InstaBidsHow much will solar panels cost in Marin County?
$28,924 was the median declared permit value for data years 2023-2026 in Marin County, CA. Residential solar permits on existing homes issued in Marin County declared a typical range (middle half of 1,668 Marin County, CA permit data points, Marin County, CA, 2023-2026) of $18,032 to $44,955.
Updated 2026-10-28
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| What was measured | Median declared value | Declared value range (middle half) |
|---|---|---|
| Residential solar permits on existing homes issued in Marin County declared | a median declared value on building permits of $28,924 | the typical range (middle half of 1,668 Marin County, CA permit data points, Marin County, CA, 2023-2026) was $18,032 to $44,955 |
Declared permit values are what applicants reported to the county; final contract prices can differ.
How measured: residential single-job permits; declared values below the low-value floor for the same job removed (1 row). Source: County of Marin, CA, 'Building Permit' (mkbn-caye), data read 22 October 2026.
These figures are estimates from County of Marin, CA, 'Building Permit' (mkbn-caye), data years 2023-2026, read 22 October 2026, for Marin County, CA. They are not a quote, and they are not a promise of what any contractor on InstaBids will charge. Your price depends on your home, the materials and the contractor. Get written bids before you decide.
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What the job includes, the line items to ask for and how to compare bids: the national solar panel system cost guide.
How does Marin handle rooftop photovoltaic permit plans?
Example rule, Marin County minor improvement route: plan assessment location: “We review your plans at the job site.”
Source: Marin County Building and Safety permit process, read 9 November 2026.
Example rule, Marin County minor improvement route: permit delivery: “You receive your permit online up front.”
Source: Marin County Building and Safety permit process, read 9 November 2026.
Example rule, Marin County minor improvement route: eligible rooftop work: “Residential rooftop photovoltaic installations”
Source: Marin County Building and Safety permit process, read 9 November 2026.
Example rule, Marin County self-service permit explanation: timing of plan review: “do not require a plan review prior to issuance”
Source: Marin County online building permit portal, read 9 November 2026.
Example rule, Marin County minor improvement permit explanation: inspection reference documents: “plans are still required”
Source: Marin County online building permit portal, read 9 November 2026.
Example rule, Marin County minor improvement permit list: storage equipment: “Energy Storage System Installations”
Source: Marin County online building permit portal, read 9 November 2026.
What do Marin County solar permits declare?
Each Marin County figure above is a declared permit value: what the applicant told the permit office the solar job was worth when applying. It is not an invoice.
The count covers residential building permits on existing homes whose description names solar, PV or photovoltaic work. Solar water heating permits, and permits only to take panels off and put them back, are not part of the count.
Some permits were left out first: 30 for a new home or not on an existing home, 11 legalisation, as-built, revision, supplemental or renewal permits, one for demolition or removal only, and 113 that also named another job.
Of the 1,673 matched permits, 1,669 carried a declared value. One value fell below the fixed low-value floor for this job and was removed, which leaves the 1,668 permits behind the figures.
The Census American Housing Survey used on other cost pages has no solar item, so the low-value floor here is a fixed one rather than one taken from that survey.
Source: U.S. Census Bureau, AHS 2023 Value Labels Package, read 16 October 2026.
The Marin County figures come only from Marin County permit records. They are kept in their own file and never mixed with permit records from another place.
How does Marin County handle rooftop solar permit plans?
Marin County lists residential rooftop photovoltaic installations under its minor improvement permit process. Before preparing a solar permit application, check that the proposed work fits that category.
Source: Marin County, How to apply for a building permit, read 31 October 2026.
For minor improvements, Marin County says it reviews plans at the job site. Keep the solar layout available for that review rather than treating the online permit as a review of the drawings.
Source: Marin County, How to apply for a building permit, read 31 October 2026.
The county describes receiving the minor improvement permit online up front. Read the minor improvement instructions alongside the solar proposal so the plan-review step and permit step are clear.
Source: Marin County, How to apply for a building permit, read 31 October 2026.
How does Marin County compare with New York State program records (NYSERDA)?
Marin County sits below New York on the median, but the two come from different kinds of record. The New York State Energy Research and Development Authority publishes the project cost reported for each system in its programs, and the block below keeps only homes that bought their system rather than leasing it or signing a power purchase agreement.
Source: NYSERDA, Solar Electric Programs Reported by NYSERDA, read 16 October 2026.
| What was measured | Median | Typical range (middle half) |
|---|---|---|
| Home solar systems bought outright and completed under NYSERDA programs in New York State had | a median of $38,702 | the typical range (middle half of 12,001 NYSERDA program data points, New York State (NYSERDA program data), 2025-2026) was $28,520 to $51,000 |
| By system size | a median of $3.84 per watt | the typical range (middle half of 12,001 NYSERDA program data points, New York State (NYSERDA program data), 2025-2026) was $3.20 per watt to $5.09 per watt |
How measured: owned, completed home systems, untrimmed; project cost divided by system size in watts. Source: NYSERDA, Solar Electric Programs Reported by NYSERDA: Beginning 2000, data read 16 October 2026.
These figures are estimates from NYSERDA, Solar Electric Programs Reported by NYSERDA: Beginning 2000, data years 2025-2026, read 16 October 2026, for New York State (NYSERDA program data). They are not a quote, and they are not a promise of what any contractor on InstaBids will charge. Your price depends on your home, the materials and the contractor. Get written bids before you decide.
Full national guide: How much will solar panels cost?
A program figure is the project cost reported for an installed system in New York State, while a Marin County permit value is what an applicant wrote down before the work began. This page keeps them apart and never blends them into one number.
The New York block also has a per-watt row, which puts systems of different sizes on one scale. The Marin County block is by job only.
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Sources for the figures on this page
- County of Marin, CA, 'Building Permit' (mkbn-caye), https://data.marincounty.gov/d/mkbn-caye, read 22 October 2026. InstaBids computed medians and middle-half ranges.
- Contains information from Building Permit (County of Marin, CA), which is made available here under the Open Database License (ODbL). Method.
- NYSERDA, Solar Electric Programs Reported by NYSERDA: Beginning 2000, https://data.ny.gov/Energy-Environment/Solar-Electric-Programs-Reported-by-NYSERDA-Beginn/3x8r-34rs, read 16 October 2026. Used under the OPEN-NY Terms of Use; no endorsement by New York State or NYSERDA is implied.
- Marin County Building and Safety permit process, www.marincounty.gov/departments/cda/building-and-safety/how-apply-building-permit, read 9 November 2026.
- Marin County online building permit portal, cdaportal2.marincounty.org/MarinBuildingPermits/Home, read 9 November 2026.
- U.S. Census Bureau, AHS 2023 Value Labels Package, www2.census.gov/programs-surveys/ahs/2023/AHS 2023 Value Labels Package.zip, read 16 October 2026.