🦀 Maryland

Home Battery Storage Permit Requirements in Maryland (2025)

Last updated: June 2025

Maryland Bottom Line: A permit is required in all Maryland jurisdictions. Maryland has a state building code but county administration. Typical fees: $200–$450. BGE serves the Baltimore metro; Pepco serves Montgomery and Prince George's counties. Both have residential interconnection processes (3–5 weeks).

How Maryland Battery Permits Work

Maryland uses the Maryland Building Performance Standards (MBPS) enforced by county governments. Maryland adopted the 2021 IBC and 2020 NEC. Every county requires permits for residential battery storage. Montgomery County, Prince George's County, Baltimore County, and Anne Arundel County all have established online permit systems.

The Permit Process

Montgomery County uses a streamlined online permit system with residential electrical permits typically reviewed in 7–10 days. Prince George's County runs 10–14 days. BGE serves the Baltimore area; Pepco serves the DC suburbs. Both have residential interconnection application processes for grid-tied storage taking 3–5 weeks.

Documents Required

Required: permit application, single-line diagram, UL 9540 spec sheets, Maryland licensed electrical contractor (DLLR Master Electrician license), site plan. Maryland requires Home Improvement Contractor license for contractors performing residential work valued over $100.

  1. Permit application — from your local building department
  2. Single-line electrical diagram
  3. Equipment spec sheets with UL 9540 listing
  4. Licensed contractor license number
  5. Site plan

FAQ — Maryland

In virtually all incorporated areas of Maryland, yes. Always verify with your specific local building department before proceeding without a permit.
Typical review times range from 5 to 21 business days depending on your city. Your installer can give a current estimate for your specific jurisdiction.
Most reputable installers handle permit filing as part of the installation package. Confirm this is included before signing and ask for the permit number once issued.
Informational only — not legal or electrical advice. Verify with your local building department.
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