Fairfax vs DC Solar Permit Fees (2026)
Project-type-specific comparison of residential solar PV permit fees using official fee data from both DMV jurisdictions. Fairfax County waives the solar building permit fee per Virginia state policy ($0) but the required electrical sub-permit is full price - $385.56 all-in for a standard 8 kW / 200-amp system (verified Appendix Q FY2025). Washington DC bundles a complete residential solar permit under one Instant Permit at $36.30 for systems up to 15 kW (verified DOB schedule, captured April 25, 2026). The two jurisdictions take opposite paths to solar permitting, and the all-in cost gap is roughly 10x in DC's favor for any standard rooftop install. This page covers solar only; for all project types see the general DC vs Fairfax permit fee comparison.
For a standard 8 kW / 200-amp residential solar install, Fairfax County charges $385.56 all-in ($0 building permit waived + $378 electrical permit for 150-399 amperage + $7.56 Virginia 2% state levy). Washington DC charges $36.30 all-in for a single Instant Permit covering systems up to 15 kW ($33 + 10% Enhanced Fee). DC is cheaper by $349.26 - a 10.6x spread on the same install. Fairfax's BP fee waiver is real but small; the electrical sub-permit is where the cost sits. DC bundles everything under one filing. Both totals are permit costs only - not the panels, inverter, racking, contractor labor, utility interconnection, or rebates.
- The headline number: a standard residential solar permit is $36.30 in Washington DC versus $385.56 all-in in Fairfax County for an 8 kW / 200A system - DC saves $349.26 on the same install (a 10.6x cost ratio).
- Fairfax waives the solar building permit fee per a Virginia state policy ($0) but the required electrical sub-permit is not waived - it's tiered by service amperage at $341 (0-149A), $378 (150-399A), $429 (400-599A), $527 (600-799A), or $633 (800+A), plus Virginia's 2% state levy.
- DC bundles a complete residential solar permit under a single Instant Permit launched February 2026 - $33 + 10% Enhanced = $36.30 all-in, covering systems up to 15 kW. There is no separate electrical permit for an Instant Permit solar install.
- Fairfax's BP fee waiver is a local fee-schedule choice that mirrors a Virginia state preference for clean-energy installs - it is not a statewide statutory waiver, and the electrical permit is where every dollar of Fairfax's solar permit cost sits.
- DC has no state levy (federal district); the $36.30 is stated as the all-in Instant Permit rate. Systems above 15 kW fall out of the Instant Permit and file standard permits with itemized electrical line items.
- Both totals are permit costs only. They exclude the panels, inverter, racking, roof penetrations, contractor labor, utility interconnection paperwork, the federal residential clean-energy tax credit, and any state or utility rebate.
What Is Verified in This Comparison
Both jurisdictions' solar data on this page are verified from official sources. No fee amounts are estimated. The Fairfax schedule reflects FY2025 Appendix Q (effective July 1, 2024) with solar_panels.method = flat_rate and amount = $0.00 plus the electrical trade-permit tiered-by-amperage table. The DC schedule is a live page on dob.dc.gov captured April 25, 2026, which states the Instant Permit rate at $33 + 10% = $36.30.
| Data Point | Fairfax County | Washington DC |
|---|---|---|
| Fee schedule source |
Verified Appendix Q, LDS Fee Schedule, FY2025 (effective July 1, 2024) |
Verified DOB Building Permit Fee Schedule (live page, captured April 25, 2026) |
| Solar building permit fee |
Verified: $0 waived Appendix Q solar_panels line: amount $0.00, permit still required |
Verified: $36.30 bundled Instant Permit covers the entire residential solar permit up to 15 kW |
| Electrical sub-permit |
Verified: required, full price Tiered by service amperage: $341 / $378 / $429 / $527 / $633 |
N/A under Instant Permit Bundled in the $36.30 for systems up to 15 kW |
| State / federal-district levy |
Verified: 2% levy Virginia USBC state levy applies to the electrical permit (Code of Virginia 36-139) |
N/A No state levy; the 10% Enhanced Fee is included in $36.30 |
| Standard 8 kW / 200A all-in | Verified: $385.56 | Verified: $36.30 |
Note on schedule currency: The Fairfax Appendix Q data is FY2025 (effective July 1, 2024); an FY2026 schedule may follow around July 2026 - verify with LDS at (703) 222-0801. The DC DOB schedule is a live page without a stamped effective date; PermitPrice captured it April 25, 2026 and re-verifies quarterly - confirm with DOB at (202) 671-3500. The DC Instant Permit for residential solar launched February 2026; systems above 15 kW file standard permits with separately itemized electrical line items.
Solar Fee Structure Comparison
Head-to-head comparison of how each jurisdiction prices a residential solar PV permit. Fairfax waives the BP but bills the electrical sub-permit at full price; DC bundles the whole filing under one Instant Permit.
| Fee Component | Fairfax County | Washington DC |
|---|---|---|
| Solar building permit | $0 (waived per VA state policy) | Bundled in Instant Permit |
| Electrical permit method | Required, tiered by service amperage | Bundled (Instant Permit up to 15 kW) |
| 0-149 amp service | $341 electrical | $33 base + 10% = $36.30 |
| 150-399 amp service (standard) | $378 electrical | $33 base + 10% = $36.30 |
| 400-599 amp service | $429 electrical | $33 base + 10% = $36.30 |
| Add-on fee | 2% Virginia state levy on the electrical permit | None (10% Enhanced Fee included in $36.30) |
| Plan review fee | None on the electrical trade permit | None on an Instant Permit |
| Standard 8 kW / 200A all-in | $385.56 Verified | $36.30 Verified |
Scope note: Both totals are permit costs only. Fairfax's $0 BP + $378 electrical + $7.56 levy = $385.56 all-in assumes the standard 200-amp service tier (150-399A range). A home with a 100-amp service files in the 0-149A tier for $341 + $6.82 levy = $347.82 all-in. DC's $36.30 holds for any system up to 15 kW under the Instant Permit; larger systems file standard permits and itemize electrical. Neither figure includes the panels, inverter, racking, roof penetrations, contractor labor, utility interconnection paperwork, the federal residential clean-energy tax credit, or any state or utility rebate.
Three Solar Jobs, Two Jurisdictions: Line-by-Line
Each example aligns a common residential solar setup on both sides. DC is cheaper in all three; the gap closes only at larger system sizes that fall out of the DC Instant Permit.
Example 1: Standard 8 kW rooftop install on a 200A service
$0.00$378.00$378 × 2% =
$7.56$0 + $378 + $7.56 =
$385.56$33.00$33 × 10% =
$3.30None in the federal district =
$0.00$33 + $3.30 =
$36.30Result: DC is cheaper by $349.26. Fairfax's BP waiver does not offset the full-price electrical sub-permit; DC's Instant Permit bundles every line item for a standard residential install.
Example 2: Small 4 kW install on an existing 100A service
$0.00$341.00$341 × 2% =
$6.82$0 + $341 + $6.82 =
$347.82$33 + 10% =
$36.30None =
$0.00$36.30Result: DC is cheaper by $311.52. Fairfax's lowest amperage tier still costs nearly 10x what DC charges for the same install size.
Example 3: Large 18 kW install requiring a service upgrade to 400A
$0.00$429.00$429 × 2% =
$8.58$0 + $429 + $8.58 =
$437.58Standard permit + separately itemized electrical line items, total varies by system specifics. Falls back to the alteration tier on PV scope plus electrical service-meter line items ($39 first 200A + $16 each additional, or $52 / $24 in the 201-400A range). Verify with DOB before budgeting an above-15 kW system.
None =
$0.00Standard-permit path is jurisdiction-specific and depends on declared scope. Estimate only.
Result: For systems above 15 kW DC exits the Instant Permit and the standard-permit pricing depends on the declared scope and service-meter line items - a published like-for-like number is not on the DOB schedule. Most single-family residential solar installs fall well below 15 kW (8-12 kW is typical), where DC's $36.30 holds. Verify any above-15 kW system with DOB at (202) 671-3500.
Why Fairfax and DC Price Solar So Differently
The gap comes from two opposite design choices, not from one jurisdiction being expensive across the board.
Fairfax waives the BP but charges the electrical permit at full price. Appendix Q sets solar_panels.amount to $0.00 - a local fee-schedule choice that mirrors a Virginia state preference for clean-energy installs. But the required electrical sub-permit is the same one used for any residential electrical work: it's tiered by the home's service amperage at $341 (0-149A), $378 (150-399A), $429 (400-599A), $527 (600-799A), or $633 (800+A), plus the 2% Virginia state levy. So the BP waiver is real but small compared to the electrical line item, and the all-in solar permit cost is essentially the electrical permit cost.
DC bundles the whole filing under one Instant Permit. DOB's Instant Permit program launched February 2026 specifically to streamline routine residential scopes - small solar installs, in-kind window replacements, electrical heavy-ups, and similar. The solar Instant Permit covers systems up to 15 kW at a flat $33 + 10% Enhanced Fee = $36.30 all-in. There is no separate electrical permit, no plan review, no levy. A homeowner or contractor files one Instant Permit and the entire scope is permitted.
The practical takeaway: for any standard residential solar install (typically 6-12 kW), DC is roughly an order of magnitude cheaper on permit fees. Above 15 kW DC exits the Instant Permit and the standard-permit math gets jurisdiction-specific. For the full single-jurisdiction detail, see the Fairfax solar guide and the DC solar guide; for VA-wide context see the Virginia statewide solar guide.
Frequently Asked Questions
Solar Guides and Tools
Go deeper on either jurisdiction, see the VA-wide picture, or compare a related electrical permit.
Official Sources
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Appendix Q - LDS Fee Schedule (FY2025) - Fairfax County Effective July 1, 2024 - source for the solar_panels line ($0 building permit waived) and the electrical trade-permit tiered-by-amperage schedule ($341 / $378 / $429 / $527 / $633). Verified May 2026 Verified
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DOB Building Permit Fee Schedule - DC Department of Buildings Captured April 25, 2026 - source for the Instant Permit residential solar rate ($33 + 10% = $36.30, up to 15 kW) and the electrical service-meter line items used above 15 kW. Verified April 2026 Verified
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Code of Virginia Section 36-139 - USBC State Levy Authority Current - authorizing statute for the 2% state levy applied to the Fairfax electrical sub-permit