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.
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 requirementsMissouri 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.
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.
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.
Missouri State Requirements
1 requirementMissouri 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.
Federal Requirements
1 requirementEIN (Employer Identification Number)
Required if you have employees or operate as an LLC or corporation. Free from the IRS.
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