When people ask what solar costs, they usually mean the panels. The panels are the cheap part. Most of your bill is the install: the labor, the permits, the racking, the electrician, and the company's cost of finding you in the first place.
In 2026 a residential system runs about $2.50 to $3.50 per watt installed before incentives, which is the same range we use in the solar cost calculator. Multiply by system size and you get a number that surprises people in both directions.
A typical 6 kilowatt system lands near $18,000 before incentives at $3 per watt. The 30% federal tax credit takes roughly $5,400 off that, so your net is closer to $12,600. Bigger roof, bigger number. The per-watt price already includes installation, so there is no separate labor invoice waiting to ambush you.
| System size | Gross cost (~$3/W) | After 30% credit |
|---|---|---|
| 4 kW | $12,000 | $8,400 |
| 6 kW | $18,000 | $12,600 |
| 8 kW | $24,000 | $16,800 |
| 10 kW | $30,000 | $21,000 |
Those are planning figures at $3 per watt. Your real quote depends on the factors below.
The National Renewable Energy Laboratory tracks the cost breakdown every year, and the pattern holds: hardware (panels, inverter, racking) is a minority of a residential system's price. The rest is what the industry calls soft costs. Permitting and inspection. Sales and marketing. Installer overhead and profit. Labor. That is why two homes with identical panels can get quotes hundreds of dollars per kilowatt apart.
It also explains why the cheapest panel brand rarely changes your total much. You are mostly buying a crew, a permit, and a warranty.
A turnkey install covers more than bolting panels to your roof. It includes the site assessment and design, the permit application with your city or county, the mounting hardware, the electrical work and the inverter, the interconnection paperwork with your utility, and the final inspection. Crews are on the roof for one to three days. The paperwork around it can take weeks.
The federal Residential Clean Energy Credit cuts 30% off your qualifying installation cost, and that 30% includes the labor, not just the equipment. It runs through 2032, then steps down. You claim it on IRS Form 5695. We walk through the details in the tax credit guide, and you can estimate yours in the tax credit calculator.
Paying cash gives you the lowest total and the full tax credit. A solar loan spreads the cost out but adds interest, so the lifetime number climbs even while the monthly payment feels easier. Leases and power purchase agreements ask for little or nothing up front, but the company owns the system and keeps the tax credit, so you trade the incentive for convenience. If that 30% matters to your math, and on an $18,000 system it is more than $5,000, owning is how you keep it.
Prices for the same roof can vary by thousands. When the bids come in, look past the headline number. Compare the equipment tier, the production estimate in kilowatt-hours, the workmanship warranty, and how each installer handles permitting and interconnection. A slightly higher bid with a longer labor warranty and a realistic production estimate often costs less over twenty years than the cheapest quote on the pile.
Yes. The installed price per watt is turnkey: it covers the panels, the inverter, the racking, the electrical work, the permit, and the labor. There is no separate labor bill on top of a normal quote.
The crew is usually on your roof for one to three days. The longer wait is everything around it: design, permitting, and the utility interconnection approval, which together can run several weeks to a couple of months.
Yes. The Residential Clean Energy Credit covers labor for on-site preparation, assembly, and wiring, not only the hardware. Keep your itemized contract so you can document the qualifying costs.
Most of a system's price is soft costs: permitting, overhead, and labor, not the panels. A low bid can mean a thinner warranty or a less experienced crew. Compare workmanship warranties and equipment, not just the bottom line.
Chris Terry edits Encore Editorial and writes across business, consumer markets, and whatever topics benefit from clear, sourced prose. He is based in San Diego and Lincoln, California, and can be reached through the contact page.