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Solar · Seattle, WA · 2026 cost guide
How much does solar panels cost in Seattle, WA?
In the Seattle-Tacoma-Bellevue, WA area, a typical 8 kW system before incentives runs about $24,000 to $33,600 in 2026, about 20% above the national range. Contractor labor here is indexed at 1.20 against the U.S. average, and that is what moves the numbers; equipment and materials cost about the same everywhere.
- Cost per watt
- $3–$4.20installed, before incentives
- 8 kW system
- $24,000–$33,600before incentives, about a $150 to $200 monthly bill
- 10 kW system
- $30,000–$42,000before incentives, about a $200 to $250 monthly bill
- Battery add-on
- $12,000–$21,600one 10 to 15 kWh battery, installed
Solar in Seattle has the longest payback of the 25 largest U.S. metros, and the reasons are plain. The metro averages only 3.6 peak sun hours a day, the lowest on our list, with winter cloud cover that blanks November through February. And the power it displaces is cheap: Seattle City Light and Puget Sound Energy charge about $0.12 per kWh, mostly from hydro. An 8 kW system runs $24,000 to $33,600 before incentives, and what makes it work at all is policy.
What's different in Seattle
Production is summer-heavy and modest. At 3.6 peak sun hours, an installed kilowatt here yields well under the national planning figures; expect the year's output to come mostly from May through September, when Seattle days are long and clear and panels run cool. December production can be a small fraction of July's. Trees matter more than in a sunny metro, since a Douglas fir shadow on an east- or north-facing slope can erase a marginal case entirely. Ask the installer for a month-by-month estimate modeled for your roof, with shade, and be skeptical of any proposal using a Sun Belt production factor.
Policy carries the math. Washington law guarantees net metering through at least 2029, so summer surplus sent to Seattle City Light or PSE is credited at retail against winter use, which is exactly what a summer-heavy production curve needs. Credits reset once a year in spring, so confirm the date with your utility and size the array to your annual use rather than beyond it. Systems up to 100 kW are exempt from Washington sales tax, a meaningful saving in a high-sales-tax state. Washington has no income tax, so there is no state tax credit, and the federal credit ended after 2025. Ask whether any utility program is currently open.
Roofs are the local risk. Seattle roofs grow moss, collect fir needles, and see heavy rain and November windstorms rather than snow, so racking needs a wind rating, flashing needs to be done right, and the roof under the array should have fifteen years left; removing panels to reroof later is expensive. Panels can help keep moss off the shingles beneath them, but debris collects along the lower edge and should be cleared. Permits run through Seattle SDCI, King County, or your suburb, and interconnection through City Light or PSE. A battery does not shorten payback under net metering, but windstorm outages give backup real value.
Solar Panel prices in Seattle vs. the national guide
These are the ranges from our national solar panels cost guide next to the same items scaled by the Seattle, WA labor index of 1.20. Rows marked fixed are materials only and do not move with local labor.
| Item | National range | Seattle, WA |
|---|---|---|
| Cost per watt | $2.50–$3.50 | $3–$4.20 |
| 8 kW system | $20,000–$28,000 | $24,000–$33,600 |
| 10 kW system | $25,000–$35,000 | $30,000–$42,000 |
| Battery add-on | $10,000–$18,000 | $12,000–$21,600 |
Local tip: Get a shade study before any bid; on a Seattle roof with 3.6 peak sun hours, one Douglas fir on the south side is the difference between a system that pays back and one that never does.
Seattle at a glance
- Climate zone
- 4Cmarine
- Labor index
- 1.20vs. U.S. average 1.00
- Electricity
- $0.12/kWhSeattle City Light and Puget Sound Energy
- Peak sun hours
- 3.6kWh/m²/day, annual average
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Get my solar estimate →Solar Panel cost questions in Seattle, answered.
Is solar worth it in Seattle with so little sun and such cheap power?
Only on the right roof and with realistic expectations. Seattle's 3.6 peak sun hours and hydro rates near $0.12 per kWh give it the longest payback of the 25 largest metros, so an unshaded south-facing roof is close to a requirement. What helps is full retail net metering through 2029 and the state sales tax exemption. Many Seattle owners go ahead for the long warranty and the outage backup a battery adds rather than for a fast payback.
How does net metering work with Seattle City Light and PSE?
Excess power you export is credited kilowatt-hour for kilowatt-hour against power you draw later, at retail value, which lets long summer days pay for dark winter months. Washington law guarantees this through at least 2029. Unused credits reset once a year in spring, so confirm the exact date with City Light or PSE and avoid oversizing; surplus beyond your annual use is given up rather than paid out.
Are there any Washington incentives for solar in 2026?
The main one is the state sales tax exemption on solar systems up to 100 kW, which trims the installed price in a state with high sales tax. Washington has no income tax, so there is no state tax credit, the state's earlier production incentive has been closed to new applicants for years, and the federal credit ended after 2025. Ask your installer and City Light or PSE whether any utility program is open for your address.
Will moss and fir needles hurt solar panels in Seattle?
Panels themselves shed moss better than shingles because the glass dries fast and sits at a tilt, and they shade the roof beneath, but needles and leaves collect along the bottom edge and in the gap under the array. Have the installer leave clearance for cleaning and ask about a maintenance visit each spring. More important is the roof itself: get moss treated and the roof assessed before panels go on.
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