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Fairfax Solar Permit Cost (2026)

Residential solar (PV) permit fees in Fairfax County, Virginia, pulled directly from the official Appendix Q Land Development Services Fee Schedule (FY2025, effective July 1, 2024). The solar building permit fee is listed as $0 (waived) in Fairfax County's Appendix Q fee schedule - but a permit is still required and must be pulled before installation. Permit fees in Virginia are set locally, so this $0 waiver is specific to Fairfax and is not a statewide rule. The real cost is the separate electrical permit required for the PV interconnection, which is not waived. Fairfax bills the electrical permit by the home's electrical service amperage: $341 for 0-149A, $378 for the standard 150-399A tier, up to $633 for 800A+, with Virginia's 2% state levy on top. A typical 8 kW rooftop system on a 200-amp service totals $385.56 all-in. Verify your current solar and electrical permit fees with Fairfax Land Development Services at (703) 222-0801.

Solar Building Permit Fee
$0 (waived)
Permit Still Required?
Yes - pull before install
Electrical Permit (200-amp service)
$378.00
Virginia 2% State Levy
Applies to electrical permit
Typical 8 kW System All-In
$385.56
Fee Status
Official Appendix Q FY2025
What This Guide Covers - and What It Does Not

This guide covers: Fairfax County, Virginia residential solar (PV) permit fees as published in Appendix Q (FY2025, effective July 1, 2024). Coverage includes the $0 (waived) solar building permit fee, the requirement to still pull a building permit before installation, the separate electrical permit required for the PV interconnection, the amperage-tiered electrical permit rates ($341 for 0-149A through $633 for 800A+), and Virginia's 2% state levy on the electrical permit.

This guide does NOT cover: Solar panel equipment, inverters, racking, or installation labor costs. Dominion Energy interconnection and utility fees (separate filing with the utility). Structural engineering or designer fees - an engineer's letter for added roof dead load is the designer's professional fee, billed separately. HOA architectural approvals. Federal or state solar tax credits and incentives.

When a Fairfax solar permit is required: A permit is required for every residential solar PV installation, even though the building permit fee is $0. The permit must be pulled before installation begins. A separate electrical permit is also required and is not waived. Verify your project's permit path with Fairfax LDS at (703) 222-0801 before assuming any exemption.

Note on the electrical permit tier: The electrical permit is tiered by the home's electrical service amperage, not by system size in kW. A standard residential 200-amp service falls in the 150-399A tier ($378). A system that forces a service upgrade (for example, to 400A) moves the electrical permit into a higher tier.

Key Takeaways
  • Fairfax's Appendix Q fee schedule waives the solar building permit fee ($0), but a permit is still required and must be pulled before installation. This $0 is a Fairfax fee-schedule choice, not a statewide Virginia rule. Skipping the permit risks stop-work orders and failed inspections.
  • The separate electrical permit is NOT waived - $378 for a standard 200-amp service plus the 2% Virginia levy = $385.56. This is the real cost of permitting a Fairfax solar install.
  • Verified reference: an 8 kW, 20-panel rooftop system on a 200-amp service. Building permit $0; electrical permit $378 + $7.56 levy = $385.56 all-in.
  • The electrical permit is tiered by service amperage: $341 (0-149A), $378 (150-399A), $429 (400-599A), $527 (600-799A), up to $633 (800A+), with a $135 minimum. A system that forces a service upgrade moves up a tier.
  • Permit fees are county charges only - they exclude solar equipment, installation labor, and Dominion Energy interconnection/utility fees, which are billed separately.
  • Added roof dead load may require structural review (handled within the $0 building permit) or an engineer's letter, which is the designer's professional fee billed separately from the county permit.
  • Source: Appendix Q FY2025 from fairfaxcounty.gov, verified May 2026. Always verify current solar and electrical permit rates with Fairfax LDS at (703) 222-0801 before filing.
Calculate Your Solar Permit All Fairfax Permit Fees

Fairfax Solar Permit Fee Components

A Fairfax residential solar permit is built from three lines for the typical 8 kW / 200-amp example: the $0 (waived) solar building permit fee, the required electrical permit for the PV interconnection ($378 in the standard 150-399A amperage tier), and Virginia's 2% state levy applied to the electrical permit. The building permit fee is $0, so the entire cost is the electrical permit.

Component Amount (8 kW / 200-amp example) How It Is Calculated
Solar building permit fee $0.00 Listed as $0 (waived) in Fairfax's Appendix Q fee schedule; permit still required and must be pulled before installation.
Electrical permit (150-399A tier) $378.00 Required for the PV interconnection; not waived. Standard residential 200-amp service falls in this tier.
2% Virginia state levy $7.56 2% of the $378 electrical permit. Statutory under Code of Virginia §36-139.
All-in 8 kW solar system total $385.56 $0 building permit + $378 electrical permit + $7.56 levy.

Source: Fairfax County Appendix Q Land Development Services Fee Schedule, FY2025, effective July 1, 2024 - solar_panels building permit line ($0, waived) and the electrical trade permit amperage tiers, plus Virginia §36-139 state levy at 2% of the electrical permit. Verified May 2026.

Worked Examples - Real Solar Projects in Fairfax County

Each example uses the same Fairfax fee schedule. The building permit fee is $0 in all cases - the cost is entirely the electrical permit, and the amperage tier is set by the home's electrical service size, not by the system's kW rating.

Example 1: Typical 8 kW rooftop system, 200-amp service (verified reference example)

A homeowner installs an 8 kW, 20-panel rooftop solar PV system on a standard residential 200-amp electrical service. A permit is required even though the building permit fee is waived. This is the verified reference example for a permitted Fairfax solar install.

  • Solar building permit fee: $0.00 (waived; permit still required)
  • Electrical permit (150-399A tier): $378.00
  • 2% Virginia state levy on the $378 electrical permit: $7.56
  • Total all-in solar permit: $385.56
Example 2: Small 4 kW system on an existing 100-amp service (no service upgrade)

A homeowner installs a small 4 kW PV system on an existing 100-amp electrical service that does not need upgrading. The building permit fee is still $0, and the electrical permit falls in the 0-149A tier. The figures below are arithmetic from the verified 0-149A tier rate.

  • Solar building permit fee: $0.00 (waived; permit still required)
  • Electrical permit (0-149A tier): $341.00
  • 2% Virginia state levy on the $341 electrical permit: $6.82
  • Total all-in solar permit: $347.82

Arithmetic from the verified 0-149A tier rate ($341) plus the 2% levy ($341 x 2% = $6.82). The electrical permit tier is set by the home's service amperage, not the system size.

Example 3: Large 12 kW system that requires a 400-amp service upgrade

A homeowner installs a large 12 kW PV system that forces a service upgrade to 400 amps. The building permit fee is still $0, and the electrical permit moves up into the 400-599A tier. The service upgrade is itself the electrical permit. The figures below are arithmetic from the verified 400-599A tier rate.

  • Solar building permit fee: $0.00 (waived; permit still required)
  • Electrical permit (400-599A tier): $429.00
  • 2% Virginia state levy on the $429 electrical permit: $8.58
  • Total all-in solar permit: $437.58

Arithmetic from the verified 400-599A tier rate ($429) plus the 2% levy ($429 x 2% = $8.58). The service upgrade is the electrical permit; a system that forces a higher amperage moves up a tier.

Calculate Your Fairfax Solar Permit

The PermitPrice fee calculator handles the Fairfax solar permit path: the $0 waived building permit plus the amperage-tiered electrical permit and Virginia's 2% state levy. Pick your home's electrical service amperage and the calculator returns the all-in permit cost broken down by component.

Calculator coverage for Fairfax solar: $0 (waived) building permit, amperage-tiered electrical permit ($341 for 0-149A through $633 for 800A+), and the 2% Virginia state levy. Select your service amperage and the all-in total is returned with a per-component breakdown.

Open the Permit Fee Calculator

Solar Permit Cost: Fairfax vs Washington DC

Fairfax and Washington DC use completely different fee models for residential solar, so these figures are not apples-to-apples. Fairfax waives the building permit but charges the mandatory electrical permit (the real cost). DC bundles a small-system residential install into a low flat Instant Permit fee.

Jurisdiction Solar Permit Formula / Rule All-In Permit Cost
Fairfax County Building permit $0 (waived) + electrical permit ($378 + 2% levy) $385.56 (typical 8 kW / 200A)
Washington DC Instant Permit flat $33 + 10% DOB Enhanced Fee $36.30 (residential up to 15 kW)

Fairfax's $0 building permit excludes the mandatory separate electrical permit (the real cost); DC's $36.30 Instant Permit covers the small-system residential scope. These are different fee models and are not directly comparable line-for-line. See the dedicated Fairfax vs DC solar permit fee comparison for a line-by-line breakdown of both fee paths, and for the statewide picture see the Virginia Solar Permit Cost Guide.

Related Fairfax Permits

A solar install that forces a service upgrade is permitted as an electrical panel upgrade. See the related guides for the full picture.

Frequently Asked Questions

A Fairfax County solar permit costs $0 for the building permit (listed as $0 in Fairfax's Appendix Q fee schedule) plus about $385.56 for the required electrical permit on a typical 8 kW system on a 200-amp service: $378 electrical permit + $7.56 state levy. A permit is still required even though the building fee is $0, and it must be pulled before installation.
The building permit FEE is waived ($0), but a permit is still required and must be pulled before installation. The separate electrical permit needed for the PV interconnection is not waived - it runs about $385.56 all-in for a typical 8 kW system on a 200-amp service. So solar permitting is not truly free; the electrical permit is the real cost.
A solar PV system interconnects to your home's electrical service, so Fairfax requires an electrical permit for the wiring, inverter, and interconnection work. The electrical permit is tiered by the home's electrical service amperage, ranging from $341 for a 0-149A service up to $633 for an 800A+ service, plus Virginia's 2% state levy.
Yes. The solar building permit must be pulled before installation even though the building fee is waived to $0. Installing without a permit risks stop-work orders and failed inspections, and can complicate your home sale or insurance later. The $0 fee waiver does not remove the permit requirement itself.
No. Permit fees are county charges only. The $0 building permit and the electrical permit do not include the cost of solar panels, the inverter, racking, or installation labor. Dominion Energy interconnection and utility fees are also separate. The permit fee is a small line item in the overall solar project budget.
A service upgrade moves the electrical permit into a higher amperage tier. For example, a 400-amp upgrade falls in the 400-599A tier at $429, which totals $437.58 with the 2% levy. The service upgrade is itself the electrical permit. See the Fairfax electrical panel permit guide for the full upgrade fee breakdown.
Possibly. The added dead load of panels and racking may require structural review, which is handled within the $0 building permit, or an engineer's letter confirming the roof can carry the load. The engineer's letter is the designer's professional fee and is billed separately from the county permit. Verify whether your roof triggers this with Fairfax LDS at (703) 222-0801.
Washington DC uses a flat $36.30 Instant Permit (a $33 base plus a 10% DOB Enhanced Fee) for residential solar up to 15 kW. Fairfax waives the building fee but charges the required electrical permit, which is about $385.56 for a typical 8 kW system on a 200-amp service. These are different fee models, so they are not directly comparable line-for-line.

Sources

Official .gov Sources - Verified May 2026
Next Step

Calculate your specific Fairfax solar permit cost or compare against neighbors.

Always verify current solar and electrical permit fees directly with Fairfax County Land Development Services before budgeting or filing. The Appendix Q LDS Fee Schedule on fairfaxcounty.gov/landdevelopment is FY2025 and is the current published rate sheet as of May 2026, with an expected FY2026 revision around July 2026. Call (703) 222-0801 or use the PLUS portal at plus.fairfaxcounty.gov to confirm the $0 solar building permit waiver, the electrical permit amperage tier for your service, and any structural-review or engineer-letter requirement before submitting an application.
Disclaimer: All fee information on PermitPrice is for informational purposes only and is not an official permit quotation. Actual permit fees are determined by Fairfax County Land Development Services at the time of application. The solar building permit fee is waived to $0, but a permit is still required; the separate electrical permit is not waived. Whether a specific install needs additional structural review or an engineer's letter depends on roof and project scope. Verify directly with Fairfax LDS before filing.

Written by: Munib Ur Rehman

Data verified against official fee schedule documents.