Bolthole Index

Pima County, Arizona

Zoning, building permits and septic rules in South Tucson, Arizona

South Tucson, Arizona has its own Planning & Zoning Department, so zoning inside city limits is decided by the city, not Pima County1. The city's Development Services office reviews building plans and inspects construction2, under a building code the city adopted itself3. Septic permits are issued by Pima County on behalf of the state4.

At a glance

Zoning
City Planning & Zoning Department, not the county1
Building plans and inspections
City Development Services2
Building code
International Building Code with local amendments, adopted by the city3
Zoning districts
Published by the city (SB-1, SB-2, SR-1 and others)5
Driveway or street work
Written permit from the building official; public works must approve the plan6
Septic
Pima County issues permits for the state4
RV, tiny home, ADU rules
Not confirmed; ask the city2

Who to call

Zoning

City of South Tucson Development Services (Planning & Zoning)

Zoning, building plan review, construction inspections and permit applications inside South Tucson city limits

520-792-2424

1601 South Sixth Avenue South Tucson, AZ 85713

Septic permits

Pima County Onsite Wastewater Treatment Facilities

Septic construction and discharge authorizations and inspections for Pima County

520-724-7400

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

Going off-grid in South Tucson means bringing your own water and power. The kit we’d start with:

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Does South Tucson have zoning, and what does it mean for RVs, tiny homes and lot size?

Yes. South Tucson's own Planning & Zoning Department interprets and applies the city's General Plan and Zoning Ordinance inside city limits12. The city's zoning page names nine districts, including SB-1, SB-2, SR-1, SR-2 and SR-3, and says each district controls land use, building types and development standards5.

We could not confirm South Tucson's rules on living in an RV, tiny homes, accessory dwellings, minimum lot size, setbacks or building height. Those answers depend on the district your parcel falls in, so ask the city's Planning & Zoning Department which district applies and what it allows before you make an offer. Do not assume Pima County's rules for unincorporated land apply here; they do not.

Do you need a building permit in South Tucson, and who issues it?

The City of South Tucson, not Pima County, reviews building plans and inspects construction inside city limits2. The city adopted the International Building Code, 2018 Edition, with local amendments, as its building code3. New buildings must conform to it, and so must additions, alterations and repairs, except as the code specifically provides3.

We could not confirm the exact cutoff below which a small project needs no building permit, or whether owner-builders get any city exemption. Arizona's owner-builder law exempts owners from contractor licensing but does not remove a local building-permit requirement7. Call Development Services before you start any work.

Who do you call at the South Tucson building and zoning office?

Development Services and Planning & Zoning are handled through South Tucson City Hall at 1601 South Sixth Avenue; the office number is 520-792-24242. The Planning, Zoning and Development Services Department reviews building plans and development plans for building and zoning compliance, and the development services division handles construction inspections2.

If you drive, grade or pave a driveway, sidewalk or curb on a public street, the city code requires a written permit from the building official, and public works must approve the plan first6.

How do septic permits work inside South Tucson?

Arizona's environmental agency delegates septic permitting to the counties, and applications go to the county where the property sits4. In Pima County, the county issues a Construction Authorization before a system is built or replaced8. A property transfer also needs a septic inspection9.

We could not confirm that these Pima County steps apply word for word inside South Tucson city limits, since the county's page does not say. Most city lots connect to sewer, so confirm sewer service with the city first; if a lot is not on sewer, call Pima County's septic inspectors at 520-724-740010.

Building a home in South Tucson: the steps, in order

  1. Call South Tucson Development Services at 520-792-2424 and confirm the parcel's zoning district2.
  2. Check the district's rules for the use you want, including any RV, tiny home or accessory dwelling plans, which we could not confirm5.
  3. Confirm sewer service, or contact Pima County about septic10.
  4. Submit plans for review under the city's adopted building code3.
  5. If street or driveway work is involved, get the written permit from the building official6.
  6. Schedule construction inspections through Development Services2.

What stays with Pima County, and what to check before you buy in South Tucson?

Septic permits and inspections run through Pima County4. Pima County's floodplain use permits cover only unincorporated land, and the county says properties in some cities may get permits through those cities' offices11. South Tucson publishes its own flood-prone property search, so check the parcel there2.

For land outside the city, the rules are different: see the Pima County page for the unincorporated-area answers. Pima County's typical home value is about $343,10612 and its effective property tax rate is 0.8%13; both are county-level figures.

Watch-outs

  • We could not confirm South Tucson's rules on RV living, tiny homes, accessory dwellings, minimum lot size, setbacks or height; ask the city's Planning & Zoning Department which district your parcel is in2.
  • Pima County's rules for unincorporated land, including its tiny-home and accessory-dwelling rules, do not apply inside South Tucson city limits1.
  • We could not confirm whether Pima County's septic rules apply to South Tucson addresses in every case; confirm with Pima County's septic inspectors before you buy a lot without sewer10.

Sources

  1. Development Services and Permits (South Tucson), quoted and re-checked
  2. City of South Tucson Development Services (Planning & Zoning) (southtucsonaz.gov)
  3. Sec. 4-19. Adoption of Codes (South Tucson), quoted and re-checked
  4. Onsite Wastewater Treatment Facility | ADEQ (Arizona statewide rule), quoted and re-checked
  5. Zoning (South Tucson), quoted and re-checked
  6. Sec. 21-61. Required (South Tucson), quoted and re-checked
  7. Persons not required to be licensed; penalties; applicability (Arizona statewide rule), quoted and re-checked
  8. Onsite Wastewater Treatment Facilities, quoted and re-checked
  9. Onsite Wastewater Treatment Facilities, quoted and re-checked
  10. Pima County Onsite Wastewater Treatment Facilities (pima.gov)
  11. Permits - Pima County Regional Flood Control District, quoted and re-checked
  12. Typical home value (Zillow): Bolthole Index county data
  13. Effective property tax rate: Bolthole Index county data

Written October 16, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for South Tucson

South Tucson’s own rules

  • Building code adoptedAdopted

    Construction inside South Tucson city limits.

    • The adopted codes include local amendments and are attached to Ordinance 25-01 exhibits.
    • New buildings and structures must conform thirty days after passage and adoption of Ordinance 15-01; additions, alterations, repairs, and changes of use or occupancy must also conform except as specifically provided in the code.
    “The document entitled "International Building Code, 2018 Edition," published by the International Code Council, and local amendments, a copy of which is attached to Ord. No. 25-01 as exhibit A, is adopted by reference as the building code of the city.”
  • Local zoningPresent

    Land inside South Tucson city limits.

    • The city Planning & Zoning Department implements the city's General Plan, Zoning Ordinance, land-use regulations, and development standards.
    “The Planning & Zoning Department is responsible for providing support to the community by interpreting and implementing the General Plan, Zoning Ordinance, land use, and development regulations & Standards as adopted by the City Council.”
  • Zoning districtsPublished

    Zoning districts inside South Tucson city limits.

    • The official city zoning page identifies SB-1, SB-2, SB-2A, SI-1, SMH, SP-1, SR-1, SR-2, and SR-3 districts and describes their purposes.
    “Zoning districts in South Tucson, Arizona, are designated areas governed by specific regulations that control land use, building types, and development standards.”
  • Driveway accessRequired

    Construction, removal, widening, or grading involving a driveway or public street inside South Tucson city limits.

    • A written permit from the building official is required.
    • The permit cannot issue until a plan is approved by the director of public works.
    “It is a misdemeanor for any person to make, build, construct or remove any pavement or pavement widening, driveway, sidewalk, curb, gutter, pipeline or to grade, oil or gravel any public street of the city without first having received a written permit from the building official. No permit shall be issued until a plan has been approved by the director of public works.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask South Tucson or Pima County directly.

  • Building permit — Building construction inside South Tucson city limits.
  • Owner-builder exemption — Owner-builders constructing or reconstructing improvements inside South Tucson city limits.
  • Inspections — Building work inside South Tucson city limits.
  • Minimum dwelling size — Residential districts inside South Tucson city limits.
  • Minimum lot size — Residential districts inside South Tucson city limits.
15 more unanswered
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that South Tucson publishes no rule on the point, not that none exists. Pima County’s page lists the county offices to call.

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