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Healthy Building Science

Healthy Building Science

USGBC member

601 Van Ness
Suite 305
San Francisco, CA 94102


Service area: 200 miles

Service Area: We provide services all across the country, although the majority of our residential clients are within 100 miles of the San Francisco Bay Area.


Green building consulting, Healthy Building Inspections and Environmental testing with special emphasis on occupant health. We offer supporting documentation for many green building rating systems such as LEED, GreenPoint Rated and Green Guide for Health Care. Our environmental testing and inspecting services cover air, water, soil quality, bulk materials and even electromagnetic field surveys. We commonly evaluate homes (sites, and other buildings) for contaminants and provide specific recommendations for remediation where necessary.

Few designers and contractors have mastered green building rating systems – and even fewer have a deep understanding of healthy buildings or take a whole-building systems approach to smart design. Important issues such as controlling moisture and mold, allergens, volatile organic compounds (VOCs) and electromagnetic radiation (EMF), are often neglected during design and construction, when proactive mitigation efforts are easiest and most affordable.

We streamline the green building rating process (e.g., LEED or GreenPoint Rated), and while most consultants focus just on energy efficiency, we specialize in identifying simple and practical solutions for improving Indoor Environmental Quality (IEQ) as well. Some of the Green Building services we offer include:

Building Envelope Commissioning (BECx)
Building Performance Testing from certified BPI analysts including Blower door and Duct Blaster testing
Building Science Technology
Energy Auditing & Energy Modeling
LEED Consulting during Design & Construction
LEED IAQ testing.
GreenPoint Rated (GPR) for New or Existing Single or Multi-Family projects.
Building Biology Assessments
Healthy Building Materials Selection-we've done the research and will continue to source the best options for your environmental goals.

Healthy Building Inspections

Environmental healthy building inspections are our specialty. Let us inspect and test your building to provide you with answers. We collect samples, coordinate and interpret laboratory services, share our findings in a user-friendly report, and suggest practical and affordable mitigation strategies. Few companies can offer such comprehensive services all in one stop. Healthy Building Science has well trained and responsive environmental inspectors that can inspect and test:

Air Quality
Building Biology
Electromagnetic Field (EMR/EMF) Pre-purchase, Basic or Advanced.
Lead Clearance Sampling
Moisture & Mold with Mold Remediation Protocol (MRP)
NEHA/NCHH Healthy Home Inspection - developed by the National Environmental Health Association and National Center for Healthy Homes. Includes broad based categories such as keeping the building clean, contaminant-free, dry, pest-free, maintained, and safe.

Our environmental assessments are complete. From the basement and crawlspace to the attic and roof. We combine the principles of Building Biology AND Environmental Science.


We have been involved 25+ LEED-NC projects, 3 Green Guide for Health Care projects, and numerous green home remodels - from complete gut to minor retrofits.

We have years of experience working for cutting-edge green building consulting firms, numerous certifications, and graduate degrees in environmental science.

Our methods, equipment, and reporting are top notch and we have a healthy list of satisfied clients.


Alex Stadtner, Owner and Founder; LEED-AP, Building Biology Environmental Consultant, Certified Green Building Professional, Masters of Science - Resource Conservation and Management, BA - Environmental Science & Studies.

David Sasse, Environmental Inspector. David comes to Healthy Building Science with a background in all phases of property development and management. David has worked with architects, planners, designers & contractors and property owners giving him a deep practical understanding of building technology and environmental science. He has also performed environmental inspections in industrial, commercial, and residential settings. This knowledge of building construction and environmental science makes for a unique blend, and enables David to identify problems in buildings sometimes before they are even visible! David holds two degrees from the University of CA at San Diego, one BS in General Biology/Biochemistry, and a BA Major in Music Performance with a minor in Economics.

Kunjan Shah, Architect, LEED AP, BD+C, Building Envelope Commissioning Agent, (BECxA). Kunjan is a licensed architect and has a tremendous passion for building design and construction. Over the last 16+ years she has had the opportunity to work on many different types of building projects including commercial, educational and residential. She has made it her mission in life to use her skills to transform existing buildings into resource efficient, healthy citizens of the built environment, in economically viable ways.
She is an active member for the Environmental Initiatives Committee of Los Altos Hills, assisting the City Council with issues concerning environmental legislation and residential construction in the town.
Certifications: Bachelor of Architecture, LSR School of Architecture, India. Licensed Architect, State of California, Leadership in Energy & Environmental Design (LEED) Accredited Professional by the United States Green Building Council (USGBC) BD+C, EBOM. Member: USGBC Silicon Valley Programs Committee.

Darrell Sommerlatt, M.S, LEED AP, Green Building Consultant. Darrell is a Green Building Consultant and LEED AP with postgraduate qualifications in Environmental Management from University of Maryland. Darrell integrates innovative environmental design strategies whilst coordinating with designers, clients and building owners. Using his experience, as well as GreenPoint Rated, LEED and LBC guidelines projects are guided to deliver best practice outcomes.

Brian Liston, GreenPoint Rater & Advisor, Green Building Analyst. Brian has over 25 years of experience in residential construction management and multi-family housing development. He was involved in the development of Rising Sun Energy Center's Green Energy Training Services (GETS) curriculum. Brian became the Lead Instructor for the GETS program at the City of Richmond. Brian is a Build it Green certified trainer and green building professional (CGBP), GreenPoint Rater

Alex Stadtner created Healthy Building Science after more than a decade as an environmental scientist and green building consultant.

The company has grown into a thriving small business since its founding in 2009. Environmental Testing, Healthy Building Inspections and Green Building Consulting empower our clients to create more healthy environments.

Healthy Building Inspections and Environmental Testing often go hand-in-hand. High tech testing equipment and expert knowledge of construction techniques, building science, and environmental science enable us to identify contaminants and help create healthier existing buildings.

Green Building Consulting may include anything from guiding commercial design/build teams through the LEED or GreenPoint Rating process to helping families select healthy finishes for a nursery or kitchen remodel.

Healthy Building Science will discover the best path to create a healthy, safe, and comfortable environment.

U.S. Green Building Council Member
U.S. Green Building Council Member

The U.S. Green Building Council is a 501(c)(3) non-profit community of leaders working to make green buildings available to everyone within a generation. More...