Kelso, WA Solar Installers: Solar Panel Installation Since 2010
Sunbridge Solar installs home solar in Kelso and across Cowlitz County. We pull the City of Kelso or Cowlitz County building permit and the Washington L&I electrical permit, file the Cowlitz PUD interconnection, and put the panels on in two to three days.
- Installing since 2010
- L&I registered, bonded & insured
- 10-yr workmanship · 25-yr product warranties
- 2–3 days on site
Who installs solar in Kelso, WA?
Sunbridge Solar does. Our own crew comes up from Washougal — we are a Southwest Washington company, not a national sales operation that subcontracts the roof work, and Kelso’s mix of valley-floor streets and hillside homes is a design problem we like.
- Registered, bonded and insured in Washington. Contractor registration SUNBRSL882NF and electrical contractor license SUNBRSL857CK, both active with the Department of Labor & Industries.
- A track record you can look up. We are a licensed Washington contractor with more than 120 permitted installs in Clark County’s public records since 2017, and we install in Cowlitz County under the same license, the same crew and the same two warranties.
- Two warranties, kept separate on purpose. Ten years on our workmanship, 25 years on the panels and equipment from the manufacturer.
- No-pressure sales. A written quote, then the decision is yours.
Check us before you call us
Our Washington credentials
- Contractor registration SUNBRSL882NF — active
- Electrical contractor license SUNBRSL857CK — active
- Bond and liability insurance on file with L&I
- 120+ permitted installs in Clark County’s public records since 2017
- Energy Trust of Oregon verified
Both numbers are on every quote we write.
Which parts of Kelso do you serve?
All of them. The one thing that changes from one address to the next is who issues your permit: inside city limits, the City of Kelso Building Department issues the building permit and Washington L&I issues the electrical permit; outside it, Cowlitz County issues the building permit and L&I still handles the electrical. We check the address before we quote so there are no surprises.
Inside Kelso city limits
City of Kelso building permit + L&I electrical permit
- Downtown & the riverfront
- South Kelso
- West Kelso
- The hillside east of I-5
Good to know: the City takes applications through its Online Permit Center, and we submit the whole package for you.
Kelso addresses in Cowlitz County
Cowlitz County building permit + L&I electrical permit
- Rose Valley
- Lexington
- Carrolls
- Out the Coweeman
Nearby towns: Longview, Castle Rock, Kalama, Woodland — or see every Washington town we serve.
Is your Kelso home a good candidate for solar?
Most Kelso homes are. Four things decide it: the roof — its direction, its pitch and how much life it has left — the shade on it, the size of your electrical service, and how much power you actually use. None of them depend on your zip code, and all four get checked on the first visit, before anyone talks about price.
Usually a yes
What we look for
- A roof plane facing south, east or west that the trees leave clear for most of the day.
- A composition or metal roof with ten or more years left. The panels are warrantied for 25, so the roof under them should not be the thing that fails first.
- A 200-amp service — or an electrical panel with room for a solar breaker.
- A bill worth cutting. A heat pump, an EV, a well pump or a shop is usually what puts a home in the middle of the 4 to 10 kilowatts we install most.
Still worth a look
None of these is an automatic no
- A shaded or wrong-facing roof. A ground mount or a shop roof often out-produces it, and the trench goes in the quote rather than turning up later.
- An older 100-amp panel. We check it on the first visit and price any upgrade in writing before you sign anything.
- A roof near the end of its life. We will tell you to replace it first rather than charge you to take the panels off and put them back.
- An HOA. Washington law (RCW 64.38.055) stops an outright ban; reasonable rules on placement and appearance go into the design from the start.
The only way to know for certain is to have someone look. We map a year of shade, check the service panel, size the system to your own Cowlitz PUD bills rather than to the roof, and put a written number in front of you. No charge and no obligation.
What does a solar installer charge in Kelso?
The price depends on system size, your roof and whether you add a battery — not on your zip code. Most Kelso homes land in the middle of the 4 to 10 kilowatts we install most; a house with a heat pump or an EV in the driveway pushes toward the top of that range. Two things keep a Kelso quote simple:
No sales tax on the system or the labor
Washington exempts 100% of state and local sales tax on solar systems up to 100 kW, including installation labor, through 2029 (RCW 82.08.962). One exemption certificate at purchase, filed by us.
No rebate to chase
Cowlitz PUD does not offer a solar rebate and Washington has no state credit, so the number on the quote is the number you pay. The federal residential credit ended for systems placed in service after December 31, 2025 — see what changed.
For cost by system size, run your bill through the Washington solar calculator or read our Southwest Washington solar cost guide. Then request a written quote.
Checked September 2026. Source: Washington Department of Revenue; RCW 82.08.962.
What permits does a Kelso solar install need?
Inside city limits, two: a building permit from the City of Kelso and an electrical permit from Washington L&I. The City takes applications through its Online Permit Center, and we prepare and submit the package.
City of Kelso building permit
What we submit through the Online Permit Center
- Site plan and roof plan showing the array, fire-access pathways and clearances
- Electrical plan with rapid shutdown and system labeling
- Manufacturer spec sheets for the panels, inverter and racking
- Structural engineering when the roof or the array calls for it
Kelso Building & Planning, 203 South Pacific Avenue, 360-423-9922 — open Monday to Thursday. We deal with them, not you. Outside city limits, the permit comes from Cowlitz County Building & Planning through its online Accela portal.
Washington L&I electrical permit
The City does not issue electrical permits
- The electrical permit and the inspection go through Washington L&I
- We pull it under our own electrical contractor license and schedule the inspection
- The passed inspection goes to Cowlitz PUD to start your interconnection
On the hillside? Kelso’s east-side hills mean some roofs face the wrong way and some lots have the slope to make a ground mount work. We look at both before we quote.
Checked September 2026. Sources: City of Kelso Building Department; Cowlitz County Building & Planning; Washington L&I.
How does Cowlitz PUD net metering work in Kelso?
Every home in Kelso is on Cowlitz PUD, and the PUD net-meters systems up to 200 kW. The power you send to the grid is banked as kilowatt-hour credits against your own later use; the summer surplus carries you through the dark months.
The Cowlitz PUD process
What happens after the electrical inspection
- Interconnection application filed by us after the L&I electrical inspection, with the one-line diagram and equipment specs
- Application fee $100, non-refundable — included in your price
- Systems up to 200 kW qualify; the PUD may charge for any transformer or meter upgrade it finds necessary during review
- Unused credits are zeroed out every March 31
No PUD solar rebate. The PUD does not publish a review time, so we chase the application for you. Engineering: (360) 501-9546.
Why we size to your usage, not your roof
The March 31 reset changes the math
Surplus you bank in July is worth full value in January, but anything still unused on March 31 goes to the utility without compensation. So we size a Kelso system to a year of your actual bills rather than to every square foot of south-facing roof. An oversized array looks impressive and gives value back to the PUD.
Our post on Washington net metering explains the math.
Checked September 2026. Source: Cowlitz PUD net metering page; RCW 80.60.030.
Does solar work on a Kelso roof — valley or hillside?
Usually, yes, and the two halves of Kelso ask different questions.
The valley floor
Open sky, older roofs
The flat streets between the Cowlitz and the freeway get clear sky most of the day, so shade is rarely the problem. The roof and the panel are: many of these houses were built before 1970, so we check the roof’s remaining life and the electrical service on the first visit and tell you plainly if either should be dealt with first.
The hillside
Orientation decides it
On the hills east of I-5 a roof that faces the wrong way, or sits under mature firs, may not be the best place for the panels. We map a year of sun first, and where the lot allows it a ground mount on the clear side of the slope can out-produce the roof. A battery is the add-on people ask about most, for the outages that come with wind along the river.
Panels run on daylight, not heat. A cool, bright Kelso afternoon is a good solar afternoon, and the rain keeps the panels clean.
How long does a Kelso solar install take, start to finish?
The panels go on in two to three days. Start to finish, from first call to switch-on, plan on ten to fourteen weeks.
Consultation, design and a written quote
Your roof, your shading and a year of your electric bills, then system size, equipment, warranty terms and price on one page.
Permits, install and inspection
City of Kelso or Cowlitz County permit plus the L&I electrical permit, then two to three days on site, then the electrical inspection.
Utility interconnection and switch-on
Cowlitz PUD reviews the interconnection application and sets the net meter. The PUD does not publish a timeline, so we follow it up until you can switch on.
How does Sunbridge Solar compare to a national solar company in Kelso?
The panels are the same. What differs is who does the work. Most national companies that advertise in Kelso sell the system and subcontract the roof and the wiring, so the people who quote the job are not the people who install it. Sunbridge Solar designs, permits and installs with our own crew, under our own Washington electrical license.
Sunbridge Solar
One company from the site visit to the warranty call
- Our own crew, our own licenses. Contractor registration SUNBRSL882NF and electrical contractor license SUNBRSL857CK — the install is not handed to a subcontractor.
- We do the paperwork. We pull the City of Kelso or Cowlitz County permit and the L&I electrical permit and file the Cowlitz PUD interconnection ourselves.
- Two warranties, both in writing. Ten years on our workmanship, 25 years on the panels and equipment.
- A local address. 421 C Street in Washougal — the same people answer the phone in year eight.
Checking a national quote
Four things worth confirming in writing
- Whose crew is on the roof — the company on the contract, or a subcontractor hired for the day?
- Whose electrical license the permit is pulled under, and who meets the L&I inspector.
- Who files the Cowlitz PUD interconnection and follows it up — or whether that is left to you.
- Whether the price is a cash price or a financed one with dealer fees rolled into it.
How do I choose among solar companies in Kelso?
Kelso sits right on I-5, so it gets pitched by solar companies from Portland to Seattle, and some of the national ones sell here and subcontract the roof work. Four questions separate them quickly.
Are you licensed, and can I check?
Every Washington contractor has an L&I registration number and an electrical license number. Ours are SUNBRSL882NF and SUNBRSL857CK.
Who does the roof work?
Ask whether the crew on your roof works for the company on the contract. Ours does, and it drives here from Washougal.
What are the two warranties?
Workmanship and product are different things. Get both in writing, with the years.
How did you size this?
Cowlitz PUD credits reset every March 31, so an oversized system gives value back to the utility. An installer who pushes a bigger array than your bills support is selling panels, not savings.
We’re happy to be compared on all four
Ask us the same questions. We’ll put our answers in writing with your quote.
What Kelso customers say
Real Google reviews from homeowners across Kelso, Cowlitz County and the rest of Southwest Washington.
Kelso solar FAQs
The questions Kelso homeowners ask us most, answered plainly.
It depends on system size, roof type and whether you add a battery, so we quote every home individually. There is no sales tax on the equipment or labor for systems up to 100 kW through 2029, and no rebate to apply for afterward. Run your bill through our Washington solar calculator for a first number.
For most homes with a reasonably clear south-, east- or west-facing roof, yes. On the valley floor the roof’s age decides more than the weather; on the hillside it is orientation and shade. We check before we answer for your house. Our Washington solar guide covers what to expect.
Yes. Inside city limits, a building permit from the City of Kelso and an electrical permit from Washington L&I. Outside city limits, a Cowlitz County building permit plus the L&I electrical permit. We prepare and submit all of it.
No. Washington law (RCW 64.38.055) stops HOAs from prohibiting solar panels on your own property. They can set reasonable rules on placement and appearance, and we design to them.
Not in cash — in kilowatt-hour credits at full value against your own later use, banked until the March 31 reset. Cowlitz PUD net-meters systems up to 200 kW and charges a $100 application fee, which we include in your price.
Yes. Battery backup for outages and a Level 2 EV charger can go in alongside the solar, with the panel and wiring sized so the three work together.
The panels are the same; the crew is not. We design, permit and install with our own crew under our own Washington electrical license (SUNBRSL857CK), pull the City of Kelso or Cowlitz County permit and the L&I electrical permit ourselves and file the Cowlitz PUD interconnection, and answer the warranty call from our shop in Washougal. Before you sign with anyone, confirm whose crew will be on the roof and whose license the permit is pulled under.
Two to three days on your roof. Start to finish, including permits and the utility’s meter swap, plan on ten to fourteen weeks.
Ready to go solar in Kelso?
Request a free, no-obligation quote and we’ll drive up from Washougal, look at your roof and put a real number in writing.
Sunbridge Solar | 421 C St Ste 5a, Washougal, WA 98671 | 360-313-7190