Bolthole Index

St. Louis County, Missouri

Zoning, building permits and septic rules in Kirkwood, Missouri

Kirkwood is a city in St. Louis County, Missouri. Kirkwood adopts its own zoning, so inside its limits Kirkwood’s rules apply, not the county’s. 3 rules below are quoted from official sources and independently re-checked, most recently on October 23, 2026. Rules for unincorporated land are on the St. Louis County page.

Answers from the rulebook for Kirkwood

Kirkwood’s own rules

  • Local zoningPresent (with conditions)

    Land inside Kirkwood city limits (City of Kirkwood, St. Louis County, MO). Kirkwood city adopts and administers its own zoning under Chapter 25, Zoning and Subdivision Code.

    • Zoning district, use and dimensional rules apply only after the parcel's district is identified on the official zoning map (§ 25-31).
    • Annexed land keeps its prior zoning, or is zoned R-1 for six months if no zoning existed (§ 25-33).
    “(a) all land within the city of kirkwood shall be placed into at least one of the zoning districts established in table 30-1, and such zoning shall be shown on the official zoning map of the city of kirkwood, missouri.”
  • Zoning districtsPublished (with conditions)

    Land inside Kirkwood city limits. Residential districts are R-1, R-2, R-3, R-4 (single-family), R-MM (missing middle), R-5, R-6, R-7 (multifamily/planned); nonresidential B-1 to B-5 and I-1; special F-1 floodplain district.

    • The official zoning map is on file with the city clerk and is incorporated into the code (§ 25-31(b)-(c)).
    • Table 30-1 lists the districts; dimensional standards for each district were not reached in this run (see unknown dimensional claims).
    “(b) the official zoning map shall be properly attested and shall be on file with the city clerk of the city of kirkwood, missouri.”
  • Building in a floodplainRequired

    Land inside Kirkwood city limits that lies in the F-1 floodplain zoning district (§ 25-34, floodplain district).

    • Applies only to the F-1 floodplain district; land outside F-1 is not covered by this claim.
    • Floodplain development requirements are in chapter 5, article VI, floodway/floodplain management, which was not opened in this run.
    • The floodplain district's purpose and boundaries are set in § 25-34 and § 25-31 and the official zoning map.
    “all activities within this district are subject to the requirements of chapter 5, article vi, floodway/floodplain management.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Kirkwood or St. Louis County directly.

  • Building permit — New residential construction inside Kirkwood city limits
  • Owner-builder exemption — Owner-builder exemption for homeowners building inside Kirkwood city limits
  • Building code adopted — Building codes for construction inside Kirkwood city limits
  • Inspections — Building inspections for construction inside Kirkwood city limits
  • Certificate of occupancy — Certificates of occupancy for new homes inside Kirkwood city limits
20 more unanswered
  • Minimum dwelling size
  • Minimum lot size
  • Setbacks
  • Lot coverage
  • Building height
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • 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 Kirkwood publishes no rule on the point, not that none exists. St. Louis County’s page lists the county offices to call.

Off-grid gear

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

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