St. Louis County
St. Louis County Department of Transportation and Public Works
In short
St. Louis County Department of Transportation and Public Works issues 3 permits we publish for St. Louis County, last verified 2026-10-05. Each carries the fee as the agency publishes it, with a link to the schedule it was read from.
What this agency issues
| Permit | Issuing agency | Fee | Renews | Last checked |
|---|---|---|---|---|
| Plumbing License | St. Louis County Department of Transportation and Public Works | The Plumbing Licensing page publishes no license fee amount. Contact the Department of Transportation and Public Works for the current fee. | not stated on the plumbing licensing page | 2026-10-05 |
| Commercial Building Permit | St. Louis County Department of Transportation and Public Works | The Table 1100.050 rate applied to the total estimated cost of construction, plus a $47.00 permit processing fee added to the tabular fee | per permit | 2026-10-05 |
| Individual Sewage Disposal System (Septic) Permit | St. Louis County Department of Transportation and Public Works | $284 minimum per installation: $96.00 processing and plan review plus $188.00 for up to four inspections; $47.00 for each additional or extra inspection | per permit | 2026-10-05 |
Fees shown as a range or formula are set that way by the issuing agency — we do not average them into a single number.
About each permit
Plumbing License
The county's Plumbing Licensing page describes the process for obtaining a plumbing license in St. Louis County and lists the master plumbers and master drainlayers licensed to work in the county. The page publishes no license fee amount. The page sits under the Department of Transportation and Public Works. The contractor tag follows from the page's licensed-contractor lists, which cover plumbing contractors and drainlayers.
Commercial Building Permit
Ordinance 29,445, adopted November 4, 2025 and approved November 5, 2025, Sec. 1100.050, sets the commercial building permit fee as the Table 1100.050 rate applied to the total estimated cost of construction, and states that a permit processing fee of $47.00 is added to the tabular fee. The table is a rate schedule, so this record states the rule and no single dollar amount. Sec. 1100.035 lets the Director of the Department of Transportation and Public Works revise permit processing fees annually, effective July 31. No revision effective July 31, 2026 is published on the county's codes and ordinances page or the commercial building page, so the rate table and the $47.00 fee are stated as enacted. The contractor tag reflects that the permit covers commercial, industrial and multiple-family residential construction.
Individual Sewage Disposal System (Septic) Permit
Ordinance 29,445, Sec. 1100.200, adopted November 4, 2025, states that the minimum fee for installing a septic system is $284.00, which includes $96.00 of permit processing and plan review and $188.00 for up to four inspections. A $47.00 fee applies to each additional or extra inspection. Sec. 1100.035 allows permit processing fees to be revised annually, effective July 31, and no revision effective July 31, 2026 is published on the county's codes and ordinances page.
Contact
- Jurisdiction
- St. Louis County
- Phone
- Not verified — use the website
Contact details are taken from the agency’s own site or its published fee schedule. Where we have not verified a phone number we leave it blank rather than guess.
Sources
Every fee and term above was read from one of these government pages on the date shown.
- Ordinance 29,445 (Bill 265, 2025) — Code Enforcement Fee Schedule, Chapter 1100St. Louis County, Missouri · primary source · retrieved 2026-10-05
- St. Louis County Plumbing LicensingSt. Louis County, Missouri · primary source · retrieved 2026-10-05
Other offices serving St. Louis County
The full permit list for this jurisdiction
Industry permit lists that include this agency
Missouri jurisdictions
Commercial Compliance Hub publishes information, not legal advice. Requirements change — confirm anything you rely on with the issuing agency before you file.