To subdivide land in Arizona, you divide a parcel into lots through your city or county, which usually means a preliminary plat, engineering plans, a recorded final plat and proof of water. If the division creates six or more lots, it is also a subdivision under state real estate law, and you cannot sell lots until the Arizona Department of Real Estate (ADRE) issues a public report.
Which rules apply depends on lot count
Arizona uses different thresholds in different statutes, and that trips up owners. Read these before you plan a layout.
- ADRE (state real estate law). Under A.R.S. 32-2101, subdivided land is land divided, or proposed to be divided, for sale or lease into six or more lots, parcels or fractional interests. Lots that are each 36 acres or more are exempt. So is a sale made ten or more years after another sale, where the earlier parcel is treated as independent, unless the commissioner finds evidence of intent to subdivide.
- Cities and towns. A.R.S. 9-463.02 treats land divided into four or more lots, tracts or parcels for sale, lease or financing as a subdivision. Two or more parcels count if a new street is involved.
- Counties. A.R.S. 11-831 lets counties review divisions of five or fewer lots, any of which is ten acres or smaller, through staff review. That statute also makes acting in concert to divide land into six or more parcels unlawful, including through a series of owners or conveyances.
This article focuses on true subdivisions. Smaller splits follow the lighter county or city land division route described below.
The smaller-split route
For five or fewer lots where any lot is ten acres or smaller, A.R.S. 11-831 sets a short list of tests:
- Each lot meets the minimum acreage and dimensions in the county zoning ordinance.
- A title report or other document shows legal access.
- A licensed surveyor or engineer states whether each lot is reachable by a two-wheel-drive passenger vehicle.
- Utility easements of eight feet are reserved where needed.
- The applicant signs an affidavit about the anti-evasion rule.
If a county does not finish its review within 30 days of the request, approval is deemed granted. A county cannot require a public hearing for five or fewer lots. These rules exist so that a small split does not become an unplatted subdivision by accident.
Step 1: Confirm zoning, access and water before you design
Start with the zoning district, minimum lot size, legal access and water. Lot size and frontage are fixed by zoning, so a layout that ignores them fails at the first review. If the zoning does not allow the lots you want, rezoning comes first. Our guide to how to rezone property in Arizona covers that path.
Water can decide the project. Inside an Active Management Area, a final plat for subdivided lands needs a certificate of assured water supply or a written water service commitment from a designated provider. Outside an AMA, the director of the Arizona Department of Water Resources (ADWR) must find an adequate supply where a city, town or county has adopted that requirement. Our overview of assured water supply in Arizona goes deeper.
Step 2: File the preliminary plat
For cities, A.R.S. 9-463.01 makes an approved preliminary plat a condition precedent to submitting a final plat. The city sets form, content and review procedure by ordinance. The preliminary plat is where the city tests the layout:
- Street design and access.
- Lot sizes and dimensions.
- Drainage and flood control.
- Sewer and water.
- Any dedications the city requires.
The statute lets a city refuse or condition subdivision on land with hazards such as bad topography, flooding, poor soils or a high water table. It also allows reservations of land for parks, recreation, school sites and fire stations, but only for preliminary plats filed at least 30 days after the relevant plan was adopted. A public agency then has one year after the final plat records to agree to buy the reserved land.
For ten or fewer lots, cities and counties may waive the preliminary plat requirement. They may also reduce infrastructure standards in proportion to the subdivision's impact, but they cannot waive dust-controlled access or minimum drainage. See preliminary plat vs. final plat for the differences in what each stage requires.
Step 3: Engineering, improvements and assurances
Before a final plat records, a city subdivider must submit acceptable engineering plans for streets, sewer, electric, water, drainage and flood control (A.R.S. 9-463.01). County rules must say how far streets are graded and improved and how far utilities are installed, and those improvements are a condition precedent to final plat approval (A.R.S. 11-821).
You do not have to build every improvement before the plat records. Both statutes require performance bonds or other suitable security to guarantee that improvements are built to standard. A city may also let an applicant request a hold on a certificate of occupancy as security. The exact form and amount are set by local ordinance, so ask the planning office.
Step 4: Record the final plat
The governing body hears, approves or rejects, and records the final plat. The plat must carry a note stating whether the water supply is assured or adequate, or whether a service commitment exists. Local review times for preliminary and final plats are set by each city or county, not by statute.
Step 5: Get the ADRE public report
For six or more lots, ADRE is the last gate. Under A.R.S. 32-2183, the commissioner issues a public report if no grounds for denial exist. A subdivider may not sell, lease or offer lots without it. Sales made before the report is issued, or without giving the buyer a copy, can be rescinded within three years of signing.
ADRE's current application form (revised June 2025) lists these attachments, among others:
- The recorded plat.
- A title report dated within 30 days, plus vesting deeds.
- Recorded CC&Rs and the other Schedule B items from the title report.
- A permanent access letter from a title insurer, land surveyor or engineer.
- Water availability documents: an assured water supply certificate, an ADWR water report, an exemption, or proof of service from a designated provider.
- A flood and drainage report or letter, and an engineer's soils report.
- HOA articles and bylaws.
- Financial assurances for improvements that are not complete.
- The sales contract and a draft public report.
The form also requires the subdivider to disclose disciplinary history and ownership of 10 percent or more.
Where the pitfalls are
- Splitting in stages. A.R.S. 11-831 and the 32-2101 definition look through series of conveyances and common promotional plans. Contiguous land is presumed part of one plan. Cutting a parcel into pieces over several years does not avoid platting if the plan was always six lots.
- Water. A missing certificate or adequacy finding stops the final plat and the public report.
- Legal access. A lot without recorded access can fail the county access test.
- Blanket liens. The ADRE form asks for a lot release provision letter if lots are subject to a blanket encumbrance.
For the full sequence from acquisition to finished lots, see the land development process step by step and land entitlement in Arizona. Statutes and local ordinances change, and your county or city planning office and an Arizona attorney have the final word.
Selling land that needs this work
Platting a subdivision takes engineering, bonding, water proof and months of approvals. Red Dirt Property buys land as-is across all 15 Arizona counties, underwrites parcels against its own statewide parcel data, and handles entitlement after closing. There is no agent commission on our purchases. If you own acreage that could be platted, talk to us about selling.