Masonry ADU Blends Privacy and Connectivity in Phoenix

Benjamin Hall's Moon Valley Residence rethinks the accessory dwelling unit as a distinct yet integrated ecosystem.

Apr. 10, 2026 at 9:38am

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A vibrant, high-contrast silkscreen print depicting a repeating grid of a single, iconic concrete masonry unit in shades of neon pink, orange, and blue, capturing the material honesty and visual impact of the Moon Valley Residence ADU's design.The bold, masonry-forward design of the Moon Valley Residence ADU asserts its architectural presence while seamlessly integrating with the main home.Phoenix Today

A bold, masonry-forward ADU in Phoenix's Moon Valley neighborhood flips the script on suburban living, reimagining privacy, connectivity, and heat management through a concrete-brick lens. Designed by architect Benjamin Hall, the project signals a shift in how the main home and its auxiliary sibling become distinct but intimately related ecosystems, moving the conversation about multigenerational living from a logistical concern to a design philosophy.

Why it matters

The Moon Valley ADU presents a practical blueprint for aging in place without severing ties to family networks, redefining the social contours of the suburb. It also embraces concrete masonry units as a deliberate design language, signaling a broader trend in Phoenix's evolving architectural dialogue around resilience, material honesty, and a nuanced reading of climate as a design partner.

The details

The ADU uses grey concrete masonry units for both exterior and interior surfaces, creating a continuous material language that visually aligns with its desert context while offering a robust, low-maintenance envelope. The four-volume plan nests the living, sleeping, and service spaces at different elevations, yielding a sense of compression and release that plays with human scale. Utilities are hidden within the masonry thickness, elevating the haptic experience of architecture and reframing how residents live with technology in the home.

  • The Moon Valley ADU was completed in 2026.

The players

Benjamin Hall

The architect who designed the Moon Valley Residence ADU project in Phoenix.

Montezuma Castle

A historic site that inspired the design narrative of the Moon Valley Residence ADU.

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What they’re saying

“The project signals a broader shift: when the main home and its auxiliary sibling become distinct but intimately related ecosystems, the conversation about multigenerational living moves from a logistical concern to a design philosophy.”

— The author

“The real narrative here is about self-sufficiency without isolation. The four-volume plan nests the living, sleeping, and service spaces at different elevations, yielding a sense of compression and release that plays with human scale.”

— The author

What’s next

The Moon Valley Residence ADU project serves as a model for how accessory dwelling units can redefine multigenerational living and suburban neighborhood dynamics in growing cities like Phoenix.

The takeaway

The Moon Valley Residence ADU project demonstrates how masonry-forward design can create a distinct yet integrated ecosystem, blending privacy and connectivity to reframe the conversation around aging in place and multigenerational living in the suburbs.