Mission & Team

New building codes and green building programs can be confusing. We provide architects, owners, and builders with the information needed to make smart choices for their residential and commercial construction projects. Whether working on a remodel or new construction, we support our clients through the entire process to ensure the project achieves required building code compliance and any desired certifications, all with health, comfort and quality in mind.

We stay abreast of the cutting edge of building science to always provide our clients with the most up-to-date recommendations. We know the challenges when building super-insulated homes and high-efficiency buildings, and will help you make the best decisions for the health and comfort of the occupants.

Get to know our team below, or schedule a free 30-minute consultation call with us.


Mark Bloomfield
Principal | Mechanical Engineer | HERS Rater

Mark headshot NEWFollowing his work at Alpen, Mark joined LEED® Management Services, a Boulder firm that manages and coordinates the LEED (Leadership in Energy and Environmental Design) process for clients that seek LEED® certification.

Mark joined the Sustainably Built team in early 2008, and performs HERS® ratings, Manual J Residential Load, Manual D Residential duct calculations, and provides energy modeling services with e-Quest, REM/Rate and EnergyPlus. Becoming a Principal in Sustainably Built in 2009, Mark continues to push innovation in building science and green building, with an increased focus on Net Zero construction.

In his spare time, Mark enjoys hikes with his dog, working on his home in Sunshine Canyon, and geeking out on his own personal growth.


Adam Stenftenagel
Principal/Founder | HERS Rater

Adam entered the field of green building in early 2004 as a founding Board Member of the Boulder Green Building Guild. Adam led a successful campaign to bring FSC (Forest Stewardship Council) certified dimensional lumber to Boulder, and remodeled two housing co-operatives with green building techniques. With the Center for ReSource Conservation, Adam managed the ReSource yard, pioneering several recycling programs. Adam was an advisor to the development of Boulder County’s Build Smart program, and helped craft the deconstruction and recycling requirements for the City and County of Boulder.

In the summer of 2007, Adam founded Sustainably Built. He has consulted on numerous cutting-edge projects, including net-zero energy homes and the unprecedented cost-neutral net-zero energy development GEOS. Adam is also the founder of Snugg Pro, a software company that builds sales tools and modeling software for home performance contractors who retrofit existing homes for energy efficiency and renewables.


Andy Mazal
BPI Building Analyst | LEED AP | HERS Rater

Andy entered the field of green building and home energy consulting after a career in international marketing and channel development. It was the latter activities that led to a growing interest in the built environment and how it could be made more effective and less impactful. In 2008, Andy launched his own company focused on energy consulting and analysis. Since that time, he has worked as an energy auditor, HERS rater, and building consultant for hundreds of single family, multi-family and smaller commercial projects, both new construction and remodels or renovations. He also served as Program Manager for a County-wide energy efficiency program (EnergySmart).

He is a certified as a BPI Building Analyst, RESNET HERS Rater, LEED-AP, Energy Star rater and is also a Certified Thermographer. He has extensive experience in diagnosing problems with buildings and directing effective energy efficiency solutions. In the commercial field his experience spans diverse projects ranging from high-rise ski resort condo buildings to restaurants and retail. He has certified dozens of projects under programs such as LEED and Energy Star.

He holds a BBA from Southern Methodist University in Dallas, TX and a MBA from the Thunderbird School of Global Management in Glendale, AZ. His experience and education give him a unique ability in being able to understand a client’s perspectives and priorities in providing them realistic, effective advice.


Nikola Pejovic
Building Energy Analyst

Nikola head shot crop

Nikola graduated from University of Vermont with a Bachelor of Science with a degree in Environmental Sciences, concentrating in Ecological Design. Nikola is a certified BPI Building Analyst with experience in combustion appliance safety testing, blower door and duct blaster analysis on both residential and multifamily buildings.

Nikola spent 2-years as an Energy Advisor at CLEAResult working on residential energy efficiency programs on behalf of municipalities and utilities. Nikola also has experience in commercial energy efficiency, working to reduce energy use throughout the production line of a brewery.


Hank and his old sweetheart, Kylee
Hank opted out of receiving email!doggies2

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