Solar Installation: cost, timeline & decision guide
Independent answers on cost, materials, financing, insurance, and what to ask contractors — before you spend.
- Typical cost
- $15,000–$35,000
- Timeline
- 1–3 months including permits
- Lifespan
- 25–30 yrs panels; 10–15 yrs inverter; 10–15 yrs battery
- ROI
- Break-even in 7–12 years; lifetime savings $20k–$70k
- DIY?
- Not recommended
- Permits
- Yes — electrical permit and utility interconnection approval.
$3.00/W before incentives; $2.10/W after federal credit
What affects price
- • System size (kW)
- • Roof orientation & shading
- • Panel & inverter brand
- • Battery storage
- • Local incentives
Materials & options compared
Solar ownership options compared
| Option | Typical cost | Lifespan | Best for |
|---|---|---|---|
| Cash purchase | $15k–$35k | 25–30 yrs | Maximum lifetime savings; best for long-term owners |
| Solar loan | $0 down; 6–10% APR | 25–30 yrs | Want ownership without upfront cash |
| Lease | $0 down; fixed monthly | Lease term | Short-term owners who want zero risk (lower savings) |
| PPA (Power Purchase) | $0 down; per-kWh rate | PPA term | Rarely the best deal — read escalator clause |
| + Battery storage | $10k–$20k add | 10–15 yrs | Outage protection, time-of-use arbitrage |
How to plan this project
Plan your solar project step-by-step
- 1Pull 12 months of utility bills
Real annual kWh usage is the only honest sizing input. Avoid contractor 'estimates'.
- 2Assess your roof
If your roof has <10 years left, reroof first. Removing/reinstalling panels later costs $3k–$8k.
- 3Model savings, not 'offsets'
Net metering rules vary widely. NEM 3.0 (CA) and similar policies have changed the math — ask for your state's current rules.
- 4Get 3 quotes with same modeling
Compare $/W installed, production guarantee, and warranty length — not flashy 25-year savings projections.
- 5Verify federal credit eligibility
30% Investment Tax Credit applies to system + battery + electrical upgrades when paid same year.
- 6Schedule install + interconnection
Install is 1–3 days. Utility interconnection ('permission to operate') often takes 4–8 more weeks.
DIY vs. professional
Not recommended.
Even with skilled DIYers, permits and inspections almost always require licensed work for plumbing, gas, and major electrical.
Repair vs. Replace
A rough framework — confirm with a licensed pro.
- • Issue is isolated
- • System is < 70% through its life
- • Repair cost < 30% of replacement
- • Repeat failures
- • System is > 80% through its life
- • Energy / safety upgrades available
Financing considerations
Federal 30% Investment Tax Credit (through 2032), state incentives, solar loans, PPAs (avoid in most cases), cash.
See financing options →Insurance & warranty
May need to update dwelling coverage. Most homeowners policies cover panels at no extra cost up to a coverage limit.
Compare protection →- Federal 30% Investment Tax Credit through 2032 (drops 26% in 2033, 22% in 2034).
- State rebates and SRECs in NJ, MA, IL, MD and others — sometimes $5k–$15k.
- Property-tax exemption for solar in 35+ states.
CA — NEM 3.0 substantially reduced payback without battery; battery storage essentially required for good ROI. TX/AZ/NV — high sun + low panel cost = fastest payback. NE/Mid-Atlantic — SRECs supplement panel production revenue.
Common mistakes to avoid
- Leasing instead of buying when staying long-term
- Ignoring roof age (reroof first if <10 yrs left)
- Not modeling true savings vs. your actual usage
- Oversizing past your net-metering cap
Questions to ask contractors
- What's the production guarantee (kWh/yr)?
- Who handles permits and interconnection?
- What's the panel warranty?
- How are repairs handled?
- Is the install crew in-house or subbed?
Glossary
Common terms you'll hear from contractors.
Glossary
- kW vs kWh
- kW measures power (system capacity); kWh measures energy (what your bill charges for). A 6 kW system in a sunny area produces ~9,000 kWh/year.
- Net metering
- Utility policy that credits you for excess solar power exported to the grid. Rules vary widely by state and utility.
- Inverter
- Converts DC from panels to AC for your home. String inverters are cheaper; microinverters perform better with shading.
- ITC
- Federal Investment Tax Credit — 30% of total system cost claimed in the install year. Non-refundable but rolls forward.
- Production guarantee
- Installer promise of minimum kWh/year. Real guarantees pay you cash if not met.
Estimate your project cost
Use our free calculator to see a realistic range for your home.
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Frequently asked questions
How much does solar cost in 2025?
Average installed cost is $3.00 per watt before incentives, or about $18,000 for a typical 6 kW system. The 30% federal tax credit drops effective cost to ~$12,600.
How long until solar pays for itself?
Most US homeowners reach payback in 7–12 years. Battery-required markets (like CA under NEM 3.0) lean closer to 10–14 years.
Is solar worth it without battery?
Yes in most states with full net-metering. In NEM 3.0 California and similar policies, a battery is usually required for reasonable ROI.
How long do solar panels last?
Panels carry 25-year production warranties and typically still produce 80%+ at year 30. Inverters last 10–15 years and are the most likely component to need replacement.
Does solar increase home value?
Owned solar adds ~$15,000 average to home value per Zillow research. Leased solar can complicate a sale and sometimes reduces value.
Should I lease or buy solar?
Buy if you'll stay 7+ years and can use the tax credit. Lease only if you can't use the credit and want zero risk.
Is solar work worth it?
It depends on condition, how long you'll stay, and whether the project addresses safety or efficiency. Break-even in 7–12 years; lifetime savings $20k–$70k.
Should I get multiple quotes?
Yes — at least three. Compare line items, not just totals.
How do I avoid being upsold?
Bring our contractor question checklist and a clear budget. Decline add-ons until you've checked them at home.
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Estimates and guidance are educational. Always confirm with a licensed local professional before making decisions.