In Phoenix, Arizona, the architectural firm Benjamin Hall Design has innovatively integrated an accessory dwelling unit (ADU) crafted from concrete blocks into an existing residence. This expansion, known as the Moon Valley Residence, spans 1,756 square feet and is specifically designed to accommodate the needs of a multi-generational family. The new structure consciously diverges in style from the original 1970s suburban home, yet it provides a seamless blend of communal living and individual privacy, offering a unique solution for extended family arrangements.
Completed in 2025, this ADU features a shared entry point with the primary dwelling but maintains its distinct autonomy and secluded atmosphere, partly due to a gracefully curved wall that shields it from the adjacent cul-de-sac. The construction, utilizing grey concrete masonry units for both its exterior and interior finishes, reflects a deep appreciation for the region's architectural heritage. Studio founder Benjamin Hall drew inspiration from childhood journeys through the Southwestern United States, particularly from ancient Native American sites like Montezuma Castle, influencing the ADU's scale, layered forms, and its intelligent design for managing the desert's intense heat and light through varying mass and openings.
The ADU is composed of four distinct volumes, each positioned at different elevations, and features precisely sculpted openings that frame specific views of the surrounding landscape. This volumetric approach creates a dynamic interplay of compression and release within the interior spaces, enhancing the occupant's physical and emotional engagement with the architecture. The design cleverly integrates all necessary utilities within the built-in millwork, avoiding any visible disruptions to the continuous concrete surfaces. This meticulous attention to detail ensures that the daily interaction with elements like light switches and door pulls becomes an intrinsic part of the architectural experience, allowing a retired couple to enjoy private living while remaining intimately connected to their children and grandchildren residing in the main house.
This thoughtful architectural creation not only addresses the practical needs of multi-generational living but also stands as a testament to innovative design that respects its environment and historical context. It demonstrates how modern architectural principles can be applied to foster community and comfort, encouraging a harmonious coexistence within a family unit while embracing sustainable and culturally resonant building practices.