Building and living in Cochise County, Arizona
Cochise County offers unusual flexibility for rural owner-builders. It also proves why an Arizona answer cannot stop at state law: zoning, RV occupancy, sanitation, access, floodplain approval, and final documentation are local decisions.
Best suited to a buyer who will verify the exact rural zoning, solve water and wastewater before siting the home, and deliberately choose the documentation level they need.
The county guidance reviewed here applies to unincorporated Cochise County, outside city and town limits.
Official scope source ↗The first gate
Rural-looking land is not a zoning category.
No. Every unincorporated parcel has a zoning designation, and that district controls permitted housing types, minimum lot size, and development standards.
About 90% of the county’s unincorporated area is described by the county as RU, but RU itself has multiple minimum-area districts. Other residential districts differ on manufactured homes, mobile homes, density, and RV parks.
RU-36, RU-18, RU-10, RU-4, RU-2
All single- and multiple-household dwellings in the county summary; verify the full regulation.Multiple lot-size districts
The county summary excludes mobile and manufactured homes.Multiple lot-size districts
The county summary includes manufactured but excludes mobile homes.MR-1 and MR-2 differ
Do not infer RV or manufactured-home eligibility from the category name.Obtain the parcel's exact zoning code and a zoning verification letter describing current entitlements and applicable site standards.
County zoning summary ↗The consequential choice
“Owner-builder” can mean three different things.
The county’s ordinary owner-builder route and its two rural amendment options should not be collapsed into one internet claim about “building without permits.”
Owner as contractor
Yes, subject to required permits and the owner-builder affidavit and responsibilities. Owner-building is not an exemption from zoning, permits, codes, or system approvals.
- Obtain all permits required for the project.
- Sign the owner-builder affidavit and act as the contractor responsible for the permit process.
- The county states that the affidavit affirms sole occupancy and that the home will not be offered for sale or rent within one year after completion.
- Confirm which inspections and final occupancy document apply to the selected route.
Plans reviewed, inspections limited
The county reviews construction plans. Key mechanical, electrical, plumbing, and fire inspections remain. A conditioned Certificate of Occupancy may be available.
Possible result: conditioned CONo plan review or building inspections
The owner assumes code-compliance responsibility. Non-building approvals remain, and the county states this path is not eligible for a Certificate of Occupancy.
Result: no Certificate of OccupancyEligible residential owner-builder projects in unincorporated Cochise County on parcels in zoning districts allowing no more than one dwelling per four acres and meeting all program conditions.
Zoning, floodplain, septic, well, fire, and other non-building approvals; applicable codes still govern.
The county describes a once-in-five-years limit for a residential dwelling across property owned by the participant in unincorporated Cochise County.
A future lender, insurer, appraiser, or buyer may ask for evidence the county did not create. Resolve those downstream consequences before selecting the permit path.
Read the county’s current amendment guideTemporary means temporary
Vacant land plus an RV is not the published pathway.
The county does not describe vacant-land ownership as permission for permanent RV residence. Its published pathway requires an existing principal use or construction of a principal use and an approved temporary-use permit.
With an existing principal use such as a house, the county says an owner may be eligible for RV occupancy for up to six months in a calendar year with an approved temporary-use permit.
RV occupancy may also be allowed while a principal use is being constructed, with an approved temporary-use permit.
The RV may not be rented out.
The county identifies unauthorized long-term occupancy of tents or RVs as a zoning violation.
Before buying for RV use, obtain written confirmation from Development Services for the parcel, intended dates, sanitation plan, principal use, and temporary-use permit sequence.
Sanitation reality check
Account for every drain.
A toilet choice does not answer the wastewater question. The site must support the complete treatment plan and reserve area.
Soil and site evaluation
A soil and site evaluation by a qualified evaluator must be completed before the permit application.
- Hire a qualified evaluator recognized under the program.
- The county says the evaluation uses at least three test pits: two in the primary disposal area and one in the reserve area, excavated to 12 feet.
- The evaluator identifies soil capacity and limiting conditions and designs a matching system.
- Alternative-system review may be handled by the county Health Department or ADEQ depending on the technology.
A smaller system, not no system
No. County guidance says a small septic system is still needed because kitchen drain water is not graywater under the Arizona definition.
- A composting toilet is treated as an alternative system.
- Kitchen sink and dishwasher wastewater cannot be placed in the residential graywater category described by the county fact sheet.
- A soil and site evaluator must design the remaining wastewater system.
- Submit the design and obtain the Cochise County permit before installation or operation.
Water is four investigations
A source on paper is not a dependable supply.
The county directs owners to check community-water service, existing registered wells, a new well, or a hauled-water/cistern system, with separate requirements for each path.
Community system
Map the service area, then obtain connection availability, fees, line-extension terms, and capacity in writing.
Existing well
Match the registry to the parcel and physical well. Review construction, depth, pump, recent yield, quality, sharing, and legal status.
New well
Confirm the AMA, well type, site approval, ADWR filing, licensed driller, likely depth, neighboring records, quality, and realistic budget.
Hauled water
The county lists a cistern path for low or intermittent use. Confirm source, delivery access, storage, treatment, freeze and fire needs, and building acceptance.
Parts of Cochise County are inside the Douglas and Willcox Active Management Areas.
AMA location can change the groundwater rules that matter to the project. Check the current ADWR boundary and requirements; do not treat a neighboring well as proof of what your parcel may support.
Fit it on one plan
The buildable area is what remains after every constraint overlaps.
Septic or alternative-waste approval remains required, and right-of-way and floodplain-use permits may also be required based on the parcel and proposed development.
Primary-source notebook
11 cited records, open for inspection.
Official guidance explains current administration; the underlying county code and state law still control. Confirm that each source remains current when you act.
- Fact Sheet for Septic and Composting Systems Cochise County Environmental Health Services · agency guidanceOpen source ↗
- Planning & Zoning Division Cochise County Development Services · agency guidanceOpen source ↗
- Development Services FAQs — Can I build my own home? Cochise County · agency guidanceOpen source ↗
- Owner Builder Amendment Cochise County Development Services · agency guidanceOpen source ↗
- Amendment for Rural Residential Owner-Built Dwellings Cochise County · administrative codeOpen source ↗
- Development Services FAQs — Can I live in an RV on my property? Cochise County · agency guidanceOpen source ↗
- Code Compliance Cochise County Development Services · agency guidanceOpen source ↗
- Septic Systems Cochise County Environmental Health · agency guidanceOpen source ↗
- Owner Builder FAQs — Other permits Cochise County · agency guidanceOpen source ↗
- Building Safety FAQs — How do I get potable water to my property? Cochise County · agency guidanceOpen source ↗
- Summary of Zoning Districts Cochise County Development Services · agency guidanceOpen source ↗