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St. Joseph County, IN Building Setbacks & Zoning: Lot Coverage Limits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Floor area ratio
0.4 maximum
Min lot, no sewer
21,780 square feet
Min lot, sewer
12,000 square feet
Min lot, sewer + water
9,000 square feet
Control method
FAR plus lot area

Summary

St. Joseph County caps development intensity in the R: Single Family District with a floor area ratio of 0.4 and minimum lot sizes from 9,000 to 21,780 square feet, under Zoning Ordinance § 154.107.

These county ordinances apply to unincorporated areas of St. Joseph County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

Floor area ratio. Floor area ratio shall not exceed 0.4.... Single-family detached dwelling: (a) Not less than 21,780 square feet... (c) In a subdivision where all lots in the subdivision are served by public or municipal sewerage and water systems - nine thousand (9,000) square feet

Source: Indiana CodeView official code

Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.

Full Breakdown

St. Joseph County's Area Plan Commission enforces bulk limits under Indiana's Advisory Planning Law (IC 36-7-4-601), which authorizes "requirements for structures, such as location, height, area, bulk, and floor space." Rather than a lot-coverage percentage, the R: Single Family District uses a floor area ratio: § 154.107(E) states the floor area ratio shall not exceed 0.4. Minimum single-family lot area is 21,780 square feet without public sewer, 12,000 square feet on municipal sewer, and 9,000 square feet with public sewer and water. Minimum lot width runs 60 to 100 feet depending on services. These standards keep coverage low across unincorporated Granger and Walkerton.

Violations & Fines

Exceeding the 0.4 floor area ratio or platting a lot below the district minimum violates the St. Joseph County Zoning Ordinance, and the county can reject the permit or plat.

Frequently Asked Questions

Does St. Joseph County limit lot coverage?
Yes, through a floor area ratio. The R: Single Family District caps floor area ratio at 0.4 and sets minimum lot sizes, under Zoning Ordinance § 154.107.
What is the minimum lot size in St. Joseph County?
For a single-family home: 21,780 square feet without public sewer, 12,000 on municipal sewer, and 9,000 with public sewer and water.

Sources & Official References

Other rules in St. Joseph County

Fence Regulations: Height LimitsSome RestrictionsSetback RulesSome RestrictionsParking Rules: RV & Boat ParkingSome RestrictionsStructure Height LimitsSome RestrictionsNoise Ordinances: Decibel LimitsSome RestrictionsParking Rules: Commercial & Oversized VehiclesSignificant RestrictionsFence Regulations: Material RestrictionsHeavy RestrictionsFence Regulations: Fence Permit RequirementsLight Restrictions

All St. Joseph County rules

Compare St. Joseph County to another location·View the Indiana building setbacks & zoning overview

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