Independent Educational Guide: California residential solar permit facts, sourced, dated, and confidence-scored. Not legal, engineering, or permit advice.

Napa Solar Permit Guide

Pacific Gas & Electric (PG&E) territory · Napa County

Napa Solar Permit Checklist
Printed from mygridpermit.com/california/napa/solar-permit-guide/ · Last verified 2026-08-08 · City of Napa Building Division / PG&E · Verify current requirements before relying on this checklist. Programs and fees change.
✓ Last verified 2026-08-083 official sources
Informational only. This page is not legal, engineering, or permit advice. Every fact below links to the official source it came from and shows how confident we are in it. Verify current requirements with City of Napa Building Division and PG&E before making a decision.

Overview

GridPermit collects California residential solar and permitting facts directly from official sources (city, county, and state government sites, utilities, and public utilities commissions) and shows only what we can verify, with a confidence score and a link to where it came from. Nothing here is estimated or inferred beyond what's stated below. See our methodology for the rules this page follows.

Permit timeline

3 days

Search-engine synthesis indicates typical approval time is 3 business days, with more complex projects requiring structural review or variances taking longer; not independently confirmed via direct fetch of the Solar PV page's own timeline statement.

Confidence: Medium (0.55)

Source(s): Solar PV

Battery/solar incentive program on record

No battery/storage incentive program is on record for this locality.

Permit fees

Not yet verified.

Rebates

Not yet verified.

Utility and generation supplier

Utility

Pacific Gas & Electric (PG&E)

Confidence: High (0.9)

Source(s): Solar PV

Generation supplier

MCE (Marin Clean Energy) (Community Choice Aggregator)

MCE's own service-area page confirms Napa as one of 6 Napa County communities it serves (alongside American Canyon, Calistoga, St. Helena, Yountville, and unincorporated Napa County). PG&E continues to deliver the power and provide billing/customer service.

Confidence: High (0.85)

Source(s): Service Area

Interconnection

https://www.pge.com/en/save-energy-and-money/rebates-and-incentives/nem.html

PG&E's own utility-wide Net Energy Metering (NEM) program page.

Confidence: Medium (0.55)

Permit authority

City of Napa Building Division

Confidence: High (0.9)

Source(s): Solar PV

Permit page: https://www.cityofnapa.org/1037/Solar-PV

Required documents

  • Building permit application (one per project) (required when: always)
  • Two full sets of plans (title page, site plan, structural calculations, single-line electrical, attachment details) (required when: always)
  • Footing details (ground-mounted systems) (required when: conditional)
  • Equipment cut sheets (required when: always)
  • Signed homeowner contract (required when: always)
  • Active City of Napa Business License (contractor) (required when: always)

Confidence: High (0.9)

Source(s): Solar PV

Inspection steps

  • Call the automated inspection line at 707-257-1063

Confidence: Medium (0.7)

Source(s): Solar PV

Eligibility constraints

  • Property types: residential
  • Max system size (AC): Not yet verified.
  • Max system size (DC): Not yet verified.
  • Max thermal capacity: Not yet verified.
  • Program/pathway: Over-the-counter residential Solar & Battery Backup permitting
  • Other conditions:
    • Processed over-the-counter during walk-in hours, Monday-Thursday 8:30am-3:30pm
    • Project must be located within city limits
    • The city does not have an online portal for submittals

Confidence: High (0.85)

Source(s): Solar PV

Official contacts

Confidence: High (0.85)

Need a solar installer who handles permits in Napa?

EnergySage is an independent solar marketplace where you can request property-specific pricing from installers familiar with local permitting.

Compare quotes from solar installers →

You'll continue on EnergySage's website. GridPermit has a partner relationship with EnergySage; this link is not currently tracked, and whether the partnership results in compensation to GridPermit has not yet been confirmed.

Sources

Frequently Asked Questions

What utility serves solar customers in Napa, California?

Pacific Gas & Electric (PG&E) is the interconnection and distribution utility for Napa. The default electricity generation supplier is MCE (Marin Clean Energy), a Community Choice Aggregator (CCA), separate from Pacific Gas & Electric (PG&E).

How long does a residential solar permit take in Napa?

Search-engine synthesis indicates typical approval time is 3 business days, with more complex projects requiring structural review or variances taking longer; not independently confirmed via direct fetch of the Solar PV page's own timeline statement.

What documents are required for a solar permit in Napa?

Commonly required documents include: Building permit application (one per project); Two full sets of plans (title page, site plan, structural calculations, single-line electrical, attachment details); Footing details (ground-mounted systems); Equipment cut sheets; Signed homeowner contract; Active City of Napa Business License (contractor).

Who do I contact about solar permits in Napa?

City of Napa Building Division, Plans Examiner, phone 707-257-9540, email buildingdivision@cityofnapa.org.

Disclaimers: This page is for informational purposes only and is not legal, engineering, financial, tax, or permit advice. GridPermit is not a solar installer, contractor, engineering firm, public utility, or government agency. Requirements, fees, and program terms change. Verify current requirements with City of Napa Building Division and PG&E before starting a project. Last verified 2026-08-08.

All California Guides · Methodology · How It Works · Back to GridPermit