What Can a Handyman Do Without a License in O'Fallon, Missouri (St. Charles County)?

By Ray Duke, Founder of Bulletproof Handyman · Last reviewed July 2026

Missouri is a local-only contractor licensing state with no statewide general contractor license. O'Fallon, located in St. Charles County, requires a city business license ($50 minimum for home-based services) and county trade licenses for any permit-required electrical, plumbing, or HVAC work. There is no statewide handyman dollar-threshold exemption in Missouri—exemptions are determined locally by O'Fallon and St. Charles County ordinances. Handymen can perform general repairs, painting, and carpentry without a license, but any work touching electrical systems, plumbing, or HVAC requires appropriate county trade licensing.

✅ What You Can Do Without a License

• General carpentry and woodworking (non-structural repairs, trim work, cabinet installation)
• Interior and exterior painting (residential, non-commercial)
• Drywall repair and patching (minor, non-structural)
• Flooring installation and repair (non-structural, excluding load-bearing changes)
• Door and window replacement (non-structural, not affecting building envelope integrity)
• Deck and fence building (subject to local permit requirements—verify with O'Fallon)
• General handyman repairs (caulking, weatherstripping, minor repairs)
• Fixture replacement (light fixtures, faucets, cabinet hardware—NOT electrical or plumbing work)
• Note: Even exempt work may require permits. Always verify with O'Fallon and St. Charles County before starting any job.

Common Jobs Handymen Take in O'Fallon

Based on the MO threshold, handymen in O'Fallon commonly take on:

• General carpentry and woodworking (non-structural repairs, trim work, cabinet installation)
• Interior and exterior painting (residential, non-commercial)
• Drywall repair and patching (minor, non-structural)
• Flooring installation and repair (non-structural, excluding load-bearing changes)
• Door and window replacement (non-structural, not affecting building envelope integrity)
• Deck and fence building (subject to local permit requirements—verify with O'Fallon)
• General handyman repairs (caulking, weatherstripping, minor repairs)
• Fixture replacement (light fixtures, faucets, cabinet hardware—NOT electrical or plumbing work)

⚠️ What Requires a License

• Any electrical work beyond simple fixture changes (outlet installation, panel work, rewiring, new circuits) — requires St. Charles County Electrical Contractor License and/or Missouri Statewide Electrical Contractor License
• Any plumbing work beyond simple fixture replacement (pipe installation, water line work, drain modifications, water heater installation) — requires St. Charles County Plumbing Contractor License
• HVAC system installation, repair, or modification (furnace, air conditioning, ductwork) — requires St. Charles County Mechanical/HVAC Contractor License
• Structural modifications (load-bearing wall removal, foundation work, roof framing) — requires general contractor license and permits
• Gas line installation or repair — requires appropriate trade license and permits
• Any work requiring a building permit in O'Fallon or St. Charles County — verify permit requirements with the county Building & Code Enforcement Division

Business License — O'Fallon

Required. City of O'Fallon Business License

Setting Up Your Business in MO

To get paid professionally and protect yourself, register your business. LLC filing fee in MO: $50 (one-time). You'll also need a free EIN from the IRS and a business checking account.

Your Next Steps to Operating Legally in O'Fallon

1. Step 1: Determine your business structure (sole proprietor, LLC, or partnership). If forming an LLC, file with the Missouri Secretary of State ($50 filing fee). Register a Fictitious Name with the Secretary of State if operating under a business name ($7 fee, optional for sole proprietors using their legal name).
2. Step 2: Obtain a Missouri Sales Tax Permit from the Department of Revenue (free) if you provide taxable services or materials.
3. Step 3: Apply for a City of O'Fallon Business License through the Finance Department ($50 annual fee for home-based service businesses). Contact: (636) 240-2000 or https://www.ofallon.mo.us.
4. Step 4: If you plan to perform electrical, plumbing, or HVAC work, apply for the appropriate St. Charles County trade license(s) through the Building & Code Enforcement Division. Contact: (636) 949-7345 or https://www.sccmo.org/1544/Contractor-Licensing-and-Renewals. Obtain current fee schedules and application requirements.
5. Step 5: Obtain general liability insurance (recommended minimum $500,000–$1,000,000 coverage). Required if you hold any St. Charles County trade licenses.
6. Step 6: For any electrical work across multiple counties, apply for the Missouri Statewide Electrical Contractor License through MOPRO (https://mopro.mo.gov, $200 application fee). Verify with St. Charles County whether the county license satisfies the statewide requirement for in-county work only.
7. Step 7: Before starting any job, contact St. Charles County Building & Code Enforcement to determine whether a permit is required. Do not assume that exempt work does not require a permit.
8. Step 8: Verify with O'Fallon Planning & Zoning whether you need a home occupation permit if operating from a residence.

Licensing rules and fees change over time, so this information may be out of date. Verify all requirements with your local licensing authority before making business decisions.