For this ADU conversion project in Washington, DC, the clients envisioned a flexible space that could function as a home office, a quiet retreat separate from the main house, and a comfortable guest cottage for visiting family, particularly in-laws. The office of Anthony Wilder Design/Build took on the task of achieving these goals – and more.
The existing backyard structure measured approximately 258 square feet on the main level and 124 square feet at the loft. At the time of the renovation, the space was being used for storage; prior to that, it had functioned as an arts and crafts workshop. Historically, the building originated as a carriage house, and later received a porch addition, which was eventually enclosed to create additional interior space.
Overall, the structural and foundation integrity were in good condition. The building had electrical service and a gas line serving a fireplace, but no water, sewer or HVAC connections.
The primary challenge was accommodating multiple programmatic needs – workspace, living area, guest accommodations and full bathroom – within the very limited footprint. The designers addressed this through a highly efficient layout, strategic space planning and careful coordination of utility locations to maximize functionality without compromising comfort.
The clients no longer desired a fireplace, and its removal allowed the architects to significantly improve the efficiency and flexibility of the limited floor area. Eliminating it opened up the plan and made room for more functional living space.
Local Requirements for an ADU
In Washington, DC, a fully enclosed bedroom is not strictly required for an ADU of this type. Given the compact footprint and the clients’ preference for flexibility, the Anthony Wilder team incorporated multi-functional furniture, such as a sofa bed, to accommodate sleeping needs.
The utility connections from the main house dictated the placement of the wet bar and full bathroom, allowing for an efficient and cost-effective infrastructure layout.
A bowed ridge beam in the roof structure presented a challenge. Because the design called for an expanded dormer and larger window openings, the architects took the opportunity to replace the ridge beam to properly support the existing rafters while improving the overall geometry of the ADU.
Sources
Design: Stephanie Terrazas; Shannon Kadwell, CMKBD, Allied ASID; Mike Marion; Anthony Wilder Design/Build Photography: John Cole Photography Cabinetry: American Cedar & Millwork (kitchen), Rejuvenation (bath) Cabinet Hardware: Plank Countertop: Petra Stone Faucets: Signature Hardware Lighting: Shades of Light (bath sconces) Sinks: Elkay Tile: Vallefuoco Toilet: TOTO
