Solar Panel Installation Cost in Washington (2026): Average Price & Estimate

Solar Panel Installation Cost in Washington

Estimated solar panel installation cost in Washington

$19,200–$38,400

Roughly about 28% above the national average.

High labor rates and strict permitting raise costs.

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Based on Washington, DC pricing.

Estimated cost range

$19,200–$38,400

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An estimate for planning, not a quote. Get written quotes from local pros below.

Estimate, not a quote. Local prices vary by contractor and project. These are 2026 estimates for Washington, DC. Get written quotes from licensed Washington contractors before you budget.

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What to know about solar panel installation in Washington

Even with cold winters, Washington gets enough sun for solar to pay off, and panels actually run more efficiently in cool temperatures.

What affects solar panel installation cost in Washington

Beyond the local market, the same factors that drive solar panel installation cost everywhere apply in Washington:

System size in kilowatts, based on your electricity use.
Panel and inverter quality.
Roof type, pitch, and complexity.
Whether you add battery storage (often $10,000 or more).

Solar Panel Installation cost by system size in Washington

These figures are adjusted for Washington pricing (about 1.28x the national average), so they reflect what local homeowners actually pay.

Estimated solar panel installation cost by system size in Washington (2026)

System size	Typical cost in Washington	Notes
Small (about 6 kW)	$13,400 to $26,900	installed
Average (about 8 kW)	$19,200 to $38,400	The baseline.
Large (about 12 kW)	$26,900 to $53,800	installed
With battery storage	$30,700 to $61,400	installed

Frequently asked questions

How much does solar panel installation cost in Washington?

In Washington, DC, solar panel installation typically costs $19,200 to $38,400 in 2026 for a standard project, about 28% above the national average. Your exact price depends on size, materials, and scope.

Why does solar panel installation cost more or less in Washington?

High labor rates and strict permitting raise costs. Labor rates, permit costs, and local demand are the main reasons Washington prices differ from the national average.

Do I need a permit for solar panel installation in Washington?

Most solar panel installation projects require a permit. Requirements vary by city and District of Columbia jurisdiction, so confirm with your local building department. A licensed contractor usually pulls the permit for you.

When is the best time of year for solar panel installation in Washington?

In Washington, exterior work is easiest from late spring through early fall. Winter weather can delay roofing, siding, concrete, and foundation jobs, and some crews book up fast once the weather breaks.

Is solar panel installation cheaper outside Washington?

Sometimes. Washington runs about 28% above the national average. Nearby smaller towns with lower labor costs can come in cheaper, while denser urban areas often cost more. Always compare quotes from contractors who serve your specific area.