Everything homeowners ask about building an ADU in Peoria — answered with 2026 data.
Yes, ADUs are allowed in Any lot or parcel where the zoning allows a single-family dwelling — including the R1-43, R1-35, R1-18, R1-12, R1-10, R1-8, R1-7 and R1-6 single-family districts (Peoria City Code §21-316.D.1.a and §21-422.B). Not permitted on a lot or parcel with a duplex or other multiple-family development (§21-316.D.1.b) in Peoria, AZ. The maximum size for a detached ADU is The lesser of 75% of the gross floor area of the existing single-family dwelling or 1,000 sq ft (Peoria City Code §21-316.C.2); 'gross floor area' means interior habitable area (§21-316.B). Attached ADUs can be up to Same cap — the lesser of 75% of the primary dwelling's gross floor area or 1,000 sq ft. Peoria has an ADU-friendliness score of 7/10. Check our full Peoria ADU rules page for complete zoning details.
ADU construction in Peoria typically costs $120,000-$245,000. The cost per square foot averages $145-$270. Garage conversions are more affordable at $55,000-$135,000, while prefab ADUs cost $85,000-$200,000. Permit fees add Building permit and plan review fees apply — Confirm current amounts with Peoria Development Services to your budget. See our detailed Peoria ADU cost guide.
Detached ADUs in Peoria can be up to The lesser of 75% of the gross floor area of the existing single-family dwelling or 1,000 sq ft. Attached ADUs are limited to Same cap — the lesser of 75% of the primary dwelling's gross floor area or 1,000 sq ft. Junior ADUs (JADUs) have a cap of Not a category in Arizona — Peoria's ordinance has no junior ADU designation. Maximum height is Same height limit that applies to a single-family dwelling in the district — 30 feet in every R1 district (Peoria City Code §21-316.D.4; district table at §21-420.A). You are allowed up to 2 per lot — one attached plus one detached ADU. On a single-family lot of 1 acre or more: one attached plus two detached, but only if at least one of the detached units is a 'restricted-affordable dwelling unit' deed-restricted to households earning up to 80% of area median income on a qualifying lot.
Rear setback: 5 feet from the property line (Peoria City Code §21-316.D.2.a) — a relaxation from the 15-foot rear setback the main house must observe in R1-6 through R1-18. State law caps what the city may require here at 5 feet (A.R.S. §9-461.18(B)(6)). Side setback: 5 feet from the property line (Peoria City Code §21-316.D.2.a); state law caps the city's side setback requirement at 5 feet (A.R.S. §9-461.18(B)(6)). Front setback: The principal front building setback of the underlying zoning district (Peoria City Code §21-316.D.2.b) — per §21-420.A that is 20 ft in R1-6 through R1-12 with a front-facing garage (10 ft for a side-entry garage), 20 ft in R1-18, 30 ft in R1-35 and 35 ft in R1-43. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.
None — no additional parking space or in-lieu parking fee may be required for a new ADU (Peoria City Code §21-316.D.6; A.R.S. §9-461.18(B)(3)). Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.
Not required. Under state law Peoria may not prohibit leasing or advertising either the house or the ADU as separate long-term rental housing, and may not require any familial, marital, employment or other pre-existing relationship between the occupants (A.R.S. §9-461.18(B)(1)-(2)). Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.
The ADU permit review timeline in Peoria is typically Confirm with Peoria Planning & Community Development — no published ADU review timeline found in a city source. Plan check: Full construction plan review under Peoria's building and fire codes and the Peoria Engineering Standards Manual (§21-316.A). State law bars the city from applying a commercial building code to an ADU or requiring a fire sprinkler (A.R.S. §9-461.18(D)). Pre-approved plans availability: No city pre-approved ADU plan library found — Confirm with Peoria Development Services.
Average ADU rental income in Peoria: 1-bedroom units rent for $1,300-$1,600/month, 2-bedroom units for $1,600-$2,000/month. Short-term rentals: Confirm with the City of Peoria — §21-316 does not address short-term rental of an ADU, and Arizona limits how far cities may restrict vacation rentals. What state law does guarantee is the long-term side: Peoria cannot prohibit leasing the house or the ADU separately on a 90-day-or-longer or month-to-month basis (A.R.S. §9-461.18(B)(1), (I)(3)). Expected ROI: 6-9% annual return.
The minimum lot size for an ADU in Peoria is No ADU-specific minimum lot size — an ADU is allowed wherever the zoning allows a single-family dwelling. The district's maximum lot coverage (30% in R1-43 up to 45% in R1-10 through R1-6, §21-420.A) is the practical constraint, and a lot of 1 acre or more unlocks a third unit. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.
Garage conversions are one of the most popular and affordable ADU options. In Peoria, a garage conversion typically costs $55,000-$135,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.
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