This page publishes what Scout Data’s permit database shows for Honolulu County: 6,227 residential solar permits in 2025 and 12,106 over the 24 months from September 2024 through August 2026, on 11,775 distinct homes. The state picture is on solar permits in Hawaii, the national one on the U.S. solar permit statistics page; the methodology is at the bottom.
- 2025 permits
- 6,227
- Homes with solar
- —
- Median declared value
- $31,000
- Battery attach, 2025
- 90.7%
Residential solar permits in Honolulu County by year
Permits filed each full year since 2015, and the number of distinct homes behind them. A single project can carry more than one permit, so homes run below permits.
| Year | Residential solar permits | Homes |
|---|---|---|
| 2015 | 4,980 | 4,902 |
| 2016 | 3,976 | 3,785 |
| 2017 | 2,009 | 1,913 |
| 2018 | 1,975 | 1,923 |
| 2019 | 2,513 | 2,490 |
| 2020 | 3,702 | 3,679 |
| 2021 | 3,486 | 3,452 |
| 2022 | 4,381 | 4,332 |
| 2023 | 6,538 | 6,396 |
| 2024 | 5,973 | 5,862 |
| 2025 | 6,227 | 6,115 |
Tracked permitting in Honolulu County peaked in 2023 at 6,538 permits. 2025 came in at 6,227, down 5% from 2023. Early years understate activity more than recent ones, because jurisdiction coverage has grown over time; every figure is a floor on true activity.
How many Honolulu County homes already have solar
This page does not publish a rooftop adoption rate for Honolulu County. The permit counts above are the better measure of activity here.
Batteries on Honolulu County solar permits
Of 6,227 residential solar permits filed in Honolulu County in 2025, 5,649 record energy storage as part of the job, an attach rate of 90.7%. This is a floor: a permit whose description never mentions storage counts as having none. The national curve is on solar battery attachment rates.
The bankruptcy overhang in Honolulu County
No Honolulu County solar permit in our database was filed under an installer on the Scout Data bankrupt installer list before that company’s petition or closure date.
Selling to Honolulu County homes with a permit on file
What a permit record carries and who sells permit data is in solar permit data providers; teams that call rather than knock start from solar call center leads.
More of Hawaii
The state totals and the ten busiest counties are on solar permits in Hawaii.
Methodology
- Source. Scout Data’s production permit database joined to property records and to an aerial roof classification of single-family homes, matched on the county FIPS code.
- What is counted. Residential permits whose own text names a solar, photovoltaic or PV installation, one row per permit at its latest status. Commercial, agricultural and utility-scale projects are excluded, and so are permits with no usable issue date. Same cohort as the Hawaii page, derived later (October 5, 2026), so late-filed permits can make this county read slightly higher than its row in the state’s county table.
- Windows. The year table uses full permit issue years. Home counts, declared values and the share of the state cover September 2024 through August 2026.
- Valuations. Median declared valuation on permits carrying a non-zero value, computed exactly, and shown only where at least 200 permits carry one.
- Rooftop solar. The denominator is single-family homes whose roof has an aerial classification, and the share is published only where enough of the county’s single-family roofs are classified for it to hold.
- Batteries. A 2025 permit counts as recording storage when its text says so, excluding form boilerplate. Shown only where the county filed at least 1,000 permits in the year and its permit text records storage at all.
- Bankrupt installers. Homes with a permit whose installer name starts with a company name, or alias, on the bankrupt installer list, filed on or before that company’s petition or closure date where one is known.
- Coverage. Not every jurisdiction publishes permits and Scout Data does not ingest every one that does. All counts are floors on true activity. Counties with fewer than 1,000 permits in the trailing 24 months do not get a page.
Derived October 5, 2026. If you spot something that looks wrong, tell us; we would rather correct a number than defend it.
Frequently asked questions
How many residential solar permits were issued in Honolulu County in 2025?
6,227 residential solar permits were issued in Honolulu County, Hawaii in 2025, on 6,115 homes, in Scout Data's permit database. That compares with 6,538 in 2023.
What share of Hawaii's solar permits are in Honolulu County?
About 76%: 12,106 of 15,981 residential solar permits issued in Hawaii from September 2024 through August 2026.
What share of Honolulu County homes have solar panels?
This page does not publish a rooftop adoption rate for Honolulu County; the permit counts on this page are the better measure of activity.
How much does a residential solar project cost in Honolulu County?
The median declared valuation on Honolulu County residential solar permits issued from September 2024 through August 2026 is $31,000, across 12,102 permits that carried a value. Declared valuations understate contract prices in many jurisdictions, so treat this as a floor rather than a market price.
Can I cite these statistics?
Yes, cite freely with a link to this page. All figures were derived on October 5, 2026 from Scout Data's permit and property databases; the methodology section explains what is and is not counted.