Karla Butterfield

Karla Butterfield, Sustainability Director

Karla Butterfield

LEED AP Homes, Phius Certified Verifier

Sustainability Consulting

Sustainability Director

Steven Winter Associates

Somerville, MA

  • 1.4M GSF
  • 6 Projects
  • 32 Year Career


Karla brings an enthusiastic approach to improving our built environment. She is passionate about carbon accounting and the health and well-being of building occupants. For more than 30 years she's been dedicated to advancing high-performance and occupant health. 

Karla is a Sustainability Director at Steven Winter Associates, Inc., working with residential buildings. Her expertise is in sustainable consulting services, program certification support and implementation of high-performance building technologies. With architects, developers, builders, and homeowners, she develops specific sustainability strategies for both new construction and renovations. Karla participates with several working groups, including RESNET's Embodied Carbon Standard and the NGBS Development. She is also a Board member for SWA, and EEBA. She's also actively promoting workshops, trainings, and education by participating as a Next Gen mentor, and juror for the Solar Decathlon competition, ZERH awards, CTGBC and AIA CT awards.


Building Types

  • Mixed Use
  • Residential: Affordable Multi Family
  • Residential: Multi-family

Achieved Project Certifications

  • LEED
  • Living Building Challenge


CT Green Buidling Council's 2020 Green Advocate Award and NGBS Partner of Excellence (2016-2022). 

SWA- Indoor airPLUS leader award 11 years consecutively.



Evan Fink, Dakota Partners. Karla and her team at Steven Winter Associates were critical to our success at Columbus Commons and now, again at Woodland Cove. She helped us navigate the PHIUS, LEED v4 and Energy Star process through design and construction and is a pleasure to work with. 

Todd McClutchy, JHM Group. At JHM, we understand that, in addition to being affordable, all housing must provide safety, sustainability and a sense of well-being for its residents. Steven Winter Associates' team, led by Karla Butterfield has been instrumental to our success in the Energy Star, LEED, Indoor airPLUS, and Passive House programs. We look forward to designing towards and achieving continued success with SWA.