Solar is a 25-year commitment bolted to your roof, so the condition of the roof underneath it matters enormously. Put panels on a roof that has a few years left, and when the roof fails you pay to remove the entire array, redo the roof, and reinstall everything. Get the sequence right and you avoid a large, entirely predictable cost. Here is how to decide, and what changed for 2026 that makes the math different than it was.
The rule: match the roof to the panels
Solar panels are built to last around 25 to 30 years, and they degrade slowly, losing roughly half a percent of output a year, so a panel still produces close to 90 percent of its rated power at year 25. Your roof needs to keep pace, because you do not want to replace the roof twice during the life of one solar array.
The consensus rule of thumb from the solar and roofing world:
- If your roof is under about 10 years old and in good shape, go straight to solar.
- If it has less than roughly 10 to 15 years of life left, replace it first.
- If it is over 20 years old or near the end of its life, definitely replace it before the panels go on.
A fresh architectural asphalt roof lasts around 25 to 30 years, which is a clean match for the panels’ life. If you are already close to needing a roof, doing it now, as part of going solar, is almost always the smart order of operations. Our guide on the best time to replace a roof can help you judge where yours stands.
Why the order matters: the detach-and-reset cost
Here is the concrete reason not to skip this. If solar goes on an aging roof and the roof then fails, a crew has to remove every panel, store the array, let the roofers work, and reinstall the whole system. That detach-and-reset commonly runs somewhere between 1,500 and 6,000 dollars or more depending on the system size, on top of the roof itself. It is money you spend purely because the roof and the panels were installed out of order.
Pay for a professional roof inspection before you commit to solar. A roofer can tell you how many years the roof realistically has left, which is the single fact that decides whether you roof first or go straight to panels. It is a small cost that prevents a large one.
Which roofs take solar best
If you are replacing the roof anyway, the material you choose affects the solar install:
- Standing seam metal is the most solar-friendly roof there is, because the mounts clamp onto the raised seams with no holes drilled into the roof at all. It also outlasts the panels by a wide margin.
- Asphalt shingle is the most common and the most affordable, and it works fine, but panels are mounted with penetrations that must be flashed correctly, and the roof’s shorter life means timing matters.
- Tile is durable but the hardest and most expensive to work with, since tiles often have to be removed and replaced around the mounting hardware, raising labor cost.
If you are weighing panels against integrated solar roofing, see solar shingles vs solar panels, and for the metal option, standing seam metal roof.
The tax credit changed in 2026, so plan without it
This is the part that trips people up, because most articles online are out of date. For years, homeowners who bought their own solar system got a 30 percent federal tax credit, the Residential Clean Energy Credit under Section 25D. That credit ended. Under the 2025 federal budget law, the IRS confirms that 25D does not apply to expenditures made after December 31, 2025, and an expenditure counts as made when the installation is completed.
In plain terms: a solar system a homeowner buys and has installed in 2026 does not get the 30 percent federal credit. Do the economics without it. It was also always true that the roof itself did not qualify for the solar credit, only the solar equipment, so a reroof was never the part the credit covered. Look instead at state, local, and utility incentives, which still exist in many places and vary widely, and talk to a tax professional about your own situation. This is general information, not tax advice.
Ignore the "30% off" pages for a 2026 project
A lot of solar and roofing sites still advertise the 30 percent federal credit. For a homeowner-owned system installed in 2026, that credit is gone. If an installer’s quote leans on it to make the numbers work, ask them to show you the economics without it, because that is the real math now.
Protecting your roof warranty
Mounting panels means putting holes in the roof, and done wrong that can compromise your roof warranty and start leaks. The major shingle manufacturers generally allow solar mounts without voiding the material warranty, but only if the penetrations are flashed to their specifications, ideally by a licensed roofer. Proper through-flashing woven under the shingles is what lasts. Sealant smeared on top is what fails under a few years of sun.
The practical move is to make sure a competent roofer handles or oversees the mounting and flashing, not a solar crew with no roofing background. Some companies do both roof and solar, which keeps the responsibility in one place. Either way, coordinate the two trades so the flashing and the warranties are handled correctly, rather than discovering a leak around a mount two winters later.
“Panels last 25 years. Put them on a roof that has 5 years left and you will pay to take them off and put them back. Match the roof to the array and the whole problem disappears.”
The bottom line
Get the roof inspected, and if it has less than 10 to 15 years of life left, replace it before you go solar so you never pay to detach and reset the array. Choose a roof that suits solar, standing seam metal if the budget allows, and make sure a roofer handles the mounting and flashing. And run your 2026 solar numbers without the federal credit, because it is gone. For the whole picture of timing a roof, see the best time to replace a roof.
With Hommy you post your job once and get quotes from vetted local roofers with real ratings from other homeowners, so you can get the roof right before the panels go on.
