Checking Your Roof Before Solar

Rooftop solar can be a good fit for many Indiana homes, but the roof itself decides more than the sales pitch does. Before you compare quotes or financing, spend an afternoon learning what your roof can actually support. The U.S. Department of Energy's Homeowner's Guide to Solar puts it plainly: solar panels work in all climates, but some rooftops are not suitable because of age or tree cover (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). That single sentence should shape your first round of questions.

Is my roof structurally and practically suitable for panels?

Start with the obvious physical facts. The Department of Energy notes that the size, shape, and slope of your roof all matter, and that panels typically perform best on south-facing roofs with a slope between 15 and 40 degrees, though other roofs may still be suitable (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). Walk outside at several times of day and note which planes catch sun and which stay shadowed. If your roof is small, steep, or broken up by dormers and vents, a designer may need to use fewer panels or different mounting hardware, which changes the math.

How old is my roof, and when will it need replacement?

This is the question that saves the most money. The Department of Energy guide specifically tells homeowners to consider the age of the roof and how long until it will need replacement (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). Panels can last decades, but the shingles underneath may not. If your roof is near the end of its service life, the logical order is roof first, solar second, so you are not paying twice for labor and removal. Ask a roofer for a written assessment of remaining life before a solar designer finalizes a layout.

How much shade does my roof actually get?

Shade is not a yes or no condition. The Department of Energy warns that trees creating excessive shade on your roof can make rooftop panels a less ideal option (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). Morning shade from an eastern tree and afternoon shade from a western one affect production differently. Watch the roof through a full day in more than one season if you can. A qualified installer should model shade, not eyeball it, and should tell you which roof planes are worth using.

What do the numbers look like for my specific address?

General rules are a starting point, not an estimate. The National Renewable Energy Laboratory built PVWatts to estimate energy production and cost for grid-connected systems at any address, and the Department of Energy recommends it as a first tool while stressing that you should get a custom estimate from an installer (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). NREL's analyses use an average system size of 7.15 kilowatts direct current within a 3 to 11 kilowatt range (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). Run your own address through PVWatts, then compare the output to what each bidder promises for your roof.

What should I ask a solar installer before signing?

Ask about certification, roof condition, shade modeling, expected production, and what happens at the end of the agreement. The Department of Energy states that the industry-standard certification comes through the North American Board of Certified Energy Practitioners, or NABCEP, and recommends talking to certified installers (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). It also advises reading reviews carefully, avoiding pushy sales tactics, understanding your financing options, and reporting bad actors (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). Written answers beat verbal promises, especially about production and maintenance. For a deeper walkthrough, see our guide on how to vet a solar installer.

How should I think about paying for it?

Financing changes who owns the system and who claims the tax credit. The Department of Energy explains that a purchased system can be installed at a lower total cost than one financed through a loan, lease, or power purchase agreement, and that only owners can claim the federal Investment Tax Credit, while leases and PPAs typically involve no money down and lower bills but no tax benefits (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). The guide also points to DSIRE for state and local incentives and to the National Utility Rate Database for current electricity rates (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). Compare ownership models before comparing monthly payments alone. Our comparison of solar financing options can help you line up the choices.

What if my roof is not a good candidate?

You are not out of options. The Department of Energy notes that if a professional determines your roof is unsuitable, or if you do not own your home, community solar lets multiple people benefit from a single shared array, with costs divided among participants (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). That structure may fit better than forcing panels onto a shaded or aging roof. If you want to understand the Indiana version, start with our community solar basics explainer.

A simple pre-solar decision checklist

Use this table as a screening tool, not a substitute for professional inspection.

Item to check	Why it matters	What good looks like
Roof age and remaining life	Panels may outlast shingles	Written roofer assessment before layout
Shade through the day	Trees and structures cut production	Installer models shade, not guesses
Roof planes and slope	Affects layout and output	South-facing planes near 15 to 40 degrees considered
Structural condition	Mounting relies on sound framing	No active leaks or failing decking
Installer credentials	Quality and code compliance	NABCEP-certified installer, clear reviews
Financing and ownership	Determines tax credit eligibility	Ownership model chosen with eyes open
Utility and net metering rules	Shapes bill credits	Local utility rules confirmed in writing
Backup or storage needs	Batteries change cost and design	Storage decision made before signing

Where can I check the rules that apply to me?

State and utility rules vary, so verify rather than assume. The Department of Energy says net metering availability, eligible system size, rates, and bill credit design all depend on your state and electric utility, and that your local utility is a good starting point (https://www.energy.gov/eere/solar/homeowners-guide-going-solar). In Indiana, that means knowing your utility territory before you accept a production estimate.

A roof check is not a formality. It is the step that determines whether solar saves you money or creates a future bill. Inspect, ask, verify, and put the answers in writing before you sign.