About Us
We were established to transform built environments, helping humanity survive and thrive in today’s polluted world.

Our clients include architects, designers, and agencies working in the built environment and organizations that want to enable themselves to face an uncertain future with new capacity.

We landed on the name, “AFFECTINGCHANGE,” because we are well known for our ability to “affect” the design process and for revealing the opportunities for making conscientious choices.

We are a powerful mountain standing in the landscape—standing for what is possible for humanity. Everything else—the wind, the water, the air—moves around us. Our clients do the change in the world and we enable and empower them to stand, like a mountain, for what is possible.

We enable organizations to create facilities that enable them to accomplish their mission and purpose, while minimizing their impact and while possibly even enabling ecosystem restoration and making a positive social impact.

Sandra Leigh Lester


Founder and CEO


Sandra grew up in southwestern Ontario and during summers on construction sites on Manitoulin Island. When she was just eleven years old her life changed—she went to help out after an F4 tornado hit her city. It was this experience that connected her emotionally to the doomsday predictions of more frequent severe weather events—a reality that we must all face in the 21st century.

Sandra is trained in architectural science, change management and organizational development. She is a registered Designer for interior spaces and small buildings. She has a passion for wellness, health and fitness. She is a LEED-accredited Professional and taught the LEED-accreditation prep course for HOK Architects. She is a Certified Sustainable Building Advisor and taught the Certified Sustainable Building Advisor course for the Canada Green Building Council.

Sandra has a passion for humanity and the diversity of cultures in Toronto. She was trained as a Climate Reality Leader by Al Gore and has worked tirelessly as an advocate for climate change solutions including serving as the volunteer Community Engagement Leader for the Riverdale Pilot for Project Neutral.


Bachelors of Technology in Architectural Science, Ryerson University
Masters Certificate in Organization Development, Schulich


Certificate in Change Management from the Canadian Organizational Development Institute (CODI)
NCIDQ-certified and Registered Interior Designer (ARIDO IDC)
LEED-Accredited Professional in Building Design and Construction (LEED AP BD+C)
Certified Personal Trainer Specialist (PTS)
Certified Sustainable Building Advisor (CSBA)

Consultant to:
• HOK Architects
• Perkins+Will Architects
• LAT49 Architects
• Colleges Ontario
• The Atmospheric Fund
• Ministry of Environment and Climate Change
• Ministry of Health and Longterm Care
• Ministry of Infrastructure 
• Humber River Hospital
• Shorefast Foundation (Fogo Island Inn)
• The City of Toronto
• The Government of Ontario
• The Government of Newfoundland and Labrador

Aided in the selection of various synergistic retrofit strategies for the $500 million Low-Carbon Innovation Fund for the retrofit of College and Universities across the Province of Ontario.

Teaching Experience

• Visiting Professor and Adjunct at the University of Manitoba
• Lead Instructor, Certified Sustainable Building Advisor Course, Canada Green Building Council
• Part-time Instructor, University of Technology Sydney (UTS)
• Part-time Instructor, Ryerson University
• Part-time Professor, Centre for Construction & Engineering Technologies, George Brown College


Let's Work Together

Let’s put our experience to work for you.

Contact Us