How much does a solar permit cost?

Solar permit costs range from $50 in rural Texas to $1,500 in San Francisco. The national average for residential solar building permits is $200–400, with plan review fees adding another $100–200. Additional costs include the electrical permit ($75–150), utility interconnection fee ($25–200), and inspection fee ($75–150). Total soft costs typically run $0.10–0.30 per watt of installed capacity.

Does rapid shutdown add to permit cost?

Rapid shutdown itself doesn't usually add a separate permit fee, but it does affect plan review complexity and equipment costs. NEC 2020 requires module-level rapid shutdown for all new rooftop residential systems. The equipment (either microinverters like Enphase, or a dedicated RSD device) typically adds $200–600 to system cost. Plan check review may take slightly longer for NEC 2020-compliant designs.

Are solar permit fees included in the federal tax credit?

Yes — permit fees paid as part of your solar installation qualify as installation costs for the 30% federal Investment Tax Credit (ITC). If your total system cost including permit fees is $28,000, your ITC is $8,400. Keep all receipts including permit and interconnection application fees. The IRS has confirmed installation costs including permitting are eligible expenses under IRC Section 48(a).

Solar Permit Cost Calculator

Estimate solar permit fees by state — building permit, plan review, electrical permit, and interconnect. SF charges $1,500; Texas rural under $100.

Project details

State?

System size?

Mount type?

Interconnection type?

Rapid shutdown required (NEC 2020)?

YES — NEC 2020+ required

Total permit & soft cost estimate

$1,770

Building permit fee$850

Plan review fee$425

Electrical permit$150

Interconnect fee$145

Inspection fee$150

Soft cost per watt$0.177/W

Permit burden ratingAverage

AHJ note (California): Varies wildly — SF $1,500, LA $200, Sacramento $150. AB 968 caps at $450 for <10kW in many AHJs.

Permit range for your state: $200–$1,500. Always confirm with your specific AHJ (Authority Having Jurisdiction) — city and county fees vary significantly from state averages.

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How to Use This Calculator

Select your state and system details

Choose your state — permit fees vary enormously from state to state and even between cities in the same state. San Francisco charges up to $1,500 for a solar permit while rural Texas may charge $50. Enter your system size in kilowatts, as many jurisdictions have tiered permit fees that increase at certain thresholds (commonly 10 kW, 25 kW, and 100 kW). Select roof or ground mount — ground mounts often require a separate grading or structural permit.

Select interconnection type and rapid shutdown

Net metering and VNEM both require a utility interconnect application and fee ($0–500 depending on utility). Off-grid systems skip the interconnect step entirely. Toggle rapid shutdown compliance — NEC 2020 requires module-level rapid shutdown for all new rooftop residential systems. Most US jurisdictions have adopted NEC 2020 or later. This adds cost to equipment and plan check review, but typically not to the permit fee itself.

Read the cost breakdown

The calculator shows each fee component — building permit, plan review, electrical permit, interconnect, and inspection — plus the total soft cost per watt. Compare your result to the national residential average of $0.10–0.30/W permit burden. The AHJ note provides context on your state's permit environment and variability.

The Formula

Total Soft Cost = Building Permit + Plan Review + Electrical Permit + Interconnect + Inspection Building Permit = state-specific midpoint of AHJ range Plan Review = 50% of permit fee (typical) Electrical Permit = $150 (CA/NY/IL/NJ/MA/PA/MD) or $75 (other states) Interconnect Fee = $0 (off-grid) or state utility average Inspection Fee = state average Soft Cost $/W = Total Soft Cost ÷ (System kW × 1,000) Rating: Low <$0.12/W / Average $0.12–0.22/W / High >$0.22/W

Permit fees are one of the most opaque cost components in solar installations. The figures used here are derived from NREL's "Permitting and Interconnection Benchmarking" study, SEIA state permitting surveys, and direct AHJ data. The electrical permit is often a separate line item in states where solar is considered electrical work rather than building work — California, New York, Illinois, Massachusetts, and New Jersey commonly require both.

Example

Comparing SF Bay Area vs Texas Rural — same 10 kW system

San Francisco, CA — 10 kW rooftop

Building permit~$850 (SF midpoint)

Plan review (50%)$425

Electrical permit$150

PG&E interconnect$145

Inspection$150

Total soft cost~$1,720

$/W$0.172/W — Average

Rural Texas — 10 kW rooftop

Building permit~$125 (TX midpoint)

Plan review$63

Electrical permit$75

Interconnect$25

Inspection$75

Total soft cost~$363

$/W$0.036/W — Low

The same 10 kW solar system costs nearly 5× more to permit in the SF Bay Area vs rural Texas — a $1,357 difference in pure permit/soft costs. This is a meaningful factor in solar economics for high-permit states. Cities with simplified solar permitting (Tucson AZ, Orlando FL, Sacramento CA) have driven down soft costs significantly through online applications and automated plan review.

FAQ

What permits are required for residential solar installation? ▼

Most residential solar installations require three types of permits: (1) Building permit — for structural work (mounting hardware on the roof). (2) Electrical permit — for all electrical work (inverter, conduit, service entrance changes). In many jurisdictions these are combined into a single solar permit. (3) Utility interconnection application — filed with your electric utility, not the city, to authorize your system to connect to the grid. Some states (NY, CA, IL) require separate electrical permits under their specific codes. Your installer handles all three — but you pay for them.

Why is the San Francisco solar permit so expensive? ▼

San Francisco's solar permit can reach $1,500 because the city charges permit fees based on project valuation (a percentage of the total system cost), not a flat fee. A $28,000 solar system triggers fees based on the City's building permit fee schedule, which scales with project value. SF also requires full plan review, electrical permit, and DBI inspection — each with separate fees. In contrast, many jurisdictions have adopted flat-fee solar permits ($100–500) to incentivize adoption. California's AB 968 (2015) capped residential solar permits at $450 for systems under 10 kW, but SF has argued exemptions that allow higher fees in some cases.

What is rapid shutdown and does my system need it? ▼

Rapid shutdown is a safety feature required by NEC 2017 and expanded in NEC 2020, designed to allow firefighters to quickly de-energize solar panels on a roof to reduce electrocution risk. NEC 2020 requires module-level rapid shutdown for all rooftop residential systems — meaning each panel can be individually shut off. This requires either module-level power electronics (Enphase microinverters already comply) or a separate rapid shutdown device (typically adds $200–600 to system cost). Most US jurisdictions have adopted NEC 2020 or 2023. Ground-mount systems are exempt from the rooftop rapid shutdown rule. Check with your AHJ for the specific NEC edition your jurisdiction has adopted.

How long does the solar permitting process take? ▼

Permitting timelines vary from 1 day to 6 months depending on your AHJ. Progressive cities with online solar permitting (Tucson, Sacramento, Denver) can issue permits in 1–3 days. Most suburban municipalities take 1–4 weeks. NYC (through DOB) typically takes 2–6 months due to manual review requirements. Utility interconnection is separate — CPUC-regulated California utilities must respond within 20 days for residential; other states average 4–8 weeks for residential approval. The permit timeline calculator at solarsizecalculator.com estimates total project timeline from permit application to PTO (Permission to Operate).

Does the permit fee affect my solar tax credit? ▼

Yes — permit fees paid as part of your solar installation are included in the qualified solar system cost for purposes of the 30% federal Investment Tax Credit (ITC). If your total system cost including permit fees is $28,000, your ITC is $8,400 (30% of $28,000). The IRS has confirmed that "installation costs" including permitting are eligible expenses under IRC Section 48(a). Keep all receipts, including the permit and interconnection application fees. Consult a tax professional for your specific situation.

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