Pricing and estimating

How to price solar jobs

Solar jobs are priced per watt of system size. Build that number from your own equipment, labor, soft costs, sales cost, and overhead, then price adders such as panel upgrades and batteries separately.

A project engineer in a hardhat and safety vest uses a rugged tablet beside steel wall framing.
Capture field information where the work happens, then route it to the people who need it. AI-generated illustration.

To price a solar job, size the system in watts, add up the direct costs (modules, inverters or microinverters, racking, electrical balance of system, labor, permits, interconnection fees, and engineering), add customer acquisition cost and overhead, then divide by one minus your target margin. Divide the sell price by system watts to get price per watt, the number customers and lenders compare. Price site-specific extras, such as a main panel upgrade, trenching, or battery storage, as separate adders so one system price does not hide very different jobs.

For a market reference point, EnergySage's cost page (updated June 30, 2026) says residential systems average about $2.60 per watt before incentives, based on its marketplace quotes. Treat that as a check on your number, not as your price. Your costs and your market set the real figure.

Pricing methods solar contractors use

  • Price per watt. The standard for residential and small commercial. One rate per watt for the base system, often tiered by system size because fixed costs spread across more watts on bigger systems.
  • Base price plus adders. Base price per watt covers a standard composition shingle roof and a simple electrical tie-in. Adders cover tile or metal roofs, steep pitches, multiple arrays, ground mounts, trenching, main panel upgrades, critter guards, and batteries.
  • Line-item bid. Commercial and public projects are usually bid line by line, often against a schedule of values with progress billing.
  • Subcontract install rates. Installers working for sales companies are often paid per watt installed, with separate rates for adders. Know your full cost per watt before you accept one.
  • Service pricing. Repairs and troubleshooting use a trip charge plus hourly or flat rates.

Step by step: building the price per watt

  1. Size the system. Start from the design: module count times module wattage gives DC system size in watts.
  2. Price hardware. Modules, inverters or microinverters, racking and attachments, wire, conduit, disconnects, and monitoring from current distributor quotes.
  3. Price labor. Crew hours for racking and modules, plus the electrician's hours for the tie-in. Track hours per watt by roof type from your own jobs.
  4. Add soft costs. Design, engineering stamps, plan sets, permit fees, interconnection application fees, inspections, and the office time to chase them.
  5. Add customer acquisition. Sales commissions, lead costs, and marketing. On many residential jobs, this is one of the biggest lines.
  6. Add overhead and profit. Spread overhead per watt or as a percentage of direct cost, then set margin. See how to calculate construction overhead rate.
  7. Add financing cost if you sell loans. Some loan products charge the installer a dealer fee. Know it and price it before you quote.

Worked example: an 8 kW rooftop system

This is a made-up example to show the math. The costs are placeholders, not market prices. Use your own distributor quotes, crew rates, and fees.

Say a homeowner needs 20 modules at 400 watts each, an 8,000-watt (8 kW) system on a single composition shingle roof, with microinverters and a simple tie-in to an existing main panel.

Example solar estimate (placeholder costs)
LineBasisCostPer watt
Modules20 x 400 W$3,600$0.45
Microinverters and monitoring20 units$3,200$0.40
Racking, attachments, flashingLot$1,200$0.15
Electrical balance of systemLot$800$0.10
Install labor, crew and electricianCrew days$2,400$0.30
Design, plan set, permit, interconnectionLot$1,200$0.15
Sales commission and lead costPer job$2,800$0.35
Direct cost$15,200$1.90
Overhead at 15% of direct cost$2,280$0.29
Cost including overhead$17,480$2.19
Sell price at 15% net margin ($17,480 / 0.85)$20,565$2.57

Price per watt here works out to about $2.57. Notice that sales commission and soft costs together run $4,000, more than the modules. A company that cuts soft costs through faster permitting and fewer office hours per job can price lower without touching hardware.

Now add a main panel upgrade. If it costs you $1,800 in materials, labor, and permit, apply the same overhead and margin and quote it as a clear adder: $1,800 times 1.15, divided by 0.85, is about $2,435. Keeping it separate shows the customer why their price differs from a neighbor's.

The same logic applies to roof work. If the shingles are near the end of their life, panels may have to come off for a reroof in a few years. Either price a reroof into the job, quote a removal and reinstall fee in the contract, or decline the install until the roof is replaced. Leaving it vague turns into a free service call later.

Incentives and how they affect pricing

Do not build incentives into your price; show them separately and accurately. The IRS states the Residential Clean Energy Credit is not allowed for expenditures made after December 31, 2025, so 2026 cash and loan proposals should not show that federal 30 percent credit. Third-party-owned systems (leases and power purchase agreements) depend on the business clean electricity credits, which have their own deadlines tied to when construction begins and when the system is placed in service. Your financing partner sets those terms; confirm before quoting.

Overhead, burden, and margin

Labor in the estimate should be burdened cost: wages plus payroll taxes, workers' compensation, and benefits. See how to calculate labor burden. Overhead covers the office, permit coordinators, designers if they are salaried, vehicles, insurance, software, and the owner's pay.

Solar has long gaps between costs and cash. You often pay for equipment and crews weeks before a final financing milestone. Carrying that cost belongs in overhead or in the price. Decide on margin on the sell price, and know how it differs from markup: markup vs margin in construction.

Check the price after every install

Compare quoted cost per watt with actual: hardware, crew days, electrician hours, permit and interconnection costs, and how long the job waited for approvals. If tile roofs keep running over on labor, raise the tile adder. Smart Business Automator tracks estimated against actual cost by job, which makes that review routine. More in job costing and the solar software guide.

Frequently asked questions

What is a typical price per watt for residential solar?

EnergySage's cost page, updated June 30, 2026, puts the average around $2.60 per watt before incentives based on its marketplace quotes. Prices vary by state, system size, roof, and equipment, so build your own from your costs.

Why do bigger systems cost less per watt?

Fixed costs such as permits, design, interconnection paperwork, sales, and crew mobilization spread across more watts. That is why many installers tier price per watt by system size.

Should batteries be priced per watt?

Usually not. Batteries are typically priced as a separate adder per unit or per installed system, because their cost does not scale with panel watts.

Should I include the federal tax credit in my price?

No. Show incentives separately. The IRS states the Residential Clean Energy Credit is not allowed for expenditures made after December 31, 2025, so check current rules and have customers confirm with a tax professional.

Sources

  1. EnergySage: cost of solar panels
  2. IRS: Residential Clean Energy Credit
  3. IRS: One, Big, Beautiful Bill provisions
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

Get a free assessment