Michigan climate, wind & energy-code drivers
- ENERGY STAR climate zone: Northern — coldest climates, U-factor priority (U ≤ 0.27 in coldest tier)
- IECC climate zone: 5A-6A
- Maximum U-factor: 0.3 (IECC 2021 + state amendments)
- Maximum SHGC: No limit (cold climate)
- ASCE 7-22 design wind speed: 105 mph (Risk Category II)
- Hurricane impact-rated requirement: No statewide impact-rated requirement
- Dominant residential frame material: Vinyl frame — dominant in most climates, lowest cost-per-window
- Historic-preservation overlay prevalence: Moderate — selected metro historic districts with review
- EPA RRP lead-safe trigger (pre-1978 housing share): Very high — 60%+ pre-1978 housing share, mandatory EPA RRP lead-safe certification on every replacement
Michigan licensing, lead-safe & permits
- License status: Statewide license required
- License board: Michigan Department of Licensing & Regulatory Affairs (LARA) — Residential Builder License + Maintenance & Alteration Contractor (official site)
- Permit: city or county building permit required for window opening modification; LARA Residential Builder license required for new-construction; LARA Maintenance & Alteration Contractor license required for replacement work; replacement-only same-size installs typically permit-exempt; Detroit Lead Safe Renovation Ordinance separately enforces RRP-equivalent on every Detroit residential window replacement
How window replacement costs vary in Michigan
State-specific code or insurance rule: Michigan Construction Code Act of 1972 (PA 230) requires every Michigan window contractor to hold a LARA Residential Builder License plus complete a 60-hour Builder Pre-Licensure education program — making Michigan one of the most education-intensive residential builder licensing schemes in the country, plus Michigan Maintenance & Alteration Contractor License (MAC) separately covers replacement-only window work, and Detroit Lead Safe Renovation Ordinance (Detroit City Code §9-1-301) separately enforces RRP-equivalent lead-safe-certification mandate on every Detroit residential window replacement in pre-1978 housing — one of the most aggressive municipal lead-safe enforcement programs in the country with very-high pre-1978 housing share statewide.
Cities in Michigan
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