Plumbing Contractor Permit Requirements in St. Louis, MO

Complete permit and license guide for starting a plumbing contractor in St. Louis, St. Louis City County, Missouri.

$400 -- $1200 4–10 weeks to obtain all licenses 5 requirements

Not legal advice. Requirements may change — always verify with your local government authority before applying. Last verified: .

St. Louis / St. Louis City County Requirements

3 requirements
1

Missouri Plumbing Contractor License (local jurisdictions)

Missouri plumbing licenses are issued at the local level. Kansas City and St. Louis both require Master Plumber licenses for business owners.

Varies by city ($100–$300)2–6 weeks
Official government source
2

City of St. Louis License Collector — Business License

St. Louis City is an independent city (not part of St. Louis County) and requires a Business License from the License Collector's office. This license must be renewed annually and displayed at your place of business.

$50–$500/year depending on business type and gross revenues1–3 weeks
Official government source
3

St. Louis City County / St. Louis Plumbing Permit (per project)

A separate permit must be pulled with the local building/plumbing department for each job. Inspections are required upon job completion.

$50–$300 per project1–5 business days
Official government source

Missouri State Requirements

1 requirement
1

Missouri Department of Revenue — Sales Tax License

Required for all businesses selling taxable goods in Missouri. The state rate is 4.225%; local rates vary by city and county. Register online with the Missouri Department of Revenue.

FreeImmediate (online application)
Official government source

Federal Requirements

1 requirement
1

EIN (Employer Identification Number)

Required if you have employees or operate as an LLC or corporation. Free from the IRS.

FreeImmediate (online application)
Official government source

Official Sources

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