Missouri Construction Compliance Requirements

Everything general contractors need to know about lien law, prevailing wage, insurance, and OSHA compliance in Missouri.

Mechanics Lien Law

Missouri mechanics liens must be filed within 6 months of last furnishing under RSMo 429.010 et seq. No preliminary notice is required. Missouri has a Notice of Lien that must be served on the owner within 10 days of filing. Separate rules for residential projects.

Key Deadlines

6 months: Mechanics lien filing deadline from last furnishing

10 days: Notice of Lien service on owner after filing

2 years: Lien enforcement deadline

Prevailing Wage Requirements

Missouri requires prevailing wages on public works projects over $75,000 under RSMo 290.210-290.340. Department of Labor and Industrial Relations sets rates. Certified payroll required. Annual wage orders published by county.

Insurance Requirements

Workers compensation required for employers with 5+ employees (1+ in construction). Minimum $1M general liability typical. Missouri has a competitive private insurance market.

OSHA & Safety Compliance

Missouri follows federal OSHA standards. No state OSHA plan. Missouri Department of Labor provides OSHA on-site consultation services.

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Last reviewed: April 2026. This guide is for informational purposes only and does not constitute legal advice. Consult a qualified attorney for state-specific legal questions.