What do Maricopa County's rural residential zoning districts (like RU-43) allow?

Outside city limits there is no municipal code to answer to. Land in unincorporated Maricopa County, including much of the Rio Verde Foothills, is governed by the county's own zoning ordinance rather than a city code, and most low-density home sites fall in a rural district such as RU-43. These districts pair a single-family home with generous lot sizes, larger setbacks, and the right to keep horses and other animals, which is exactly why so many custom-home buyers seek them out.

The county, not a city, is the authority here

If your lot is outside an incorporated city or town, Maricopa County Planning and Development administers zoning and issues the building permit. The Maricopa County Zoning Ordinance defines a family of districts; the most common rural-residential one is RU-43, where the "RU" denotes rural and the "43" refers to a minimum lot area of 43,560 square feet, which is one acre. Larger rural and residential districts exist for bigger parcels, and the exact district for any given lot is recorded on the county's zoning map.

What RU-43 typically allows

RU-43 is built around low-density rural living. In general terms it permits:

• One single-family detached home per lot, with the usual accessory buildings such as a garage, workshop, or guest house consistent with the ordinance.
• Keeping of horses and other animals. The rural designation is what allows livestock and horse privileges, subject to per-area animal limits and manure and setback rules. This is the key difference from a strictly residential district.
• Agricultural and horticultural uses appropriate to rural land.
• Home occupations within defined limits so a low-impact business does not change the residential character.

Because the minimum lot is an acre, RU-43 neighborhoods feel open, with houses set well apart. That density, plus the animal privileges, is the whole appeal for buyers who want room, a barn or arena, or simply distance from neighbors.

Setbacks, height, and lot coverage

Rural districts use larger building setbacks than typical in-town residential zoning, often on the order of several tens of feet from front, side, and rear lines, with additional separation required for animal-keeping structures. Building height is limited (commonly to roughly two stories), and lot coverage by structures is capped so the parcel keeps its open feel. The precise front, side, and rear setback figures, the maximum height, the allowed lot coverage, and the animal counts are all set in the ordinance for the specific district, so read them against your exact parcel rather than assuming. A builder or civil engineer can run a quick buildability check to confirm your floor plan fits inside the rural setback envelope.

Lot splits and how parcels get created

Rural acreage is often created or divided through lot splits. Arizona draws a bright line here: under A.R.S. 32-2101, dividing land into six or more lots is a subdivision with full platting, infrastructure, and public-report requirements, while a split into five or fewer lots is treated as a minor lot split with far lighter process. This distinction shaped how much of the Rio Verde Foothills was parceled out, and it affects what utilities, roads, and water arrangements a buyer can expect to find already in place.

Why the district matters before you buy

Two rural lots that look identical can carry different rights depending on their zoning district and overlays. Confirm the district, the minimum lot size, the setbacks, the animal privileges, and whether any floodplain or hillside overlay applies before you make an offer, because those rules drive where the house can sit, how big it can be, and whether your horses are welcome. Remember too that unincorporated lots usually rely on a well and septic, so water and onsite wastewater feasibility belong in the same due-diligence pass.

How Jematell Homes helps

We build custom homes throughout unincorporated Maricopa County and design each one to its parcel's rural zoning, working the setbacks, height, lot coverage, accessory buildings, and any animal facilities into the site plan from the start. Because Maricopa County updates its zoning ordinance and applies districts and overlays parcel by parcel, confirm the current zoning, setbacks, and animal rules with Maricopa County Planning and Development, and any applicable HOA, for your specific lot before you finalize a design.