What it means
Adobe is mud brick: earth, water and straw pressed into a mold and dried in the sun, then laid up into walls a foot or more thick and plastered against the rain. The word also means a building made that way, and in Scottsdale it has a third meaning, the one you will hear most: a look. Soft corners, flat roof, earth-colored walls, a few round beam ends poking through. “Adobe-style” on a listing almost always means block or wood frame dressed in stucco.
The real thing is rare here and worth the detour. The best example is the Old Adobe Mission on Brown Avenue, the town’s original Catholic church, completed in 1933. Its builders were the town’s Mexican-American families, cotton-field and ranch workers who made the bricks by hand on the site from clay, sand, straw and water. The other famous one is the Hermosa Inn, the adobe home and studio that cowboy artist Lon Megargee began building in Paradise Valley in the mid-1930s.
Where you’ll meet it
On real estate listings, in resort brochures, on the walls of the Old Adobe Mission, in every argument about what Pueblo Revival should look like, and on the slump-block walls of South Scottsdale.
Where the word came from
Few English words are older. Adobe came into English from Spanish, which took it from Arabic at-tub, “the brick,” which came from Coptic, which came from the Egyptian db.t, mud brick. The word has crossed four languages over roughly 4,000 years with little change in sound or meaning. Merriam-Webster dates its first known use in English to 1748, and in the Southwest it arrived with Spanish colonists, who brought brick molds to building traditions that were already using earth.
The material is local almost everywhere in the desert, which is the point: the ground is the quarry. Scottsdale’s mission builders dug theirs nearby. Its weakness is water. Unprotected adobe melts back into mud, which is why it lives under plaster, wide eaves and constant repair.
Burnt adobe fixed that by firing the brick in a kiln. It is harder, takes weather better and is larger and thicker than ordinary red brick. In Tucson it was the standard material for postwar houses: most of the city’s burnt-adobe homes were built between 1950 and 1970, from bricks made across the border in towns such as Sasabe, Querobabi and San Luis. Shipping costs kept it from spreading much north of Tucson.
The Phoenix area took a different route to the same look: concrete block. Superlite’s earth-toned slump block, squeezed before curing so each face bulges, needed no paint and, as the industry still says, mimics old adobe.
What it is not
Adobe is not stucco. Stucco is a finish, and it can cover anything. It is also not caliche, the hard mineral layer in Valley soil, though both come out of the ground. And an “adobe” on a listing is not a promise of earthen walls; ask what is under the plaster.
The fine print
The civic version. When Bennie Gonzales designed City Hall and the library for the 1968 Civic Center, he wanted real adobe. Building rules pushed him to masonry and concrete, and the compromise produced the gleaming white, thick-looking walls that became civic Scottsdale’s signature. The city’s best-known adobe silhouette is, structurally, not adobe at all.
The mission’s record. The Old Adobe Mission, designed by the Scottsdale builder Robert T. Evans, was abandoned as a parish church in 1956, restored beginning in the early 2000s and listed on the National Register of Historic Places in 2018. Accounts of how many bricks went into it differ, from about 6,000 to roughly 14,000, so treat any single figure with caution.
The postwar styles. The city’s historic preservation office, cataloging postwar townhouses, describes a “Los Ranchos” style of stucco or slump-block walls with applied Spanish ornament, and a “Popular Pueblo” style with rounded parapets and vigas. Both are adobe as costume: the shape of mud brick, built from block. For the heavy concrete reality behind most of those walls, see block wall.
The thermal question. Earthen mass smooths daily temperature swings, which works best where nights cool off. A Phoenix July, with overnight lows that often stay in the upper 80s, tests that theory hard.