State building permit guide
Maryland building permits — complete guide (2026)
Maryland has strong statewide building code enforcement. Montgomery and Prince George's Counties (DC suburbs) have the most complex permitting systems. Baltimore City operates its own separate permit system.
Avg cost: $200–$800
Processing: 2–7 weeks
~28,000 permits/year
23 counties + Baltimore City counties
$200–$800Average permit cost
2–7 weeksProcessing time
~28,000Permits issued/year
Partial — improvingADU-friendly
Maryland has mandatory statewide building code enforcement in all jurisdictions. Montgomery County and Baltimore City have the most rigorous processes. Maryland's proximity to the Chesapeake Bay means many properties have Critical Area restrictions on construction near tidal waters — verify before designing your project.
Permit costs by type — Maryland
| Permit type | Fee range | Processing time | Notes |
|---|---|---|---|
| Electrical | $100–$275 | 1–5 days | Licensed master electrician required |
| Plumbing | $85–$250 | 1–5 days | Licensed master plumber required |
| HVAC / Mechanical | $100–$300 | 2–6 days | Heat pump adoption growing |
| Roofing | $125–$375 | 1–5 days | Full replacement permit required |
| New Construction | $700–$2,200 | 3–8 weeks | Montgomery County among most complex |
| Room Addition | $400–$1,200 | 2–7 weeks | Critical Area rules may apply near Bay |
| Deck / Patio | $150–$500 | 1–5 weeks | Frost depth 30 inches |
| ADU | $400–$1,000 | 2–6 weeks | Several counties have approved ADU allowances |
| Solar | $100–$300 | 1–5 days | Maryland solar incentive programs |
| Pool | $200–$600 | 2–5 weeks | Barrier fence required statewide |
How to get a building permit in Maryland
1
Find your county or city building department
Maryland's 23 counties and Baltimore City each have their own systems. Montgomery County (MCDPS), Prince George's County (DPIE), and Baltimore City (DHCD) have online portals.
2
Check Critical Area status
Properties within 1,000 feet of tidal waters, tidal wetlands, or the Chesapeake Bay and its tributaries are in the Critical Area. Additional permits and restrictions apply.
3
Licensed master tradespeople
Maryland requires master electricians and master plumbers to pull permits for their respective trades. Journeyman-only work is not sufficient for permit applications.
4
Submit application with plans
Structural projects require architectural plans. Maryland energy code compliance documentation is required for most projects.
5
Phase inspections
Maryland counties require inspections at each phase. Montgomery County inspections can be scheduled online.
Permit costs by county — top Maryland counties
Montgomery County
$250–$800
3–8 weeks
Prince George's County
$200–$650
2–6 weeks
Baltimore County County
$200–$650
2–6 weeks
Baltimore City County
$200–$700
2–7 weeks
Anne Arundel County
$175–$575
2–5 weeks
Howard County
$200–$650
2–5 weeks
Frequently asked questions — Maryland permits
What is Maryland's Critical Area and how does it affect permits?
The Chesapeake and Atlantic Coastal Bays Critical Area encompasses land within 1,000 feet of tidal water. Construction in this area faces strict limits on impervious surfaces, vegetation disturbance, and structure size. A Critical Area permit is required in addition to a building permit.
Does Maryland require a master electrician to pull permits?
Yes. Maryland requires a master electrician license to apply for electrical permits. A homeowner exemption exists for primary residence work in most counties.
What ADU policies exist in Maryland?
Maryland does not have a statewide ADU law, but several counties — including Montgomery, Howard, and Frederick — have adopted ADU-friendly ordinances. Prince George's County is more restrictive.
How does Baltimore City permitting differ from the counties?
Baltimore City operates its own permit system through the Department of Housing and Community Development, separate from Baltimore County. Baltimore City has unique local amendments and an online permit portal.
Data sources: US Census Bureau BPS 2024 · Maryland Maryland Department of Labor — Division of Labor and Industry · Shovels.ai permit aggregator