King County · NEC 2020 · Seattle City Light or PSE · AHJ Confirmed Per Address
Seattle Solar
Permit Design.
Seattle City Light or Puget Sound Energy?
Confirmed Per Address · WA No Sales Tax on Solar.
Seattle solar permit drawings for City of Seattle and all King County AHJs. Seattle City Light (SCL) serves core Seattle; Puget Sound Energy (PSE) serves most suburbs including Bellevue, Redmond, and Kirkland. Different utilities, different interconnection applications. Washington has no sales tax on solar — significant for commercial projects. NEC 2020. Free for first-time clients.
SCL or PSE Confirmed per address
·WA No Sales Tax Solar systems exempt from WA sales tax
·NEC 2020 Washington standard
·Free AHJ revisions
SCL or PSEUtility confirmed per address · Different programs
WA Sales TaxNo sales tax on solar systems · Big for commercial
Many AHJsSeattle, Bellevue, Redmond, Kirkland + more
24–48 hrStandard plan set delivery
2026 CodesElectrical: NEC 2020 (Washington)Structural: IBC/IRC 2021 (WA)SCL territory: City of Seattle · Municipal · Hydro-based low ratesPSE territory: Bellevue, Redmond, Kirkland, Renton, Sammamish, Issaquah, ShorelineLast verified July 2026
Seattle Has Two Solar Utilities — SCL and PSE — With Different Programs
Seattle City Light Serves Core Seattle. Puget Sound Energy Serves Most Suburbs. Different Interconnection Applications, Different Net Metering Programs. Utility Confirmed Before You Build.
Seattle City Light (SCL) is a municipal utility serving the City of Seattle with among the lowest retail electricity rates in the US — hydro-powered, typically 10 to 12 cents per kWh. Most King County suburbs — Bellevue, Redmond, Kirkland, Renton, Issaquah, Sammamish, Shoreline — are served by Puget Sound Energy (PSE), an investor-owned utility with higher retail rates and stronger solar ROI. SCL and PSE have separate interconnection applications and separate net metering programs. We confirm utility per address before building every Seattle plan set.
Seattle City Light — Municipal Utility · Core Seattle · Low Hydro Rates
✅SCL serves City of Seattle — municipal utility, hydro-powered, very low retail rates (~10–12¢/kWh)
⚠️SCL's low retail rates mean lower per-kWh savings than PSE territory — longer payback period
✅SCL net metering: retail rate credit for solar exports — required for municipal utilities under WA law
⚠️Bellevue, Redmond, Kirkland, Renton, and suburbs are PSE — NOT SCL — different application
✅SCL interconnection: submit simultaneously with Seattle DCI building permit
WA No Sales Tax · Property Tax Exemption · Many King County AHJs
✅Washington State: no sales tax on solar energy systems — significant savings on commercial installations
✅Washington property tax exemption for solar energy systems — permanent
⚠️City of Seattle, Bellevue, Redmond, Kirkland, Renton, Shoreline all have separate building departments
✅NEC 2020 under Washington State Building Code — consistent across all King County AHJs
✅No PE stamp required for standard residential solar in Washington
⚠️ Bellevue, Redmond, Kirkland, Renton, Sammamish, and most King County suburbs are Puget Sound Energy — NOT Seattle City Light. SCL and PSE have different interconnection applications. A PSE application submitted for an SCL address, or vice versa, results in rejection. We confirm utility per address for every Seattle project.
Why Seattle Installers Outsource
Wrong Utility Application. SCL Low Rate Economics Misunderstood. King County AHJ Fragmentation.
Submitting a PSE Application for a Seattle City Light Address — or Vice Versa
SCL and PSE are separate utilities with separate interconnection portals and applications. Installers who work both SCL and PSE territory must use the correct application for each address. A PSE application submitted to SCL results in rejection, and an SCL application submitted for a PSE address fails at the first contact. We confirm utility per address before building every Seattle plan set.
Designing Seattle City Light Solar With Expectations From Higher-Rate Markets
SCL retail rates are approximately 10 to 12 cents per kWh — among the lowest in the US. Solar savings per kWh are proportionally lower than in markets like Las Vegas (15¢), Nashville (11¢), or Miami (12¢). ROI timelines for SCL customers are longer than PSE customers. PSE territory (Bellevue, Redmond, Kirkland) has higher rates and stronger solar economics. Setting accurate expectations matters.
King County AHJ Fragmentation — Each City Has Its Own Building Department
City of Seattle, Bellevue, Redmond, Kirkland, Renton, Issaquah, Shoreline, Burien, and unincorporated King County each have separate building departments with different permit portals and timelines. Routing to Seattle Department of Construction and Inspections for a Bellevue address results in rejection. We confirm AHJ per address for every Seattle metro project.
Seattle Solar Permit Services
Seattle City Light / PSE Interconnection. NEC 2020. All Seattle AHJs.
Seattle Residential Solar Permit Design
NEC 2020, IBC/IRC 2021. SCL or PSE interconnection confirmed per address. Seattle DCI, King County, or suburb AHJ confirmed. Battery (NEC 2020 Article 706) where included. WA sales tax exemption note for commercial.
Residential Solar Permit Design Services →Seattle Commercial Solar Permit Design
Commercial rooftop drawings for King County. NEC 2020, IBC 2021. SCL or PSE commercial interconnection. WA no sales tax on solar — significant commercial advantage. Seattle's tech campus and data center corridor creates strong commercial solar demand. PE stamp. Pacific Northwest ASCE 7 calcs.
Commercial Solar Permit Design Services →Seattle Battery Permit Plans
Solar-paired and standalone battery permit drawings. NEC 2020 Article 706. Seattle's increasing grid stress during summer heat events and occasional winter storm outages create battery resilience demand. Battery maximizes self-consumption — particularly valuable for PSE customers with higher retail rates.
Battery Storage Permit Design Services →Seattle EV Charger Permit Design
EV charger permit drawings for King County. NEC 2020 Article 625, load calculations. Washington has the highest EV adoption rate in the US. Seattle's large tech workforce and outdoor-oriented demographics drive residential EV demand. Commercial fleet EV strong across Microsoft, Amazon, and Boeing campuses.
EV Charger Permit Design Services →Seattle Solar Market — 2026
Four Things That Define Solar in Seattle.
SCL vs PSE
Seattle City Light Serves Core Seattle — PSE Serves Most Suburbs
Seattle City Light (municipal, hydro-powered) serves the City of Seattle at retail rates of approximately 10 to 12 cents per kWh — among the lowest in the US. Puget Sound Energy (investor-owned) serves Bellevue, Redmond, Kirkland, Renton, Issaquah, Sammamish, Shoreline, and most King County suburbs at higher retail rates. PSE territory solar ROI is stronger than SCL territory because the retail rate is higher — every avoided kWh saves more.
WA No Sales Tax
Washington State No Sales Tax on Solar — Significant Commercial Advantage
Washington State exempts solar energy systems from sales tax. On a $500,000 commercial installation, the 10.25% Washington sales tax exemption saves over $50,000 — a material project cost reduction. Washington also has a property tax exemption for solar energy systems. The combination of no sales tax and no state income tax on solar profits makes Washington particularly attractive for commercial solar.
WA EV Leader
Washington Has the Highest EV Adoption Rate in the US
Washington State consistently ranks first in the US for electric vehicle adoption per capita. Seattle's tech workforce, environmental culture, and strong charging infrastructure drive this adoption. EV + solar + battery is a natural package for Seattle homeowners. Commercial fleet EV demand at Amazon's headquarters, Microsoft's Redmond campus, and Boeing's manufacturing facilities creates large-scale charging infrastructure projects.
Many AHJs
King County Metro Has Many Separate Building Departments
City of Seattle, Bellevue, Redmond, Kirkland, Renton, Issaquah, Shoreline, Burien, Auburn, Kent, Federal Way, and unincorporated King County each maintain separate building departments with different permit portals, fees, and review timelines. We confirm the exact building department per address before building every Seattle metro plan set.
AHJ Solar Permit Design Seattle
Seattle and All Surrounding Jurisdictions — Seattle City Light / PSE Interconnection Formatted.
We cover City of Seattle, King County, and all Seattle metro AHJs. SCL or PSE confirmed per address.
| Jurisdiction | Utility | Permit Type | Key Notes | Review Time |
|---|---|---|---|---|
| City of Seattle | Seattle City Light | Bldg + Elec | Seattle DCI · Own portal · $350–700 fee · 2–4 week review | 2–4 weeks |
| Bellevue | Puget Sound Energy | Bldg + Elec | City of Bellevue Development Services · PSE territory · Own dept | 2–3 weeks |
| Redmond / Kirkland | Puget Sound Energy | Bldg + Elec | Own city building depts · PSE territory · Tech campus area | 2–3 weeks |
| Renton / Issaquah | Puget Sound Energy | Bldg + Elec | Own city building depts · PSE territory · South King County | 2–3 weeks |
| Shoreline / Burien | SCL / PSE (confirm) | Bldg + Elec | Own city building depts · Confirm utility per address | 2–3 weeks |
| King County (unincorp.) | SCL or PSE (confirm) | County Bldg + Elec | King County Building Division · Confirm utility per address | 2–4 weeks |
| Snohomish County (Everett) | Snohomish PUD | Bldg + Elec | Snohomish County PUD · Different utility · Own building depts | 2–4 weeks |
References: Seattle City Light Solar · PSE Solar
What You Get
Solar Permit Package Seattle — Seattle Solar Permit Plan Sets. Seattle City Light / PSE Ready.
01
Cover Sheet — Seattle PV Permit Plans
NEC 2020 · IBC/IRC 2021 (WA) · Seattle AHJ · Seattle City Light / PSE utility
02
Site Plan
Meter and Seattle City Light / PSE interconnection access · ASCE 7 local wind values · Applicable wind zone
03
Roof Layout
Seattle rooftop conditions · Array diagram · Pitch, azimuth, setbacks · IFC fire access paths
04
Single-Line Diagram
NEC 2020 §690.12 rapid shutdown · Battery (Article 706) where included · Seattle City Light / PSE bidirectional meter
05
Structural Calculations
IBC/IRC 2021 (WA) · ASCE 7 local wind loads · Gravity and lateral loads · PE stamp for commercial
06
Rapid Shutdown + Labels
NEC 2020 §690.12 · Battery shutdown interface (Article 706)
07
Equipment Datasheets + Seattle City Light / PSE Interconnection Package
UL-listed module, inverter, racking, and battery datasheets · Seattle City Light / PSE interconnection application · State solar incentive notes
Seattle Plan Set — 24 Hours.
Seattle City Light / PSE Interconnection · NEC 2020 · All Seattle AHJs
How It Works
Three Steps. 24 Hours. Seattle AHJ Ready.
📋
Submit the Project
Share address, specs, and design. We confirm the AHJ, Seattle City Light / PSE interconnection, and NEC 2020 format.
5 minutes⚡
We Build the Plan Set
NEC 2020, IBC/IRC 2021 (WA). Seattle AHJ formatted. Seattle City Light / PSE interconnection package. Battery where included.
24–48 hours✅
Submit Permit + Interconnection
Submit Seattle DCI or King County building permit and SCL or PSE interconnection simultaneously. Interconnection: 4–8 weeks. Free revisions for any AHJ correction on our design.
Free revisions🛡️
The Permit Design Commitment
Solar permit services in Seattle — what every installer and EPC gets.
✓AHJ confirmed per address before we build
✓Seattle City Light / PSE interconnection package included
✓24–48 hour delivery on standard residential projects
✓NEC 2020 formatted for WA — not California NEC 2026
✓Free revisions for any AHJ correction on our design
Start Free Trial →
First plan set free.
Licensed installers & EPCs only.
Licensed installers & EPCs only.
FAQ
Questions Seattle Installers Ask Us
Seattle City Light (SCL) is the municipal utility serving the City of Seattle. Most suburbs — Bellevue, Redmond, Kirkland, Renton, Issaquah, Sammamish, Shoreline — are served by Puget Sound Energy (PSE). SCL and PSE have different net metering programs and interconnection applications. We confirm utility per address before building every Seattle plan set.
Seattle City Light is a municipal utility serving the City of Seattle with very low retail rates (hydro-powered). Puget Sound Energy is an investor-owned utility serving most King County suburbs with higher retail rates. Both offer net metering, but SCL's low retail rate means lower savings per kWh; PSE customers have stronger solar ROI.
Washington State has no sales tax on solar energy systems — a significant saving on commercial installations. Washington has a property tax exemption for solar energy systems. Federal 25D residential credit expired December 31, 2025.
NEC 2020 under Washington State Building Code.
Washington has no statewide PE stamp requirement for standard residential rooftop solar. Seattle DCI and King County do not typically require a PE stamp for residential rooftop installations. Commercial projects require PE-stamped drawings.
Many. City of Seattle, Bellevue, Redmond, Kirkland, Renton, Issaquah, Shoreline, Burien, and King County unincorporated each have separate building departments. We confirm AHJ per address before building.
Most Seattle residential plan sets ship in 24 to 48 hours. Battery same day. Commercial: 3 to 5 business days. Rush available.
⚡
Reviewed by the Permit Design Engineering Team — Licensed PE
SCL vs PSE utility territories in King County confirmed. SCL retail rates (~10–12¢/kWh, hydro-based) confirmed. WA no sales tax on solar confirmed from WA Dept of Revenue. WA property tax exemption for solar confirmed. NEC 2020 WA state adoption confirmed. Federal 25D expiration confirmed. Last reviewed July 2026.