Lead Instructor & Curriculum Developer
Owner, Accessory Dwelling Strategies LLC
Founder, AccessoryDwellings.org
Author, Backdoor Revolution
Kol is the owner of Accessory Dwelling Strategies LLC, a company dedicated to ADU-related education, advocacy and consulting. He edits and manages accessorydwellings.org, a website that addresses ADU policy issues and features an array of ADU projects. Kol also wrote the book on ADUs, Backdoor Revolution: The Definitive Guide to ADU Development, runs Portland’s city-wide ADU tour, offers homeowner-focused ADU courses, and delivers ADU education, speaking and consulting for a variety of audiences.
Kol is the lead instructor & curriculum developer of the ADU Specialist training and accreditation program.
DIRECTOR
Kol Peterson
Ozi Friedrich is the founder and principal architect of Radix Design, LLC, a small firm based in a historic Denver neighborhood. Ozi designed their first ADU in 2006 and made ADUs a focus of their practice after founding Radix in 2016. Their work focuses on contextually sensitive, compatible ADU designs that are great to live in despite zoning, landmark, or other restrictions. Their work includes the custom design of at least 20 ADUs, including examples of attached ADUs, basement ADUs, and a garage conversion. They are also architect of record for the West Denver Renaissance Collective pre-designed ADU program, and have brought 16 designated affordable ADUs through Denver permitting as part of the program.
Since founding Radix, Ozi has advocated for improvements in ADU zoning, design guidelines, and building codes. Their career has spanned from a time when ADU construction was nearly impossible to the current moment where statewide legislation promises to make ADUs a key strategy in resolving Colorado's housing crisis.
DESIGN
Ozi Friedrich
With 19 years of experience in real estate, Sarah Senderhauf specializes in ADUs, leveraging her expertise to navigate Denver’s complex zoning landscape. Over the past 8 years, she has helped homeowners and developers unlock the potential of ADUs, combining technical knowledge with a passion for innovative small-space solutions. As a zoning expert, she is dedicated to maximizing property value while contributing to Denver’s housing diversity. She sat on the ADU advisory committee with the City of Denver to analyze and make changes to Denver’s ADU regulations and testified on the state level in support of bringing more ADUs to Colorado.
REAL ESTATE
Sarah Senderhauf
Charles Edington has been an active member of the mortgage and home improvement lending community since 2002. He is a licensed Mortgage Loan Officer with Primary Residential Mortgage and National Account Manager with Loanstar Technologies. After decades of mortgage origination, funding thousands of loans, Charles has specialized his business towards ADU construction, remodels, and home improvement. Charles gained his ADU Specialist designation in 2022 from the ADU Academy and is now proud to be an instructor. Charles is also a member of the Tiny Homes Industry Association and is the Financial Expert for the "How to ADU" Facebook community.
FINANCE & APPRAISAL
Charles Edington
David Schultz
David Schultz has been at the forefront of Denver’s real estate and construction industry since founding his company in 2009. With a portfolio that includes the successful completion of approximately 70 ADUs, David has become a trusted name in innovative housing solutions. Specializing in both traditional stick framing and panelized construction methods, David combines hands-on expertise with a deep understanding of building science. He is passionate about how all the systems work together, ensuring every project is efficient, functional, and built to last. David’s dedication to quality and his ability to adapt to evolving construction techniques make him a leader in Denver’s growing ADU market. His work reflects a commitment to creating thoughtful, well-designed spaces that enhance property value and meet the diverse needs of homeowners.
BUILD
Derek Sherrell
PLENARY
Derek is a real estate investor, ADU builder, and endurance athlete with over 25 years experience in the building/development trade.
His first ADU build was a high school project in 1996. That led to a carpenter apprenticeship and a career as one of the youngest licensed building contractors in Oregon.
Derek founded ThatADUGuy.com and began an open-source video series designed to guide homeowners through the process of building or converting their own ADUs. As a pioneering ADU developer, builder, and investor, Derek brings one of the most comprehensive skill sets to any ADU discussion or instruction. He spends his days running, skiing, talking about ADUs with homeowners, policy makers, builders, and anyone else who will listen.
Derek is a content developer and instructor for ADU Specialist trainings in Southern Oregon.