Yes: Avondale allows accessory dwelling units by right under Zoning Ordinance §28-33(a), adopted by Ordinance No. 2032-1124 on November 18, 2024 and unchanged in the code as codified through July 6, 2026. Every single-family district plus R-2, R-3 and MH allows one attached and one detached ADU per lot, each capped at the lesser of 75% of the house's interior habitable area or 1,000 sq ft, with 5-foot rear and side setbacks, the house's own 30-foot height limit and no extra parking. Avondale then adds conditions most Valley cities do not: a two-bedroom maximum, a separate house number, one shared driveway, connection to the house's utilities, and no short-term rental of a new ADU unless the owner lives on the property. Expect a building permit of roughly $2,400-$3,300 on the FY2027 fee schedule plus $14,373 in water and sewer impact fees, because the ordinance counts an ADU as a new dwelling unit for those fees; the city reviews building applications in 16 business days.
In Avondale you will also hear an ADU called a casita — Arizona's ADU statute (A.R.S. §9-461.18) and most local codes use it. The rules on this page apply either way.
Zoning & Size Requirements [1][2][3]
Yes — Avondale allows ADUs. A detached ADU can typically be up to 1,000 sq ft under current Arizona and Avondale zoning rules.
See what this means for your lot — ask Avondale ADU builders for a quote →
| Allowed Zones | Permitted with conditions (PC) in AG, RR-43, RR-18, R1-35, R1-15, R1-10, R1-8, R1-7, R1-6 and R1-5, and in R-2, R-3 and MH; prohibited in R-4 (§28-32 matrices). Only where the district allows a single-family home, never on a lot with a duplex, townhome or multi-family development (§28-33(a)(3)(B)). Excluded: tribal land and land in the vicinity of a military, FAA-licensed, general aviation or public airport (§28-33(a)(12)) — Luke AFB and Phoenix Goodyear Airport are nearby; get a parcel check |
| Max Size (Detached) | The lesser of 75% of the gross floor area of the existing single-family dwelling or 1,000 sq ft (§28-33(a)(3)(A)); for this section gross floor area means the interior habitable area of the house or the ADU (§28-33(a)(3)(A)(I)), not the exterior-wall measure in §28-15. No more than two bedrooms (§28-33(a)(3)(G)). A detached ADU counts toward the district building coverage cap: 45% in R1-8 to R1-5, 40% R1-10, 20% R1-15, 30% RR-18, 15% AG/RR-43/R1-35 (§28-33(a)(3)(E); §28-35.A; §28-133(f)) |
| Max Size (Attached) | Same cap — the lesser of 75% of the house's interior habitable area or 1,000 sq ft, and no more than two bedrooms (§28-33(a)(3)(A), (G)). It needs its own entrance, from outside or from a common hallway, and an egress path to the street that does not pass through the main house (§28-33(a)(3)(H)) |
| Max Size (JADU) | Not a category in Arizona — Avondale's Zoning Ordinance has no junior ADU designation (§28-15 definitions and §28-32 matrices list only 'Accessory dwelling unit (ADU)', read 9/20/2026). New guest houses are no longer a permitted use; an existing permitted guest house begun before November 18, 2024 counts as one of your ADUs (§28-33(a)(1)(D)) |
| Max Height | The same height limit as a single-family dwelling on the lot (§28-33(a)(3)(F)): 30 ft in every single-family district from AG through R1-5 and in R-2 and R-3 (§28-35.A-B tables). The 15-ft cap on ordinary accessory buildings expressly does not apply to an ADU (§28-133(e)); state law bars a stricter ADU height than the house's (A.R.S. §9-461.18(B)(5)) |
| Max Units | 2 per lot — one attached plus one detached ADU (§28-33(a)(1)(A)-(B)). On a lot of 1 acre or more: one attached plus two detached, but only if one is a restricted-affordable unit under a recorded 30-year deed restriction or development agreement, rented at Arizona Department of Housing limits to a household at or below 80% of area median income, with an annual report each January (§28-33(a)(1)(C), (8); A.R.S. §9-461.18(I)(6)). No mobile home or RV may serve as an ADU (§28-33(a)(4)) |
Setback Requirements [1][2][3]
Avondale requires a rear setback of about 5 ft for a detached ADU, and no additional parking is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 5 ft from the property line (§28-33(a)(3)(D)(I)), against a house rear setback of 15-40 ft by district; state law caps what the city may require at 5 ft (A.R.S. §9-461.18(B)(6)) |
| Side Setback | 5 ft from the property line (§28-33(a)(3)(D)(II)) — the state-law ceiling. The ordinance does not expressly relax the street-side setback on a corner lot (10 ft in R1-10 through R1-5, 20-25 ft in RR-18/R1-15/RR-43/R1-35, 40 ft AG under §28-35.A), so ask Planning before siting a casita on the street side |
| Front Setback | The front yard setback of the zoning district under §28-35 (§28-33(a)(3)(D)(III)): 20 ft in R1-7, R1-6 and R1-5; 25 ft in R1-10, R1-8 and RR-18; 35 ft in R1-15; 40 ft in R1-35, RR-43 and AG; 20 ft R-2, 25 ft R-3 (§28-35.A-B; 5 ft less with a side-entry garage). A detached accessory building is never allowed in a front yard (§28-133(a)) |
| Parking Required | None — no additional parking space or in-lieu parking fee may be required for a new ADU (§28-33(a)(5); A.R.S. §9-461.18(B)(3)). But the lot may have only one driveway, shared by the house and the ADU, and a new ADU must use the existing driveway (§28-33(a)(3)(L)) |
| Owner Occupancy | Not required to build or to rent long-term — the ordinance says outright that either the house or any ADU may be separately leased as long-term rental housing (§28-33(a)(2)(C); A.R.S. §9-461.18(B)(1)-(2)). An ADU may not be sold separately from the house (§28-33(a)(2)(B)). Owner residence IS required to use an ADU finaled on or after September 14, 2024 as a short-term rental (§28-33(a)(7)) — see the rental section |
| Min Lot Size | No ADU-specific minimum lot size — the one-attached-plus-one-detached allowance applies on lots under and over 1 acre alike (§28-33(a)(1)(A)-(B)); a lot of 1 acre or more can add a second detached unit if one is restricted-affordable (§28-33(a)(1)(C)). District minimums for the house itself run from 5,000 sq ft (R1-5) to 43,000 sq ft (RR-43) and 5 acres (AG) (§28-35.A) |
Permit Process & Fees [4][5][6][7][8][9]
An ADU permit in Avondale goes through a standard permit review. Typical timeline: Building applications: 16 business days for the first review and 8 for each subsequent review (Development Services review-timeline sheet, revised 10/31/2024). City business days are Monday-Thursday, and a submittal after 3 PM starts the clock the next business day. Permit fees: FY2027 schedule (eff. 9/1/2026): permit $1,247 + $8 per $1,000 of valuation over $100,000, plan review 65% of that, $102 application fee, $158 C of O — about $2,400 for a 600 sq ft casita valued near $106,000 and $3,320 at 1,000 sq ft (~$176,000). Impact fees are separate.
| Approval Process | One application: a Residential Building Permit through Avondale's Accela Citizen Access portal, choosing 'Accessory Dwelling Unit' as the application type; zoning compliance with §28-33(a) is checked inside the building plan review, so there is no separate zoning clearance (city ADU permitting guide, May 6, 2026). Permitted with conditions — by right if the §28-33(a) conditions are met, though staff may add health-and-safety conditions at site plan review (§28-33). Construction may start only after the permit issues, and a Certificate of Occupancy ($158) is required before anyone moves in. The city recommends calling Development Services at (623) 333-4000 before submitting |
| Review Timeline | Building applications: 16 business days for the first review and 8 for each subsequent review (Development Services review-timeline sheet, revised 10/31/2024). City business days are Monday-Thursday, and a submittal after 3 PM starts the clock the next business day |
| Permit Fees | FY2027 schedule (eff. 9/1/2026): permit $1,247 + $8 per $1,000 of valuation over $100,000, plan review 65% of that, $102 application fee, $158 C of O — about $2,400 for a 600 sq ft casita valued near $106,000 and $3,320 at 1,000 sq ft (~$176,000). Impact fees are separate |
| Impact Fees | Yes — §28-33(a)(2)(D) treats an ADU as a separate or new dwelling unit for water, sewer and power service 'including the calculation of fees'. FY2027 schedule (eff. 9/1/2026): water $3,519 + sewer $10,854 per dwelling unit = $14,373 (sewer rose from $3,503 on 5/9/2026). Fire, parks, police and streets add $5,524 at the '2+ unit' rate or $7,760 at the 'single unit' rate if Finance applies them to an ADU — the schedule has no ADU line, so get a written estimate before signing a contract |
| Plan Check | Full residential plan review under the 2024 International Residential Code with Avondale amendments (Ord. 2046-1225, 12-1-25); valuation is set from the ICC Building Valuation Data table, with the Chief Building Official's figure final (IBC §109.3 as amended). The city may not require a commercial building code or a fire sprinkler (§28-33(a)(11); A.R.S. §9-461.18(D)); the amended IRC R309 makes sprinklers optional in one- and two-family dwellings. The ADU must connect to the house's utilities, the owner must show the services are adequate and upgrade them if not, and it may not sit on a utility easement without each easement holder's written consent (§28-33(a)(6)) |
| Pre-Approved Plans | None available yet — Avondale has set up a Preapproved Housing Design Plan Program under A.R.S. §9-461.20 (Class 4: ADUs of exactly 200, 600 or 1,000 sq ft, at least three elevations per plan), but its Preapproved Plan Library said 'no preapproved residential plans available right now' on September 20, 2026. Users of a preapproved plan still pay permit and impact fees, may owe a design fee to the plan's author, and must sign a use-authorization and indemnification form |
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Construction Costs [10][11][12]
Building an ADU in Avondale typically costs $150,000-$280,000 ($175-$350 per sq ft); a garage conversion runs $80,000-$150,000.
See what this means for your lot — ask Avondale ADU builders for a quote →
| Average Build Cost | $150,000-$280,000 |
| Cost per Sq Ft | $175-$350 |
| Garage Conversion | $80,000-$150,000 |
| Prefab ADU (Installed) | $150,000-$300,000 |
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Rental Income Potential [13][14][15][16]
A 2-bedroom ADU in Avondale rents for around $1,650-$1,950/mo, an estimated 6-11% gross rental yield.
| Avg Rent (1 Bedroom) | $1,400-$1,700/mo |
| Avg Rent (2 Bedroom) | $1,650-$1,950/mo |
| Short-Term Rental | Only if you live on the property: an ADU issued a certificate of occupancy on or after September 14, 2024 may not be used as a vacation or short-term rental unless the owner resides on the same property (§28-33(a)(7)); o. |
| Est. Annual ROI | 6-11% gross rental yield |
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Recent Law Changes
What's Changed Recently
- Verified September 20, 2026 against the code as codified through Ordinance No. 2021-0726 (adopted July 6, 2026; Supp. No. 38, Update 1): §28-33(a)'s history line still ends with Ord. No. 2032-1124, §3, 11-18-24, so the ADU rules have not been amended since adoption, and Municode lists no pending ordinances
- Sewer impact fee tripled: the FY2027 Rates & Fees Schedule (effective September 1, 2026) carries a residential wastewater development impact fee of $10,854 per dwelling unit dated 5/9/2026, up from $3,503, following the Land Use Assumptions and Infrastructure Improvements Plan adopted by Resolution 1069-1125 on November 17, 2025; water stays $3,519. Because §28-33(a)(2)(D) counts an ADU as a new dwelling unit for these fees, a casita now carries $14,373 in utility impact fees before fire, parks, police and streets
- Ordinance No. 2043-1125 (November 17, 2025) added Article 14, Middle Housing (§§28-321 to 28-324), allowing duplexes, triplexes, fourplexes and townhomes as a permitted use on single-family lots within one mile of the central business district and on 20% of new developments over 10 acres, per A.R.S. §9-462.13 — note that an ADU is not permitted on a lot with a duplex or townhome (§28-33(a)(3)(B)), so converting to middle housing forfeits the ADU allowance
- Ordinance No. 2046-1225 (December 1, 2025) adopted the 2024 International Building, Residential, Plumbing, Mechanical, Fuel Gas, Energy and Existing Building Codes and the 2023 NEC with local amendments; permit valuation now follows the ICC Building Valuation Data table, and the amended IRC R309 keeps fire sprinklers optional in one- and two-family dwellings
- Avondale established a Preapproved Housing Design Plan Program under A.R.S. §9-461.20 with a Class 4 for ADUs of exactly 200, 600 or 1,000 sq ft; as of September 20, 2026 the online Preapproved Plan Library holds no plans
- Ordinance No. 2032-1124, adopted November 18, 2024, rewrote §28-33(a) to allow accessory dwelling units under A.R.S. §9-461.18 ahead of the January 1, 2025 deadline and removed new guest houses as a permitted use; A.R.S. §9-461.18 (HB 2720) binds every municipality over 75,000 people, and Avondale's 96,609 residents (Census Vintage 2024) put it inside the mandate
- State law bars the city from requiring extra parking or in-lieu fees, exterior design matching, street improvements, a city-imposed restrictive covenant, or rear/side setbacks over 5 feet (A.R.S. §9-461.18(B)); Avondale's ordinance mirrors each of these in §28-33(a)(3)(D), (J), (K) and (5)
- Short-term rentals have been licensed under City Code Chapter 13, Article IX since Ordinance No. 2060-1023 (October 23, 2023); the licence fee is $250 per rental per year (Res. 1029-0623, effective February 1, 2024)
Tips for Building an ADU in Avondale
- Measure your house before you design: the cap is the lesser of 1,000 sq ft or 75% of your home's interior habitable area (§28-33(a)(3)(A)), so a 1,200 sq ft house limits the casita to 900 sq ft and only a house of 1,334 sq ft or more gets the full 1,000
- Budget the impact fees as if you were building a new house: $3,519 water plus $10,854 sewer per dwelling unit on the FY2027 schedule, and possibly $5,524-$7,760 more for fire, parks, police and streets — ask the Finance Department for a written estimate before you sign a contract, and note the single-family deferral option in City Code §26-12 applies through a development agreement, not to a homeowner permit
- Design for two bedrooms at most — the cap is written into the ordinance (§28-33(a)(3)(G)), and a residential variance ($211 on the FY2027 schedule) requires a hardship finding, not a preference
- Check lot coverage before you assume the full 1,000 sq ft: on a 6,000 sq ft R1-6 lot the 45% cap allows 2,700 sq ft of building footprint for the house, garage, sheds and casita combined (§28-35.A; §28-133(f))
- If you want a vacation rental, you have to live there: a new ADU cannot be a short-term rental unless the owner resides on the property (§28-33(a)(7)), and every short-term rental needs the $250 city licence, neighbor notice and $500,000 liability cover (§§13-182 to 13-184); long-term tenants are fine either way
- Plan the entrance and egress early — the ADU needs its own entrance and a path to the street that never passes through the main house (§28-33(a)(3)(H)), which rules out some interior conversions
- Order the second house number: the ADU must have its own address visible from the street (§28-33(a)(3)(I)) — the opposite of Glendale and Goodyear, where a separate address is prohibited
- One driveway only: the ADU shares the existing driveway (§28-33(a)(3)(L)), so a second curb cut is not an option
- Check the airport territory: lots near Luke Air Force Base or Phoenix Goodyear Airport may be excluded (§28-33(a)(12)) — Avondale's exclusion has no 65-decibel qualifier, so ask for a parcel check before paying for drawings
- Submit before 3 PM on a Monday-Thursday business day so the 16-business-day first-review clock starts that day; Avondale offers expedited review at double the plan-review fee
- Cost basis: the ranges are 2026 Phoenix-metro builder guides (mid-range detached casita $150,000-$250,000, custom $250,000-$400,000+, garage conversion $80,000-$150,000, $150-$400 per sq ft, permits and fees $3,000-$12,000, utility connections $8,000-$20,000); no Avondale-specific price list exists, and West Valley bids often land toward the lower end
- Cost basis (2026-09-20 re-verification): short term allowed: Only if you live on the property: an ADU issued a certificate of occupancy on or after September 14, 2024 may not be used as a vacation or short-term rental unless the owner resides on the same property (§28-33(a)(7)); owners who can show a legal right to build an ADU on or before that date are exempt unless the three-year limit in A.R.S. §12-1134(G) has run. Any short-term rental also needs a city short-term rental licence ($250 per licence per year on the FY2027 fee schedule) under City Code §§13-180 to 13-188 (Ord. 2060-1023): state TPT licence, a 24-hour emergency contact who responds within one hour when public safety is dispatched, written notice to adjacent and across-the-street neighbors before the first booking, $500,000 liability cover unless the platform provides it, and the licence number on every listing. Long-term leasing of the ADU on its own is expressly allowed (§28-33(a)(2)(C))
ADU Builders in Avondale
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Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Avondale Code of Ordinances, Chapter 28 Zoning Ordinance — §28-33(a) Accessory dwelling units (Ord. No. 2032-1124, §3, 11-18-24); §28-32 land use matrices; §28-35 development standards; §28-133 detached accessory buildings; §28-15 definitions; Article 14 Middle Housing (Ord. No. 2043-1125, 11-17-25). Codified through Ord. No. 2021-0726, July 6, 2026 (Supp. No. 38, Update 1); read via api.municode.com CodesContent (jobId 494542, productId 13755) Municipal Code — Accessed 2026-09-20
- A.R.S. §9-461.18 — Accessory dwelling units; regulation; applicability; definitions state_statute — Accessed 2026-09-20
- A.R.S. §9-461.20 — Preapproved housing design plans (Class 4 accessory dwelling unit plans from July 1, 2026) state_statute — Accessed 2026-09-20
- Permitting an Accessory Dwelling Unit in Avondale — Development Services guide (May 6, 2026) Planning Department — Accessed 2026-09-20
- City of Avondale FY2027 Rates & Fees Schedule (effective September 1, 2026) — Development Impact Fees pp. 2-3; Building Permit Fee Tiers A-H, Building Plan Review 65%, Application Processing $102, Certificate of Occupancy $158 pp. 7-9; Planning fees pp. 11-12; Short-Term Rental License $250 p. 1 fee_schedule — Accessed 2026-09-20
- Development Services Review Timelines — plans review and permitting timeline requirements as of June 10, 2024 (revised 10/31/2024): Building Applications 16 / 8 business days Planning Department — Accessed 2026-09-20
- Preapproved Housing Design Plan Program — City of Avondale Development Services (A.R.S. §9-461.20; Class 4 ADU plans 200/600/1,000 sq ft; Preapproved Plan Library empty) Planning Department — Accessed 2026-09-20
- City of Avondale 2024 International Codes — Local Amendments (IBC §109.3 permit valuations per ICC Building Valuation Data; IRC R309 sprinklers optional); adopted by Ord. No. 2046-1225, 12-1-25 (City Code §4-2) Municipal Code — Accessed 2026-09-20
- Resolution No. 1069-1125 — Land Use Assumptions and Infrastructure Improvements Plan for the amendment of development fees (adopted November 17, 2025; Raftelis report; Figure WW6 wastewater fee $10,854 per 3/4-inch meter, existing fee $3,503) adopted_ordinance — Accessed 2026-09-20
- ADUs in Arizona: Rules, Costs, What to Know (2026) — Fenn Rogers Custom Homes, Mesa (updated May 12, 2026) industry — Accessed 2026-09-20
- How Much Does It Cost to Build a Casita in Arizona? (2026 Guide) — Rise Above Remodeling, Phoenix industry — Accessed 2026-09-20
- Prefab Modular ADU: 2026 Costs, Code Paths & Lot Fit — Dwelling Index (updated May 27, 2026) industry — Accessed 2026-09-20
- HUD FY2027 Small Area Fair Market Rents, Phoenix-Mesa-Chandler AZ MSA — ZIP 85323: 1BR $1,560, 2BR $1,810; ZIP 85392: 1BR $1,680, 2BR $1,950 (40th percentile, gross rent incl. utilities); MSA FMR 1BR $1,493, 2BR $1,734 Government Data — Accessed 2026-09-20
- RentCafe — Average Rent in Avondale, AZ (updated August 31, 2026: 1BR $1,400, 2BR $1,636; city average $1,611) Market Data — Accessed 2026-09-06
- Avondale City Code Chapter 13, Article IX — Short Term Rentals, §§13-180 to 13-188 (Ord. No. 2060-1023, 10-23-23): licensing, neighbor notification, $500,000 insurance, operations Municipal Code — Accessed 2026-09-20
- U.S. Census Bureau — Vintage 2024 Population Estimates, sub-est2024.csv (Avondale city, AZ: 96,609) Government Data — Accessed 2026-09-06
Frequently Asked Questions
Can I build an ADU in Avondale?
Yes. ADUs are allowed in Permitted with conditions (PC) in AG, RR-43, RR-18, R1-35, R1-15, R1-10, R1-8, R1-7, R1-6 and R1-5, and in R-2, R-3 and MH; prohibited in R-4 (§28-32 matrices). Only where the district allows a single-family home, never on a lot with a duplex, townhome or multi-family development (§28-33(a)(3)(B)). Excluded: tribal land and land in the vicinity of a military, FAA-licensed, general aviation or public airport (§28-33(a)(12)) — Luke AFB and Phoenix Goodyear Airport are nearby; get a parcel check in Avondale. 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 (§28-33(a)(3)(A)); for this section gross floor area means the interior habitable area of the house or the ADU (§28-33(a)(3)(A)(I)), not the exterior-wall measure in §28-15. No more than two bedrooms (§28-33(a)(3)(G)). A detached ADU counts toward the district building coverage cap: 45% in R1-8 to R1-5, 40% R1-10, 20% R1-15, 30% RR-18, 15% AG/RR-43/R1-35 (§28-33(a)(3)(E); §28-35.A; §28-133(f)). Owner-occupancy is not required, so you can rent out the ADU.
How much does an ADU cost in Avondale?
ADU construction in Avondale typically costs $150,000-$280,000. Garage conversions run $80,000-$150,000, and prefab ADUs cost $150,000-$300,000.
How much can I rent an ADU for in Avondale?
Average ADU rents in Avondale are $1,400-$1,700/mo for a 1-bedroom and $1,650-$1,950/mo for a 2-bedroom unit.
Do I need parking for an ADU in Avondale?
None — no additional parking space or in-lieu parking fee may be required for a new ADU (§28-33(a)(5); A.R.S. §9-461.18(B)(3)). But the lot may have only one driveway, shared by the house and the ADU, and a new ADU must use the existing driveway (§28-33(a)(3)(L)). Check with Avondale planning department for the latest Arizona ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Avondale?
The permit review timeline in Avondale is Building applications: 16 business days for the first review and 8 for each subsequent review (Development Services review-timeline sheet, revised 10/31/2024). City business days are Monday-Thursday, and a submittal after 3 PM starts the clock the next business day. Permit fees: FY2027 schedule (eff. 9/1/2026): permit $1,247 + $8 per $1,000 of valuation over $100,000, plan review 65% of that, $102 application fee, $158 C of O — about $2,400 for a 600 sq ft casita valued near $106,000 and $3,320 at 1,000 sq ft (~$176,000). Impact fees are separate.
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