A professionally installed residential solar system in the United States costs about $20,000 to $40,000 before incentives in 2026. An 8 kW system often costs $21,000 to $28,000, while a 12 kW system can cost about $31,000 to $42,000.
EnergySage reports that a typical 12 kW residential solar installation costs $31,135 before incentives. Lawrence Berkeley National Laboratory reported a national median cash price of $3.50 per watt in 2024. These figures differ because marketplace quotes, completed project prices, system sizes and financing arrangements are not identical.
Solar Panel Installation Cost at a Glance
| Solar system | Approximate installed cost before incentives |
|---|---|
| 6 kW system | $15,600 to $21,000 |
| 8 kW system | $20,800 to $28,000 |
| 10 kW system | $26,000 to $35,000 |
| 12 kW system | $31,200 to $42,000 |
| Solar battery | Usually adds about $12,000 to $15,000 |
These estimates use a planning range of $2.60 to $3.50 per watt. Your location, roof, equipment, installer and financing method will affect the final price.
EnergySage reported an average 2026 marketplace price of about $2.60 per watt. Berkeley Lab reported a $3.50 per watt median cash price for residential systems in 2024.
How Much Does an 8 kW Solar System Cost?
An 8 kW solar system generally costs $20,000 to $30,000 before incentives. The U.S. Department of Energy's 2025 benchmark puts an 8 kW system without battery storage at $2.95 per watt, or about $23,600.
The right system size depends on:
- Annual electricity consumption
- Local sunlight levels
- Roof orientation and shading
- Utility electricity rates
- Whether you want to offset part or nearly all of your electricity use
- Whether you plan to charge an electric vehicle
How Much Does Solar Cost With a Battery?
Adding a battery usually increases the project cost by $12,000 to $15,000 before incentives. EnergySage reports an average cost increase of about $15,000.
The Department of Energy's 2025 benchmark lists an 8 kW solar system with a 13.5 kWh battery at about $36,720, compared with approximately $23,600 for an 8 kW system without storage.
A battery can provide:
- Backup power during outages
- More evening use of your own solar electricity
- Less reliance on utility electricity
- More protection where utilities offer poor compensation for exported solar power
A battery does not always provide the fastest financial payback. Many homeowners choose storage mainly for backup power or energy independence.
What Is Included in the Installation Price?
A complete solar quote usually includes:
- Solar panels
- An inverter or microinverters
- Roof mounting and racking
- Electrical wiring and disconnects
- System design and engineering
- Building permits
- Utility interconnection
- Installation labor
- Monitoring equipment
- A workmanship warranty
The Department of Energy groups solar installation costs into modules, inverters, structural components, electrical components, fieldwork and office work. Permitting, financing, customer acquisition and administration are examples of solar soft costs that also affect the price homeowners pay.
What Factors Make Solar Panels More Expensive?
System Size
Larger systems cost more overall. Their price per watt may be lower because design, permitting and administrative costs are spread across more panels.
Roof Condition and Design
A roof with multiple angles, dormers, steep sections or limited usable space usually costs more than a simple roof. A roof replacement may also be necessary before installation because solar panels can remain in service for decades.
Electrical Upgrades
The installer may recommend a main electrical panel upgrade, new wiring, a service upgrade or other safety equipment. These costs are separate from the solar panels.
Shade and Roof Orientation
Heavy shading can require more design work, optimizers, microinverters or tree trimming. East- and west-facing roofs can still produce solar electricity, but they may generate less than a well-oriented roof.
Location
Solar prices vary by state because labor rates, permitting rules, competition, utility requirements and local incentives differ.
EnergySage's 2026 data shows average quoted prices ranging from about $2.25 per watt in Texas to $3.18 per watt in Massachusetts.
Financing
A financed system can have a higher total price than a cash purchase because the contract may include loan origination fees or dealer fees.
Berkeley Lab reported a 2024 median price of $4.70 per watt for loan-financed residential systems, compared with $3.50 per watt for cash purchases.
Is There Still a Federal Solar Tax Credit in 2026?
No. The federal Residential Clean Energy Credit is not available for new residential solar property placed in service after December 31, 2025.
The Internal Revenue Service states that the 30% credit applied to qualifying property installed from 2022 through December 31, 2025. It does not apply to property placed in service after that date.
State, local and utility incentives may still reduce the cost of a 2026 installation. Potential programs include:
- State tax credits
- Utility rebates
- Local grants
- Solar renewable energy certificates
- Performance-based incentives
- Battery storage incentives
Eligibility and incentive value depend on your address, utility and installation date. Check current program rules before including an incentive in your budget.
Does Buying Solar Cost Less Than Leasing or Using a PPA?
Buying solar usually gives you the clearest long-term ownership benefit because you own the equipment after paying for it. A cash purchase also avoids loan interest and financing fees.
A solar loan reduces or removes the upfront payment, but compare the total repayment amount, not only the monthly payment. A lease or power purchase agreement may require little or no upfront cost, but the solar company usually owns the system. You then pay for electricity or equipment use under a long-term contract.
When comparing offers, review:
- Cash price before incentives
- Price per watt
- Total loan repayment
- Loan dealer fees
- Interest rate and term
- Lease or PPA annual price increases
- Battery and backup specifications
- Roof repair and electrical upgrade costs
- Equipment and workmanship warranties
- System removal or transfer terms if you sell the home
How Can You Tell Whether a Solar Quote Is Reasonable?
Calculate the price per watt by dividing the quote's cash price by the system size in watts.
For example, a $30,000 quote for an 8 kW system equals $3.75 per watt. That price may make sense for a difficult roof, premium equipment or a high-cost market. It is still worth reviewing because it is above Berkeley Lab's national cash benchmark.
Get at least three detailed quotes before signing. Make sure each quote includes the same work and equipment. A lower price that excludes permitting, a panel upgrade, roof work or required utility equipment is not directly comparable with an all-inclusive quote.
Bottom Line
For a typical U.S. home, plan for:
- $20,000 to $30,000 for an 8 kW solar system
- $30,000 to $40,000 or more for a 10 kW to 12 kW system
- $12,000 to $15,000 more for battery storage
Since the federal Residential Clean Energy Credit does not apply to new systems placed in service after December 31, 2025, compare the all-in cash price, price per watt, financing cost and available state or utility incentives.