Solar Panel Installation Cost Calculator
Build a pre-incentive planning estimate for rooftop solar. Enter system size in kW, roof difficulty, and region. Federal or utility incentives are not subtracted here—ask installers for net cost after credits.
Estimated solar installation cost (pre-incentive)
Enter your project details and calculate to see a planning estimate.
This is a planning estimate, not a contractor quote. Actual costs vary by location, home condition, material availability, permits, and project complexity.
Planning rates for cost year 2026 (national baselines × state regional factors). Not a contractor quote.
Main cost factors
System size (kW)
Equipment and labor scale with array size; most homes land in the mid single-digit to low teens kW.
Roof / install difficulty
Simple roofs cost less per kW than complex or steep roofs that need more staging.
Region
Labor markets and permitting timelines move installed $/kW relative to national averages.
Cost table
| Item | Low | Typical | High |
|---|---|---|---|
| 4 kW system (pre-incentive) | $8,000 | $12,000 | $18,000 |
| 6 kW system (pre-incentive) | $12,000 | $18,000 | $27,000 |
| 10 kW system (pre-incentive) | $20,000 | $30,000 | $45,000 |
National average explanation
U.S. residential rooftop solar is commonly planned in installed dollars per kW before incentives. The calculator multiplies that planning band by system size, roof tier, complexity, and region.
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More resources
Frequently asked questions
Does this include tax credits or rebates?
- No. Results are installed cost before incentives. Apply federal, state, or utility programs separately when you compare written proposals.
What does roof difficulty change?
- Steep, cut-up, or multi-story roofs raise labor and safety costs versus a simple single-story install.
Is $/kW a good planning metric?
- Yes for budgeting. Final design still needs production estimates, electrical upgrades, and interconnection details from a qualified installer.
Methodology & estimate disclaimer
Production model: installed $/kW × system kW × roof tier × complexity × region (pre-incentive).
Actual costs vary by location, home condition, material availability, permits, and project complexity. Read our methodology, the national cost bands table, editorial policy, and disclaimer. Planning provenance uses the internal model and, where listed, public datasets for context—not invented third-party bid averages.
Planning sources
- Home Cost Atlas national planning model v1 (version: v1) — Modeled national planning ranges used for cost guides and seed CostRecords. Values are planning estimates synthesized for budgeting context, not observed contractor invoices or bid samples.
- Home Cost Atlas planning baselines v1 (version: v1) — Internal baseline spreads (low / typical / high) by project category. Intended for calculator scaffolds and aggregation fallbacks; not a dataset of paid jobs.
- BLS Occupational Employment and Wage Statistics (construction trades) (version: OES May 2025 release cycle) — Public wage context for residential construction and installation occupations. Labor-market context for regional multipliers—not job-level bid samples.
- EPA — Lead Renovation, Repair and Painting (RRP) program — Compliance context for paint/disturbance on pre-1978 homes—not remodel bid averages.
Public datasets supply labor and market context for the planning model. They are not aggregated contractor invoices or bid samples.
Cost year: 2026 rate book · Data version: hca-national-model-v1+cluster-context-2026 · Last reviewed: July 26, 2026