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For Homebuilders & Developers

Solar for Homebuilders in Western Washington

Solphos delivers solar for homebuilders in Western Washington, adding value, reducing buyer utility costs, and meeting Washington State Energy Code (WSEC) requirements. We handle design, permitting, and inspections from start to finish, with fixed pricing so there are no surprises on your budget or your timeline.

New-construction home with rooftop solar earning WSEC energy credits

Builder Associations We Work With

MBAKS member logo
Built Green certified logo

Why Builders Are Adding Solar

Solar Sells. The Numbers Prove It.

One of the fastest-growing ways Western Washington builders are meeting WSEC requirements and adding visible value to every new home.

up to 4.5
WSEC energy credits earned
4%
resale premium over comparable homes
84%
of buyers say energy efficiency matters
$4–6k
added home value per kW installed

WSEC Compliance

How Solar Stacks Up Against Other Credit Options

The 2021 WSEC requires builders to earn a set number of energy credits. Solar PV (Option 6.1) delivers the highest credits at the lowest installed cost, and it’s the only option your buyers can actually see and tell their friends about.

Credit OptionEstimated Cost per Credit
Efficient Building Envelope$4,500
Air Leakage + HRV$5,000
High-Efficiency Heat Pump$6,000
Solar PV (Option 6.1) BEST VALUE$3,900

Most builders size up to 6–10 kW, earning more credits while giving buyers a meaningful energy story.

See the full WSEC energy credit breakdown →

New home construction blueprints with solar panels in Western Washington

Our Process

How We Work With Homebuilders in Western Washington

1

Streamlined, Fixed-Price Process

We know builders run on tight schedules and fixed budgets. That’s why we quote a single fixed price per system: no change orders, no surprises. You get a clear number before ground breaks and a committed installation window that fits your schedule.

Solphos solar installation on new construction in Bellevue, WA
Sustainable home construction site with solar blueprints, Western Washington
2

We Handle Compliance End-to-End

Site evaluation, permitting, inspection, and WSEC documentation, including shading analysis, expected kWh output, and net-metering paperwork with Seattle City Light or PSE. You hand us the address; we hand you a file-ready compliance package.

3

Coordinated With Your Other Trades

We coordinate directly with roofers and electricians early in the build, so conduit runs, penetrations, and service upgrades happen in the right sequence, not as a scramble at the end. One contact. Zero surprises.

Solar panels on pallets in front of a new construction home in Bellevue, WA
Tesla Powerwall 3 battery backup system for new construction
4

Battery Backup as a Builder Upsell

Pairing solar with Tesla Powerwall 3 lets you offer buyers backup power during outages, a premium feature that costs you nothing to sell and adds meaningful value to your homes. We handle the full solar-to-battery integration. See Battery Backup →

Common Questions

Builder FAQs

Will cloudy weather hurt performance?+

No. High-efficiency panels and microinverters perform well in diffuse light, which is most of the year in Western Washington. We use shading analysis and historical weather data to size each system accurately, so your buyers get realistic performance projections, not optimistic guesses.

Can solar costs be bundled into the construction loan?+

Yes, most lenders allow solar to be included in construction financing when it’s part of the original build scope. We can provide the system spec and cost documentation your lender needs. Some programs also allow the buyer to roll it into their permanent mortgage at closing.

Does it delay the build?+

Not when planned early. We coordinate permitting and inspections in parallel with your other trades, so there’s no last-minute scramble. Most of our permit approvals come back within 2–3 weeks, well ahead of when installation is needed on a typical build schedule.

What if HOAs push back on visible panels?+

Washington law generally protects a homeowner’s right to install solar, even in HOA communities. If an HOA raises concerns during construction, we can provide a compliance summary and connect you with resources that address common objections before they become a buyer issue.

Ready to Add Solar to Your Next Project?

Tell us about your build and we’ll get back to you with a fixed-price plan.

By submitting this form, you agree to receive email and phone communications from Solphos. Please note that all services are subject to schedule availability.

Completed new-construction home ready for rooftop solar in Western Washington

Ready to Add Solar to Your Next Project?

Tell us about your build and we’ll get back to you with a fixed-price plan.

Solphos

Our mission is simple. Lower the cost of residential solar. We’ve removed all sales and sales commissions to make this a reality. The same equipment, at a better price. Solar made easy.

Contractor License: SOLPHL*767DA

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