Zoning, building permits and septic rules in Town of Mammoth, Arizona

Town of Mammoth’s own rules

• Building permitRequired

  Buildings moved onto a premises inside the Town of Mammoth (relocated structures). This is the only general building-permit rule found; it does not cover new construction generally.

  • Applies to structures erected on any premises inside or outside the town and then moved within the town limits.
  • Requires a permit for removal and a zoning compliance certificate for the relocation, issued by the zoning administrator.

  “no building or structure which has been wholly or partially erected on any premises located either within or outside the town shall be moved to or be placed upon any premises located within the town until a permit for such removal and a zoning compliance certificate for such relocation, shall have been issued by the zoning administrator.”

• Certificate of occupancyRequired

  Buildings moved onto a premises inside the Town of Mammoth (relocated structures). Not established for new construction.

  • The structure may not be used or occupied until an occupancy permit has been issued under Article 14-23.

  “no such building or structure shall be used or occupied until an occupancy permit has been issued, as provided in article 14-23 of this ordinance.”

• Local zoningPresent (with conditions)

  Land inside the Town of Mammoth limits (Pinal County, AZ). The Town adopts and administers its own zoning ordinance (Chapter 14 land codes, Ordinance No. 178 per the Town land-codes index).

  • Uses, heights, and yards are regulated by district; see the district-specific claims.
  • The official zoning map is kept in the town clerk's office and controls over purported copies (14-3-2). The map itself was not opened.

  “the location and boundaries of each of the zones are shown on the official 'zoning map" of the town of mammoth, arizona and said map is hereby declared to be an official record and a part of this ordinance”

• Zoning districtsPartial

  Zoning districts inside the Town of Mammoth limits

  • Section 14-3-1 names the districts: R (residential), CD (cluster development), MHP (mobile home park), C (commercial), and IND-1 (light industrial).
  • The official zoning map was not opened, so parcel-level district assignments are not established here.

  “the use, height, and area regulations are uniform in each district, and said districts shall be known as: r cd mhp c ind-1 residential cluster development mobile home park commercial light industrial”

• Minimum dwelling sizeSpecified

  Manufactured homes on individual lots in the R (residential) district inside the Town of Mammoth, outside a manufactured home park. No general minimum dwelling size for site-built homes was found in the opened R-district text.

  • Applies only to manufactured homes placed outside a manufactured home park.

  minimum width x length: 20 x 40 feet (manufactured homes outside a manufactured home park in the R district)

  “4. manufactured homes no older than 25 years at the time of placement and twenty (20’) x forty (40’) minimum on individual lots outside of a manufactured home park with regulations as outlined in article 14-4 section 3.”

• Minimum lot sizeSpecified

  R (residential) district inside the Town of Mammoth, single-family dwelling lots

  • Two-family dwellings require 8,000 square feet (Section 14-4-3 item 2(b)); minimum lot width is 60 linear feet for a single-family dwelling and 80 linear feet for a two-family dwelling (item 3).
  • Lots of record that were nonconforming when the ordinance took effect may still be used (Section 14-11-9).

  minimum lot area, single-family dwelling: >= 6000 square feet

  “2. the minimum lot area shall be: (a) 6,000 square feet for a single-family dwelling. (b) 8,000 square feet for a two-family dwelling.”

  One more reviewed finding on this topic

  • Specified — MHP (manufactured home park) district inside the Town of Mammoth

    “1. the minimum area for a manufactured home park shall be three (3) acres. 2. minimum lot size shall be 5,000 square feet.”

• SetbacksSpecified

  R (residential) district inside the Town of Mammoth

  • Side yard: where lots have double frontage, the required front yard applies on both streets.
  • Rear yard: 10 feet when an alley is present.
  • Accessory buildings have separate setbacks (Section 14-11-5; 14-4-2 item a.13).

  front yard: >= 20 feet · side yard: >= 10 feet (double frontage lots use front yard on both streets) · rear yard: >= 20 feet (10 feet when an alley is the rear boundary)

  “4. front yard setback: (a) the minimum front yard setback shall be 20 feet. 5. side yard setback: (a) the minimum side yard setback shall be 10 feet, except where lots have a double frontage, than the required front yard shall be provided on both streets. 6. rear yard setback: (a) the minimum rear yard setback shall be 20 feet, except when an alley is the minimum setback shall be 10 feet.”

  One more reviewed finding on this topic

  • Specified — MHP (manufactured home park) district inside the Town of Mammoth

    “4. minimum side yard set back from lot line shall be six feet (6’) on interior lots and twelve feet (12’) on exterior lot lines.”

• Lot coverageSpecified

  MHP (manufactured home park) district inside the Town of Mammoth

  • Thirty percent on an exterior lot; thirty-five percent on an interior lot.

  maximum lot coverage, exterior lot: <= 30 percent · maximum lot coverage, interior lot: <= 35 percent

  “6. maximum lot coverage shall not exceed thirty percent (30%) on an exterior lot or thirty five percent (35%) on an interior lot.”

• Building heightSpecified

  R (residential) district inside the Town of Mammoth

  • Height limit excludes a basement.

  maximum building height: <= 2 stories (not to exceed 40 feet, excluding a basement) · maximum building height: <= 40 feet (excluding a basement)

  “1. maximum building height shall be two stories, not to exceed 40 feet, excluding a basement.”

  One more reviewed finding on this topic

  • Specified — MHP (manufactured home park) district inside the Town of Mammoth

    “7. the maximum height of any structure shall not exceed twenty feet (20’)”

• Manufactured homesLimited

  Manufactured homes on individual lots in the R (residential) district inside the Town of Mammoth, outside a manufactured home park

  • Home no older than 25 years at the time of placement.
  • Minimum size of 20 ft by 40 ft.
  • Subject to regulations in Article 14-4 Section 3; the mobile-home skirting rule applies.

  maximum age at placement: <= 25 years

  “4. manufactured homes no older than 25 years at the time of placement and twenty (20’) x forty (40’) minimum on individual lots outside of a manufactured home park with regulations as outlined in article 14-4 section 3.”

  One more reviewed finding on this topic

  • Allowed (with conditions) — Manufactured homes in the MHP (manufactured home park) district inside the Town of Mammoth

    “2. manufactured homes, not more than one (1) unit per lot in a subdivision.”

• Mandatory utility hookupConditional

  Manufactured home park (MHP) district inside the Town of Mammoth. The rule places utility provision on the owner or developer; it is not a general connect-to-sewer mandate for single-family homes.

  • The owner or developer must provide water, sewage disposal, gas, and electric to each lot in an MHP development.
  • No general rule requiring a new single-family home to connect to public water or sewer was found; the R district section did not state one.

  “13. it is the responsibility of the owner and/or developer to provide major utilities (water, sewage disposal, gas and electric) to each lot.”

• Building in a floodplainRequired

  Development inside regulatory flood plain and erosion hazard areas within the Town of Mammoth limits

  • The Town flood plain ordinance is stated to be consistent with and subject to the Pinal County flood plain regulations; the county regulations were not opened.
  • The flood plain provisions are described as applying to development in the Town limits for detention and retention purposes.

  “this ordinance and all amendments hereto shall be consistent with and subject to the regulations and provisions of the flood plain regulations of pinal county. this ordinance shall apply within regulatory flood plain and erosion hazard areas and for purposes of the detention/retention provisions shall apply to development in the mammoth town limits.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Mammoth or Pinal County directly.

• Owner-builder exemption — Owner-builder exemption inside the Town of Mammoth
• Building code adopted — Building code adoption inside the Town of Mammoth
• Inspections — Building inspections inside the Town of Mammoth
• Living in an RV — Long-term RV occupancy on private land inside the Town of Mammoth
• Camping on your land — Temporary camping inside the Town of Mammoth

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.