Do not compare solar proposals until you know the roof's condition and remaining life, your own electricity use, the utility's current interconnection and compensation rules, the ownership structure, insurance impact and the full contract price. Verify current tax-credit eligibility with the IRS; ordinary roofing work usually does not become eligible simply because panels sit above it.
Independent inspection, repair needs, remaining life and panel-removal risk
Twelve months of bills, shade, orientation, equipment and utility rules
Price, fees, escalation, warranty, transfer, service and cancellation terms
Planning ranges and scenarios are starting points, not quotes or promises. Replace them with current documents and property-specific evidence before spending money.
The roof and the solar system share one calendar
A salesperson may be focused on panel production. A roofer should be focused on the surface carrying the system. If the roof is near replacement, installing first can create a future bill to remove and reinstall equipment before roofing work begins.
Ask an independent qualified roof professional to document condition, repairs, flashing, ventilation and remaining-life concerns. Get the solar contractor's written process and price structure for removal and reinstallation. The cheapest sequence is usually the one that avoids doing expensive access work twice.
- Keep roof and solar opinions independent
- Ask who owns roof penetrations and leak response
- Put removal and reinstallation terms in writing
Start with 12 months of your bills—not a neighbor's panels
Collect a full year of electricity use and note changes ahead: an electric vehicle, heat pump, pool, new family member or work-from-home schedule. A system sized for last year's house can be too small or unnecessarily large for next year's life.
Separate dollars from kilowatt-hours. Rates, fixed charges, time-of-use plans and credits can change the bill even when production estimates are accurate. Ask the installer to show every assumption and model a less-perfect production year, not only the sales case.
Shade moves; utility rules can move too
Trees, roof planes, chimneys, neighboring structures and seasonal sun angles affect production. Ask for a site-specific shade and layout analysis and understand whether trimming depends on trees you control.
Then verify interconnection, export compensation and current rate rules with the utility or regulator—not only the proposal. The value of an exported unit of electricity may differ from the price of a unit you buy, and fixed charges may remain after solar.
The federal credit is not a roof coupon
IRS guidance explains which residential clean-energy expenses may qualify and how to claim the credit. It also notes that traditional roof trusses and shingles generally do not qualify merely because they support panels, while certain solar roofing products may be treated differently.
Tax rules, eligibility and your ability to use a credit can change or depend on facts. Keep receipts and installation records, and confirm the current rule with the IRS and a qualified tax professional. Do not let an estimated credit erase the full contract price from your decision.
Cash, loan, lease and power agreement are different products
A low monthly payment can hide a long term, dealer fee or interest cost. A lease or power-purchase agreement can introduce escalators, service responsibilities and transfer steps when the home is sold. Read the entire agreement and compare the total obligation, not just the first monthly number.
Ask what happens if equipment underperforms, a component manufacturer disappears, the roof leaks, monitoring stops or the buyer of your home does not want the agreement. A warranty is useful only when you understand who provides it, what it covers and how service begins.
Call the insurer before signing
Tell the home insurer what equipment and ownership arrangement you are considering. Ask about coverage, limits, roof requirements, wind or hail considerations, documentation and whether a separate endorsement is needed. If you do not own the system, confirm each party's responsibilities.
Finish with a three-quote comparison using the same system size and assumptions. Verify contractor credentials, permits, cancellation terms and complaint history through the appropriate state and local channels. The best proposal should remain understandable after the sales meeting ends.
Take this list with you.
Work from the evidence you already have, mark what is missing and verify the important assumptions before you commit.
- 01Get an independent roof-condition opinion
- 02Collect 12 months of electricity use and rate details
- 03List future loads such as an EV or heat pump
- 04Review site-specific shade and layout assumptions
- 05Verify utility interconnection and export rules directly
- 06Compare total cash, loan, lease or agreement cost
- 07Confirm current tax-credit rules with the IRS
- 08Ask the insurer about coverage and roof requirements
- 09Put removal, service, transfer and cancellation terms in writing
A few things worth knowing before you start.
Should I replace my roof before installing solar?
It depends on roof condition, remaining life, repair history and the removal-and-reinstallation terms. Get an independent roof assessment before deciding the sequence.
Does the federal solar credit cover a new roof?
IRS guidance generally excludes traditional roofing and structural components that primarily serve a roofing function. Certain solar roofing products may qualify differently. Verify the current rule for your situation.
Will solar eliminate my electric bill?
Not necessarily. Production, consumption, weather, fixed charges, rate design, export compensation and system performance all matter. Review a site-specific estimate and current utility rules.
Is a solar loan always better than a lease?
No. Compare ownership, total payments, fees, interest, tax treatment, maintenance, transfer and exit terms. The best structure depends on the household and contract.
Check the original guidance.
- U.S. Department of Energy — Homeowner's guide to going solar↗
- Internal Revenue Service — How to claim a residential clean energy tax credit↗
- Internal Revenue Service — Residential clean energy credit FAQs↗
- Federal Trade Commission — Solar power for your home↗
Sources provide the current national or program context reviewed on the date above. Contracts, loan terms, prices, eligibility, codes and property conditions still require transaction-specific verification.
