Reston, Virginia, clients with a home on Lake Newport hired design/build firm Denny + Gardner to construct a 24-by-20-foot sunroom addition that would make the most of the waterfront locale. “They were interested in a multi-functional, indoor/outdoor living space that would be comfortable year-round,” explains partner Jason Denny, who managed the project.

He and his team began by reframing a two-story rear wall to accommodate a combination of French and bi-fold doors leading out from the second-level great room to the new sunroom. A vaulted ceiling in the great room allowed for rows of oversized transom windows between the spaces, aligning with three large skylights on the sunroom side. Sunspace WeatherMaster windows open wide for indoor-outdoor connectivity in the warmer months. Stone columns support the addition, which shelters a patio beneath it. A French door off the sunroom leads to a TimberTech composite deck with cable rails.

A stone fireplace wall anchors the sunroom; the two-sided gas fireplace is glassed in, framing the vista. With the help of two Infratech heaters, it keeps the space cozy all year round. A tongue-and-groove ceiling painted crisp white and a large-format, slate-look porcelain-tile floor convey clean-lined, transitional style.

Renovation Architecture: Benjamin J. Carstoiu, 358 Design Studio, Herndon, Virginia. Renovation Design & Contracting: Jason Denny, Denny + Gardner, Sterling, Virginia.