Header: HK ASSOCIATES
Casa Ala Blanca, designed by HK ASSOCIATES, reimagines small-footprint desert living through a single architectural gesture that unites passive environmental performance, rainwater harvesting and everyday experience.
Traditional sustainable practices
Casa Ala Blanca is a net-zero, site-responsive and small-footprint residence situated in the exurban fabric of Oro Valley, Arizona, USA. Meaning “white wing house”, the home layers Sonoran architectural traditions of shade protection, water collection and indoor-outdoor entanglement into a unified form that integrates daily life with practical amenities.
Design inspired by views
Defined by the path of the sun and the purposeful consideration of views, the home layers spatial interconnections and sequences that are at once intimate and protected yet bold and outward-facing. A view of the Tortolita Mountains led to the open plan of the main living space, which combines kitchen, dining and living activities, while the western side of the home (containing lightly occupied bedrooms and a home office) is hinged to protect this expansive north orientation from the harsh western sun. Carefully composed openings to the iconic western sunset are framed with protective shrouds and movable screens to reconcile spectacle and energy performance.
Different from others
The home’s tuned, figural form is likewise a response to the adjacent urban context, defined by the clustered arrangements of function over time: modest single-storey homes, paired with detached garages and utilitarian outbuildings. The wing-like form of Casa Ala Blanca collects these disparate functions to benefit the whole: the south-facing unconditioned garage, which acts as an insulating solar buffer for the main living space, while the attached workshop offers an autonomous refuge for client pursuits which can accommodate change in the form of a future accessory dwelling.
Clad in corrugated metal panels in solidarity with neighbouring practical sheds, Casa Ala Blanca’s wing-like roof directs rainwater to an entry rain garden, which nourishes the north-facing shade garden, east-facing vegetable garden and interior secret garden.
The winged roof
As empty nesters, the compact but efficient floor plan serves their tailored programmatic needs in a modest 220 m², while also offering environmental connection and surprise. The clients were specific that the design of the home not be an agglomeration of stuccoed parapet boxes, stipulating the necessity of a sloped roof, while adding the contradictory request for an occupiable roof terrace.
The wing-like shape of Casa Ala Blanca emerged as an integrated solution to the multi-valent design challenge. In a single gesture, the inverted butterfly roof of the home creates sombrero-like shade that expands and protects the perceived limits of the modest floor plan, adds 343 m² of rainwater surface capture, and fosters ample opportunity for solar PV integration.
Two figure-ground subtractions from the roof silhouette deepen the design’s engagement: the first, an irregular polygon that traces the primary bedroom below, becomes the requested roof terrace, artfully concealed within the overall form; the second, a circular oculus that brings daylight and biophilic connection to the heart of the home, creates a secret garden.
Independence in the desert
Off-grid in terms of sanitary septic and on-site well water, the home’s only utility connection is to the electrical grid. The clients’ ambition was to deepen this independence, thereby benefiting the larger community and ecosystem. The design is net-zero energy, achieved through a layered approach of energy conservation supplemented by on-site generation. Rainwater harvesting minimises impacts on (and even benefits) the local aquifer through the assemblage of rain-fed gardens that mediate the home’s interface with the natural world.
Project information
Architecture Company: HK ASSOCIATES
Design Team: Kathy Hancox, AIA, Michael Kothke, AIA
Photography: HK ASSOCIATES
Location: Tucson (Oro Valley), Arizona, USA
Date: 2025
Area: 220 m²
Source: v2com newswire
