How do I buy land to build a house in Arizona?

A raw lot can legally hold a home only if it clears a short list of checks, and running that list before you sign is what separates a smart land buy from a costly mistake. Confirm the zoning, the minimum lot size, the water source, the septic feasibility, and the legal access first. In unincorporated county areas, state law gives you a paper trail: under A.R.S. 33-422, the seller must hand you an affidavit of disclosure that covers access, soil conditions, flooding, and utilities. Use your due diligence window to verify each item with the county and the water provider, because raw land can carry costs and limits that are invisible at first look.

Step one: confirm zoning and lot size

Before anything else, confirm the lot is zoned for a single-family home and is large enough to build one. Zoning is the county or city rule that says what you can build on a parcel. In unincorporated Maricopa County, common rural zoning includes Rural-43, which allows one single-family home per 43,560 square feet (one acre), and Rural-190, which requires 190,000 square feet (about 4.36 acres) per home.

Call the planning department that has jurisdiction and ask three questions. Is a single-family home a permitted use? What is the minimum lot size and the required setbacks? Are there overlay rules, like a hillside or wash restriction, that limit where the house can sit? In Maricopa County, the Planning and Development Department handles zoning and entitlement for unincorporated land.

Setbacks matter more than buyers expect. A wide lot with a deep wash or a steep slope can shrink the buildable area to a fraction of the acreage. Get the buildable envelope clear before you fall in love with the view.

Watch for deed restrictions too. Some rural parcels carry covenants or HOA rules that cap home size, ban certain materials, or require a minimum square footage. Zoning is the county's rule. A covenant is a private rule that rides with the land. Both can limit your home, so ask the title company for the full set of recorded restrictions before you close.

Step two: water, septic, and power

The biggest hidden cost on rural land is getting water, waste, and power to the home. A lot with no city utilities needs a private well, a septic system, and a power connection, and each one adds cost and time.

• Water. If no water provider serves the lot, you drill a private well. In some Arizona areas you also confirm a long-term supply. The Arizona Department of Water Resources (ADWR) manages assured and adequate water supply rules, and some counties require a 100-year adequacy determination before a final plat. Ask whether a designated provider serves the area or whether a well is your only option.
• Septic. A lot without a sewer line needs an onsite septic system, which requires a soil and percolation test to size it. Poor soil or a high water table can rule out a standard system and force a costlier alternative.
• Power. Confirm how far the nearest utility line runs. A long line extension across desert can cost tens of thousands of dollars, paid by you.

Budget real numbers here. A well, a septic system, and a power drop can add 40,000 to 100,000 dollars or more before the house even starts, depending on depth and distance.

Order matters with these. A well can take weeks to permit and drill. A septic design waits on a soil test. A power line extension can wait on the utility's own schedule. Start all three early, because any one of them can hold up the build. On a rural lot, site work like this often takes longer than framing the house itself.

Step three: read the affidavit of disclosure

Arizona law gives you a seller disclosure document on most rural land splits, and you should read every line of it. A.R.S. 33-422 applies to the sale of "five or fewer parcels of land, other than subdivided land, in an unincorporated area of a county." It requires the seller to give you an affidavit of disclosure before the sale.

That affidavit covers the exact items that make or break a rural build:

• Legal and physical access, and whether the road is public, private, or unmaintained
• Whether a standard passenger vehicle can reach the property
• FEMA floodplain designation
• Soil conditions, including fissures or expansive soils
• Utility availability for water, sewer, electric, gas, phone, and cable
• The water source, including well type or whether water must be hauled
• Septic status and whether a percolation test has been done
• Zoning and subdivision law compliance

The seller must give you the affidavit at least seven days before the transfer, and you get five days to rescind after you receive it. Treat that document as a checklist, not a formality. If it shows no legal access or no perc test, you have work to do before the lot is buildable.

Step four: line up the build before you close

The smartest land buyers know how they will build before they own the dirt. A lot is only worth what you can put on it, so price the home and the site work alongside the land. Talk to a builder early. A walk of the lot can reveal grading, drainage, and access costs that change the math.

Two checks save the most pain. First, confirm legal access in writing, ideally a recorded easement or frontage on a public road. A landlocked parcel with only a handshake easement is a lawsuit waiting to happen. Second, get the soil and percolation testing done during your due diligence window, not after closing, so a failed perc test does not leave you holding unbuildable land.

This is where working with a build-on-your-lot builder helps. A builder like Jematell Homes can walk a candidate lot with you, flag the site costs, and tell you what the finished home will realistically run before you commit. Buying the land and planning the home as one decision is how you avoid paying for acreage you cannot actually build on.

Financing land is its own step, and it works differently than a home loan. Many banks treat raw land as higher risk. They often want a larger down payment, sometimes 20 to 50 percent, and they charge a higher rate than a standard mortgage. Some buyers use a construction loan that rolls the land and the build into one. Others pay cash for the lot and finance only the house. Sort out your financing path before you make an offer, so a lender surprise does not kill the deal after you are already under contract.

When you confirm zoning, water, septic, access, and the affidavit details up front, you turn a risky raw-land purchase into a clear plan. Do the homework inside your due diligence window, get the key items in writing, and price the full build, not just the lot. The lots that look like a bargain are often the ones with a hidden access or water problem, so the cheapest land is not always the cheapest house. Patience and good homework here pay off for years to come.

The Jematell Homes approach

We run the land due diligence before you commit to a lot. Reach out and we will talk through how this applies to your specific lot and plan.

Sources

• A.R.S. 33-422 (Land divisions; recording; affidavit of disclosure)
• Arizona Department of Water Resources: Assured and Adequate Water Supply overview
• Maricopa County Planning & Development
• Maricopa County Residential Construction permits