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. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.
Federal — start here
1 stopEIN (Employer Identification Number)
Required if you have employees or operate as an LLC or corporation. Free from the IRS.
Official government sourceFreeImmediate (online application)
Free
Immediate (online application)
State of Missouri
1 stopMissouri 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.
Official government sourceFreeImmediate (online application)
Free
Immediate (online application)
City of St. Louis / St. Louis City County
3 stopsMissouri 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.
Official government sourceVaries by city ($100–$300)2–6 weeks
Varies by city ($100–$300)
2–6 weeks
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.
Official government source$50–$500/year depending on business type and gross revenues1–3 weeks
$50–$500/year depending on business type and gross revenues
1–3 weeks
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.
Official government source$50–$300 per project1–5 business days
$50–$300 per project
1–5 business days
Terminus
Open for business — est. $400–$1,200 · 4–10 weeks to obtain all licenses
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Official Sources
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