How to review a solar contract before you buy or list a home

Short answer: before you treat rooftop solar as an asset in a home sale, look at five things in the contract — what the terms say about a sale, what the system or power costs, whether the promised production is realistic, how the payment changes over time, and whether it is likely to save money over the years that remain. Get the signed agreement itself, not a summary, and ask the questions below about each area.

An owned, paid-off system is part of the house. A lease, power purchase agreement (PPA) or solar loan is a contract with payments that someone must take over or pay off at closing. The same panels can help one sale and stall another; the difference is in the paperwork.

What documents should you gather first?

Ask the seller early, ideally before the listing goes live, for: the full signed agreement with every addendum (a sales proposal is not the contract); a current statement or payoff letter; the transfer or assumption packet from the solar company or lender; production data from the monitoring app; and twelve months of electric bills.

1. Contract terms: what happens to this agreement when the house sells?

This is about how the agreement treats a future buyer. A New York Attorney General consumer guide puts the basic risk plainly: selling a home typically does not end the obligation to make the remaining payments, though some solar companies let new owners take over if they qualify.

Questions to ask:

• Can the contract transfer to a buyer, and what does the buyer need to qualify?
• Is there a transfer fee, and how much notice does the company need?
• Is there a buyout or prepayment option, and how is the price set?
• Is anything filed against the property, such as a UCC-1 fixture filing? (See our post on UCC-1 filings and closing.)
• What happens at the end of the term — removal, renewal or purchase?

2. Price: how does the cost compare with the market and the utility?

For an owned or financed system, this means what the system cost compared with typical prices for a similar size. For a lease or PPA, it means the solar rate compared with what the local utility charges.

Financed systems deserve a close look. In an August 2024 advisory, the Consumer Financial Protection Bureau warned that solar loans can include dealer fees that are rarely shown to the customer but increase the total amount borrowed. A loan balance that seems high for the system size is worth a question.

Questions to ask:

• What was the cash price, and what was the financed amount? Are they different?
• For a PPA, what is today's rate per kilowatt-hour compared with the utility's rate on the latest bill?

3. Production: does the system make the power the contract assumes?

Every savings promise rests on how many kilowatt-hours the panels produce. Panels lose output slowly; the National Renewable Energy Laboratory (NREL) puts the median at about 0.5% per year, higher in warm climates and on rooftops. A system that is underperforming by more than that usually has a cause: shading, a failed inverter, a damaged panel or an estimate that was optimistic from the start.

Questions to ask:

• What did the contract estimate for yearly production, and what did the system actually make last year?
• Is there a production guarantee, and how does the company pay if output falls short?
• Is monitoring working, and will the login transfer to the buyer?

4. Rate protection: how will the payment change over time?

For leases and PPAs, look for an escalator — a scheduled yearly increase in the payment or rate. Some contracts are flat; many rise every year. For loans and PACE financing, the question is how predictable the payment is, including any step-up if a tax-credit prepayment was expected and not made.

Here is general arithmetic for a PPA that starts at 15 cents per kWh with a 2.9% yearly escalator:

For comparison, the U.S. Energy Information Administration's September 2026 outlook puts the national average residential price at about 17.3 cents per kWh in 2025 and 18.2 cents in 2026. Utility prices rise too, but not on a fixed schedule, and local rates vary widely. Our solar rules by state pages show how each state credits exported power, which also affects the comparison.

5. Lifetime value: is it likely to save money over the years that remain?

This pulls the other four together: what the remaining payments are likely to cost versus what the same electricity would cost from the utility, using the home's actual bills where you have them. A well-built system can still cost more than it saves if the price or escalator is high.

Questions to ask:

• How many payments are left, and roughly what do they total?
• What does the home still pay the utility each month with the panels running?
• Who pays for repairs, roof work and panel removal during the term?

Who should look at the contract, and when?

Earlier is better. A transfer approval can take weeks, and a payoff or UCC-1 issue found during title review can push a closing date. Have the contract reviewed before listing or as soon as an offer comes in, and work with an experienced local real estate agent who has closed sales with solar before; they know which questions lenders and title companies will ask. AI tools can help pull terms out of a long document, but they can misread pages and tables, so check what they report against the actual contract. For legal, tax or financial questions about a specific deal, talk to a qualified professional.

RateMySolar's report card covers these same five areas in plain language. Our How we grade page explains what each grade looks at. Your first upload is free to preview, and the MLS listing fields and remarks come with the full report. The full graded report is $49.99. Reports are AI-assisted, only partly reliable, and are information, not advice.

Frequently asked questions

What documents do I need to review a solar contract before a home sale?

The signed agreement with all pages and addenda, the payment history or current statement, any production guarantee or monitoring data, the transfer or assumption packet from the solar company, and the last 12 months of electric bills if available.

Are solar panels always an asset when selling a home?

No. Owned systems often add value, but a lease, PPA or loan comes with payments and terms a buyer must take over or the seller must pay off. Whether the system helps or hurts depends on the contract.

What is a solar escalator?

A scheduled yearly increase in a solar lease payment or PPA rate, often written as a percentage such as 2.9% per year. Some contracts have no escalator.

Does selling the house end the solar contract?

Usually not. Most leases and PPAs must be transferred to the buyer or paid off, and a solar loan is normally paid off at closing or assumed if the lender allows it. The contract spells out which options exist.

How long do solar panels keep producing power?

Panels typically carry 20 to 25 year warranties and lose output slowly. NREL reports a median degradation rate of about 0.5% per year, higher in some hot climates and rooftop installs.

Is the RateMySolar report free?

Your first upload is free to preview, and the MLS listing fields and remarks come with the full report. The full graded report is $49.99.

Sources

• New York State Attorney General — Solar tips for homeowners
• Consumer Financial Protection Bureau — Solar financing advisory (Aug 2024)
• NREL — Lifetime of PV panels
• U.S. EIA — Short-Term Energy Outlook, electricity (Sept 2026)