PTR House

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Photo Credit © Anice Hoachlander

Robert M. Gurney, FAIA, Architect
Potomac, MD

Photographs ©  Anice Hoachlander

Project Partners: Timberworks Construction and CHLA Campion/Hruby

Photo Credit © Anice Hoachlander

Located in Potomac, Maryland, a suburb of Washington, DC, this residence stands apart from the developer driven, over-sized traditional and pseudo-traditional houses found in many of the adjacent neighborhoods. Differing from the conventional aesthetic, the owners of this project had a vision for design that embraced optimism and creativity in the face of a daily reality that conspires against deviation and rewards risk avoidance. This new house is site responsive and coupled with a strategically positioned gallery space, shields itself from street views and neighboring lots, crafting a secluded, tranquil rear sanctuary on the irregularly shaped lot. Geometric landforms provide additional screening, reduce road noise, and utilize materials excavated during construction instead of hauling them offsite. A defined path extends the simple geometry and focused circulation initiated in the gallery building, allowing one to meander around rain gardens and through a bamboo grove that provides additional screening and privacy.

The polygonal shaped house is designed as a hierarchy of spatial volumes where circulation is seamless and free flowing. Folded planes define an irregular geometry that remains mostly solid along the road. In addition to providing visual privacy, the folded roof plane provides a thickened wall system allowing for increased thermal and sound insulation. The solid planes gradually unfold to reveal expanses of glass with lofty ceilings opening to views of the rear yard and gardens. Inspired by tree branches, the window fenestration is designed as an irregular datum that unwraps to reveal a contiguous pattern responsive to the site conditions.

The interiors are dynamic, and light filled, combined with a controlled tension as spaces are modulated with differing ceiling heights.  A projecting volume slices through the main living space, providing an elevated, intimate retreat within the expansive high-ceilinged volume. Finishes are reserved, allowing the views toward the landscape, natural light, and shadows to provide primary sensory experiences. A gallery / event space is designed to foster community engagement and a connection with local and regional art events and group showings.

Photo Credit © Anice Hoachlander
Photo Credit © Anice Hoachlander
Photo Credit © Anice Hoachlander

Rain gardens provide on-site water management while enhancing the landscape. A green roof is employed on the flat-roofed gallery structure. The project incorporates a geothermal mechanical system with aeroseal duct sealing and radiant floor heat to supplement the passive quality of the concrete slab flooring with full R-10 Insulation. Walls employ R 28 spray foam insulation and R 49 spray foam insulation is used in the roof. A double envelope on the western walls provides an additional layer of insulation and an overhang. A limited amount of glass on the western exposure further reduces solar gain. The contiguous folded window fenestration is modulated in respect to the solar orientation and landscape components.

Published: 04/21/2026
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