STL’s impact at Stride Treglown
How STL Is Making a Real Difference at Stride Treglown
Stride Treglown is an employee-owned architectural practice in the UK, founded in 1953. With over 300 specialists across nine studios, they provide multidisciplinary services in architecture, urban design, and planning.
At Stride Treglown, sustainability isn’t just a principle - it’s something built into everyday working life. Their Sustainable Travel Leave policy is a great example of how small changes can add up to meaningful impact.
We’ve just finalised their 2025 Impact Report, which shows how choosing lower-carbon travel options is benefiting both their people and the planet.
Turning Travel into Time Well Spent
Over the past year, colleagues claimed 42 sustainable travel days, visiting 25 different destinations by choosing alternatives to flying.
The total time claimed for sustainable travel in 2025 equated to 3.7 minutes per employee per month.
A Measurable Environmental Impact
The environmental benefits are significant.
In 2025, colleagues at Stride Treglown saved over 35,000kg of CO₂e by travelling more sustainably. On average, each journey avoided around 836kg of CO₂e - alongside other harmful impacts of flying, such as contrails.
To put that into perspective, this saving is equivalent to:
The carbon stored in a woodland the size of three football pitches
Nearly 1,400 mature trees absorbing CO₂ for a year
The emissions from producing 350 tonnes of concrete
The carbon footprint of heating a UK office for 18 months
Running 2,000 office computers continuously for a year
These comparisons show just how powerful individual travel choices can be when multiplied across a whole organisation.
Why This Matters
In the built environment sector, their work shapes the future of towns, cities and landscapes. So it’s great that they also look closely at how they operate as a business.
By embedding sustainable travel into their policies, they are:
Reducing their operational carbon footprint
Supporting employee wellbeing
Encouraging slower, more meaningful ways of exploring the world
Showing that climate action can be positive and rewarding
Looking Ahead
John Wright, Director for ESG, said
“The results from 2025 show that Sustainable Travel Leave is working. It’s delivering measurable carbon savings, enriching colleagues’ experiences, and strengthening our culture of responsibility.
As we move forward, we’ll continue to build on this success - encouraging more people to choose low-carbon travel and proving that workplace policies can be a powerful tool for climate action and employee wellbeing.”