Northwest Valley
ADU & Casita Builder in Peoria, AZ
Blackstone Contracting is based in Peoria, at 8742 W Deer Valley Rd. Since Peoria adopted its accessory dwelling unit rules at the end of 2024, a casita on a single-family lot is a permitted use here, and the questions that remain are what fits on the lot and how it connects to the house.
The scope
Feasibility, permit and build on one Peoria lot.
An ADU or casita is a small house: foundation, framing, roof, plumbing, electrical, HVAC, kitchen or kitchenette, bathroom and finishes, plus the utility connections back to the main home. In Peoria the zoning question is now mostly settled by the city code, so a turn-key ADU project starts with the lot itself — how much coverage is left, where the 5-foot setbacks put the building, where the sewer and water lines run, and what an HOA will ask for. From the older neighbourhoods in 85345 to the master-planned communities across 85381, 85382 and 85383, those answers change from one lot to the next.
Discuss a Peoria ADU or casitaFor the trade-by-trade detail, see turn-key adus & casitas, home additions & second stories and design services & permitting.
What changes in Peoria
- Peoria allows accessory dwelling units by right under City Code §21-316, adopted by Ordinance 2024-20 in December 2024 to meet Arizona’s ADU law (A.R.S. §9-461.18): one attached and one detached ADU on a lot where a single-family home is allowed, with no public hearing.
- An ADU can be no larger than 1,000 square feet or 75% of the main home’s gross floor area, whichever is less, so measuring the existing house is the first step of any design.
- Side and rear setbacks for an ADU are 5 feet, and the ADU counts toward the zoning district’s maximum lot coverage, which is often what limits size on smaller lots.
- No additional parking is required for an ADU, and the city cannot require it to match the exterior design of the main house. It cannot be sold separately from the home.
- HOAs across north Peoria still apply their own architectural review to a detached casita. That approval runs alongside the city permit and is worth starting early.
- Development impact fees apply to new dwelling units in Peoria and vary by service area, so they belong in the budget from the start.
Work may include
- Lot and utility feasibility review: coverage, setbacks, easements, sewer and water routing
- Design and engineering coordination for detached casitas and attached ADUs
- Garage and room conversions into an attached ADU
- City of Peoria permit submittal and HOA submittal coordination
- Foundation, framing, roofing, MEP and HVAC through final inspection
- Kitchen or kitchenette, bathroom and interior finishes
Bring these details
- Your address or ZIP, and the approximate square footage of the main house
- Detached casita, attached ADU or a garage conversion
- Who it is for — family, guests or long-term rental
- Where on the lot you picture it, and any pool, trees or easements
- HOA name, if there is one
- Finish level and a target budget
How these projects usually run
General points that apply to most projects of this kind. Confirm the specifics for your property when you request an estimate.
- Can I build a casita in Peoria?
- On most single-family lots, yes. Peoria City Code §21-316 permits one attached and one detached accessory dwelling unit wherever a single-family home is allowed, without a public hearing. A building permit is still required, and HOA rules still apply where there is an HOA.
- How big can an ADU be in Peoria?
- The lesser of 1,000 square feet or 75% of the main home’s gross floor area. A 1,200-square-foot house, for example, caps the ADU at 900 square feet. Lot coverage and 5-foot setbacks can limit it further on smaller lots.
- Can a Peoria ADU be rented out?
- Arizona law bars Peoria from prohibiting long-term rental of an ADU or requiring the occupant to be related to the owner. Short-term rentals follow the city’s separate vacation rental permit rules. Confirm the current requirements for your situation.
- Detached casita or garage conversion?
- A garage conversion reuses an existing slab, roof and walls, so it is usually the faster path, at the cost of the garage. A detached casita gives more privacy and design freedom but brings a new foundation, longer utility runs and more of the lot under coverage. The feasibility review compares both for your lot.
Permits and licensing
- Permits issued by City of Peoria.
- Blackstone Contracting holds Arizona ROC #344694, valid statewide.
- Based at 8742 W Deer Valley Rd, Peoria, AZ.
Building an ADU in 85381, 85382, 85383 and 85345
Peoria’s housing changes a lot from south to north. In 85345, around Old Town and the established neighbourhoods off Grand Avenue, lots are often older and larger, with mature trees and utility lines that predate today’s standards; tying a casita into an older sewer lateral needs checking before design is final. Moving north through 85381 and 85382, most homes are from the 1980s through the 2000s on standard subdivision lots, where coverage and setbacks usually set the size. In 85383, the newer master-planned communities toward Lake Pleasant bring HOA review and, on many lots, desert grades that affect where a detached structure can sit.
Blackstone’s office is in 85383, on Deer Valley Road. Wherever the lot is, the project follows the same sequence: feasibility, design and engineering, HOA and city submittals, construction and final inspection.
What a turn-key ADU builder coordinates
Turn-key means one contractor carries the project from the first site visit to the final inspection: the designer and engineer, the permit and HOA submittals, the utility connections and every trade on site. For an owner that removes the gaps between consultants, which is where most ADU budgets and schedules slip.
For the Phoenix-wide service and the planning detail, see turn-key ADUs and casitas; for attached space that is not a separate dwelling, see home additions.