How Scottsdale Handles Accessory Structures: A Practical Guide

Scottsdale maintains 120 local ordinances across all categories, and 9 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Scottsdale falls on the strict-to-permissive spectrum compared to other cities.

ADU Impact Fees

Scottsdale does not impose a dedicated ADU impact fee. Ariz. Rev. Stat. Sec. 9-461.18 limits the fees Scottsdale may charge on accessory dwelling units, preventing fees that would effectively prohibit ADU construction. Standard building permit and plan-review fees through Planning & Development Services apply, calculated on construction valuation. Water and sewer development fees may apply only when new utility connections are installed.

Key details: Dedicated ADU Impact Fee: None in Scottsdale. State Cap: ARS 9-461.18 limits excessive ADU fees. Permit Fee Basis: Construction valuation. Utility Fees: Only if new connections required. Transportation Impact Fee: Not applied or reduced for ADUs.

Failure to pay required permit and connection fees blocks issuance of building permits and prevents lawful construction. Excessive fees that violate Ariz. Rev. Stat. Sec. 9-461.18 may be challenged through administrative appeal or court action. Unpermitted utility tap-ins discovered later can result in disconnection, back-billing, and code enforcement.

If you are coming from a city with tighter rules, you will find Scottsdale gives residents more flexibility on adu impact fees.

ADU Permits

Scottsdale permits accessory dwelling units by-right under Arizona Revised Statutes Sec. 9-461.18, enacted by HB 2720 in 2024 and effective January 1, 2025 for cities over 75,000 population. Scottsdale (population approximately 241,000) qualifies. The City of Scottsdale Zoning Ordinance was amended to comply. Single-family lots may have one detached and one attached ADU; lots over one acre may add a third detached ADU. Permits are issued through Planning & Development Services.

Key details: State Mandate: Ariz. Rev. Stat. 9-461.18 (HB 2720). City Code: Scottsdale Zoning Ordinance (amended 2024). Units Allowed: 1 detached + 1 attached (3 if 1+ acre). Permit Authority: Scottsdale Planning & Dev Services. ESLO Constraints: Apply in north Scottsdale.

Constructing or occupying an ADU without permits from Scottsdale Planning & Development Services violates the City building code and Zoning Ordinance, triggering stop-work orders, daily fines, and required removal or legalization. Unpermitted electrical, plumbing, or gas work creates safety risk and commonly voids homeowner insurance. Failure to obtain a final certificate of occupancy prevents lawful habitation and complicates future sale.

Scottsdale is more permissive than most cities when it comes to adu permits. That said, there are still limits.

ADU Owner Occupancy

Scottsdale may not require owner-occupancy as a condition of building or operating an accessory dwelling unit. Ariz. Rev. Stat. Sec. 9-461.18 (HB 2720) preempts owner-occupancy mandates for cities over 75,000 population. Scottsdale's ADU code amendments adopted in 2024 removed any prior owner-occupancy condition. Investor-owned ADUs are permitted on single-family lots, although ESLO and HOA constraints remain.

Key details: State Preemption: Ariz. Rev. Stat. 9-461.18 (HB 2720). Owner-Occupancy: Not required by City. Scottsdale Amendment: Adopted 2024. Investor Use: Permitted. Occupant Limits: Cannot be city-restricted beyond IBC load.

Scottsdale cannot enforce owner-occupancy as a condition of ADU permits or operation under Ariz. Rev. Stat. Sec. 9-461.18. Any attempt to impose owner-occupancy through code enforcement, business license denial, or new HOA covenants on covered ADU lots can be challenged in state court. Owners do not face City enforcement for renting the main house and ADU to separate non-related tenants.

Scottsdale is more permissive than most cities when it comes to adu owner occupancy. That said, there are still limits.

ADU Rental Restrictions

Scottsdale ADUs may be rented for long-term and short-term stays. Ariz. Rev. Stat. Sec. 9-461.18 prohibits Scottsdale from banning short-term rental of ADUs as a category. Short-term rentals (under 30 days) require a Scottsdale STR license under Scottsdale Revised Code Chapter 16, with mandatory neighbor notification, an emergency contact reachable within 60 minutes, and Transaction Privilege Tax registration. License fee is capped at $250 per state law.

Key details: Long-Term Rental: Permitted. STR Ordinance: Scottsdale Revised Code Ch. 16. STR License Required: Yes. License Fee Cap: $250 (state-imposed). Neighbor Notification: Required in writing.

Operating an unlicensed short-term rental violates Scottsdale Revised Code Chapter 16 and Ariz. Rev. Stat. Sec. 9-500.39, with escalating civil penalties up to $1,500 for a first verified violation and up to $3,500 for a third within 12 months under state law. Failure to provide neighbor notification or to maintain an emergency contact can result in license suspension. Repeat verified violations support license revocation.

ADU Rules

Scottsdale adopted Ordinance 4687 (September 2025) establishing ADU regulations under HB 2928. Up to 2 ADUs per lot (3 on 1+ acre with restricted-affordable unit). Owner must reside on-site for STR use. Separately metered utilities required. 500 sq ft cap on second/third ADUs. Six-adult occupancy cap across all dwellings.

Key details: Max ADUs: 2 per lot (3 on 1+ acre). 2nd/3rd Cap: 500 sq ft. Owner-Occupy: Required for STR use. Ordinance: 4687 (Sep 2025).

Building code violations for unpermitted construction. Zoning violation for non-compliant ADU. STR without owner-occupancy: STR license violation.

Tiny Homes

Scottsdale regulates tiny homes primarily through its Accessory Dwelling Unit (ADU) ordinance adopted in November 2024 pursuant to Arizona HB 2570 (ARS §9-462.01). ADUs between 200 and 750 square feet are permitted on single-family lots. Tiny homes on wheels are classified as recreational vehicles and cannot be used as permanent dwellings in residential zones.

Key details: ADU Ordinance: Adopted November 2024 per ARS §9-462.01 (HB 2570). ADU Size Range: 200–750 square feet. Rear/Side Setback: 5 feet from property line for detached ADUs. Separation from Main Home: Minimum 10 feet. Owner Occupancy: Required if ADU is rented or used as STR.

Unpermitted ADUs or tiny homes may face code enforcement citations, fines, and orders to remove or legalize the structure. Using a tiny home on wheels as a permanent residence violates zoning ordinances.

Shed Rules

Storage sheds in Scottsdale are regulated as accessory structures under the Zoning Ordinance. Sheds 200 square feet or less require only a site plan (no full building permit). Sheds over 200 square feet require a building permit. All sheds must comply with setback and height requirements for the zoning district.

Key details: Under 200 sq ft: Site plan required, no full building permit needed. Over 200 sq ft: Full building permit required. Side/Rear Setback: Minimum 2 feet (up to 10 ft height). Front Yard: Sheds not permitted in front yard setback. ESLO Areas: Additional restrictions on desert disturbance may apply.

Sheds built without required permits or outside setback requirements may be subject to code enforcement action, fines, and required removal or modification.

Carport Rules

The City of Scottsdale regulates carports as accessory structures under the Zoning Ordinance. Carports must comply with setback requirements based on the underlying zoning district. In most single-family residential zones (R1-R5), accessory structures require a minimum 2-foot setback from side and rear property lines, with an additional foot of setback for every foot of height above 10 feet.

Key details: Governing Code: Scottsdale Zoning Ordinance Articles V & VI. Min Side/Rear Setback: 2 feet for structures up to 10 feet tall. Height Adjustment: Add 1 foot setback per foot above 10 feet. Front Yard: Carports not permitted in front yard setback. Permit Required: Yes, building permit required for all carport construction.

Building a carport without a permit or outside of setback requirements may result in code enforcement action, required removal, or modification at the owner's expense.

Garage Conversions

Scottsdale allows garage conversions to ADUs under Ordinance 4687, provided the structure meets habitation standards including egress, ventilation, and utility connections. A building permit is required. Guest houses constructed after January 1, 2025 require a private deed restriction distinguishing them from ADUs.

Key details: Cost Range: $120K-$160K typical. Permit: Building permit required. Fire Sprinkler: Not required (state law). Deed Restrict: Guest houses post-2025.

Building code violation for unpermitted conversion. Zoning violation for non-compliant ADU. Parking violation if required spaces eliminated without approval.

The Bottom Line

Compared to many U.S. cities, Scottsdale gives residents more room on accessory structures. 3 of the 9 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

All of the above reflects Scottsdale's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.