Bolthole Index

Jones County, Iowa

Zoning, building permits and septic rules in Monticello, Iowa

Inside Monticello, Iowa, zoning comes from the city's own Chapter 165 zoning regulations, not from Jones County1. We could not confirm how building permits work inside city limits, so ask Monticello City Hall before you design anything. Septic permits and private wells are handled by Jones County Environmental Health23.

At a glance

Zoning
Yes: the city's own Chapter 165 zoning regulations apply inside city limits1
Building permit
Not confirmed for inside the city; Iowa leaves permits to each local government4
Septic
Jones County rules require a septic permit countywide; the city's own on-site wastewater chapter was not confirmed5
Manufactured homes
Allowed in residential districts if installed to site-built standards6
Accessory dwelling
One allowed with a single-family home in the R-1 district, with size limits7
Minimum lot, R-1 single-family
7,000 sq ft and 70 feet wide8
Minimum lot, A-1 single-family
1 acre and 150 feet wide9
Property tax (Jones County)
1.3% effective rate10

Who to call

Septic permits

Jones County Environmental Health

Septic and private-well applications and inspections for Jones County

319-462-4715

environmental@jonescountyiowa.gov

Jones County Annex, 105 Broadway Place, Suite 11, Anamosa, IA 52205

Zoning

Jones County Land Use

Zoning, land-use and subdivision questions for rural Jones County, outside any city's limits

319-462-2282

landuse@jonescountyiowa.gov

Jones County Courthouse, 500 W. Main St., Room 113, Anamosa, IA 52205

Contact details are copied from each office’s official page and were checked against it on October 24, 2026.

Off-grid gear

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

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Does Monticello, Iowa have zoning, and what does it mean for homes and lot size?

Monticello has its own zoning: Chapter 165 of the city code governs land inside city limits, and it is a city chapter, not a county ordinance1. The districts are A-1 Agricultural, R-1 Single-Family, R-2 Two-Family, R-3 Multiple-Family, R-4 Manufactured Home Park, three commercial districts and an M-1 industrial district11.

Lot size depends on the district. A single-family lot in R-1 needs at least 7,000 square feet and 70 feet of width8. In A-1, a single-family lot needs at least 1 acre and 150 feet of width9. Principal buildings in R-1 are capped at 45 feet or 3 stories12, and the same cap applies in A-113. A single-family home in A-1 also has a minimum floor area of 910 square feet for one story and 1,220 square feet for two stories14. We could not confirm a lot-coverage limit; ask the city.

Manufactured and modular homes in a residential district must be installed to the same standards as a site-built home, including a permanent foundation, and must be taxed as site-built6. An R-1 lot with a single-family home may add one accessory dwelling of up to 1,000 square feet or fifty percent of the main residence, whichever is larger7.

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

We could not confirm Monticello's building-permit rules, inspection requirements or certificate-of-occupancy process, so call Monticello City Hall before you break ground. Iowa leaves the issuing of building permits and inspections to each city and county, to be administered under local ordinance4. The state building code applies in a local jurisdiction only after its governing body accepts it by ordinance15.

The state's contractor-registration exemption for people working on their own property does not waive building permits, code compliance or inspections16. Jones County's rural building rules do not reach inside the city: the county zoning ordinance applies only to land outside the corporate limits of any city17.

How do septic permits and wells work for a Monticello address?

Jones County Environmental Health runs the county's septic rules, and the Administrative Authority is the county Environmental Sanitarian or an agent of the Jones County Board of Health23. The county requires an approved permit application before any septic work starts5. No private septic permit is issued when the property is within 200 feet of a public sewer5, so a lot on a Monticello sewer line normally connects to the city system instead.

We could not confirm what the city's own on-site wastewater chapter requires, so ask both Monticello City Hall and Jones County Environmental Health which office signs off on your lot. Septic systems serving homes with up to four dwelling units are inspected before a sale closes anywhere in Iowa18. Private wells need a state-required permit; Jones County's application lists a $250 non-refundable fee19.

Can you live in an RV or tiny home in Monticello?

We could not confirm whether Monticello allows living in an RV, camping on a lot or occupying a tiny home inside city limits, so ask City Hall before you buy. The Jones County rule that treats a travel trailer as a temporary dwelling, not used for permanent habitation, applies to unincorporated land only20. For a permanent small home inside the city, the confirmed paths are a manufactured or modular home on a permanent foundation6 or an accessory dwelling in R-17.

Building a home in Monticello: the steps, in order

Start with zoning, then confirm permits and utilities, then septic or sewer.

  1. Find the lot's zoning district on the city's zoning map and check it against Chapter 16511.
  2. Ask Monticello City Hall which building permits, inspections and certificates of occupancy apply, since we could not confirm them4.
  3. Ask whether the lot must connect to city sewer; Jones County will not issue a private septic permit within 200 feet of a public sewer5.
  4. If the lot is outside any sewer reach, apply to Jones County Environmental Health for a septic permit and a well permit519.
  5. If you are dividing land, the city has subdivision regulations in Chapter 170, whose requirements we could not confirm21.

What stays with Jones County, and what to check before you buy in Monticello

Septic permits, well permits and the county health rules come from Jones County, not the city219. For land outside Monticello city limits, the county's own rules are on the Jones County page, and Jones County Land Use handles rural zoning there22.

Before you buy, confirm the zoning district, sewer availability and any floodplain status with the city. Jones County's effective property tax rate is 1.3%10, and the median property tax bill is $2,381 a year23.

Watch-outs

  • Monticello's building-permit, inspection and certificate-of-occupancy rules were not confirmed, so ask City Hall before you pay for plans4.
  • Jones County's zoning ordinance covers only land outside city limits, so county rules and fees do not apply to a lot inside Monticello17.
  • Septic oversight and well permits for a Monticello address come from Jones County Environmental Health, and the city's own on-site wastewater rules were not confirmed23.

Sources

  1. Monticello, IA Code of Ordinances - page showing code table of contents and sections 177.03-177.05 (Monticello), quoted and re-checked
  2. The Private and Public Sewage Disposal Systems Rules, quoted and re-checked
  3. Jones County Environmental Health (jonescountyiowa.gov)
  4. Iowa Code 2026, Chapter 103A — State Building Code (Iowa statewide rule), quoted and re-checked
  5. The Private and Public Sewage Disposal Systems Rules, quoted and re-checked
  6. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  7. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  8. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  9. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  10. Effective property tax rate: Bolthole Index county data
  11. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  12. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  13. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  14. Monticello, IA Code of Ordinances - Chapter 165 Zoning Regulations, sections 165.29-165.31 (bulk requirements; A-1 and R-1 districts) (Monticello), quoted and re-checked
  15. Building Code Plan Review (Iowa statewide rule), quoted and re-checked
  16. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  17. Land Use in Jones County, Iowa, quoted and re-checked
  18. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  19. Private Water Well Construction Permit Rules, quoted and re-checked
  20. Jones County Zoning Ordinance, quoted and re-checked
  21. Monticello, IA Code of Ordinances - page showing code table of contents and sections 177.03-177.05 (Monticello), quoted and re-checked
  22. Jones County Land Use (jonescountyiowa.gov)
  23. Median property tax bill: Bolthole Index county data

Written October 24, 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 Monticello

Monticello’s own rules

  • Local zoningPresent (with conditions)

    Land inside Monticello city limits (Monticello city, Iowa, Jones County). Monticello city's own Chapter 165 Zoning Regulations applies there.

    • Chapter 165 is a city code chapter, not a county ordinance; it does not govern the unincorporated area.
    • Permitted uses and dimensional limits depend on the district section (A-1, R-1, R-2 and so on) and on the conditions in that section.
    “chapter 160 floodplain management chapter 165 zoning regulations chapter 170 subdivision regulations”
  • Zoning districtsPublished (with conditions)

    Zoning districts of Monticello city, Iowa (inside city limits only)

    • Districts listed in the Chapter 165 table of contents: A-1 Agricultural (165.30), R-1 Single-Family (165.31), R-2 Two-Family (165.32), R-3 Multiple-Family and Condominium (165.33), R-4 Manufactured Home Park (165.34), C-1 General Commercial (165.35), C-2 Central Commercial (165.36), C-3 Highway Commercial (165.37), M-1 Light and Heavy Industrial (165.38).
    • Sections 165.39 and 165.40 are listed as reserved for future use.
    • The district map is in section 165.16 (official zoning map); its content was not opened.
    “165.30 district a-1 agricultural district. 165.31 district r-1 single-family residential district. 165.32 district r-2 two-family residential district.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Single-family dwellings in the A-1 agricultural district, Monticello city, Iowa

    • Table 1 floor-area cell for the A-1 single family row reads '1 story, 910 sf 2 story, 1,220 sf 3 story, 1,100 sf'.
    • The A-1 row has '--' in the coverage column in the captured table, so floor-area alignment should be confirmed against the printed table.

    minimum floor area, one story: >= 910 sq ft · minimum floor area, two story: >= 1220 sq ft · minimum floor area, three story: >= 1100 sq ft

    “a-1 single family 45 feet or 3 stories 1 acre 150 feet 30 feet 10 feet 30 feet 35 feet -- 1 story, 910 sf 2 story, 1,220 sf 3 story, 1,100 sf”
  • Minimum lot sizeDistrict specific (with conditions)

    Single-family dwellings in the A-1 agricultural district, Monticello city, Iowa

    • Table 1 'a-1 other permitted uses' row lists 3 acres and 180 feet; that row does not apply to single-family dwellings.

    minimum lot area: >= 1 acre · minimum lot width: >= 150 feet

    “a-1 single family 45 feet or 3 stories 1 acre 150 feet 30 feet 10 feet 30 feet 35 feet --”
    One more reviewed finding on this topic
  • Building heightDistrict specific (with conditions)

    Principal buildings in the A-1 agricultural district, Monticello city, Iowa

    • Accessory building height limits are in section 165.13 (not opened).

    maximum building height: <= 45 feet (or 3 stories, per Table 1) · maximum building height: <= 3 stories (or 45 feet, per Table 1)

    “a-1 single family 45 feet or 3 stories 1 acre 150 feet”
    One more reviewed finding on this topic
  • Manufactured homesLimited

    Manufactured or modular homes placed in a residential zoning district inside Monticello city limits (stated in the R-1 section, 165.31)

    • Must be installed to the same standards as a site-built home, including a permanent foundation system, setbacks and minimum square footage that would apply to a site-built single-family dwelling on the same lot.
    • Must be assessed and taxed as a site-built dwelling.
    • Chapter 146 Manufactured and Mobile Homes is listed in the table of contents but was not opened; mobile home park rules in the R-4 district (165.34) were not checked.
    “any manufactured or modular homes that are placed in a residential zoning district will be required to be installed to the same standards of a site-built home, including, but not limited to, a permanent foundation system, set-back, and minimum square footage which would apply to a site-built, single-family dwelling on the same lot, and shall require that the home is assessed and taxed as a site-built dwelling.”
  • Accessory dwellingsLimited

    One accessory dwelling unit on a lot with one single-family residence in the R-1 single-family district, Monticello city, Iowa

    • (1) no accessory dwelling unit shall exceed 1,000 square feet in area or fifty percent of the size of the single-family residence, whichever is larger;
    • (2) an accessory dwelling unit shall comply with all applicable building, setback, height and area regulations for the structure within which it is contained;
    • (3) the accessory dwelling unit shall not be required to have separate utility lines between the accessory dwelling unit and public utility service connections, unless full utility access that includes a separate metering system for billing purposes cannot be provide (captured text is cut off here; the rest of (3) and later subsections were not captured).

    accessory dwelling unit maximum area: <= 1000 sq ft (or fifty percent of the size of the single-family residence, whichever is larger)

    “c. one single family residence; along with no more than one (1) accessory dwelling unit in accordance with the following requirements: (1) no accessory dwelling unit shall exceed 1,000 square feet in area or fifty percent of the size of the single-family residence, whichever is larger;”
  • Subdividing landRegulated (with conditions)

    Division of land inside Monticello city limits

    • Only the existence of Chapter 170 Subdivision Regulations is verified; its platting, approval and improvement requirements were not opened.
    “chapter 160 floodplain management chapter 165 zoning regulations chapter 170 subdivision regulations”

Still unanswered

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

  • Owner-builder exemption — Owner-builder permit exemption inside Monticello city limits
  • Building code adopted — Building code adoption for Monticello city, Iowa
  • Inspections — Building inspections for construction inside Monticello city limits
  • Certificate of occupancy — Certificate of occupancy for new dwellings inside Monticello city limits
  • Lot coverage — Maximum lot coverage for single-family lots inside Monticello city limits
15 more unanswered
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees
  • Permit process

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 Monticello publishes no rule on the point, not that none exists. Jones County’s page lists the county offices to call.

← All of Jones County: county rules, score and offices