Zoning, building permits and septic rules in St. Ansgar, Iowa

St. Ansgar’s own rules

• Building permitRequired

  Restructuring a house, fence or deck, and accessory buildings over 120 square feet, inside St. Ansgar city limits. Zoning permits are also required for new buildings and occupancy under section 17.2.

  • Per city FAQ, a permit is needed for restructuring a house, fence or deck and for accessory buildings over 120 square feet.
  • Under section 17.2, no building or structure may be occupied or used until a zoning permit is issued by the zoning administrative officer.
  • Allow at least 24 hours for building permit applications (city FAQ).
  • Scope of the zoning permit for new single-family construction is shown by section 17.2; the building code adopted by the city was not located.

  minimum accessory building size before permit: > 120 square feet (accessory buildings over 120 square feet need a permit)

  “any restructuring of your house, fence or deck, requires a permit. accessory buildings over 120 square feet also need a permit.”

• Certificate of occupancyRequired

  Occupancy or use of a building or structure inside St. Ansgar city limits.

  • The ordinance calls this a zoning permit, not a certificate of occupancy; it is the occupancy approval that section 17.2 requires before a building is occupied or used.
  • Section 17.8 (inspections) was not read; the relationship between inspections and the occupancy permit is unconfirmed.

  “no building or structure, including temporary buildings and structures, hereafter erected or structurally altered shall be occupied or used in whole or in part for any purpose whatsoever, until a permit is issued by the zoning administrative officer, stating that the building and use comply with the provisions of this ordinance and the city's building and health ordinances.”

• Local zoningPresent (with conditions)

  Land inside the corporate limits of St. Ansgar city, Iowa. The city's own zoning ordinance governs the zoning of all lands within those limits.

  • Section 1.2 says the ordinance is adopted under chapter 414 of the Code of Iowa and governs all lands within the corporate limits of the city.
  • The posted PDF is an unsigned copy: the adoption line reads 'passed and adopted this _____ day of _______________________, 2025', the ordinance number is blank, and it says it repeals former chapter 165 'Zoning Regulations' and ordinance 318. Confirm with City Hall (641-713-4921) which version is in force and its effective date.
  • Special exceptions in the agricultural and residential districts need board of adjustment approval under the ordinance's special exception provisions.

  “in accordance with the provisions of chapter 414 of the code of iowa and amendatory acts thereto, this ordinance is adopted by the city of st. ansgar, iowa, governing the zoning of all lands within the corporate limits of the city.”

• Zoning districtsPublished

  Land inside St. Ansgar city limits. The ordinance divides the city into zoning districts, including the agricultural (AG, art. 4), residential low-density (R-LD, art. 5), residential high-density (R-HD, art. 6), mobile home (MH, art. 7) and heavy industrial (HI, art. 10) districts, plus others in articles 8-9.

  • Districts and the official zoning map are part of the ordinance; the posted copy is the unsigned version described in the local zoning claim.

  “the intent of the residential low-density (r-ld) district is to provide for low to medium density residential development with a limited number of institutional and recreational facilities permitted.”

• Minimum lot sizeSpecified

  Agricultural (AG) district under article 4, inside St. Ansgar city limits.

  • Standards apply subject to modifications in article 11.
  • The section 4.5 table in the posted PDF lists these numbers for the AG district.

  minimum lot area: >= 6000 square feet · minimum lot width: >= 50 feet

  “4.5 bulk requirements the following minimum requirements shall be observed subject to modifications contained in article 11. minimum lot area minimum lot width minimum front yard minimum side yard minimum rear yard 6,000 square feet 50 feet 25 feet 6 feet 25 feet”

  One more reviewed finding on this topic

  • Specified — Main single-family residential district R-LD (residential low-density), inside St. Ansgar city limits.

    “5.5 bulk requirements the following minimum requirements shall be observed subject to modifications contained in article 11. minimum lot area minimum lot width minimum front yard minimum side yard minimum rear yard 6,000 square feet 50 feet 25 feet 6 feet 25 feet”

• SetbacksSpecified

  Main single-family residential district R-LD, inside St. Ansgar city limits.

  • An attached porch, covered or not, is treated as part of the principal building for setback measurement.
  • Accessory building setbacks (section 11.9) and yard rules (section 11.6) were not read; they may add limits.

  minimum front yard: >= 25 feet · minimum side yard: >= 6 feet · minimum rear yard: >= 25 feet

  “5.5 bulk requirements the following minimum requirements shall be observed subject to modifications contained in article 11. minimum lot area minimum lot width minimum front yard minimum side yard minimum rear yard 6,000 square feet 50 feet 25 feet 6 feet 25 feet”

  One more reviewed finding on this topic

  • Specified — Agricultural (AG) district under article 4, inside St. Ansgar city limits.

    “4.5 bulk requirements the following minimum requirements shall be observed subject to modifications contained in article 11. minimum lot area minimum lot width minimum front yard minimum side yard minimum rear yard 6,000 square feet 50 feet 25 feet 6 feet 25 feet”

• Building heightSpecified

  Agricultural (AG) district under article 4, inside St. Ansgar city limits.

  • Height exceptions in section 11.7 were not read.

  maximum height: <= 40 feet (lesser of 2½ stories or 40 feet) · maximum stories: <= 2.5 stories (lesser of 2½ stories or 40 feet)

  “maximum height (lesser of) 2½ stories or 40 feet”

  One more reviewed finding on this topic

  • Specified — Main single-family residential district R-LD, inside St. Ansgar city limits.

    “maximum height (lesser of) 2½ stories or 40 feet”

• Living in an RVTemporary only (with conditions)

  Recreational vehicles used as living quarters on private land inside St. Ansgar city limits.

  • A recreational vehicle may not be used as a permanent dwelling or living quarters.
  • Temporary living quarters are allowed up to two weeks per year on a lot.
  • Section 13.4 allows an RV parked in a residential front yard for a two-week period if on an improved surface leading to a garage or designated parking area.
  • Section 7 (mobile home district) also allows a guest's RV for temporary lodging up to 14 days per calendar quarter with a temporary use permit; this applies to the MH district text and was not confirmed beyond that section.

  temporary living quarters: <= 2 weeks (per year on a lot)

  “no recreational vehicle shall be used as a permanent dwelling or living quarters. however, a recreational vehicle may be used as temporary living quarters up to a maximum of two (2) weeks per year on a lot or as a temporary construction building as allowed above.”

• Camping on your landLimited

  Temporary camping or living in recreational vehicles and tents on private land inside St. Ansgar city limits.

  • Temporary living quarters in an RV are limited to two weeks per year on a lot.
  • Tent camping, campgrounds and trailer camps are not addressed in the sections read; the campground and trailer camp definitions are in article 2 only.
  • Temporary construction buildings may be allowed during active construction and must be removed within 30 days after completion or abandonment.

  temporary RV living quarters: <= 2 weeks (per year on a lot)

  “no recreational vehicle shall be used as a permanent dwelling or living quarters. however, a recreational vehicle may be used as temporary living quarters up to a maximum of two (2) weeks per year on a lot or as a temporary construction building as allowed above.”

• Manufactured homesLimited

  Factory-built and mobile homes occupied on land inside St. Ansgar city limits.

  • Factory-built/mobile homes must be in a mobile home park to be occupied, temporarily or permanently, as stated in section 11.13(3); emergency-use exception text was not read in full.
  • Mobile home parks must be located in the mobile home (MH) district and meet article 7 requirements (5-acre minimum park lot, individual lot 4,000 sq ft per home).
  • Piers are permitted for modular and manufactured homes under state statute (section 11.10(1)).

  “a factorybuilt/mobile home shall not be occupied, whether temporarily or permanently, unless it is parked or stored in a mobile home park, as authorized under this ordinance.”

• Accessory dwellingsLimited

  Accessory dwelling units in the R-LD district, inside St. Ansgar city limits.

  • Maximum one ADU per lot.
  • Allowed only when a single-family home is constructed on the lot.
  • Residential space of an ADU may not exceed 1,500 square feet or 50% of the principal dwelling area, whichever is greater (section 11.11 as quoted).
  • Attached ADUs follow principal building setbacks; detached ADUs follow the accessory building rules in section 11.11(3), which were not read in full.

  maximum ADUs per lot: 1 count · maximum ADU residential area: <= 1500 square feet (or 50% of principal dwelling area, whichever is greater)

  “6. accessory dwelling units, maximum one (1) per lot, provided that a single-family home is constructed on the lot.”

  One more reviewed finding on this topic

  • Limited — Accessory dwelling units in the agricultural (AG) district, inside St. Ansgar city limits.

    “6. accessory dwelling units, maximum one (1) per lot.”

• Permit processPartial

  Building and zoning permit process inside St. Ansgar city limits.

  • Permits are issued by the zoning administrative officer (section 17.1-17.2); the application procedure in section 17.4 was not read.
  • Allow a minimum of 24 hours for building permit applications (city FAQ).
  • City Hall contact: 641-713-4921; [email protected].

  “please allow a minimum of 24 hours when applying for a building permit.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask St. Ansgar or Mitchell County directly.

• Owner-builder exemption — Owner-builder exemption inside St. Ansgar city limits
• Building code adopted — Building code adoption inside St. Ansgar city limits
• Inspections — Building inspections inside St. Ansgar city limits
• Minimum dwelling size — Minimum dwelling size inside St. Ansgar city limits
• Lot coverage — Maximum lot coverage inside St. Ansgar city limits

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.