Baltimore County Solar Permit Cost (2026)
Installing rooftop solar in Baltimore County, Maryland, needs a building permit, and the fee is pulled directly from the official Baltimore County Permits, Approvals and Inspections (PAI) building permit fee schedule. Baltimore County prices a residential solar power system (roof or ground mounted) as a flat $100, regardless of the system size or panel count, plus a separately listed $75 residential permit application fee. Maryland has no statewide percentage levy, so there is no Virginia-style 2% add-on. The electrical interconnection is a separate trade permit. Figures are from the PAI schedule effective July 1, 2026, re-verified November 4, 2026.
This guide covers: Baltimore County, Maryland residential solar power system building permit fees as published in the Baltimore County PAI building permit fee schedule. A residential solar power system (roof or ground mounted) is a flat $100 regardless of system size, plus a separately listed $75 residential permit application fee. This building permit covers the structural and rooftop side of the installation.
This guide does NOT cover: The electrical permit for the inverter, wiring, disconnect, and utility interconnection is filed separately on Baltimore County's electrical fee schedule and is not priced here. Commercial roof-mounted ($0.15/sq ft, minimum $480) and commercial ground-mounted ($0.010/sq ft, minimum $380) solar follow a different per-square-foot track and are outside the residential flat fee. Utility (BGE) interconnection and net-metering applications. HOA approvals. Contractor labor, equipment, and material costs.
Application fee treatment: The schedule lists a separate $75 residential permit application fee and does not say whether it is credited toward the permit fee, so PermitPrice shows totals both ways: with the $75 added on top, and $75 lower if PAI credits it toward the permit. PermitPrice will update this page once the county confirms. Figures are from the schedule effective July 1, 2026, re-verified November 4, 2026.
When a Baltimore County solar permit is required: Baltimore County lists a residential solar power system as a permitted item, so a building permit is generally required to install rooftop solar. Confirm whether your specific scope requires a permit, and which trade permits apply, with PAI before assuming an exemption.
A Baltimore County, MD residential solar building permit costs a flat $100, regardless of the system size or panel count, because the county prices a residential solar power system as a single flat fee. The schedule also lists a separate $75 residential permit application fee, so PermitPrice estimates $100 to $175 all-in ($175 if the $75 is charged on top, $100 if it is credited). Maryland adds no statewide percentage levy. The electrical interconnection (inverter, disconnect, utility tie-in) is a separate Baltimore County trade permit. These figures come from the PAI schedule effective July 1, 2026; the schedule does not say whether the $75 application fee is credited toward the permit.
- Baltimore County bills a residential solar power system at a flat $100 plus a $75 application fee - the system size in kilowatts and the panel count do not change the building permit fee.
- Maryland has no statewide percentage building-permit levy, so there is no 2% add-on like Virginia's USBC levy. The $100 fee plus the $75 application fee is the entire building permit charge for the structural side.
- The electrical interconnection is separate. The inverter, wiring, disconnect, and utility tie-in are filed on Baltimore County's electrical permit schedule and are not included in the $100.
- Commercial solar follows a different per-square-foot track ($0.15/sq ft roof-mounted with a $480 minimum; $0.010/sq ft ground-mounted with a $380 minimum) - the $100 residential flat fee covers residential roof and ground mounted systems only.
- At $100 flat ($100 to $175 depending on whether the $75 application fee is credited), Baltimore County sits between Carroll County's $60 and Montgomery County's $261.18 for a residential rooftop solar building permit.
- Baltimore County replaced its 2018 schedule (residential solar $79) with one effective July 1, 2026 (re-verified November 4, 2026). The schedule does not say whether the $75 application fee is credited toward the permit, so PermitPrice shows it as an additional line.
Baltimore County Solar Permit Fee Structure
Baltimore County uses a simple flat-fee structure for residential solar. There is no per-kilowatt tier and no percentage levy on the residential flat fee - the single $100 fee (plus the separately listed $75 application fee) is the whole building permit charge for the structural side. The electrical interconnection is billed separately. Commercial and ground-mounted systems use a different per-square-foot track shown for context.
| Item | Building Permit Fee | How It Is Calculated |
|---|---|---|
| Residential solar power system (any size) | $100.00 | Flat fee for roof or ground mounted residential systems. Applies regardless of system size or panel count. |
| Permit application fee (residential) | $75.00 | Listed separately on the schedule; not stated whether it is credited toward the permit fee, so shown as additional. |
| Electrical interconnection (inverter / disconnect / tie-in) | Separate | Filed on Baltimore County's electrical fee schedule - not priced here. |
| Commercial roof-mounted solar | $0.15/sq ft (min $480) | Per-square-foot track - not the residential flat fee. |
| Commercial ground-mounted solar | $0.010/sq ft (min $380) | Per-square-foot track - not the residential flat fee. |
| State / local percentage levy | None | Maryland has no statewide USBC-style percentage levy. No 2% add-on. |
Source: Baltimore County Building Permit Fee Schedule (PAI BPP 15 Attachment A, Rev 6/30/26), effective July 1, 2026: residential solar power system (roof and ground mounted) $100.00; residential permit application fee $75.00. Re-verified November 4, 2026. The electrical interconnection is billed separately on Baltimore County's electrical schedule.
Worked Examples - Real Solar Projects in Baltimore County
Each example uses the same flat $100 fee for the residential building permit, plus the separately listed $75 application fee. Because Baltimore County prices residential solar as a flat fee, the building permit cost does not change with system size - it is $175.00 either way with the application fee on top, or $100.00 if the application fee is credited. The electrical interconnection is separate and not priced here.
A homeowner installs a 6 kW rooftop array (about 16 panels) on a single-family home in Towson.
- Residential solar power system: flat building permit fee = $100.00
- Maryland percentage levy: $0.00 (none)
- Permit application fee (residential, listed separately): $75.00
- Building permit subtotal: $175.00 ($100.00 if the $75 application fee is credited toward the permit)
- Electrical interconnection permit: separate - not priced here
The system size is irrelevant to the building permit fee - a 4 kW and a 9 kW residential system both pay $100 for the building permit plus the $75 application fee.
A homeowner installs a larger 10 kW array plus a home battery. The residential solar building permit uses the flat fee, and the electrical work is a separate trade permit.
Building permit (structural / rooftop):
- Residential solar power system flat fee = $100.00
- Maryland percentage levy: $0.00 (none)
- Permit application fee (residential, listed separately): $75.00
- Building permit subtotal: $175.00 ($100.00 if the $75 application fee is credited toward the permit)
Trade permit (separate):
- Electrical permit for inverter, battery, disconnect, and utility interconnection - filed on the Baltimore County electrical schedule, not priced here
PermitPrice does not estimate the Baltimore County electrical-permit amount because it is set on a separate county schedule that is not part of the building permit fee data verified for this page.
A small commercial building installs a 2,000 sq ft roof-mounted array. Commercial solar is not the residential flat fee - it uses the per-square-foot track.
- Roof-mounted commercial rate: 2,000 sq ft × $0.15 = $300.00
- Minimum applies: $480.00 minimum governs → $480.00
- Permit application fee (commercial, listed separately): $100.00
- Commercial building permit: $580.00 ($480.00 if the $100 commercial application fee is credited toward the permit)
This example is shown only to illustrate the commercial track. Residential rooftop solar is the flat $100 and does not use the per-square-foot rate.
Baltimore County Solar Permit Cost vs Other Verified Jurisdictions
Baltimore County's $100 flat residential solar permit ($100 to $175 depending on whether the $75 application fee is credited) sits in the middle of the verified DMV range. The comparison below mixes fee bases - flat, per-square-foot waived, and bundled instant-permit - so read the basis column, not just the dollar figure. The electrical interconnection is excluded everywhere because it varies by scope.
| Jurisdiction | Residential Solar Fee Basis | Typical Building Permit |
|---|---|---|
| Baltimore County, MD | $100 flat + $75 application fee | $100.00-$175.00 |
| Carroll County, MD | $60 flat (category F) | $60.00 |
| Montgomery County, MD | $261.18 flat (rooftop) | $261.18 |
All three Maryland counties price residential rooftop solar as a flat building permit fee with no state levy, but the amounts differ - Carroll $60, Baltimore County $100 (plus a $75 application fee), Montgomery $261.18. For broader context, Washington, DC processes residential solar through an Instant Permit at about $36.30 all-in, and Fairfax County, VA waives the building permit dollar amount but still requires the electrical trade permit. The electrical interconnection is excluded from every figure here. Baltimore County figures are from its schedule effective July 1, 2026.
See how Baltimore County compares head-to-head against its Maryland neighbors.
Frequently Asked Questions
Sources
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Baltimore County Building Permit Fee Schedule (PAI BPP 15 Attachment A, Rev 6/30/26) Effective July 1, 2026 - Baltimore County, MD - Primary source for the residential solar permit fee ($100 flat; $75 residential application fee). Re-verified November 4, 2026
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Baltimore County Department of Permits, Approvals and Inspections (PAI) Accessed June 2026 - Baltimore County, MD - Official department page hosting the building permit and electrical fee schedules. Phone 410-887-3900
Confirm your specific Baltimore County solar permit cost or compare against neighbors.