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Jefferson County

Jefferson County Code Enforcement Division

In short

Jefferson County Code Enforcement Division issues 4 permits we publish for Jefferson County, last verified 2026-10-27. Each carries the fee as the agency publishes it, with a link to the schedule it was read from.

What this agency issues

Permits required, with issuing agency, fee, renewal term and the date each record was last verified against its source
Commercial Building Permitonly if it applies to youJefferson County Code Enforcement DivisionCommercial plan review submittal $200 (credited to the total fee) + processing fee $25 + Planning and Zoning fee $10 + permit fee by construction cost, using a commercial valuation of $235 per square foot: $650 for $1–$10,000, rising by bracket to $5,060 for $900,001–$1,000,000 and $11,300 for $4,750,001–$5,000,000; over $5,000,000, cost × 0.230%. Inspection or re-inspection $50. Commercial miscellaneous permits: electrical panel $165, $188, $205 or $218 by size; meter base $67, $78 or $84; low voltage $155; miscellaneous electric $160; plumbing $160; mechanical $180; demolition $185; floodplain development $75; ADA ramp $75; event tents up to 250 sq ft $125, 251 sq ft and over $0.50 per sq ft.per project2026-10-27
Sign Permitonly if it applies to youJefferson County Code Enforcement DivisionBuilding sign $425; monument or pole sign $530; billboard $600; plus a Planning and Zoning sign fee of $150.per sign2026-10-27
Onsite Sewage System Permitonly if it applies to youJefferson County Code Enforcement DivisionNew system $295; imported soil preparation $50; field repair or replacement $195; tank replacement $155.per project2026-10-27
County Contractor License (Plumbing, Electrical, Mechanical and Related Trades)Jefferson County Code Enforcement Division$30 nonrefundable application fee + $150 license fee on approval ($100 for soil evaluator or on-site system testing). Renewal $30; extension $30; inactive license renewal $50; reinstatement of an expired license $150.not stated on the Contractor Licenses page or the application forms2026-10-27

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

Commercial Building Permit

The county's Permits page states: "On July 26, 2021 the Jefferson County, Missouri Council adopted Ordinance Number 21-0356 … adopting a new fee schedule to apply to all building permits. The new fee schedule is in effect for ALL PERMITS." The ordinance amends County Code §500.250. Its schedule sets a commercial plan review submittal fee of $200, paid with the application and deducted from the total fee, a $25 processing fee, a $50 inspection or re-inspection fee and a $10 Planning and Zoning fee. The commercial permit fee is set by construction cost brackets, from $650 for work up to $10,000 to $11,300 for $4,750,001 to $5,000,000, and cost times 0.230% above $5,000,000. The ordinance also lists commercial miscellaneous permits, including electrical panels from $165 to $218, plumbing $160, mechanical $180, demolition $185 and floodplain development $75. Under §2 the ordinance took effect thirty days after publication in full.

Sign Permit

Ordinance 21-0356, which amends the County Code §500.250 fee schedule, lists sign permit fees in §500.250(A)(15): $425 for a building sign, $530 for a monument or pole sign and $600 for a billboard, plus a $150 Planning and Zoning sign fee. The same $150 sign permit amount appears on the Planning Division's fee schedule. The county's Permits page states that the Ordinance 21-0356 fee schedule "is in effect for ALL PERMITS." A business installing a building, monument or pole sign applies through the Code Enforcement Division.

Onsite Sewage System Permit

Ordinance 21-0356, which amends the County Code §500.250 fee schedule, lists onsite sewage system fees in §500.250(A)(11): $295 for a new system, $50 for imported soil preparation, $195 for a field repair or replacement and $155 for a tank replacement. The county's Permits page states that the Ordinance 21-0356 fee schedule "is in effect for ALL PERMITS." The permit applies to a business site served by an onsite sewage system rather than a public sewer. Installers, designers and soil evaluators hold county contractor licenses, which are a separate record.

County Contractor License (Plumbing, Electrical, Mechanical and Related Trades)

The county's Contractor Licenses page states: "The Code Official is authorized to grant a license to any contractor, firm or corporation found to be qualified to engage in certain work," and lists licenses for plumbing, electrical, electrical communication, mechanical, sprinkler fitter, lawn irrigation, on-site sewer installer and designer, and soil evaluator contractors. Ordinance 21-0356, §500.250(A)(16), sets a $150 license fee ($100 for soil evaluator or on-site system testing), a $30 nonrefundable application fee, $30 renewal and extension fees, a $50 inactive renewal and $150 to reinstate an expired license. The plumbing, electrical and mechanical application forms each require a $25,000 license and permit bond naming the county, a liability insurance certificate of $1,000,000 aggregate and $250,000 per occurrence, and a passing master exam score of at least 70% within the past six years.

Contact

Jurisdiction
Jefferson County
Phone
636-797-5310

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.

  1. Contractor LicensesJefferson County, Missouri · primary source · retrieved 2026-10-27
  2. Electrical Contractor License ApplicationJefferson County, Missouri · primary source · retrieved 2026-10-27
  3. Fees Schedule for Planning and Zoning Activities, Jefferson County, Missouri (Effective: November 1, 2020)Jefferson County, Missouri · primary source · retrieved 2026-10-27
  4. Mechanical Contractor License ApplicationJefferson County, Missouri · primary source · retrieved 2026-10-27
  5. Ordinance 21-0356 (Bill 21-0707): Amending Section 500.250 Fee ScheduleJefferson County, Missouri · primary source · retrieved 2026-10-27
  6. PermitsJefferson County, Missouri · primary source · retrieved 2026-10-27
  7. Plumbing Contractor License ApplicationJefferson County, Missouri · primary source · retrieved 2026-10-27

Other offices serving Jefferson County

The full permit list for this jurisdiction

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Commercial Compliance Hub publishes information, not legal advice. Requirements change — confirm anything you rely on with the issuing agency before you file.