Zoning, building permits and septic rules in Grand Blanc, Michigan

Grand Blanc’s own rules

• Building code adoptedAdopted (with conditions)

  Building construction inside Grand Blanc city limits; the City's building department enforces the Michigan Building Code

  • The city page names the Michigan Building Code as one of the codes the City's building department enforces; the edition the City has adopted was not confirmed on the official page.
  • The page notes that permits applied for after March 12, 2024 must comply with the 2023 NEC for commercial and three-or-more-family units; earlier permits reference NEC 2017 and MEC 2015.

  “including, but not limited to, the michigan building code.”

• Local zoningPresent (with conditions)

  Land inside Grand Blanc city limits (City of Grand Blanc, Genesee County, MI), not the Charter Township of Grand Blanc or any unincorporated county land

  • The zoning ordinance is adopted as Appendix A to Chapter 1240 (Zoning) of the City's own code of ordinances; the code page shows the 2026 S-3 supplement as current.
  • Uses and dimensions are controlled by the district rules in Articles V through XX of the ordinance.

  “part twelve: planning and zoning code title two: planning title four: zoning chapter 1240: zoning article i: short title”

• Zoning districtsPublished

  Zoning district list for Grand Blanc city inside Grand Blanc city limits

  • The published table of contents lists the residential, commercial, industrial, PUD and special districts; the zoning map was not opened.

  “article v: r-1 through r-3 residential districts article vi: r-t two-family residential districts”

• Minimum dwelling sizeDistrict specific (with conditions)

  Single-family dwellings in the R-1 single-family residential district inside Grand Blanc city

  • Footnote 10 applies to each residence hereafter erected in R-1.
  • For 1-1/2 story homes, the R-1 first floor is 1,200 sq. ft. and the second floor 500 sq. ft.; for 2-story homes, each floor is 825 sq. ft.
  • Upper-level reduction rules and a 450 sq. ft. minimum upper-level area apply to 1-1/2 and 2-story homes under footnote 10.

  minimum floor area, one-story dwelling (R-1): >= 1400 sq ft (1-1/2 and 2-story dwellings follow the footnote 10 table)

  “the following regulations shall govern the minimum floor area required of each residence hereafter erected: r-1 r-2 r-3 1 story 1,400 sq. ft. 1,200 sq. ft. 1,000 sq. ft.”

  2 more reviewed findings on this topic

  • District specific (with conditions) — Single-family dwellings in the R-2 single-family residential district inside Grand Blanc city

    “the following regulations shall govern the minimum floor area required of each residence hereafter erected: r-1 r-2 r-3 1 story 1,400 sq. ft. 1,200 sq. ft. 1,000 sq. ft.”

  • District specific (with conditions) — Single-family dwellings in the R-3 single-family detached or attached residential district inside Grand Blanc city

    “the following regulations shall govern the minimum floor area required of each residence hereafter erected: r-1 r-2 r-3 1 story 1,400 sq. ft. 1,200 sq. ft. 1,000 sq. ft.”

• Minimum lot sizeDistrict specific (with conditions)

  Lots for single-family homes in the R-1 single-family residential district inside Grand Blanc city

  • Footnote 8 cross-references the averaged lot size option (Sec. 2000) and the subdivision open space option (Sec. 2001) for flexibility allowances.
  • Footnote 1: for property containing easements, floodplain or MDNR-regulated wetlands, refer to the lot area definition in section 322.

  minimum lot area: >= 12000 sq ft (averaged lot size and open space options under Sec. 2000 and 2001) · minimum lot width (R-1, per table): >= 90 ft (corner and double-frontage lots per footnote 2)

  “r-1 single family 12,000 sq. ft., 2.7 units/acre8 90 feet8 2 30 309 109 359 25% see footnote 10”

  3 more reviewed findings on this topic

  • District specific (with conditions) — Lots for single-family homes in the R-2 single-family residential district inside Grand Blanc city

    “r-2 single family 9,000 sq. ft., 3.6 units/acre8 75 feet 2 30 259 89 309 25% see footnote 10”

  • District specific (with conditions) — Lots for single-family detached or attached homes in the R-3 residential district inside Grand Blanc city

    “r-3 single family detached or attached 7,200 sq. ft., 4.5 units/acre 65 feet 2 25 259 89 309 25% see footnote10”

  • District specific (with conditions) — Two-family dwelling lots in the R-T two-family residential district inside Grand Blanc city

    “r-t two family residential 4,000 sq. ft., 8.0 units/acre”

• SetbacksDistrict specific (with conditions)

  Principal single-family dwellings in the R-1 single-family residential district inside Grand Blanc city

  • Front-yard averaging applies where 50% or more of the frontage is built to a smaller setback (footnote 5); corner and dual-frontage lots keep front setbacks on all street frontages (footnote 4).
  • Architectural features may project into side yards 2 inches per foot and into front or rear yards 3 feet; an unenclosed porch or paved terrace may project into the front yard up to 10 feet (footnote 6).
  • Accessory building setbacks are governed by Sections 312 through 317 (footnote 7).

  front yard setback: 30 ft (footnote 5 averaging; footnote 6 projections) · each side yard setback: 10 ft (footnote 6 projections) · rear yard setback: 35 ft (footnote 6 projections)

  “r-1 single family 12,000 sq. ft., 2.7 units/acre8 90 feet8 2 30 309 109 359 25% see footnote 10”

  2 more reviewed findings on this topic

  • District specific (with conditions) — Principal single-family dwellings in the R-2 single-family residential district inside Grand Blanc city

    “r-2 single family 9,000 sq. ft., 3.6 units/acre8 75 feet 2 30 259 89 309 25% see footnote 10”

  • District specific (with conditions) — Principal single-family dwellings in the R-3 residential district inside Grand Blanc city

    “r-3 single family detached or attached 7,200 sq. ft., 4.5 units/acre 65 feet 2 25 259 89 309 25% see footnote10”

• Lot coverageSpecified

  All buildings on a lot in the R-1 single-family residential district inside Grand Blanc city

  • Column is maximum lot coverage by all buildings.

  maximum lot coverage by all buildings: <= 25 %

  “r-1 single family 12,000 sq. ft., 2.7 units/acre8 90 feet8 2 30 309 109 359 25% see footnote 10”

  2 more reviewed findings on this topic

  • Specified — All buildings on a lot in the R-2 single-family residential district inside Grand Blanc city

    “r-2 single family 9,000 sq. ft., 3.6 units/acre8 75 feet 2 30 259 89 309 25% see footnote 10”

  • Specified — All buildings on a lot in the R-3 residential district inside Grand Blanc city

    “r-3 single family detached or attached 7,200 sq. ft., 4.5 units/acre 65 feet 2 25 259 89 309 25% see footnote10”

• Permit processPartial

  Permit applications handled by the City of Grand Blanc Building Department

  • Online applications are accepted only for electrical, plumbing and mechanical permits per the page; paper applications by email, mail or walk-in are also accepted.
  • The page states a $3.00 fee to apply online.

  “we are ready to start accepting online permit applications for electrical, plumbing, and mechanical!”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Grand Blanc or Genesee County directly.

• Building permit — Building permit requirement for new homes inside Grand Blanc city
• Owner-builder exemption — Owner-builder exemption from City building permits
• Inspections — Building inspections for new homes inside Grand Blanc city
• Certificate of occupancy — Certificate of occupancy for new homes inside Grand Blanc city
• Living in an RV — Occupancy of a recreational vehicle as a dwelling inside Grand Blanc city

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.