Solar Installation Estimate Software for Contractors (2026)

Solar proposals are the most complex in residential contracting — system sizing, shade analysis, utility rates, federal tax credits, and sometimes battery storage. Solar estimate software structures all of it into a proposal your client can understand, trust, and sign.

What solar contractors need in estimate software

• System size (kW) — based on annual kWh usage and panel wattage
• Panel schedule — manufacturer, wattage, count, and roof placement
• Inverter type — string inverter, microinverters, power optimizers
• Battery storage option — size (kWh), brand, backup load calculation
• Federal ITC and state incentives — 30% federal tax credit in 2026

Solar pricing quick reference (2026)

• Residential system (6 kW, installed) — $15,000–$22,000 before incentives
• Residential system (10 kW, installed) — $22,000–$32,000 before incentives
• After 30% federal ITC — reduce by 30% ($4,500–$9,600 savings)
• Battery storage add-on (10 kWh) — $8,000–$15,000 installed
• Per-watt installed cost (US average) — $2.50–$3.80/W
• Annual savings (6 kW system, average utility rate) — $1,200–$2,000/year
• Payback period (after incentives) — 6–10 years

How to estimate a solar installation

1. Pull 12 months of utility bills — calculate annual kWh usage
2. Size system: annual kWh ÷ (peak sun hours × 365) = system kW needed
3. Calculate panels: system kW ÷ panel wattage = panel count
4. Select inverter based on shading and roof complexity
5. Apply ITC and state rebates to show net cost and payback in the proposal

Solar estimating pitfalls

• Not verifying roof condition — a 20-year-old roof needs replacement before solar install
• Over-sizing based on peak usage without checking if NEM 3.0 or export limits apply
• Not including structural engineering cost if roof needs reinforcement

Use the ConstruMate solar calculator to build system-specific proposals with panel schedules, incentive breakdowns, and payback timelines — giving homeowners the clarity they need to say yes.

Start your free solar estimate →