Arizona Building Codes, Permits and Contractor Rules
Here’s every rule from our 50-state guides for Arizona on one page: the residential building code, frost depth, retaining wall permits, the 811 dig law, drainage law, contractor licensing, deposit limits, mechanics lien deadlines, workers’ comp, planting zones and frost dates. Each section links the official source and the full 50-state comparison.
Arizona at a glance
- Building code: Set by cities and counties
- Frost depth: Set locally; often 30 in.
- 811 notice: At least 2 full working days (operators must respond within 2 working days)
- Contractors: State license required
- Deposits: No statewide cap
- Liens: 120 days after completion (60 if NOC)
- Workers’ comp: 1+ employees
- Drainage rule: Unsettled
- Planting zones: 5b to 10a
| Topic | Arizona | Compare |
|---|---|---|
| Residential building code | Set by cities and counties | All states |
| Frost line depth | Set locally; often 30 in. | All states |
| Retaining wall permit | Set locally | All states |
| 811 notice before digging | At least 2 full working days (operators must respond within 2 working days) | All states |
| Contractor license | State license required | All states |
| Deposit limit | No statewide cap | All states |
| Right to cancel | 3 business days, sales made at home | All states |
| Lien filing deadline | 120 days after completion (60 if NOC) | All states |
| Workers’ comp required | 1+ employees | All states |
| Drainage between neighbors | Unsettled | All states |
| Planting zones (2023 USDA) | 5b to 10a | All states |
| Frost dates (NOAA) | Last frost early Feb (Tucson) to early Jun (Flagstaff); first frost late Sep (Flagstaff) to early Dec (Tucson); Phoenix freezes only in some winters (NCEI's 50% dates both fall in early Jan and its 50% freeze-free season is 365 days); no freeze in a typical year at the Yuma MCAS station | All states |
Arizona residential building code
- Code
- No statewide residential code; cities and counties adopt their own (often a recent IRC)
- How it applies
- Local adoption (no statewide residential code)
- Code agency
- None (no state agency sets a code for one- and two-family homes)
- Who enforces it
- Counties may adopt building codes for zoned unincorporated areas and may exempt areas zoned rural or unclassified, so some rural areas have no residential code.
- Good to know
- Arizona has no statewide house code. Your city or county sets the code, and counties may exempt rural-zoned areas from their building code.
Compare building codes in all 50 states
Frost line depth in Arizona
- Who sets it
- Local building department
- Local examples
- City of Phoenix: 0 (frost line entry in 2024 IRC amendments)
City of Tucson: 0 (frost line entry in 2024 IRC amendments)
City of Flagstaff: 30 in. - Typical range
- 0 in the low desert (Phoenix, Tucson) to 30 in. in Flagstaff
- Good to know
- In Phoenix and Tucson, a frost depth of 0 is not a footing depth, so confirm the minimum footing depth with the building department. Scottsdale requires footings at least 18 in. below undisturbed ground or engineered fill.
Frost line depth in every state
Retaining wall permits in Arizona
- Permit exemption
- Set locally
- Who decides
- Your city or county building department decides.
- Good to know
- Codes are adopted and enforced locally, and Phoenix-area communities use editions ranging from 2018 to 2024. Ask your city or county building department which rules apply.
Retaining wall permit rules in every state
811 dig law in Arizona
- One-call center
- Arizona 811
- Notice before digging
- At least 2 full working days (operators must respond within 2 working days)
- Ticket good for
- 15 working days from the date of marking
- Hand-dig zone
- 24 in. of a marked facility (expose by hand tools)
- Homeowners
- Yes. 'Excavation' covers moving earth by 'any tools, equipment or explosives' with no listed exceptions; Arizona 811 says by law you must contact it before ground-disturbing work. A person digging on single-family residential property they own or occupy is exempt only from the white-lining (pre-marking) requirement.
- The law
- A.R.S. §§ 40-360.21 to 40-360.32
- Good to know
- In apartment and mobile home parks, landlords get up to 10 working days to mark their own lines.
Drainage law and stormwater permits in Arizona
- Rule
- The law here is unsettled. Talk to an Arizona attorney about a drainage dispute.
- What we found
- Unsettled: a 1957 Arizona Supreme Court majority held an upper owner may not artificially increase the burden of surface water on the lower estate, while the dissent said Arizona follows the common-law (common enemy) approach from City of Tucson v. Dunseath; later Court of Appeals decisions treat water in washes and flood channels separately.
- Leading case
- Vantex Land and Development Co. v. Schnepf. 82 Ariz. 54, 308 P.2d 254 (1957)
- What it means for your yard
- Arizona's rule for yard runoff between neighbors is not clearly settled; the safest course is not to artificially increase or concentrate water onto a neighbor, and to talk to an Arizona attorney about any dispute.
- Construction stormwater permit
- Arizona Department of Environmental Quality (ADEQ), Water Quality Division (AZPDES): 1 or more acres of disturbance, or less than 1 acre if part of a larger common plan that will disturb 1 acre or more, discharging to protected surface waters or an MS4 (AZPDES CGP AZG2025-001, effective Aug. 29, 2025)
- State rules below 1 acre
- No statewide rule below the 1-acre permit found; check your county and town.
- Local rules
- Arizona cities and counties commonly require grading and drainage permits for residential lots.
- Good to know
- Arizona courts have not clearly settled which drainage rule applies between neighbors, so get local legal advice on a dispute. State construction stormwater permits start at 1 acre, and cities and counties often require grading and drainage permits.
Contractor licensing in Arizona
- Statewide rule
- License
- Agency
- Arizona Registrar of Contractors (ROC)
- Who needs it
- Anyone contracting for construction work of $1,000 or more, or any permitted work, needs an ROC license; exempt handymen must advertise as 'not a licensed contractor'.
- When it applies
- Work totaling $1,000 or more (labor + materials), or any job that needs a building permit
- Check a contractor
- Official lookup
- Good to know
- The handyman exemption for jobs under $1,000 (A.R.S. 32-1121(A)(14)) is lost if the job needs a building permit, is split up, or the ads don't say the person is not a licensed contractor. A 2023 bill (SB 1715) would have raised it to $2,000, but the statute still says $1,000.
Contractor license requirements in every state
Contractor deposits and your right to cancel in Arizona
- Deposit limit
- No statewide cap. The contract must state the amount of any advance deposit (A.R.S. § 32-1158(A)).
- Right to cancel
- Home solicitation sales (seller personally solicits the sale at a home without prior invitation): the buyer may cancel until midnight of the third business day after signing (A.R.S. §§ 44-5001, 44-5002).
- Written contract
- Required for contracts over $1,000 between a contractor and the property owner (A.R.S. § 32-1158). Must list the contractor's name, address and license number, the job address, date, estimated completion date, description of work, total price, the amount of any advance deposit, progress payment amounts and when they are due, and a signed notice of the owner's right to complain to the Registrar of Contractors.
- Other protections
- Residential Contractors' Recovery Fund for residential work by licensed contractors (A.R.S. § 32-1131 et seq.). The contractor must give a signed receipt for any cash paid (§ 32-1158).
- The law
- A.R.S. § 32-1158 (contract requirements); A.R.S. §§ 44-5001 to 44-5008 (home solicitation sales)
- Good to know
- Arizona doesn't cap deposits, but the written contract must state the deposit and when each progress payment is due. Work by a licensed residential contractor may be covered by the state Recovery Fund; unlicensed work is not.
Contractor deposit limits in every state
Mechanics lien deadlines in Arizona
- Lien deadline (prime)
- Record within 120 days after completion of the work of improvement, or within 60 days after the owner records a notice of completion; serve a copy on the owner if found in the county (A.R.S. § 33-993(A)). Completion is the earlier of 30 days after final inspection and acceptance or 60 straight days without work; with no permit, the last day of furnishing (§ 33-993(C)-(D)).
- Lien deadline (sub/supplier)
- Same as prime, but no lien on an owner-occupant's dwelling unless the claimant had a written contract directly with that owner (A.R.S. § 33-1002).
- Preliminary notice (sub/supplier)
- Required. Same preliminary 20-day notice (A.R.S. § 33-992.01). On an owner-occupant's dwelling, though, subs and suppliers have no lien unless they contracted in writing directly with the owner (A.R.S. § 33-1002).
- Notice of intent
- Not required.
- Enforce within
- Action to enforce within 6 months after recording, plus a recorded notice of pendency of action; otherwise the lien expires (A.R.S. § 33-998(A)).
- Homeowner rules
- No lien may be recorded against the dwelling (one- or two-family home or condo) of a natural person who was the owner-occupant before work began, except by a claimant with a written contract directly with that owner. Waivers of this protection are void (A.R.S. § 33-1002).
- The law
- A.R.S. Title 33, Ch. 7, Art. 6 (Mechanics' and materialmen's liens), § 33-981 et seq.
- Good to know
- Arizona subcontractors and suppliers cannot lien an owner-occupied home unless they had a written contract directly with the homeowner. Other claimants except wage laborers, including the prime contractor, must send the preliminary 20-day notice to keep full lien rights.
Mechanics lien deadlines in every state
Workers' comp requirements in Arizona
- Who must carry it
- Any employer who regularly employs workers in its business, full- or part-time, regardless of number (A.R.S. § 23-902(A); ICA Employers' FAQ). Domestic servants and casual workers outside the usual business are excepted. No separate construction rule.
- Owners and officers
- A sole proprietor with no employees need not insure himself or herself but may elect coverage (ICA Employers' FAQ) and may waive coverage (A.R.S. § 23-961(N), referenced in § 23-902(E)); a business using a sole proprietor who has waived is not liable for that person (§ 23-902(E)). A corporation's or LLC's employees may include its officers, directors, shareholders, members and managing members (ICA FAQ).
- Subcontractors
- A business that hires a contractor it supervises or controls, for work that is part of its regular trade or business, is the statutory employer of the contractor's and subcontractors' employees (A.R.S. § 23-902(B)).
- Homeowners
- Domestic servants are excepted (A.R.S. § 23-902(A)). The statutory-employer rule only reaches work that is part of the hiring party's own trade or business, so it generally does not make a homeowner the employer of a contractor's crew.
- Penalties
- If the Commission finds an employer uninsured it can impose a civil penalty of up to $1,000, up to $5,000 for a second failure and up to $10,000 for a third within five years; if the Special Fund pays a claim, the employer owes it back plus a penalty of 10% or $1,000, whichever is greater; the Commission can seek an injunction stopping the business until it complies (A.R.S. § 23-907). The ICA FAQ (rev. 11/2015) also says an uninsured employer is guilty of a class 6 felony (A.R.S. § 23-932).
- The law
- A.R.S. Title 23, Ch. 6; §§ 23-902 (employers subject; statutory employer), 23-907 (uninsured employers), 23-932
- State agency
- Industrial Commission of Arizona (ICA)
- Good to know
- Arizona requires coverage for any regular employee, even part-time. If you hire a sub to do part of your own trade's work and control the job, you can be treated as that sub's employer for comp purposes.
Workers' comp requirements in every state
Planting zones in Arizona
- 2023 USDA zones
- 5b to 10a
- Coldest-night range
- −15°F to 35°F
- Warmest area
- Phoenix metro and the lower Colorado River valley (e.g., Yuma)
- Example cities
- Phoenix: 10a, Tucson: 9b, Flagstaff: 6a, Yuma: 10a
- Local plant advice
- University of Arizona Cooperative Extension
- Good to know
- Arizona's zones changed little on the 2023 map. Elevation matters more than latitude: the low deserts around Phoenix and Yuma are 10a, Tucson is 9b, and Flagstaff on the Colorado Plateau is 6a.
Frost dates in Arizona
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Phoenix Low desert. Freezes only in some winters: NOAA gives this station a 365-day typical frost-free season, and both typical dates fall in early January. | January 5 | January 3 (next year) | 365 |
| Tucson Low desert, southern Arizona | February 5 | December 9 | 307 |
| Flagstaff High country | June 4 | September 28 | 115 |
| Yuma Lower Colorado River valley (Marine Corps Air Station Yuma) | No freeze in a typical year | 365 | |
- Typical range
- Last frost early Feb (Tucson) to early Jun (Flagstaff); first frost late Sep (Flagstaff) to early Dec (Tucson); Phoenix freezes only in some winters (NCEI's 50% dates both fall in early Jan and its 50% freeze-free season is 365 days); no freeze in a typical year at the Yuma MCAS station
- Good to know
- These are typical (50%) dates from NOAA's 1991–2020 climate normals, so about half of years still bring a 32°F night after the listed spring date. In Arizona, the last spring frost at the stations listed ranges from early February around Tucson to early June around Flagstaff; Phoenix freezes only in some winters, and NOAA's main Yuma station (the Marine Corps air station) shows no freeze in a typical year.
- Local frost or planting guide
- University of Arizona Cooperative Extension
Frequently Asked Questions
What building code does Arizona use?
No statewide residential code; cities and counties adopt their own (often a recent IRC). It applies as follows: local adoption (no statewide residential code). Your local building department can confirm the edition and amendments for your address.
How deep is the frost line in Arizona?
Frost depth is set by local building departments. Typical local values: 0 in the low desert (Phoenix, Tucson) to 30 in. in Flagstaff. Footings for houses, additions and attached decks go below it.
How much can a contractor ask for up front in Arizona?
No statewide cap. The contract must state the amount of any advance deposit (A.R.S. § 32-1158(A)). Cancel rights: Home solicitation sales (seller personally solicits the sale at a home without prior invitation): the buyer may cancel until midnight of the third business day after signing (A.R.S. §§ 44-5001, 44-5002).
How long does a contractor have to file a mechanics lien in Arizona?
Record within 120 days after completion of the work of improvement, or within 60 days after the owner records a notice of completion; serve a copy on the owner if found in the county (A.R.S. § 33-993(A)). Completion is the earlier of 30 days after final inspection and acceptance or 60 straight days without work; with no permit, the last day of furnishing (§ 33-993(C)-(D)). Subcontractors and suppliers may have different notice rules; see the section above.
What planting zone is Arizona?
On the 2023 USDA map, Arizona runs from zone 5b to 10a. Examples: Phoenix 10a, Tucson 9b, Flagstaff 6a. Enter your ZIP on the USDA map for your exact zone.
Do contractors need workers' comp in Arizona?
Any employer who regularly employs workers in its business, full- or part-time, regardless of number (A.R.S. § 23-902(A); ICA Employers’ FAQ). Domestic servants and casual workers outside the usual business are excepted. No separate construction rule. Owner exemptions and subcontractor rules are in the workers’ comp section above.
When is the last frost in Arizona?
At the NOAA stations we list: Last frost early Feb (Tucson) to early Jun (Flagstaff); first frost late Sep (Flagstaff) to early Dec (Tucson); Phoenix freezes only in some winters (NCEI’s 50% dates both fall in early Jan and its 50% freeze-free season is 365 days); no freeze in a typical year at the Yuma MCAS station. These are typical (50%) dates from the 1991–2020 climate normals, so about half of years still bring a 32°F night after the spring date.
This page is general information, not legal or tax advice. Rules change; the agencies and statutes linked above have the final word.
Arizona in each 50-state guide: Frost line depth · 811 dig laws · Retaining wall permits · Contractor licensing · Contractor deposit limits · Building codes · Planting zones · Mechanics lien deadlines · Workers' comp · Frost dates · Drainage laws · Noxious weed laws · Rainfall and snowfall · Landscaper pay · Pesticide applicator licensing · Landscaping sales tax · All state guides
Last checked October 31 and November 1, 2026 against official state and local sources for this state. Rules change; your state agency or local building department has the final word. Spot something out of date? Email info@muthlerlandscaping.com and we’ll fix it.
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Cite as: Muthler Landscaping & Construction, “Arizona Building Codes, Permits and Contractor Rules,” https://muthlerlandscaping.com/state-guides/arizona/ (last checked November 9, 2026).
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