Institute (IWBI) drew on more than 4,200 occupant surveys across 41 office projects in Japan, making it one of the most comprehensive post-occupancy analyses to date of how health-focused buildings translate into measurable outcomes. (1)

The results are significant, and if you work in property, architecture, or corporate real estate, they deserve your attention.

What the study found

Employees in WELL-Certified workplaces reported a 19% increase in overall well-being and a 20% increase in perceived work engagement compared to those in non-certified buildings. (2)

Those are not marginal gains. That is the kind of difference that shows up in retention figures, sick leave rates and productivity metrics.

When the researchers looked specifically at the indoor environmental quality factors most linked to human health and performance, the picture became even more compelling.

WELL Certified offices showed significantly higher satisfaction across access to nature (+36%), water quality (+26%), indoor air quality (+23%), sound environment (+21%), speech privacy (+21%), thermal comfort (+20%), natural light (+18%) and lighting environment (+13%). (2)

What I find particularly important here is that these are exactly the factors we know from building biology and environmental health research to have a direct physiological effect on people. This is not about aesthetics or perceived luxury. Air quality affects cognitive function. Acoustic comfort reduces cortisol. Natural light regulates circadian rhythm.

The science has been there for decades, and this study is quantifying it at scale.

It is not just about the fit-out

One of the most telling findings is this: WELL Certified offices outperformed recently renovated non-certified offices by 10% in well-being and 8% in engagement, underscoring that renovations alone fail to deliver the same gains. (2)

This matters enormously in the Australian market right now, where there is significant investment in workplace refurbishment under the banner of "employee experience."

A new fitout with nice finishes is not the same as a building designed and verified to support human health. The certification process matters because it requires evidence, not just intent.

What is actually driving the outcomes

The study did not stop at measuring outcomes. It used regression modelling to understand the underlying drivers. Key factors related to refreshing and recharging were the strongest contributors to perceived well-being, accounting for 31%, followed by team culture at 16%, indoor environmental quality at 15% and design at 14%. A similar pattern emerged for work engagement, with refreshing and recharging accounting for 18%, team culture for 14%, and design for 14%. (2)

This reinforces something I speak about often with clients: a healthy workplace is not just about air and light. It is a system.

Physical conditions, social dynamics and design choices operate together. The design factors also include the teamwork environment, highlighting the importance of workplace design in supporting collaboration and employee experience.

The broader picture

Beyond the indoor environment, employees in WELL-Certified spaces reported higher satisfaction with privacy, psychological safety, social connection, and opportunities to rest and recharge throughout the workday. Interior design factors, ranging from layout and furnishings to cleanliness and operational policies, also scored higher, pointing to a more comprehensive and supportive workplace ecosystem. (2)

As IWBI President and CEO Rachel Hodgdon put it: "The findings send a powerful message to organisations everywhere: investing in health is not a cost but a catalyst for stronger performance, deeper engagement and greater organisational resilience." (2)

Why this matters for Australia

WELL Certification is growing in the Australian commercial sector. Still, it remains underutilised relative to its potential, particularly among mid-market developers and corporate tenants who assume the cost is not justified. This study provides a direct, evidence-based answer to that assumption.

If you are a developer, builder, or business owner thinking about your next project or your current lease renewal, this research is worth sharing with your team and your investment committee.

The evidence for designing with human health at the centre has never been stronger. And the cost of not doing so is becoming increasingly visible in the data.

Source: Panasonic Electric Works Co., Ltd. and IWBI, May 2026. Full study available here