In simpler times, building restrictions didn’t apply to people living in caves making wheels out of stone. Several thousand years brings us to an era when people make a living riding those wheels as fast as they can, but still need a place to inhabit. Such is the case with two Boulder residents, one of whom is a professional cyclist, and her husband, a cycling coach. And even though they’re not cave-dwellers crammed into a crevice, it started to feel that way when their equipment could no longer be contained within their small home and garage. It was clearly time to evolve.

For this project, design-build firm Arch11 was challenged to accommodate not only the specific needs of such an active family, but also had to comply with strict city guidelines. New rules limited how much square footage the family could build on the corner lot they purchased, and how the space is expressed in terms of environmental impact—among the myriad of other considerations. But for Boulder, basements are basically out of sight out of mind, so that’s where E.J. Meade, Ken Andrews and the Arch11 team maximized the cycle culture of their clients.

Beneath the ground is their massive 2,100-square-foot basement with 10-foot ceilings. Power Bars and miscellaneous gear finally got a proper place within the ample storage additions. A custom mudroom was paired with a basement entrance, which the couple can reach by riding their bikes down a flight of low-tread stairs, designed for such use. The family’s children aren’t yet of riding age, but any parent will tell you that having a basement playroom for toys and messes that can stay put even when a dinner party is scheduled is enough reason to raise a glass. Space for an exercise room was also allotted in the plans. A breezeway to the garage was another bonus—not to mention that they can actually parking their cars in it now that outdoor gear is buttoned up.

Moving upstairs, the tri-tiered floating staircase is a central feature, not an afterthought. “There’s a strong connection between the basement and the second floor,” said Ken Andrews, who was in charge of seeing this project through to the end. A large window placed in the stairwell makes for a vibrant transition—one usually lost between subterranean spaces and the ground floor. Once arriving in the dining/kitchen space, smooth polished concrete floors bring a cozy yet primitive feel and can hold up to high-traffic. Sweeping street views and the ability to open a full wall to the back patio was an intentional move to bring the outdoors inside. “There’s daylight in every room,” said E.J. Meade, principal at Arch11. The largest volume of glass encompasses the sunken living room. It looks out on a simple lawn spotted with boulders that double as climbing spots for the family’s young kids.

Rocks play an integral role in the conception and orientation of the home. It’s called the Dihedral House—an interesting albeit unfamiliar idea to those unschooled in geology. “In geological terms, it’s an angular sheer that happens in a rock formation,” Meade said. Similarly, in geometry, a dihedral is the angle between two mathematical planes. “Those two lines are rigorously carried throughout the entire composition of the house,” said Andrews. “It’s not exactly a generator for the house’s organization, but more of a synthetic device.”

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The concept is most overt upon arriving at the top floor where these guidelines situate the home for a view of the most important rocks of all—Boulder’s beloved Flatirons. Each family member has a room on this level connected by hallways that slightly shrink in order to maintain the desirable perspectives of the home. As with downstairs, natural light is a driving force behind the design. “The shower acts like a lantern,” said Meade regarding the full pane window of frosted glass in the master shower that spills light into the entire bathroom. Sensitivity to their clients allowed ample opportunities for Arch 11 to rise to the occasion, as they folded intimate details into a stunning product.

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“We try to limit our palette in every project,” Meade said—and the informed material choices allow the Dihedral House to shine. The corner home is exemplary of eco-friendly Boulder values paired with world-class execution, thanks in part to the dynamic partnership of board-formed poured concrete and cedar panels that tie the space together. “Historically, it holds up really well,” Meade said of a house that has brought this family out of the Stone Age and into a modern era.

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Story by Eleanor Perry-Smith