The front page of a residential solar proposal is a marketing document. It is built around a large savings figure, a monthly payment, and a rendering of your roof with panels drawn on it. None of those are the parts you can verify. Flip past them. The pages that matter are the itemized equipment list, the production estimate with its assumptions, the financing disclosure, and the warranty terms, which are frequently at the back, in the smallest type, and occasionally not included at all.
Read those sections first and the front page becomes easy to evaluate, because you will already know which inputs produced it. Read the front page first and everything after it gets interpreted through a number you have started believing. This sounds like a small trick. It is the single most useful habit for reading these documents, and it costs you nothing but the order you turn the pages in.
A proposal should tell you exactly what is being installed: which components, how many, and which models. High-efficiency panels and a premium inverter are not equipment specifications, they are adjectives. Without specifics, two quotes cannot be compared against each other, because a difference in price might reflect different hardware, different quantities, a different mounting system, or nothing at all.
Ask for the itemized list in writing. If it does not arrive, treat that as information rather than an obstacle. A company that will not tell you what it intends to bolt to your roof for the next couple of decades has made a decision about what it wants you to be able to check. You do not need to argue about it. You need to notice it and weigh it.
The estimated production in a proposal is a model output, not a measurement. It rests on assumptions about your roof's orientation and pitch, the shading around it, how the model handled soiling and system losses, and what the array layout actually is. Ask which assumptions were used, and ask to see the month-by-month breakdown rather than only the annual figure that gets quoted at you.
The monthly view matters especially in Utah. Winter days are short, sun angles are low, snow can rest on the array, and valley inversion cuts the light that reaches your roof. An annual total, spread evenly across twelve months in your head, is not what your meter will see. Ask specifically how the winter months were modeled and whether snow and soiling losses were included or quietly assumed away.
Any savings figure depends on what your utility charges you for power and on how it credits power you export back. Those terms belong to your utility, they can change over time, and the terms available to new systems are not necessarily the terms somebody remembers from a few years ago. Nobody selling you a system controls any of it, however confidently they describe it.
So do this before you sign. Call your own utility, or read their current published terms, and confirm how exported power from a new residential system is credited today and what happens to those terms over the life of a system. Then ask the installer which assumptions their savings figure used. If the two do not match, that savings figure is not describing your house.
A cash purchase, a solar loan, a lease, and a power purchase agreement can all produce a similar-looking monthly figure while being fundamentally different arrangements. Ownership determines who can claim available incentives, who is responsible for maintenance, what sits on your property and belongs to whom, and, the one people discover late, what has to happen when you sell the house.
The proposal should state the structure plainly. If it shows a monthly payment without saying clearly whether you own the equipment at the end, that is your first question, asked in writing. With financing, also ask whether the payment shown assumes you will apply an incentive back to the principal, because that assumption is often built in silently and changes what you pay if you do not do it.
Door-to-door canvassing, a discount that expires tonight, a manager who happens to be nearby and can approve something special, a claim that several neighbors already signed: these are techniques, and in Utah they have been used heavily enough that most homeowners recognize them on sight. A rooftop system does not become cheaper to install because you made your decision quickly.
The reasonable response is not confrontation. It is one sentence: send me the itemized proposal and I will review it this week. A company comfortable with what it is selling will do that without friction. A company that will not has told you its offer depends on you not having time to compare it, and that is far better to learn before you sign than after.
An itemized equipment list, the production estimate with its assumptions and a monthly breakdown, the full financing or agreement terms including any fees, every warranty term with a duration and a responsible party attached, and a written statement of what happens to the price if your roof or electrical panel turns out to need work.
Enough to see a pattern, which usually means more than one and rarely means many. The value is not in collecting numbers, it is in comparing itemized documents. Two fully itemized proposals will tell you more than five front pages with savings figures printed across them.
Then you cannot compare their proposal, and you can say exactly that without accusing anyone of anything. Ask once, in writing, for the itemized list and the production assumptions. The response you get back is itself a reliable signal about how the rest of the relationship is likely to go.
Twelve months of usage and the age of your roof covering are all we need to begin.