You know your solar adds value.You can't prove how much. Until now.
Every other line on the CMA has a comp. Solar doesn't. WattWorth gives it one — a defensible number built from over 16 data points, run through our proprietary engine, generating your report in seconds.
Solar is the line on the listing nobody can defend.
Every other agent says "solar adds value." You show it.
A documented number, the buyer's questions answered, escrow de-risked — that's a listing presentation the seller remembers, and a reason to choose and refer you.
The cheapest insurance on the deal
One solar question that stalls escrow, one buyer credit you didn't need to give, one offer that walks — any of them costs thousands more than the report.
Ownership structure is leverage — if you present it right
Owned, financed, leased, and PPA solar each carry value differently. Get the number right for each, and it's a negotiating point. Get it wrong, and it's a liability.
The appraisal won't save you
Fannie Mae, Freddie Mac, and FHA exclude leased and PPA systems from appraised value entirely. Owned systems get counted inconsistently. If the number's going to exist, you're the one who has to bring it.
A leased system doesn't have to sink the sale.
Buyers see an assumed PPA or lease payment and hear "long-term commitment," not "locked-in rate." That hesitation costs you offers. WattWorth shows what the payment actually buys — a locked rate while the utility's keeps climbing — and turns a liability into leverage.
The contract rate is fixed. The utility's rate isn't — and hasn't been for years.
- We calculate what the remaining term actually costs against projected utility rates, not a hypothetical.
- A number the buyer's agent can hand their client, instead of a payment they're being asked to just trust.
Three steps. One defensible number.
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01
Send the invite
Email your seller a WattWorth link. Pay for the report up front as a value-add, or let the seller cover it. They complete the online questionnaire the same way they'd complete any other disclosure.
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02
The report comes back in seconds
WattWorth's proprietary engine runs the answers and emails the valuation report to the seller, you, and anyone else on your team — as a PDF and a link to the online version.
See a sample report → -
03
Put it in the listing
Attach the report to the listing packet and reference the number in the description. Now the solar has a documented value on day one — before the buyer's agent asks, before the appraiser shrugs, before escrow has a reason to stall.
Over 16 data points. One proprietary engine. No AI guessing — a real calculation, every time.
Solar valuation, answered.
How much value does solar add to a home?
It depends on four things: whether the system is owned, financed, leased, or on a PPA; which net-metering program it's on and how many years of that program remain; the equipment and its age; and whether the installer still stands behind the warranty. There is no standard comp, which is why most listings say "solar adds value" without a number. WattWorth calculates a specific dollar figure for the specific system, with the factors behind it shown.
Do appraisers include solar panels in a home appraisal?
Only sometimes. Under Fannie Mae, Freddie Mac, and FHA guidelines, leased and PPA systems are excluded from appraised value entirely. Owned or fixture-financed systems can be included, but only where paired solar sales exist in the local market, and the treatment is inconsistent. WattWorth's report is a defensible good-faith estimate for the listing and negotiation; it does not replace a licensed appraisal.
Does a leased or PPA solar system hurt a home sale?
It doesn't have to. Buyers hear "long-term commitment" and hesitate, which costs offers. WattWorth models the lease or PPA on its own terms and shows the buyer's agent what the payment actually buys: a fixed rate while the utility's rate keeps rising, plus the savings over the remaining term. That comparison turns a perceived liability into a reason to close.
How does WattWorth calculate the value of a solar system?
WattWorth's proprietary engine runs over 16 data points through a fixed set of rules. System size and install date, ownership structure and financing terms, the utility's actual rate data by district, the net-metering program and its transition timeline, equipment and warranty status, and the installer's current standing are just some of them. A loan balance, set against a documented system value, becomes a negotiating term — who pays it off and how much of the value is reflected in the price — instead of a liability the seller just eats at closing. A lease or PPA is modeled around assumption value, because buying it out forfeits the financing company's system warranty and production guarantee — the manufacturer's equipment warranty stays, but the coverage most buyers are actually relying on does not. The same inputs always produce the same number.
Is WattWorth an AI estimate?
No. WattWorth is a rules-based valuation engine, not a language model making its best guess. Every report comes from the same calculation, the inputs are shown, and the result is repeatable. That's what makes the number defensible when a buyer's agent or appraiser pushes back.
What if the solar installer is out of business?
The valuation still runs. WattWorth's installer database includes companies that have closed or been acquired, such as SunPower and Titan Solar Power, and installer status is a direct input to the number. A bankruptcy filing changes the answer to the warranty question; it doesn't leave it unanswered.
How long does a solar valuation report take?
Seconds. The listing agent emails the seller a WattWorth link, the seller completes a short online questionnaire the same way they'd complete any other disclosure, and the report is emailed to the seller and the agent as a PDF plus a link to an online version. No site visit is required.
What does the WattWorth report include, and what does it cost?
The report is $79 and includes three parts: the Valuation Report and Summary with the defensible number and the analysis behind it; a Verification and Transition Checklist showing what a buyer, agent, or lender confirms before relying on the number; and Buyer's Next Steps for the new owner's first year with the system. The agent can pay up front as a value-add, or the seller can pay.
Which utilities and states does WattWorth cover?
California, Florida, Arizona, Nevada, and Texas. Utility rate data is pulled by the specific utility, not a statewide average: in California that means SDG&E, SCE, PG&E, SMUD, LADWP, Riverside Public Utilities, and Anza Electric Cooperative; in Florida, FPL, Duke Energy Florida, TECO, JEA, and OUC; in Arizona, APS, SRP, and TEP; in Nevada, NV Energy; and in Texas, the retail provider and delivery utility on the bill. Each state's net-metering and financing rules are modeled on their own terms.
Does WattWorth keep up with changes in solar law?
Yes. Disclosure-relevant changes are tracked in every state WattWorth serves — California's AB 942 and Florida's net-metering rules are two examples — so an agent isn't left explaining a rule that already shifted.
WattWorth is built by SolarHub, a solar repair and installation company based in California. The models come from the same equipment questions we've had to answer standing at a customer's electrical panel — not from a spreadsheet built at a distance.