Bolthole Index

Johnson County, Indiana

Zoning, building permits and septic rules in Trafalgar, Indiana

The Town of Trafalgar, Indiana, in Johnson County, has its own zoning ordinance with mapped districts1. A building permit is required before starting work on any building or structure that costs more than $5002. Septic permits for homes not on town sewer come from the Johnson County Health Department, not the town3.

At a glance

Zoning
Yes: town zoning ordinance with mapped districts1
Building permit
Required when construction cost exceeds $5002
Septic
Local health department permit where no sanitary sewer connection43
Sewer and water
Connection mandatory in R-1 and A districts as public service becomes available56
Minimum home size
1,000 sq ft in R-1 and A districts78
Minimum lot (A district)
2 acres, 200 ft wide9
Mobile homes
Special exception only, in A district, for farmers10

Who to call

Building permits

Town of Trafalgar Planning and Zoning (building permits)

Residential and commercial building permits, zoning map and variance requests inside Trafalgar

317-878-4592

2770 W St. Rd. 252, Trafalgar, IN

Septic permits

Johnson County Health Department, Environmental Health (Onsite Septic)

Onsite septic permits, installation, repair and abandonment approvals for Johnson County

(317) 346-4365

95 S Drake Rd, Franklin, IN 46131

Contact details are copied from each office’s official page and were checked against it on October 23, 2026.

Off-grid gear

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

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Does Trafalgar, Indiana have zoning, and what does it mean for lot size, setbacks and homes?

Yes. Trafalgar's Chapter 152 states that land in the town is classified and zoned into districts shown on the zoning maps1. The code lists residential districts R-1 through R-4, agricultural districts A and AC, and industrial, commercial and mixed-use districts; the official zone map is on file with the building commissioner11. Rules differ by district, so find your parcel's district first.

In R-1 Residential, the minimum lot is 6,500 square feet and 60 feet wide12, the minimum primary building is 1,000 square feet excluding garage, carports and porches7, and height tops out at 35 feet13.

In the A Agricultural District, lots must be 200 feet wide and at least 2 acres, or larger if the county health department requires more for a septic drain field9. The main floor must be at least 1,000 square feet, or 900 square feet for two-story homes8. Front setbacks run from 25 to 50 feet depending on road class, with 20 feet at the rear and 10 feet at the sides14. Maximum height is 50 feet15. Those minimum floor areas rule out most tiny homes in these two districts; we could not confirm a tiny-home or RV-occupancy rule, so ask the town planning and zoning office16.

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

Yes. Inside Trafalgar, a permit is required before beginning construction, alteration or repair of any building or structure whose construction cost exceeds $5002. The application needs a plat or sketch showing lot boundaries plus plans and specifications, and fees are payable to the town2. The town's Planning and Zoning page offers separate residential and commercial building permit forms and a variance request packet16.

The town, not Johnson County, handles building permits inside town limits. The county's building department serves only unincorporated Johnson County, so a Trafalgar address is sent to the town office first16. We could not confirm which building code the town adopts, how inspections or certificates of occupancy work, or the fee schedule; ask the town office before you design.

How do septic permits work in Trafalgar?

Indiana requires a written construction permit signed by the health officer for any residence not connected to a sanitary sewer4. The rule is administered by local boards of health, so the Johnson County Health Department issues these permits, not the town317. The local health department must issue or deny a complete application within 30 days4.

In Trafalgar's R-1 and A districts, attachment to public water and sanitary sewer is mandatory for development as those facilities become available56. Where they are not available in the A district, the town's septic and well standards apply6. Ask the town whether sewer reaches your lot before you pay for a soil evaluation. Statewide, drywells and cesspools are not allowed18.

Can you put a mobile home, accessory apartment or RV on a lot in Trafalgar?

Mobile homes are a special exception, not a permitted use, in Trafalgar's A Agricultural District, and only for mobile homes required by farmers10. Accessory apartments are also a special exception in the A district19. Both go through the Board of Zoning Appeals. We could not confirm any rule on living in an RV or on temporary camping inside the town; ask the town Planning and Zoning office before parking one on a lot. Indiana's campground rule does not cover individually deeded lots, so it does not answer the question20.

Building a home in Trafalgar: the steps, in order

  1. Confirm your parcel's zoning district with the town Planning and Zoning office16.
  2. Ask whether public sewer and water reach the lot; if not, call the Johnson County Health Department about a septic permit17.
  3. Check lot size and setbacks for your district, for example 2 acres and 200 feet of width in the A district9.
  4. Apply for the town building permit with a plat or sketch and plans; permits are required above $500 in construction cost2.
  5. If the project needs a state construction design release, the state review takes 10 business days for an initial determination21.
  6. A driveway onto a state highway needs an INDOT permit22.

What stays with Johnson County, and what to check before you buy in Trafalgar

Land outside the town limits falls under the county. For unincorporated Johnson County, see the Johnson County page. Septic and wells stay with the county health department; Indiana says several local health departments require a well permit, so ask Johnson County whether yours does23. Floodway construction needs prior DNR approval on streams draining more than 1 square mile24.

Countywide, only about 1% of soils are rated not limited for a conventional septic drain field25. That is a strict rating, so expect a site evaluation and possibly an engineered system. Johnson County's median property tax bill is $1,875 a year26.

Watch-outs

  • We could not confirm Trafalgar's building code, inspection steps, certificate of occupancy rules, fee schedule or floodplain rules; call the town Planning and Zoning office at the number listed before you commit16.
  • Mobile homes and accessory apartments are special exceptions in the A district and need Board of Zoning Appeals approval1019.
  • Subdivision is strictly prohibited in the Agricultural Conservation (AC) district, so check whether a parcel is AC before planning a split27.

Sources

  1. Trafalgar, Indiana Code of Ordinances - Chapter 152: Zoning (definitions, general provisions) (Town of Trafalgar), quoted and re-checked
  2. Trafalgar, Indiana Code of Ordinances - Chapter 150 Revised Building Code, §§ 150.35-150.37 (Town of Trafalgar), quoted and re-checked
  3. Residential On-Site Sewage Systems, administrative authority, quoted and re-checked
  4. Residential On-Site Sewage Systems, 410 IAC 6-8.3, quoted and re-checked
  5. Trafalgar, Indiana Code of Ordinances - §§ 152.035-152.038 residential zoning districts and R-1/R-2 regulations (Town of Trafalgar), quoted and re-checked
  6. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  7. Trafalgar, Indiana Code of Ordinances - §§ 152.035-152.038 residential zoning districts and R-1/R-2 regulations (Town of Trafalgar), quoted and re-checked
  8. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  9. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  10. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  11. Trafalgar, Indiana Code of Ordinances - Chapter 152: Zoning (definitions, general provisions) (Town of Trafalgar), quoted and re-checked
  12. Trafalgar, Indiana Code of Ordinances - §§ 152.035-152.038 residential zoning districts and R-1/R-2 regulations (Town of Trafalgar), quoted and re-checked
  13. Trafalgar, Indiana Code of Ordinances - §§ 152.035-152.038 residential zoning districts and R-1/R-2 regulations (Town of Trafalgar), quoted and re-checked
  14. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  15. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  16. Town of Trafalgar Planning and Zoning (building permits) (townoftrafalgar.org)
  17. Johnson County Health Department, Environmental Health (Onsite Septic) (johnsoncounty.in.gov)
  18. 410 IAC 6-8.3 Residential On-Site Sewage Systems (Indiana statewide rule), quoted and re-checked
  19. Trafalgar, Indiana Code of Ordinances - §§ 152.070-152.071 A Agricultural District and AC Agricultural Conservation District (Town of Trafalgar), quoted and re-checked
  20. Environmental Public Health: 410 IAC 6-71 Campgrounds (Indiana statewide rule), quoted and re-checked
  21. Building Plan Review (Indiana statewide rule), quoted and re-checked
  22. INDOT Driveway Permit Guide 2024 (Indiana statewide rule), quoted and re-checked
  23. Recommended Standards For Private Water Wells (Indiana statewide rule), quoted and re-checked
  24. Water: Permit Application Type, quoted and re-checked
  25. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  26. Median property tax bill: Bolthole Index county data
  27. Trafalgar, Indiana Code of Ordinances - §§ 152.041-152.042 accessory uses and residential special regulations (Town of Trafalgar), quoted and re-checked

Written October 23, 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 Town of Trafalgar

Town of Trafalgar’s own rules

  • Building permitRequired

    Construction, alteration or repair of buildings or structures inside Trafalgar town where construction cost exceeds $500

    • Permit required only where the construction cost exceeds $500.
    • Application must be accompanied by a plat or sketch showing lot boundaries and plans and specifications (§ 150.35).
    • A copy of a state design release issued under i.c. 22-15-3-1 must be given to the building commissioner before a permit issues for covered construction.
    • All fees required by the code are payable to the town; the town fee schedule is referenced in Title III, chapter 36 (§ 150.01).

    construction cost threshold for permit: > 500 USD

    “a permit shall be obtained before beginning construction, alteration or repair of any building or structure, the construction cost of which exceeds $500”
  • Local zoningPresent (with conditions)

    Land inside Trafalgar town limits, which Chapter 152 of the town code states is classified and zoned into districts

    • Zoning text states that land within the town, including its incorporated and unincorporated portions, is classified and zoned into districts shown on the zoning maps.
    • Permitted uses and dimensional limits depend on the district; the zoning map itself was not captured in the text reviewed.
    • Zoning ordinance was passed in 1991 and amended later; no effective date is stated on the captured pages.
    “the zoning ordinance consists of two parts: a text and a map.”
  • Zoning districtsPublished (with conditions)

    Zoning district classifications and zone map for land inside Trafalgar town

    • Chapter 152 lists residential districts R-1 through R-4, agricultural A and AC, industrial, commercial and mixed-use districts; only R-1, R-2, A and AC were read.
    • The official zone map is on file with the building commissioner; the map itself was not captured.
    “the zoning ordinance consists of two parts: a text and a map.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Single-family dwellings in the R-1 Residential District inside Trafalgar town

    • Area excludes garage, carports and open porches.
    • Multi-story structures also require a minimum main floor area of 750 square feet.
    • Minimum width of a single-family residence is 14 feet.

    minimum floor area of primary building: >= 1000 square feet (multi-story structures also require 750 square feet minimum main floor area)

    “minimum floor area of the primary building exclusive of garage, carports and open porches shall be 1,000 square feet. multi-story structures shall also require a minimum main floor area of 750 square feet.”
    One more reviewed finding on this topic
  • Minimum lot sizeDistrict specific (with conditions)

    Lots in the A Agricultural District inside Trafalgar town

    • Lot must be at least the acreage the county health department determines is needed for a septic drain field, if larger than two acres.
    • Minimum lot width is 200 feet.

    minimum lot area: >= 2 acres (or the minimum acreage needed as determined by the county health department for a septic drain field) · minimum lot width: >= 200 feet

    “(b) minimum lot width. minimum lot width: 200 feet.”
    One more reviewed finding on this topic
  • SetbacksDistrict specific (with conditions)

    Principal buildings on lots in the A Agricultural District inside Trafalgar town

    • Front setback depends on the road class of the street frontage as listed in the A-district table.

    minimum front yard, major arterial: >= 50 feet (front yard depends on road class) · minimum front yard, minor arterial: >= 45 feet · minimum front yard, major collector: >= 40 feet · minimum front yard, minor collector: >= 35 feet · minimum front yard, local access: >= 35 feet · minimum front yard, cul-de-sac: >= 25 feet · minimum rear yard: >= 20 feet · minimum side yard: >= 10 feet

    “1. setback line and minimum front yard: district major arterial minor arterial major collector minor collector local access cul-de-sac a 50 45 40 35 35 25 2. minimum rear yard: 20 feet. 3. minimum side yard: ten feet.”
  • Building heightDistrict specific (with conditions)

    Principal buildings in the A Agricultural District inside Trafalgar town

    maximum building height: <= 50 feet

    “(e) maximum height. maximum height shall be 50 feet.”
    One more reviewed finding on this topic
  • Manufactured homesLimited

    Mobile homes in the A Agricultural District inside Trafalgar town

    • Listed as a special exception, not a permitted use, and only for mobile homes required by farmers.
    • Special exception is granted under the board of zoning appeals process; the A-district standards in § 152.070 also apply.
    “(2) special exceptions. (a) accessory apartments; (b) child care homes; (c) child care centers; (d) bed and breakfast homes; (e) public or private utility structures; (f) public swimming pools; (g) nursing homes; (h) mobile homes required by farmers; (i) private clubs;”
  • Accessory dwellingsLimited

    Accessory apartments in the A Agricultural District inside Trafalgar town

    • Listed as a special exception, not a permitted use.
    • Requires the special exception approval process; the approval standards in §§ 152.020-152.021 were not captured.
    “(2) special exceptions. (a) accessory apartments;”
  • Mandatory utility hookupWater and sewer (with conditions)

    New development in the A Agricultural District inside Trafalgar town

    • Connection is mandatory only as public water and sanitary sewer facilities become available; no distance threshold is stated in the captured text.
    • Where facilities are not available, the A-district septic and well requirements in § 152.070 apply; the septic and well permit process was not captured.
    “(k) utilities. further, attachment to public water and sanitary sewer facilities shall be mandatory for development in this district as these facilities become available.”
    One more reviewed finding on this topic
  • Subdividing landRegulated (with conditions)

    Subdivision of land inside Trafalgar town

    • Subdivision is regulated under the town subdivision control ordinance (Chapter 153), which was not opened.
    • Subdivision of property is strictly prohibited in the AC Agricultural Conservation overlay.
    • Original lots in the A district may be split by minor subdivision if the resulting parcels average no denser than one lot per ten acres.

    A district minor subdivision average lot density limit: one lot per ten acres

    “(4) subdivision of property prohibited. the subdivision of property (as defined in the town subdivision control ordinance) is strictly prohibited in the agricultural conservation district.”

Still unanswered

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

  • Owner-builder exemption — Owner-builder permit exemption inside Trafalgar town
  • Building code adopted — Building code adoption inside Trafalgar town
  • Inspections — Building inspections inside Trafalgar town
  • Certificate of occupancy — Certificate of occupancy for new buildings inside Trafalgar town
  • Living in an RV — Occupancy of recreational vehicles on private land inside Trafalgar town
11 more unanswered
  • Camping on your land
  • Tiny homes
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals
  • Permit fees

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 Town of Trafalgar publishes no rule on the point, not that none exists. Johnson County’s page lists the county offices to call.

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