Maryland Window Replacement Permits & Contractor Licensing

Maryland has one of the strictest licensing regimes in the country. Every home-improvement contractor, regardless of project size, needs a Maryland Home Improvement Commission (MHIC) license.

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Jason Verdelli, Founder of WindowGuide
Written & reviewed by Jason Verdelli
Founder of WindowGuide · 20+ yrs in home remodeling consumer research · Editorial standards · Reviewed July 3, 2026

At-a-glance

  • Licensing body: Maryland Home Improvement Commission (MHIC)
  • License threshold: All contractors performing home-improvement / window work of any dollar amount must hold an MHIC license
  • Permit authority: County building department (county-level in MD, not city)
  • Typical fees: $100–$500 for a window replacement permit

MHIC license verification

The MHIC license is non-negotiable. Verify at dllr.state.md.us before signing. The license lookup shows expiration date, active/inactive status, and any disciplinary history.

Contractors are also required to carry a $50,000 Guaranty Fund contribution, which is a Maryland-specific consumer protection.

County-level permitting

Window replacement permits are pulled at the county building department (Anne Arundel, Baltimore County, Howard, Montgomery, Prince George's, etc.). Baltimore City has its own permit office.

Timeline: 5–20 business days depending on the county. Baltimore County and Howard County are usually faster; Prince George's and Montgomery run longer.

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Frequently asked questions

Is an MHIC license really required?+

Yes, for any home-improvement / window work of any dollar amount in Maryland. There's no small-project exemption.

Does my contractor need to pull the permit?+

Yes, and Maryland law puts the burden on the contractor, not the homeowner.

Deep-dive planning guides

Energy-Efficient Windows
How to read U-factor and SHGC, which glass packages actually cut bills in your climate, what ENERGY STAR certification requires, and honest per-opening cost ranges for efficient replacement windows.
Vinyl vs. Fiberglass Windows
A straight comparison of vinyl and fiberglass replacement windows: real per-opening cost, expected lifespan, color options, performance in heat and cold, and which one holds value at resale.
Double vs. Triple Pane
When triple-pane glass is worth the upcharge and when it isn't: U-factor differences, real energy savings, noise reduction, weight and hardware issues, and cost per opening.

Maryland-specific planning guides

Energy-Efficient Windows in Maryland
How to read U-factor and SHGC, which glass packages actually cut bills in your climate, what ENERGY STAR certification requires, and honest per-opening cost ranges for efficient replacement windows.
Vinyl vs. Fiberglass Windows in Maryland
A straight comparison of vinyl and fiberglass replacement windows: real per-opening cost, expected lifespan, color options, performance in heat and cold, and which one holds value at resale.
Double vs. Triple Pane in Maryland
When triple-pane glass is worth the upcharge and when it isn't: U-factor differences, real energy savings, noise reduction, weight and hardware issues, and cost per opening.
Window Replacement Timeline in Maryland
From measurement to final caulk: how long window replacement really takes, why the wait is manufacturing lead time rather than install time, and what happens on install day.
Questions to Ask a Window Installer in Maryland
The questions that separate a real window contractor from a high-pressure sales operation: licensing, crew vs. subcontractor, warranty terms, deposits, and what belongs in the written quote.

Permits in other states

Pennsylvania Permits & Licensing
All contractors performing home-improvement / window work over $5,000/year must register (HIC number)
Virginia Permits & Licensing
Class C license required for projects $1,000–$10,000; Class B $10,000–$120,000; Class A over $120,000
North Carolina Permits & Licensing
General Contractor license required for projects over $30,000
South Carolina Permits & Licensing
Residential builder license required for projects over $5,000; specialty license under that
Georgia Permits & Licensing
Residential Basic Contractor license for projects up to $500,000; Residential Light Commercial over that
Florida Permits & Licensing
Certified Residential Contractor (CRC) or Certified General Contractor (CGC) required for all residential window projects
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See your personalized remodel plan in 2 minutes

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