Onion Flats

We're an architecture firm with a passion for cost-effective, climate-resilient, healthy buildings and communities. Onion Flats Architecture's focus on community development, multidisciplinary thinking, and making, high-performance building technologies, and alternative construction methodologies has won the firm national and international awards. Featuring the R&D Award from Architect Magazine, the Green Building United's Ground Breaker Award, the ULI Willard Rouse Award for Excellence, the International Passive House Award, the ULI Global Award of Excellence, and the Emerging Voices Award by the Architectural League of New York.

Our Services

Our services range from multi-family and single-family residential design to institutional and master planning projects. We specialize in deep energy retrofits, ensuring that our buildings are not only aesthetically pleasing but also environmentally sustainable. Our team of experts is dedicated to creating healthy, resilient, and cost-effective buildings that benefit both the environment and the community.

Meet the Team

Timothy McDonald, our Principal, is a licensed architect in Pennsylvania and New Jersey. He has extensive experience in architecture, construction management, and community development. Howard Steinberg, another key member, is also a registered Architect in several states and has expertise in LEED and Passive House design. Together, they bring a wealth of knowledge and passion to every project they undertake.