Bolthole Index

St. Louis County, Missouri

Zoning, building permits and septic rules in Brentwood, Missouri

Brentwood is a city in St. Louis County, Missouri. Brentwood adopts its own zoning, so inside its limits Brentwood’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 Brentwood

Brentwood’s own rules

  • Building code adoptedAdopted

    Electrical work inside Brentwood city limits

    • Adopts the 2023 National Electrical Code with city amendments, per ordinance 5204 dated 12-15-2025; permits and fees are referenced for electrical work.
    “the national electrical code, 2023 edition, as published by the national fire protection association, be and is hereby adopted as the electrical code of the city of brentwood, missouri”
  • Local zoningPresent (with conditions)

    Land inside Brentwood city limits; the city's own Chapter 400 Zoning ordinance applies

    • The code's table of contents lists Chapter 400 Zoning with sections 400.010 through 400.3340; district boundaries and dimensional tables were not opened in this run.
    “title iv land use chapter 400 zoning (section 400.010 – section 400.3340)”
  • Subdividing landRegulated (with conditions)

    Land divisions inside Brentwood city limits

    • Subdivision standards are in Chapter 405 Subdivisions; its substantive requirements were not opened in this run.
    “chapter 405 subdivisions (section 405.010 – section 405.420)”

Still unanswered

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

  • Building permit — New residential construction inside Brentwood city limits
  • Owner-builder exemption — Owner-builder construction inside Brentwood city limits
  • Inspections — Construction inside Brentwood city limits
  • Zoning districts — Zoning districts inside Brentwood city limits
  • Minimum dwelling size — Dwellings inside Brentwood city limits
21 more unanswered
  • 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
  • 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 Brentwood 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 Brentwood means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

← All of St. Louis County: county rules, score and offices