August 11, 2026

A Costly Dream: Building an ADU in Los Angeles

Joshua Leibner and Katherine Henninger pride themselves on living within their means. Henninger, an English professor at Louisiana State University, shares that Leibner is frugal, driving across town for discounts. Yet, their decision to build an accessory dwelling unit (ADU) beside their Northeast Los Angeles home came with unexpected costs. Initially estimated at $300,000, the final expense doubled to nearly $600,000.

The couple’s 400-square-foot studio features vaulted ceilings and clerestory windows, creating an open, airy atmosphere. Leibner and Henninger invested in their ADU seven years after purchasing their Midcentury Modern home for $615,000. The unique semicircular floor plan of the 1950 home had lingered on the market for ten months before they bought it.

They envisioned the ADU as a flexible space, serving as an artistic yet comfortable dwelling for family or tenants. Situated on a scenic ridgeline between Eagle Rock and Highland Park, the only feasible location for their ADU was their garage’s site.

Architects Brennan Buck and David Freeland from FreelandBuck were engaged after the couple admired their work at the Smithsonian’s Renwick Gallery. Their design for the ADU featured a vertical structure above the garage, with high ceilings and strategically placed windows offering cross-ventilation. The central space also included terraced decks for outdoor activities.

The ADU housed multiple niches, including a kitchenette, sleeping loft, and living room. Its compact space proved versatile, accommodating a small office, dining area, or living room. The couple’s art collection enhanced this unique space, making it their own.

The pandemic increased costs beyond their expectations, leading them to subcontract various tasks and participate in the renovation themselves. They skillfully managed resources, even posting parts of their demolished garage online for free.

The project reflected community engagement, commented architect Buck. Despite financial concerns, the ADU now offers rental income as the couple temporarily relocates to care for family in Virginia. Henninger emphasizes the emotional ties to their Los Angeles home.

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