Zoning, building permits and septic rules in Mexico, Missouri

Mexico’s own rules

• Building permitRequired

  Permitted renewable energy systems constructed, erected, or installed inside the City of Mexico, Missouri.

  • The applicant must pay the review fee under Sec. 42-1014 and the applicable Chapter 6 building-permit fee.
  • Plans and an engineer or architect certification are required.
  • Some systems also require a simultaneous administrative-permit application under Sec. 42-1011.

  “It shall be unlawful for any person or entity to construct, erect, and/or install any permitted renewable energy system without first applying for and obtaining a building permit”

• Building code adoptedAdopted (with conditions)

  Residential construction inside the City of Mexico, Missouri.

  • The adopted 2015 International Residential Code includes Appendices G, H, M, O, P, R, and S.
  • The code applies except as modified in Chapter 6.

  residential code edition: 2015 International Residential Code (Except as modified in Chapter 6)

  “The provisions of the 2015 edition of the International Residential Code, including Appendices G, H, M, O, P, R, and S as published by the International Code Council, except as modified in this chapter, which is on file in the office of the City Clerk of the City of Mexico, are hereby referred to, made a part hereof as fully as though set forth herein, and are adopted as the Residential Code of the City of Mexico.”

• Local zoningPresent (with conditions)

  Land inside the City of Mexico, Missouri, subject to Chapter 42 zoning districts.

  • Height and area regulations vary by listed district.

  “The required height and area regulations are established as shown in the table which follows:”

• Zoning districtsPublished (with conditions)

  Zoning districts inside the City of Mexico, Missouri.

  • The published height-and-area table identifies R-1, R-2, R-3A, R-3B, C-1, C-2, C-3, I-1, I-2, and A districts.

  “Ag | A | Industrial | I-2 | I-1 | Commercial | C-3 | C-2 | C-1 | Residential | R-3B | R-3A | R-2 | R-1 | Zoning District”

• Camping on your landAllowed (with conditions)

  Recreational-vehicle, camper, and tent camping in Lakeview Park inside the City of Mexico, Missouri.

  • Camping is limited to areas posted for recreational camping and designated sites.
  • A permit is required.
  • Permit fees are set by the city fee schedule.

  “Recreational vehicles, campers, and tent camping in Lakeview Park may be permitted in areas posted for recreational camping only and is restricted to designated sites. Permits shall be required in order to camp. Permit fees are as provided in the city fee schedule.”

• Accessory dwellingsProhibited

  Accessory buildings inside the City of Mexico, Missouri.

  • This claim addresses an accessory building used as a dwelling; it does not resolve whether another form of accessory dwelling is separately authorized.

  “No accessory building shall be used for dwelling purposes.”

• Off-grid sanitationLimited

  Temporary privies at construction sites, camp sites, or locations where crowds assemble for limited periods inside the City of Mexico, Missouri.

  • No adequate indoor facilities may be available.
  • The city manager or authorized representative must grant a permit.
  • The proposed privy must be approved by the health department before permit issuance.

  “Nothing in this division shall be construed to prohibit the city manager or his authorized representative from granting a permit for the temporary installation and use of an approved type privy on a construction site, camp site or other location where crowds assemble for limited periods and where no adequate indoor facilities are available; provided, that before the issuance of any such permit the proposed privy is approved by the health department.”

• Driveway accessRequired

  Construction or reconstruction of a driveway inside the City of Mexico, Missouri.

  • The permit is obtained from the city engineer.
  • Fees are set by the city fee schedule; no fee is charged when the driveway or sidewalk is connected with a permitted new or remodeled structure unless city engineering work is required.

  “No person shall undertake the construction or reconstruction of any sidewalk or driveway without having first obtained a permit to do so from the city engineer.”

• Permit feesVariable (with conditions)

  Residential building work inside the City of Mexico, Missouri.

  • Fees for new one- and two-family construction are assessed under the city fee schedule.
  • Fees for other work are based on total project cost at the rate in the city fee schedule.

  “Fees for new one- and two-family residential construction shall be assessed as provided in the city fee schedule. Fees for all other work shall be assessed on the total project cost at the rate as provided in the city fee schedule.”

• Permit processPartial

  Building-permit applications inside the City of Mexico, Missouri.

  • The plat must be in duplicate and drawn to scale.
  • The building official keeps a record of applications and plats.

  “Each application for a building permit shall be accompanied by a plat in duplicate, drawn to scale, showing the actual dimensions of the lot to be built upon, the size, shape and location of the building to be erected, and such other information as may be necessary to provide for the enforcement of this division.”

Rules another office applies inside Mexico

Mexico does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

• Minimum dwelling sizeSpecified

  Single-family and two-family dwellings in the R-1 Single Family District inside the City of Mexico, Missouri.

  • The required living-space square footage is determined by the average square footage of existing dwellings on each side of the street where the new dwelling will be constructed.
  • Living space must equal or exceed attached garage or storage space.

  minimum living space: >= 600 square feet (The average-square-footage rule may require more)

  “The minimum square footage of living space for a single-family and two-family dwelling shall be determined by the average square footage of living space of the existing dwellings located on each side of the street where the new dwelling is to be constructed, provided that no dwelling constructed in a residential district shall be less than 600 square feet of living space. Furthermore, the living space of a dwelling shall be equal to or greater than attached garage or storage space.”

• Minimum lot sizeSpecified

  R-1 Single-family District inside the City of Mexico, Missouri.

  minimum lot size: >= 6000 square feet · minimum lot area per family: >= 6000 square feet · minimum lot width: >= 60 feet

  “R-1(8) Single-family 2½ 35 25 5 30 6,000 60 6,000”

• SetbacksSpecified

  R-1 Single-family District inside the City of Mexico, Missouri.

  minimum front yard depth: >= 25 feet · minimum side yard width: >= 5 feet · minimum rear yard depth: >= 30 feet

  “R-1(8) Single-family 2½ 35 25 5 30 6,000 60 6,000”

• Building heightSpecified

  R-1 Single-family District inside the City of Mexico, Missouri.

  maximum building height: <= 35 feet · maximum stories: <= 2½ stories

  “R-1(8) Single-family 2½ 35 25 5 30 6,000 60 6,000”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Mexico or Audrain County directly.

• Owner-builder exemption — Owner-built residential construction inside the City of Mexico, Missouri.
• Inspections — Building inspections for construction inside the City of Mexico, Missouri.
• Certificate of occupancy — Certificates of occupancy for land and buildings inside the City of Mexico, Missouri.
• Lot coverage — Lot coverage inside the City of Mexico, Missouri.
• Tiny homes — Tiny-home occupancy inside the City of Mexico, Missouri.

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.