Too much starts at about $3.50 per watt, the median price US homeowners actually paid in cash for solar in 2024 (Lawrence Berkeley National Laboratory). Cross $4.00 per watt on an ordinary roof with nothing unusual in the scope and you're not looking at a premium install, you're looking at a bad deal.
TL;DR: Judge a quote on dollars per watt, never on the monthly payment. The EnergySage marketplace average is $2.60 per watt before incentives; the LBNL median cash price was $3.50. State averages run $2.13 in Florida to $3.88 in Alabama. Above $4.00 per watt without a panel upgrade, ground mount or structural work in the scope, get another bid before signing anything.
Quotes on the same roof, with the same panel model on both, can sit five figures apart. The expensive one usually isn't buying better hardware. It's paying for the salesperson who knocked on the door.
What Is a Fair Price Per Watt Right Now?
One number decides this, and it's the one most proposals bury: gross system price divided by DC watts. A 9.6 kW system quoted at $38,400 is $4.00 a watt, whatever the glossy summary page says about monthly savings.
| Benchmark | Price per watt | What it means |
|---|---|---|
| $2.13 to $2.50 | Cheapest state averages | Florida, Arizona, Texas levels |
| $2.60 | EnergySage marketplace average | What competitive shopping gets you |
| $3.00 | Soft ceiling | Fine with real complications, questionable without |
| $3.50 | LBNL national median cash price | Half of buyers paid more, half less |
| $4.00+ | Walk-away line | Assume a second quote beats it |
When we modelled that same spread for our payback assumptions piece, moving a 7.2 kW system from $2.60 to $3.50 per watt added roughly 3.5 years to break-even. No equipment choice on the proposal moves the result that far.
State averages matter more than the national figure. Alabama sits at $3.88 per watt and Florida at $2.13, so a $3.20 quote is a bargain in one and a fleecing in the other. Check your own state before deciding anything.
Where the Money Actually Goes
This is the part that reframes the question. EnergySage breaks down an average $31,135 twelve kilowatt system like this:
| Line item | Share of price |
|---|---|
| Sales and marketing | 18 percent |
| Wiring and supply chain | 18 percent |
| Solar panels | 12 percent |
| Labor, racking and sales tax | 12 percent |
| Installer overhead | 11 percent |
| Installer profit | 11 percent |
| Inverters | 10 percent |
| Permitting and interconnection | 8 percent |
Read the first and third rows together. Winning your signature costs half again as much as the panels do. That's the mechanism behind most overpriced quotes: nothing exotic, just an expensive customer acquisition channel passed straight through to the buyer.
What Justifies a Higher Price, and What Doesn't
Some quotes deserve to be dearer. A steep slate roof needs a safety setup a single-storey ranch doesn't. Ground mounts need trenching and concrete. An old 100 amp service usually needs replacing before anyone will connect an array, and that's real electrical work with a real invoice behind it.
Legitimate reasons for a higher number:
- Main electrical panel upgrade, typically $2,000 to $4,000
- Ground mount instead of roof mount
- Structural reinforcement, or a roof replacement first
- Difficult access, three storeys, or a long conduit run
- Batteries in the scope, which are a separate purchase entirely
Weak reasons, all of which deserve pushback:
- "Premium" panels with a marginally better warranty
- A 25 year monitoring subscription bundled into the capital cost
- Extended labor warranties priced like insurance policies
- Urgency framing about incentives that already expired
That last one has been everywhere this year. The federal residential credit ended for property placed in service after December 31, 2025 (IRS). Anyone still using it to rush you is either uninformed or counting on you being so.
The Financing Trap
Here's where a fair price quietly becomes a bad one. Zero-down loans usually carry a dealer fee, and that fee gets folded into the system price rather than shown as interest. The proposal still reads $2.90 a watt while the cash equivalent would have been $2.40.
So ask one question of every financed quote: what's the cash price for this identical system? If the answer is thousands lower, you now know exactly what the financing costs, and you can weigh that against a home equity line instead. A quote that won't produce a cash price is telling you something.
Does a low monthly payment ever mean a good deal? Only by coincidence. Stretch a term to 25 years and almost any price fits inside a payment that beats a utility bill. Leases and power purchase agreements are a different instrument again, with their own escalator clauses, and we compare them in the PPA versus ownership breakdown.
Summary
Convert every quote to dollars per watt, compare it against your state average rather than the national one, and treat $3.50 as the point where you're paying above the median and $4.00 as the point where you stop. Ask for the cash price on anything financed. Three written quotes cost you a fortnight and routinely save five figures, which is a better hourly rate than most people earn. For the wider price picture, see our 2026 cost breakdown and the assumptions that drive payback.