About Derek Sherrell – That ADU Guy
Derek Sherrell is a seasoned ADU developer and contractor based in Southern Oregon, with nearly three decades of hands-on experience in designing, permitting, and building accessory dwelling units. Growing up in the Cascade Mountain range, building was always a natural calling for Derek. A dedicated high school Wood Shop teacher first introduced him to the construction trade, which led to a carpenter apprenticeship and eventually a career as one of the youngest licensed building contractors in the region.
Over the years, Derek has built ADUs for clients, friends, and his own investment projects, developing a deep understanding of every facet of the process — from planning and permitting to financing and construction. His portfolio includes a range of project types such as detached living spaces, cottage clusters, barn cabins, loft conversions, and historic district builds, demonstrating a versatile approach to accessory dwelling unit development.
Derek's mission is rooted in a genuine passion for addressing the housing crisis, particularly the shortage of workforce housing and multi-generational family dwellings. He believes that the ADU strategy has become a necessity in many markets where home prices are cost-prohibitive, and he has dedicated his career to helping everyday people leverage this powerful housing tool to build passive income and greater financial independence.
Custom ADU Plans and Design Services
Derek and his team offer custom, permit-ready ADU house plans tailored to meet local standards and regulations. Their design service is built around accessibility and affordability, making it easier for homeowners to get started without unnecessary financial risk.
- Initial drafts provided within 10 business days
- Best pricing in the market with a focus on affordable design
- Low-risk payment structure — start with a retainer, then pay the balance only after plans are approved
This approach makes professional accessory dwelling unit design accessible to a wider range of homeowners, including first-time buyers exploring the ADU strategy for the first time. Derek also offers free ADU consulting for first-time home buyers, providing expert guidance at no cost to those just entering the market.
ADU Consulting and Open-Source Education
Beyond building and design, Derek is deeply committed to education and community knowledge-sharing. He offers personalized ADU consulting services that guide clients through the complexities of the process — from navigating red tape and zoning regulations to identifying financing options and avoiding costly mistakes. With 28 years of experience, his consultations cover every practical aspect of planning and executing a successful ADU project.
Derek has also developed a comprehensive, open-source video series that walks viewers through every step of the ADU journey — from selecting the right property to designing and financing a space-efficient home. Whether someone is looking to build a rental unit, a backyard cottage, a granny flat, or a guest house, the series is designed to make the process approachable, affordable, and sustainable.
His work is driven by a clear mission: to contribute to the ADU movement, teach people how to create passive income, and share knowledge with anyone ready to take the plunge into accessory dwelling unit development. Derek Sherrell — known widely as That ADU Guy — continues to be a trusted resource for homeowners, investors, and first-time buyers alike.