Solar Panel Installation cost in Seattle, WA
Seattle, WA · updated August 2026
$34,500
Typical local cost
$19,500 – $62,400
Typical range
- per watt installed
- $3 – $5
- Permit
- Yes
- Typical timeline
- 1-3 days of installation
Installed, local pricing
$205 – $675 in fees
1-3 days of installation, 6-14 weeks including permitting and utility interconnection
Seattle runs +30% against the U.S. average · data confidence Medium · modeled estimate, not a quote
Most Seattle homeowners pay around $34,500. The local adjustment for this trade is x1.301 — driven mainly by King County labor rates and 60% exposure to local code requirements.
Estimate your Seattle job
Priced with this market's cost index, so the calculator, the size table and the ranges on this page all agree.
Payback period
9.1 years
- System size
- 10.9 kW
- Gross cost
- $36,555
- Net cost after credit
- $25,588
- Estimated 25-year savingsAssumes modest utility rate escalation
- $55,412
- Annual production
- 16,500 kWh
Estimates only. Local pricing, site conditions and code requirements change the real number.
Cost by project size
Generated from the same unit pricing the calculator uses.
| Project size | Estimated range |
|---|---|
| 5,000 watt installed | $15,000 – $25,000 |
| 7,000 watt installed | $21,000 – $35,000 |
| 8,500 watt installed | $25,500 – $42,500 |
| 11,000 watt installed | $33,000 – $55,000 |
| 14,500 watt installed | $43,500 – $72,500 |
Based on Seattle pricing of $3–$5 per watt installed.
Where the money goes
- Labor
- $10,400
- 30% of median
- Materials
- $24,200
- 69% of median
- Permit & fees
- $440
- 1% of median
Seattle project costs+30% vs U.S. average
Based on King County labor rates, local material logistics and permit-fee posture for this trade.
What the project looks like start to finish
Typical sequence for this scope. Timing varies with contractor backlog and plan-review queues.
01
Planning & quotes
Scope, material choice, contractor selection
02
Permit application
Filed with City of Seattle building department
03
Materials & staging
Order lead time on non-stock materials
04
Installation
1-3 days of installation, 6-14 weeks including permitting and utility interconnection
05
Inspection
Structural / mounting inspection, Electrical rough, Final inspection, Utility interconnection
06
Closeout
Final sign-off, warranty and documentation
Seattle labor intelligence
What the trade charges here, and how much of your price it is.
Loaded hourly rate
$100–$130
Energy crews in King County · +34% vs U.S. ($85/hr)
Typical crew
4 × 3 days
On-site time for a typical solar job here.
Labor in the price
$10,400
30% of the median — the rest is material, disposal and permit.
Because labor is 30% of this job, Seattle wage levels move the price far more than material prices do. A quote well under this labor figure usually means a smaller crew, a longer schedule, or unlicensed help.
Basis: Hometriva labor model: national energy crew rates adjusted by the King County labor factor (x1.338). · BLS Occupational Employment and Wage Statistics, Hometriva methodology
Why Seattle differs from the national average
The local delta, broken into dollars by driver.
Material and delivery+$2,850
Materials are nationally traded, so they move less — but delivery into this market runs 15% over baseline.
Trade labor rates+$2,675
King County crews price 34% above the national average, and labor is 30% of this job.
Code and inspection load+$2,025
Solar Panel Installation carries 60% exposure to local code requirements, and this jurisdiction's review load indexes at x1.13.
Permit fees+$125
Fees are paid to the jurisdiction, not the contractor, and are budgeted separately from the contract price.
Basis: Decomposition of the modeled Seattle median against the U.S. median for this scope. · City of Seattle building department, Hometriva methodology
Seattle vs Washington vs the U.S.
Change the inputs, see your number
The same local model, run against your job instead of the average one.
Simulated solar panel installation in Seattle
$34,940
Likely range $19,940 – $62,840
Simulated from the same local model as the numbers above — it changes the inputs, not the pricing method.
What makes the number move
- System size in kW DC
- Panel and inverter selection (string versus microinverters)
- Battery storage
- Roof age, material and structural reinforcement
- Federal tax credit and utility interconnection fees
Who issues each permit
Tracked per discipline — the building permit issuer is not always the body that reviews electrical, plumbing, zoning or fire.
| Discipline | Issuing authority |
|---|---|
| building | City of Seattle building departmentModeled estimate |
| electrical | City of Seattle building departmentModeled estimate |
| mechanical | City of Seattle building departmentModeled estimate |
| plumbing | City of Seattle building departmentModeled estimate |
| zoning | City of Seattle building departmentModeled estimate |
| fire | City of Seattle building departmentModeled estimate |
Permit requirement in Seattle
Yes — a permit is required for solar panel installation in Seattle, WA. The work must be inspected before it can be closed out, and a licensed contractor generally has to pull the permit.
- Permitting authority
- City of Seattle building departmentModeled estimate
- Permit fee
- Estimated allowance $205–$675Modeled from comparable fee schedules — not an official quoted fee.
Inspections
- Structural / mounting inspection
- Electrical rough
- Final inspection
- Utility interconnection
Local conditions that change this job
Only the exposures that materially affect solar panel installation.
Solar irradiance
Moderate40/100
Design wind speed exposure
Moderate46/100
Named-storm exposure
Low34/100
SDCI review timelines, seismic detailing and energy-code requirements add meaningful cost and schedule to structural and envelope work.
Nearby market comparison
What Seattle homeowners actually paid
Real reported invoices from this market, aggregated. Add yours — it takes 20 seconds and no personal details.
Quotes homeowners were given in Seattle
Quotes run ahead of final invoices. Reporting yours shows the local spread and where there is room to negotiate.
How Hometriva estimates Seattle solar costs
Hometriva does not publish invented city prices. The Seattle estimate for solar panel installation is produced by this chain, and every input is stored separately:
- National baseline$26,500
Typical U.S. cost for solar panel installation on a single-family home.
- Local labor factorx1.338
Seattle-area trade labor rates, weighted at 30% of this job.
- Material factorx1.153
Material and delivery pricing into King County, weighted at 70%.
- Regulatory factorx1.128
Local code, product-approval and inspection load, applied at 60% for this project type.
- Applied multiplierx1.301
Blended Seattle adjustment specific to solar panel installation.
- Permit component$205 – $675
Budgeted separately from the contract price because it is paid to the jurisdiction.
Because labor, material and regulatory factors are weighted per project, solar panel installation in Seattle carries a different local adjustment than other trades in the same market.
Reviewed by
Hometriva Cost Data Desk
Maintains the unit-cost baselines, local adjustment factors and material pricing. Reviewed for solar panel installation pricing in Seattle, WA.
- • National unit-cost baselines against current trade pricing
- • Local labor and materials factors for the market
- • Material installed-cost ranges and service life
Last reviewed August 2026 · Editorial standards · Report an error
Frequently asked questions
Do solar panels need a permit in Florida?
Yes. Solar requires a building permit with engineered attachment details and an electrical permit, plus an interconnection agreement with your utility before the system can be energized.
Should I replace my roof before installing solar?
If your roof has fewer than about 10 years of life left, replace it first. Removing and reinstalling an array later commonly costs $3,000-$7,000.
Sources
Sources & verification
- City of Seattle building department
- Seattle permit portal
- Washington State Building Code Council
- BLS Occupational Employment and Wage Statistics
Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.