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9 permits · verified 2026-10-05

What permits do you need to open a contractor or trade in St Louis County Mo?

In short

A contractor or trade in St Louis County Mo, MO has 3 permits that apply to every business of this type, plus 6 more that depend on your premises, signage or how you are set up. St. Louis County Department of Transportation and Public Works charges $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 for the individual sewage disposal system (septic) permit. 4 of the 9 are charged as a range or formula rather than a flat fee. Verified 2026-10-05 against the issuing agencies’ published fee schedules.

Permits particular to a contractor or trade in St Louis County Mo

Permits required, with issuing agency, fee, renewal term and the date each record was last verified against its source
Plumbing LicenseSt. Louis County Department of Transportation and Public WorksThe 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 page2026-10-05
Commercial Building PermitSt. Louis County Department of Transportation and Public WorksThe Table 1100.050 rate applied to the total estimated cost of construction, plus a $47.00 permit processing fee added to the tabular feeper permit2026-10-05
Individual Sewage Disposal System (Septic) PermitSt. 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 inspectionper permit2026-10-05
Statewide Electrical Contractor License (optional)only if it applies to youMissouri Office of Statewide Electrical Contractors, Division of Professional Registration$200 to open; renewal is $100 every three yearstriennial — all licenses expire together and renew on the same three-year cycle2026-09-04
General Contractor License — Missouri state position (local licensing)only if it applies to youMissouri Division of Professional RegistrationNo feeset by the city or county2026-09-04

Fees shown as a range or formula are set that way by the issuing agency — we do not average them into a single number.

MO registrations that apply to every type of business

Permits required, with issuing agency, fee, renewal term and the date each record was last verified against its source
Articles of Organization (LLC)only if it applies to youMissouri Secretary of State, Corporations Division$50 filed online; $105 on paperperpetual — a Missouri LLC files no annual report at all2026-09-04
Articles of Incorporationonly if it applies to youMissouri Secretary of State, Corporations DivisionVaries — formula on the MO pageperpetual, but an annual registration report is due every year2026-09-04
Corporate Annual Registration Reportonly if it applies to youMissouri Secretary of State, Corporations DivisionVaries — formula on the MO pageannual by default, due the month the corporation was formed — a two-year cycle may be elected instead, at $40 online or $90 on paper2026-09-04
General Business License — Missouri state positiononly if it applies to youMissouri Department of RevenueNo feeset by the city or county2026-09-04

Fees shown as a range or formula are set that way by the issuing agency — we do not average them into a single number.

How much does it actually cost to permit a contractor or trade in St Louis County Mo?

There is no single figure, and any site quoting one is rounding away the part that matters. Of the 9 records listed for a contractor or trade in St Louis County Mo, MO, 3 apply to every business of this type and 6 are conditional. Adding every fee on the page together would overstate what most operators pay, because it would include permits they never need.

Of the 3 that always apply, 1 carry a flat fee, coming to $284.00. That is a floor, not a total. 4 of the 9 are charged as a range or a formula set by the issuing agency, and 2 have no fee published at all. The ones particular to this business that vary:

Plumbing License: The Plumbing Licensing page publishes no license fee amount. Contact the Department of Transportation and Public Works for the current fee.

Commercial Building Permit: 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

The other 2 variable fees belong to permits that apply to every type of business here; their formulas are set out on the St Louis County Mo permits page and the MO state page.

Which offices issue these permits in St Louis County Mo?

Permits for a contractor or trade in St Louis County Mo, MO come from 5 separate offices: St. Louis County Department of Transportation and Public Works, Missouri Secretary of State, Corporations Division, Missouri Office of Statewide Electrical Contractors, Division of Professional Registration, Missouri Division of Professional Registration, Missouri Department of Revenue. No single office issues them all, which is why an opening means filing in several places rather than one.

What does a contractor or trade need in St Louis County Mo that other businesses do not?

5 of the 5 permits particular to a contractor or trade here apply to no other business type we cover in St Louis County Mo: Plumbing License, Commercial Building Permit, Individual Sewage Disposal System (Septic) Permit and 2 more.

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.

Statewide Electrical Contractor License (optional)

This license exists to solve one specific problem and nothing more: a contractor working across several Missouri jurisdictions no longer needs a separate local electrical license in each one, because state law obliges every city and county to recognise this statewide credential in place of its own. It does not abolish local licensing — a city may keep issuing its own electrical contractor license to everyone else, keep requiring a business license, keep issuing permits and inspecting work, and keep licensing individual electricians on its own examination, all in parallel with this statewide option. The state gives that recognition rule real teeth: a political subdivision that refuses to honour a statewide license risks having its own share of state sales tax withheld until it complies. Two hundred dollars to obtain it and $100 to renew, on a shared three-year cycle rather than one tied to the individual holder.

General Contractor License — Missouri state position (local licensing)

The Division of Professional Registration's own list of every board it administers includes Electrical Contractors but has no general contractor, plumbing or HVAC board, so there is no state fee for any of those three licenses. Plumbing licensing is confined by statute to cities of 15,000 people or more and to first-class counties, each running its own board of examiners and its own local code, and HVAC work is regulated only where a city chooses to license it. A contractor working across several Missouri municipalities may need a separate local license in each one for these trades. Electrical work is the exception — see the statewide electrical contractor record.

The 4 state-level registrations apply to every type of business across MO and are covered on the MO state page.

How does a contractor or trade compare with other businesses in St Louis County Mo?

The closest match is a coffee shop, which shares 0 of these permits. A contractor or trade also needs Plumbing License, Commercial Building Permit, Individual Sewage Disposal System (Septic) Permit and 2 more. A coffee shop needs Food Establishment Plan Review, Food Establishment Health Permit, Food Establishment Permit (local, not state) and Food Handler Card (local, not state), which a contractor or trade does not.

Permits particular to each business type in St Louis County Mo, MO, compared with a contractor or trade
BusinessIts own permitsShared with a contractor or tradeOnly a contractor or trade needsOnly it needs
Coffee shops4054
Food trucks4054
Restaurants8058
Retail stores3053

Sources

Every figure for the permits explained on this page was read from one of these government pages on the date shown. Sources for the permits that apply to every type of business are listed on the St Louis County Mo permits page and the MO state page. Confirmed by Editorial Team.

  1. St. Louis County Plumbing LicensingSt. Louis County, Missouri · primary source · retrieved 2026-10-05
  2. Ordinance 29,445 (Bill 265, 2025) — Code Enforcement Fee Schedule, Chapter 1100St. Louis County, Missouri · primary source · retrieved 2026-10-05
  3. Office of Statewide Electrical Contractors — fee schedule effective 30 June 2019Missouri Office of Statewide Electrical Contractors · primary source · retrieved 2026-09-04
  4. Office of Statewide Electrical Contractors — FAQ for political subdivisions, explaining the preemption and recognition ruleMissouri Office of Statewide Electrical Contractors · primary source · retrieved 2026-09-04
  5. Missouri Division of Professional Registration — the complete list of every board it administers, containing no HVAC or mechanical contractor boardMissouri Division of Professional Registration · primary source · retrieved 2026-09-04
  6. Missouri Revised Statutes chapter 341 — plumbers and plumbing, licensed only in cities of 15,000 or more and first-class countiesMissouri General Assembly, Office of the Revisor of Statutes · primary source · retrieved 2026-09-04

Related

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