Residential drafting in Prescott, Arizona
Prescott is not a Phoenix suburb and should not be drawn like one. The historic core holds Territorial, Victorian, Queen Anne, Craftsman, bungalow, and early vernacular houses. Later areas add postwar ranch homes, mountain cabins, masonry and wood frame houses, and recent subdivisions. The city carries a large number of local and National Register historic districts, so exterior work often has a review step that a valley project would not.
The construction detail is different too. Older foundations may be stone, unreinforced masonry, crawlspace, or early concrete, and none of those were designed for a modern addition load. Wood siding, masonry chimneys, steep roofs, enclosed porches, and multiple generations of additions all need measured documentation rather than assumption.
Then there is climate. Snow, freeze protection, roof drainage, and water service burial have to be detailed for this elevation, not carried over from a desert set. In forested neighborhoods, wildland urban interface construction affects siding, roof, vents, and decks, and defensible space affects where the building can go.
Grade and trees are site constraints, not landscaping notes. Mature ponderosa and oak can control access, grading, roof clearance, and utility routing. Broad shallow flooding and sheet flow are documented in parts of the city, so drainage is not only a creek question.
ADU standards
Setback, size, and parking rules for an accessory dwelling unit in Prescott.
| Maximum size | 600 sq ft or 50 percent of the house, whichever is greater, counting every accessory structure on the lot together (2.5.6.B, 2.5.2.B) |
|---|---|
| Side setback | 7 ft in SF-6 and SF-9, rising to 35 ft in RE-2 (2.7.3.D.5) |
| Rear setback | 20 ft in SF-6, rising to 35 ft in RE-2 (2.7.3.D.5) |
| Height | 20 ft, with a possible 10 percent administrative adjustment (2.7.3.E.4.e, 2.7.3.E.5) |
| Rented separately | Not permitted (2.5.6.C, 2.5.6.F) |
| Water | A private water submeter is required (Ordinance 2025-1881) |
Prescott is below the population threshold in Arizona's ADU statute, so the state ADU mandate (A.R.S. 9-461.18) does not apply here. Other state ADU law can still reach the city. Local code governs.
Two Prescott rules reshape the project. First, the unit may not be rented separately from the main house (2.5.6.C, 2.5.6.F). If rental income is the reason for building, that is the answer before anything else gets drawn.
Second, the size limit is not the unit's own. It is 600 square feet or half the house, whichever is greater, counted across every accessory structure on the lot together (2.5.6.B, 2.5.2.B). An existing garage, shop, or shed already uses part of that allowance. We measure what is there before proposing a size.
The city also amended its code in February 2025 to require a private water submeter for the unit. That belongs on the utility plan from the start, not as a permit afterthought.
Planning office: Prescott Permits Center and Planning and Zoning
Sources: Prescott Land Development Code 2.5.6, 2.5.2, 2.7.3. Ordinance 2025-1881, adopted February 2025. A.R.S. 9-461.18. Last checked August 2026.
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