Solar permits in Redmond — PSE net metering, Pacific NW irradiance, and Washington CETA
All residential solar PV systems in Redmond require a building permit for structural racking and roof attachment, and an electrical permit for DC wiring, inverter, AC disconnect, rapid shutdown, and interconnection preparation — apply through REPS for standard residential solar electrical permits or the PRO Portal for plan-reviewed scopes at redmond.gov. PSE (Puget Sound Energy) manages solar interconnection under Washington's state-mandated net metering for investor-owned utilities (up to 100 kW per customer). Submit the PSE net metering application concurrently with the DSC permit applications. After permits are finalized and inspections pass, PSE installs the bi-directional net metering meter. Verify current PSE net metering tariff at pse.com before finalizing solar financial projections. Washington L&I-licensed electricians are required.
Redmond's solar resource is one of the lowest in this guide — and honest about it. The Pacific Northwest's persistently overcast October through May rainy season produces significantly less solar radiation than any other city in this guide. Annual GHI of approximately 3.6 to 3.9 kWh/m2/day for the Seattle/Redmond area is substantially below DFW (5.0 to 5.3), San Marcos TX (5.0 to 5.3), Pharr TX (5.5 to 6.0), Lawton OK (5.0 to 5.3), and even Bowling Green KY (4.6 to 5.0). A 9 kW solar system in Redmond produces approximately 9,000 to 11,000 kWh per year — roughly half of the production from the same system in Pharr TX. Monthly production is extremely seasonal: June and July produce perhaps 3 to 4 times more than December and January. Despite the modest resource, solar remains financially viable in Redmond given the federal 30% ITC and PSE's net metering tariff — the net cost after ITC is the critical variable for financial returns in Redmond's lower-resource market. Use Seattle/Redmond-specific PVWatts data (not generic US or even generic Pacific NW data) for accurate financial projections. Washington's CETA policy environment, PSE's clean energy programs, and the tech community's environmental values all support solar adoption in Redmond even at lower payback than sun-belt markets. Battery storage provides meaningful grid independence value in Redmond's PSE service territory.
Three Redmond solar scenarios
| Variable | How it affects your Redmond solar permit |
|---|---|
| PSE net metering under WA state mandate | Washington law mandates net metering for PSE (up to 100 kW per customer). PSE manages interconnection. Submit PSE application concurrently with DSC permits. Verify current PSE net metering tariff at pse.com — this is the critical financial variable for Redmond solar economics. |
| Modest Pacific NW GHI ~3.6–3.9 kWh/m2/day | One of the lowest solar resources in this guide. System production is roughly half of Pharr TX or DFW. Use Seattle/Redmond-specific PVWatts data (47.7°N latitude) for financial modeling. Federal 30% ITC is the primary financial driver. Be skeptical of projections based on sun-belt irradiance data. |
| Washington CETA + PSE Clean Energy programs | Washington's carbon-free energy mandate and PSE's Clean Energy programs create policy and financial incentives for solar adoption. PSE may offer solar incentives or higher buyback rates for clean energy generation. Verify current PSE solar programs at pse.com. |
| Steep tilt angle for Pacific NW latitude | Redmond's 47.7°N latitude means a 40 to 47-degree panel tilt is optimal for annual production — steeper than Texas or Kentucky. South-facing roofs with 4:12 to 6:12 pitch need tilt brackets for optimal production. Ground mounts can be precisely tilted. Low winter sun angle makes steep tilt especially valuable in Pacific NW markets. |
Solar costs in Redmond
Installed $3.00 to $3.80 per watt before 30% ITC. 9 kW system: $27,000 to $34,200 before ITC. Battery (13.5 kWh): $11,000 to $16,000 before ITC. Eastside Seattle market commands premium installation costs. Contact (425) 556-7000 for permit fees.
Common questions
Is solar worth it in Redmond WA given the Pacific Northwest cloudiness?
Yes, though with realistic expectations — the federal 30% ITC is the primary financial driver in Redmond's modest-resource market. A 9 kW system in Redmond produces approximately 10,000 kWh per year — compare this to the same system producing 18,000 kWh in Pharr TX. The PSE net metering tariff determines the value of exported generation. Use Seattle/Redmond-specific PVWatts data for accurate financial projections. The tech community's environmental values and Washington's CETA policy environment support solar adoption beyond pure financial return for many Redmond homeowners. Verify PSE net metering tariff at pse.com before finalizing any solar financial model.
Redmond permit framework
(425) 556-7000 | permits@redmond.gov | 15670 NE 85th St, 2nd Floor | M/Tu/Th/F 8–5, Wed 10:30–5. REPS and PRO Portal at redmond.gov. PSE (888) 225-5773; L&I lni.wa.gov. WSEC. 811 before excavation.
Redmond: Microsoft HQ, CZ4C Pacific Marine
Redmond (~70,000, King County). Microsoft HQ, tech hub. CZ4C: ~23 degree F design heating, ~18–24 inch frost line, minimal cooling, 35+ inches rain. PSE for electricity AND gas. Washington L&I contractors.
Redmond permit contacts
DSC: (425) 556-7000 | permits@redmond.gov | 15670 NE 85th St, 2nd Floor, Redmond WA 98052 | REPS/PRO Portal at redmond.gov. PSE: (888) 225-5773, pse.com. L&I: lni.wa.gov. 811 before excavation. Contact DSC at (425) 556-7000 before starting any permitted project to confirm current WSEC requirements, permit documentation standards, and fee schedule.
Phone: (425) 556-7000 | Email: permits@redmond.gov
Hours: Mon/Tue/Thu/Fri 8:00 AM–5:00 PM | Wed 10:30 AM–5:00 PM
Portals: REPS (OTC permits) & PRO Portal (plan-review) at redmond.gov
PSE (Puget Sound Energy) — electric + gas: (888) 225-5773 | pse.com
Solar in Redmond: honest Pacific NW resource context, CETA policy support, and PSE programs
Solar energy in Redmond occupies a distinctive niche in the Pacific Northwest energy market — financially less compelling than sun-belt markets on a pure energy-production basis, but supported by a combination of Washington state policy (CETA's carbon-free mandate), PSE's clean energy programs, the tech community's environmental values, and the federal 30% ITC that reduces net system cost regardless of local solar resource. A Redmond homeowner who approaches solar primarily as a financial investment needs to apply honest Pacific Northwest irradiance data (3.6 to 3.9 kWh/m2/day) and realistic PSE net metering tariff projections — not the Texas or Arizona solar projections that some national solar installers use in their financial models. A homeowner who approaches solar as a combination of environmental investment, energy independence, and partial financial return will find the economics more satisfying at Redmond's resource level, particularly after the federal 30% ITC.
The steep tilt angle appropriate for Redmond's latitude (47.7°N) — approximately 40 to 47 degrees from horizontal — means that the low-pitch 4:12 roofs common in Pacific Northwest residential construction (which are approximately 18 to 20 degrees of tilt) are significantly sub-optimal for solar production in Redmond's market. A 47.7°N-latitude home with a 4:12 pitch south-facing roof will produce meaningfully less than the PVWatts estimate for an optimally tilted installation. For homeowners with better-tilted roofs or the ability to install ground-mounted systems with adjustable tilt, the production differential is real. Tilt brackets installed on low-pitch roofs can improve annual production by 8 to 15% in Pacific Northwest markets — a worthwhile investment for homeowners focused on maximizing production. PSE's net metering program under Washington's state mandate provides the financial framework for exported generation — verify current net metering tariff and any time-of-use provisions at pse.com before finalizing any Redmond solar financial model. Contact DSC at (425) 556-7000 for solar permit requirements through REPS and the PRO Portal at redmond.gov.
Redmond's unique permit context: PSE dual-fuel, Washington WSEC, L&I licensing, and the tech premium market
Redmond stands out in this guide in several ways simultaneously. PSE (Puget Sound Energy) provides both electricity and natural gas — a single utility for both fuel types, similar to Xcel Energy in St. Cloud MN and Consumers Energy in Wyoming MI but unique among the Pacific Northwest cities in the guide. The Washington State Energy Code (WSEC) governs all energy provisions and is separate from and often stricter than the IECC used in Texas, Oklahoma, and Midwest states. Washington L&I (Labor and Industries) at lni.wa.gov provides the contractor licensing framework — publicly verifiable credentials for all licensed builders, electricians, plumbers, and HVAC contractors working in Redmond. The permit exemptions for detached decks (≤30 inches above grade, not over basement) and same-opening window replacements distinguish Redmond from most other cities in this guide where virtually all deck and window work requires permits. And Redmond's position as Microsoft's global headquarters city creates a construction market context — premium specifications, high labor costs, tech-savvy homeowners who conduct rigorous financial analysis before making home improvement investments — that is unlike any other city in this guide. The Development Services Center at (425) 556-7000 or permits@redmond.gov, REPS for over-the-counter permits, and the PRO Portal for plan-reviewed permits (both at redmond.gov) are the tools for navigating this distinctive construction environment. PSE: (888) 225-5773, pse.com. Washington L&I: lni.wa.gov. 811 before excavation: 2 to 10 business days per PSE's recommendation. Contact DSC at (425) 556-7000 with pre-application questions to confirm current WSEC requirements, permit documentation standards, and fee schedule before starting any permitted project in Redmond.
The Development Services Center (DSC) at (425) 556-7000 or permits@redmond.gov at 15670 NE 85th Street, 2nd Floor, Redmond WA 98052 is the point of contact for all residential permit activity. Hours: Monday, Tuesday, Thursday, Friday 8:00 AM to 5:00 PM; Wednesday 10:30 AM to 5:00 PM. Apply online through REPS for over-the-counter permits or the PRO Portal for plan-reviewed permits — both at redmond.gov. PSE (Puget Sound Energy) at (888) 225-5773 or pse.com coordinates all utility work for both electricity and natural gas in Redmond. Washington L&I contractor licensing verification at lni.wa.gov is a pre-engagement baseline for all construction contracts. Call 811 two to ten business days before any excavation anywhere in Redmond's PSE service territory — utility lines run throughout residential lots. The Washington State Energy Code's strict provisions for the Pacific Marine CZ4C climate, combined with the tech community's premium specifications and environmental values, make Redmond one of the most distinctive and quality-conscious construction markets in the United States. For any questions about specific project requirements, permit documentation, or fee schedule, contact DSC at (425) 556-7000 during business hours before starting any construction project in Redmond.
Redmond's Development Services Center at (425) 556-7000 serves one of the most distinctive construction markets in the United States: Microsoft's hometown, the Eastside Seattle tech hub, a Pacific Marine CZ4C climate with minimal cooling but genuine heating needs, PSE's dual-fuel utility structure and clean energy transition, the Washington State Energy Code's strict energy provisions, and Washington L&I's verifiable contractor licensing framework. REPS portal for OTC permits; PRO Portal for plan-reviewed permits — both at redmond.gov. Contact (425) 556-7000 or permits@redmond.gov before starting any Redmond permitted construction project. PSE: (888) 225-5773. L&I: lni.wa.gov. 811: two to ten business days before any excavation. Redmond's two unique permit exemptions — detached decks at or below 30 inches above adjacent grade, and same-opening window replacement without structural changes — provide meaningful convenience for homeowners undertaking the most common deck and window improvement projects in the city's existing housing stock.
PSE (Puget Sound Energy) at pse.com serves Redmond with electricity and natural gas — call (888) 225-5773 for service capacity questions, panel upgrades, heat pump rebate programs, solar interconnection, and all utility coordination. Washington L&I at lni.wa.gov handles contractor licensing verification for all Redmond construction projects — verify license type, number, and expiration before signing any contract. DSC at (425) 556-7000 or permits@redmond.gov handles all permit applications at 15670 NE 85th Street, 2nd Floor. Apply through REPS (redmond.gov) for over-the-counter permits and the PRO Portal for plan-reviewed projects.
General guidance based on publicly available sources as of April 2026. Verify requirements with DSC before starting work. For a personalized report, use our permit research tool.