Bolthole Index

Hendricks County, Indiana

Zoning, building permits and septic rules in Plainfield, Indiana

Inside the Town of Plainfield, Hendricks County, Indiana, the town writes its own zoning ordinance1, and the town's building department issues building permits2. Septic permits are a separate matter: onsite septic systems fall under the Hendricks County Health Department's rules, though we could not confirm how that works inside town limits3. Land outside town limits answers to the county instead.

At a glance

Zoning
Plainfield's own zoning ordinance, not county zoning1
Building permits
Issued by the Town of Plainfield building department2
Building code
Indiana building code articles (Title 675 IAC) adopted by the town4
Minimum lot (RR / R-1)
65,000 sq ft in RR; 30,000 sq ft in R-156
Minimum home size
1,700 sq ft main floor, one-story, in both RR and R-178
Public sewer
Required for single-family homes in R-1; not mandatory in RR95
Septic
Hendricks County Health Department rules; inside-town role unconfirmed3

Who to call

Building permits

Town of Plainfield Development Services (Building Department)

Building permit applications and inspections inside Plainfield town limits

317-839-2561

206 W. Main Street Plainfield, Indiana 46168

Zoning

Town of Plainfield Planning Department

Zoning compliance and current planning inside Plainfield town limits

317-754-5376

Septic permits

Hendricks County Health Department (Environmental Health)

Onsite sewage (septic) system permits and inspections under 410 IAC 6-8.3 for Hendricks County

(317) 745-9217

355 S Washington St #G40, Danville, IN 46122

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 Plainfield means bringing your own water and power. The kit we’d start with:

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

Yes. The Town of Plainfield adopts and administers its own zoning ordinance inside town limits, not county zoning1. The Town's planning department handles zoning compliance10. The rules differ by district, so check your parcel's district on the town zoning map first.

In the RR Rural Residential district, the minimum lot is 65,000 sq ft with 150 feet of lot width5. RR lots may cover at most 10 percent11, and the side yard is at least 20 feet12.

In the R-1 Low Density Residential district, the minimum lot is 30,000 sq ft with 100 feet of width6. R-1 lots may cover at most 20 percent13, with a 30-foot front yard and 10-foot side yard14. The primary building may be up to 35 feet tall15.

We could not confirm how Plainfield's zoning treats RVs or tiny homes as a place to live; ask the Planning Department before you buy.

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

The Town of Plainfield's building department is in charge of all building permits within town limits, including foundations, buildings, pools, decks, and accessory buildings10. Applicants complete the town's building application form and attach the required plans2.

The Town has adopted the Indiana building code articles in Title 675 of the Indiana Administrative Code as its building code4. We did not confirm every exemption from the permit requirement, so call the building department before starting small projects.

The town adopted a new fee schedule on January 12, 2026, with some fees starting February 10, 20262. Hendricks County's building permits cover unincorporated land only.

Does Plainfield require public sewer, or can you use a septic system?

Single-family homes in the R-1 district must attach to public or semi-public water and sewer9. The RR Rural Residential district does not show a mandatory attachment5, so a septic system is the more likely path for a rural-residential lot.

Indiana requires a written septic permit signed by the health officer for residences not connected to sanitary sewerage16. The state rule is administered by local health departments3, and the Hendricks County Health Department's Environmental Health division runs the septic program17.

We could not confirm whether the county or the town handles septic permits for a lot inside Plainfield limits. Call the Hendricks County Health Department first, since local plan commission approval does not replace the health officer's approval18.

Can you build an owner-built home or live in an RV in Plainfield?

We could not confirm whether Plainfield has an owner-builder exemption or allows living in an RV or tiny home on a lot while you build. Hendricks County does have an owner-builder exemption, but it applies within the County Planning and Building Department's jurisdiction, not inside town limits19. Ask the Town's building department about owner-built homes, and the Planning Department about temporary housing.

Minimum dwelling size also matters: the RR and R-1 districts both set a minimum main floor of 1,700 sq ft for a one-story home78, which rules out most tiny homes as a permanent house.

How do you build a home in Plainfield, step by step?

  1. Find your parcel's zoning district with the Planning Department and confirm lot size and setbacks10.
  2. Check whether the district requires public water and sewer9.
  3. If you will use septic, contact the Hendricks County Health Department's Environmental Health division before you design the house17.
  4. Submit the building application and plans to the Town's building department2.
  5. Build to the Indiana building code the Town has adopted4.
  6. A driveway onto a state highway needs a permit from the Indiana Department of Transportation20.

What stays with Hendricks County, and what to check before you buy?

Land outside Plainfield town limits falls under Hendricks County, not the Town; see the Hendricks County page. Septic permits come from the county health department17.

Before buying, check flood risk: development in an Indiana floodway needs a state permit21. Soils matter too: only about 0.6 percent of Hendricks County soils rate not limited for a conventional septic drain field, so expect a site evaluation or an engineered system22.

Hendricks County's effective property tax rate is 0.8 percent23, and the median property tax bill is $2,344 per year24.

Watch-outs

  • Plainfield's zoning ordinance copy runs through Ord. 02-2024, so ask the Planning Department whether later amendments changed your parcel's district1.
  • We could not confirm who issues septic permits for lots inside Plainfield limits; call the Hendricks County Health Department and the Town building department before you buy17.
  • Plainfield's fee schedule changed in January 2026, so older fee figures you find online may be out of date2.

Sources

  1. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  2. Town of Plainfield Development Services (Building Department) (townofplainfield.com)
  3. 410 IAC 6-8.3 Residential Onsite Sewage Systems, quoted and re-checked
  4. Town of Plainfield - Ordinances & Standards (Town of Plainfield), quoted and re-checked
  5. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  6. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  7. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  8. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  9. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  10. Town of Plainfield Planning Department (townofplainfield.com)
  11. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  12. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  13. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  14. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  15. Plainfield Zoning Ordinance (Through Ord 02-2024) with TOC (Town of Plainfield), quoted and re-checked
  16. Indiana Register: 410 IAC 6-8.3-53 Construction permits, quoted and re-checked
  17. Hendricks County Health Department (Environmental Health) (co.hendricks.in.us)
  18. Indiana Register: 410 IAC 6-8.3-53 Construction permits, quoted and re-checked
  19. § 150.01 Listing of Building Contractors, quoted and re-checked
  20. INDOT Driveway Permit Guide 2024 (Indiana statewide rule), quoted and re-checked
  21. Water: Community Assistance & Information (Indiana statewide rule), quoted and re-checked
  22. 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
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data

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 Plainfield

Town of Plainfield’s own rules

  • Building code adoptedAdopted

    Construction inside Plainfield town limits: the Town has adopted the Indiana building code articles (Title 675, Indiana Administrative Code) as its building code.

    • The Town's page says the current codes should be checked with the Indiana Association of Building Officials and state amendments on the Indiana website.
    • Local amendments to the building chapter, such as Ordinance 30-2025, were not reviewed.
    “the town of plainfield adopted the articles of title 675 of the indiana administrative code.”
  • Local zoningPresent

    Land inside Plainfield town limits: the Town of Plainfield adopts and administers its own zoning ordinance (Plainfield Zoning Ordinance, through Ord. 02-2024), not county zoning.

    • The consolidated copy is stated to run through Ord. 02-2024; later amendments (for example Ordinance 26-2025 rezoning land to R-1) were not reviewed against it.
    • Zoning ordinance is the Town's own ordinance; it is not a county rule.
    “2.2. r-1: low density residential district intent. the r-1: low density residential districts are intended to protect, promote and maintain areas”
  • Zoning districtsPublished

    Zoning districts inside Plainfield town limits

    • The district list (rr, r-1 through r-6, ri, ru, rf, tc, nr, od, gc, ac, hb, ci, i1 through i4, ag, s, rel, g, ig, p) and the zoning map were not reviewed in full.
    “2.2. r-1: low density residential district intent. the r-1: low density residential districts are intended to protect, promote and maintain areas”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Single-family dwellings in the R-1 Low Density Residential district inside Plainfield town limits

    • Two-story main floor and total finished floor area minimums differ from the one-story minimum.

    minimum main floor area, one-story building: >= 1700 sq ft · minimum main floor area, two or more story building: >= 1200 sq ft · minimum total finished floor area: >= 1700 sq ft

    “d. minimum main floor area one story building unit rr r1 r2 r3 r4 r5 main floor sq. ft. 1,700 1,700 1,500 1,300 1,200 1,000”
    One more reviewed finding on this topic
    • District specific (with conditions) — Single-family dwellings in the RR Rural Residential district inside Plainfield town limits
      “d. minimum main floor area one story building unit rr r1 r2 r3 r4 r5 main floor sq. ft. 1,700 1,700 1,500 1,300 1,200 1,000”
  • Minimum lot sizeDistrict specific (with conditions)

    Lots in the R-1 Low Density Residential district inside Plainfield town limits

    • Minimum lot frontage applies on a public street with direct access from it or an abutting alley (note 1).
    • Lots in the R-1 district must attach to public or semi-public water and sewer (see utility_connection claim).

    minimum lot area: >= 30000 sq ft · minimum lot width: >= 100 feet · minimum lot frontage: >= 50 feet (on a public street and gain direct access from said public street or an abutting alley)

    “minimum lot area sq. ft. 65,000 30,000 15,000 221 r3 10,000 r4 6,000 r5(a) 5,000 r5(b) 10,000 minimum lot width feet 150 100 90(2) 80(2) 60 50 70 minimum lot frontage (1) feet 90 50 40 35 25 25 35”
    One more reviewed finding on this topic
    • District specific (with conditions) — Lots in the RR Rural Residential district inside Plainfield town limits
      “minimum lot area sq. ft. 65,000 30,000 15,000 221 r3 10,000 r4 6,000 r5(a) 5,000 r5(b) 10,000 minimum lot width feet 150 100 90(2) 80(2) 60 50 70 minimum lot frontage (1) feet 90 50 40 35 25 25 35”
  • SetbacksDistrict specific (with conditions)

    Primary and accessory structures on lots in the R-1 Low Density Residential district inside Plainfield town limits

    • The side-yard note (1) for pre-January 1, 2007 plats is attached to the R-2 and R-3 columns, not to R-1.

    front yard, primary structure: >= 30 feet · front yard, unenclosed porch: >= 20 feet · side yard, minimum: >= 10 feet · rear yard, accessory building: >= 10 feet · rear yard, primary building: >= 25 feet

    “minimum yards and setbacks (side) unit rr r1 r2 r3 r4 r5 minimum yard feet 20 10 12 (1) 10 (1) 6 6 minimum yards and setbacks (rear) unit rr r1 r2 r3 r4 r5 accessory building feet 35 10 10 5 5 5 primary building feet 25 25 25 20 20 20”
    One more reviewed finding on this topic
    • District specific (with conditions) — Primary and accessory structures on lots in the RR Rural Residential district inside Plainfield town limits
      “minimum yards and setbacks (side) unit rr r1 r2 r3 r4 r5 minimum yard feet 20 10 12 (1) 10 (1) 6 6 minimum yards and setbacks (rear) unit rr r1 r2 r3 r4 r5 accessory building feet 35 10 10 5 5 5 primary building feet 25 25 25 20 20 20”
  • Lot coverageDistrict specific (with conditions)

    Lots in the R-1 Low Density Residential district inside Plainfield town limits

    maximum lot coverage: <= 20 percent

    “maximum lot coverage 10% 20% 35% 35% 40% 40% 40%”
    One more reviewed finding on this topic
  • Building heightDistrict specific (with conditions)

    Buildings in the R-1 Low Density Residential district inside Plainfield town limits

    maximum primary building height: <= 35 feet · maximum accessory building height: <= 25 feet

    “c. maximum building height unit rr r1 r2 r3 r4 r5 primary building height feet 35 35 35 35 35 35 accessory building height feet 25 25 25 25 25 25”
    One more reviewed finding on this topic
    • District specific (with conditions) — Buildings in the RR Rural Residential district inside Plainfield town limits
      “c. maximum building height unit rr r1 r2 r3 r4 r5 primary building height feet 35 35 35 35 35 35 accessory building height feet 25 25 25 25 25 25”
  • Mandatory utility hookupWater and sewer (with conditions)

    Single-family dwellings on lots in the R-1 Low Density Residential district inside Plainfield town limits

    • Mandatory attachment is shown as yes for R-1 (and for R-2 through R-5) in the single-family development standards matrix.
    • The matrix shows no mandatory attachment for the RR Rural Residential district.
    • Distance or availability thresholds were not found in the matrix; the matrix states the attachment requirement only.
    • Sewer Use Ordinance 06-2017 and Water Connections Ordinance 19-97 are listed on the Town's page but were not opened.
    “mandatory attachment to no yes yes yes yes yes yes public/semi-public water and sewer”

Still unanswered

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

  • Building permit — New construction inside Plainfield town limits
  • Owner-builder exemption — Owner-built homes inside Plainfield town limits
  • Inspections — Construction inside Plainfield town limits
  • Certificate of occupancy — New dwellings inside Plainfield town limits
  • Camping on your land — Temporary camping on private land inside Plainfield town limits
14 more unanswered
  • Tiny homes
  • Manufactured homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Subdividing land
  • 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 Town of Plainfield publishes no rule on the point, not that none exists. Hendricks County’s page lists the county offices to call.

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