Zoning, building permits and septic rules in Delphi, Indiana

Delphi’s own rules

• Local zoningPresent (with conditions)

  Land inside Delphi city limits: the city's Unified Development Ordinance (UDO), which combines zoning and subdivision control, is administered by the city Plan Commission and Board of Zoning Appeals.

  • The city page lists 'delphi udo adoption (updated 2026)' and Ordinance 2024-01 Unified Development Ordinance; the UDO text read here is the PC hearing draft in the city document library, not the adopted or 2026 file.
  • Its page footers are dated 2024-02-06; a 2025 amendment (chickens in low-density residential districts) appeared in search results only and was not opened.
  • Carroll County zoning (1971) and county comprehensive plan may still be cited for areas outside the city; they do not govern land inside city limits where the city UDO applies.

  “the delphi plan commission and board of zoning appeals have jurisdiction within the corporate limits of the city of delphi.”

• Zoning districtsPublished

  Land use districts inside Delphi city limits

  • Districts include low-density residential (R1), medium-density residential (R2), high-density residential (R3), general business (GB), institutional (IN), light industrial (I1), heavy industrial (I2), plus a floodway overlay (FPO) and Hoosier Heartland overlay (HHO).
  • The HHO requires 3 acres minimum lot area, per the PC draft.
  • Districts and overlays are shown in the PC draft; the official zoning map is not a city web text.

  “c. use and development standards. permitted uses - low-density residential district (r1) accessory uses”

• Living in an RVProhibited

  Long-term residential occupancy of a recreational vehicle on private land inside Delphi city limits

  • Occupancy over 14 consecutive days is barred unless the RV is in an ISDH-regulated campground or RV park.
  • The ban covers residential occupancy, not storage.

  maximum consecutive days outside regulated campground: <= 14 days (except in an ISDH-regulated campground or RV park)

  “recreational vehicles are not permitted to be used for long-term residential occupancy (more than fourteen (14) consecutive days unless they are located within an indiana state department of health (isdh) regulated campground or rv park.”

  2 more reviewed findings on this topic

  • Limited — Recreational use of an RV on private land inside Delphi city limits, outside a regulated campground

    “the rv is occupied for recreational purposes only (no long-term or permanent occupancy) and shall not exceed fourteen (14) consecutive days;”

  • Temporary only (with conditions) — An RV occupied by the owner during construction or remodeling of a single-family dwelling on the same parcel inside Delphi city limits

    “temporary occupancy of the rv is limited to one (1) year and may be renewed once for an additional six (6) month period if construction of the dwelling has started but is not completed.”

• Manufactured homesLimited

  Manufactured homes placed on individual lots outside a manufactured home park inside Delphi city limits

  • The home must be no more than five years old when first placed outside a park.
  • The home must have all necessary building, water and sewage disposal permits before placement.
  • The home must have wheels, axles and hitches removed, a front door facing the primary street, and exterior and roof materials customary for site-built homes.
  • Manufactured home parks are allowed as special exceptions in R2 and as permitted uses in R3, with a 10-acre minimum park area.

  maximum age when initially placed outside a manufactured home park: <= 5 years (outside a manufactured home park)

  “the manufactured home is no more than five (5) years in age when it is initially placed if outside of a manufactured home park.”

• Subdividing landRegulated (with conditions)

  Land divisions inside Delphi city limits

  • The city lists a Delphi Subdivision Control Ordinance and the UDO subdivision chapters (minor residential, major residential, commercial and industrial, and exempt subdivisions).
  • Subdivision design standards, plat approval and exemptions were not read in full.

  “information regarding zoning and planning may be found here: zoning hoosier heartland overlay delphi udo adoption (updated 2026) delphi subdivsion control ordinance”

• Short-term rentalsLimited

  Short-term rentals of homes and accessory dwellings inside Delphi city limits

  • Owner-occupied short-term rental is a permitted use in R1; non-owner-occupied is a special exception.
  • Units must be lawfully built dwellings; RVs, travel trailers and motor vehicles are excluded.
  • An ILP and annual registration permit are required; without them the rental is a class C infraction.
  • Maximum overnight occupancy is two persons per sleeping area, up to ten people; one off-street parking space per two sleeping areas.
  • Three or more citations in a calendar year can lead to a Board of Zoning Appeals hearing and possible revocation.

  maximum overnight occupancy: <= 10 persons (two per sleeping area)

  “an ilp is required to construct and/or establish a short-term rental unit in order to ensure that the structure meets all of the applicable building codes”

• Permit feesPublished (with conditions)

  Residential building permits for new homes, additions and accessory structures inside Delphi city limits

  • The packet lists base fees as updated 7/11/25; the fee stamp is an update date, not an effective date.
  • Inspection fees (footing, rough-in, insulation, final and re-inspection) are listed separately.
  • Failed or repeat inspections carry a re-inspection fee.

  new residential structure or addition base fee: 450 USD (plus inspection fees) · accessory structure base fee: 75 USD (plus inspection fees)

  “new residential structure or addition $450 accessory structure $75”

• Permit processPublished (with conditions)

  Residential building permit applications inside Delphi city limits

  • Applications go by email (fastest), in person or by mail to the Delphi city building, 201 S. Union Street.
  • Plans larger than 11x17 must be submitted electronically by email.
  • An alternate 10-digit parcel ID and a recorded deed are required; a surveyor-prepared site plan is needed for new homes and additions.

  “applications may be submitted either by email, in person, or by mail.”

Rules another office applies inside Delphi

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

• Who permits septicCounty (with conditions)

  Onsite septic systems serving structures inside Delphi city limits; the Carroll County Health Department issues the septic permit

  • Recorded as health-district with district-specific geography because the schema does not allow county authority with municipality-specific geography.
  • The city UDO refers to the Carroll County Health Department for septic permits, and the health department's environmental health page lists its septic permit application and onsite sewage program.

  “no ilp shall be issued for a structure that is served by a septic system unless a septic permit has been issued by the carroll county health department or the health officer has authorized an approved system.”

• Septic permitRequired

  Structures served by a septic system inside Delphi city limits, before an improvement location permit can issue

  • The city will not issue an ILP for a septic-served structure unless the health department has issued a septic permit or the health officer has authorized an approved system.
  • The septic permit is issued by the Carroll County Health Department, not the city.

  “no ilp shall be issued for a structure that is served by a septic system unless a septic permit has been issued by the carroll county health department or the health officer has authorized an approved system.”

Still unanswered

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

• Owner-builder exemption — Owner-builder construction inside Delphi city limits
• Building code adopted — Construction inside Delphi city limits
• Tiny homes — Tiny homes used as dwellings inside Delphi city limits
• Septic inspection — Septic system inspections for structures inside Delphi city limits
• Well permit — Private water wells for structures inside Delphi 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.