Replace Roof Before Solar? How to Decide in 2026

If your roof will not last as long as solar panels, about 25 to 30 years, replace it before or at the same time as you install solar. Doing the two together means you do not pay later to take the panels off, re-roof and put them back. If your roof is new or has decades left, you can go ahead without re-roofing.

That is the short version of what the U.S. Department of Energy (DOE) advises, and it lines up with what shingle manufacturers say in their own technical bulletins. Below is how to judge your roof’s remaining life, what the warranties do and don’t cover, and the questions to settle with your roofer and solar installer before you sign. If you are still working out whether solar pays off at all, start with our guide to solar payback without the federal tax credit.

The Core Comparison: Roof Life vs. Panel Life

DOE puts the two lifespans side by side:

• Roofs last “anywhere from 20 to 50 years depending on the materials used.”
• Solar panels “last about 25-30 years.”

The question is not how old your roof is, but how many years it has left compared with how long the panels will be on it. A simple test:

These bands are a planning rule of thumb, not an industry standard. Shingle maker GAF is stricter. Its bulletin on solar over GAF shingles says: “GAF recommends that the shingles over which PV panels will be installed be less than 5 years old for optimal longevity.”

Worked example. Say a roofer estimates your 15-year-old asphalt shingle roof has about 10 more years. Panels installed now would be expected to run 25 to 30 years. The roof would need replacing roughly a third of the way into the panels’ life, so the array would have to come off and go back on at least once. That is the case for re-roofing first.

Why Doing Both at Once Can Save Money

DOE’s guidance is that “it can often save you money if you install solar at the same time as a roof replacement.” The main saving, in our reading, is avoiding a later job to take the panels off and put them back after a new roof. In a 2021 DOE article, a solar program official cited an NREL estimate that combining the projects could save homeowners an average of about $4,000. That figure was published in 2021 and is not a price quote for your home; removal and reinstallation costs vary with system size, roof type and local labor.

A later remove-and-reinstall job generally means:

1. The solar installer shuts down and disconnects the system.
2. Panels and racking come off and are stored.
3. The roofer replaces the roof.
4. New mounts and flashing go in, and the system is reinstalled and tested.
5. Depending on your town and utility, a new permit, inspection or utility notice may be needed.

The system produces nothing while it is off the roof. Ask your installer for a written price and timeline for this work now, even if you never need it.

What Shingle Warranties Do and Don’t Cover

The two shingle makers whose bulletins we reviewed allow solar on their roofs, but the coverage is narrower than many homeowners expect.

• GAF (Technical Advisory Bulletin TAB-R-131): “Solar panels will not impact coverage under the GAF’s limited warranties.” But if there is a shingle problem, “it is the owner’s responsibility to have the solar panels removed at the owner’s sole expense” so GAF can inspect or repair. The bulletin also says to follow the racking maker’s instructions and roofing industry guidelines, keep the array clear of skylights and vent pipes, and not install in areas prone to ice damming.
• Malarkey (technical bulletin, March 2020): allows compatible solar panels on warrantied roofs, but “the solar/PV equipment, related flashings, and installation are not covered by a Malarkey warranty,” and “damage resulting from installation of a solar/PV system does not constitute a manufacturing defect.”

Other shingle brands have their own rules. Look up your manufacturer’s current solar bulletin before installing, and keep a copy with your roof paperwork.

Who Covers Leaks Around the Panels

Because shingle warranties cover defects in the roofing product, not the solar mounts (Malarkey says so explicitly), leaks at roof penetrations usually fall under the solar installer’s workmanship warranty. That warranty is only as good as the company behind it; our guide to what happens if your solar installer goes out of business explains what still works if the company disappears.

Questions to Settle Before You Sign

• How old is the roof? If you don’t know, DOE suggests checking local building permit records.
• How many years does it have left? Get a roofer’s written estimate, not just the solar salesperson’s opinion.
• Will the installer require roof work? Make sure any needed repairs are in every quote so you can compare them fairly; see how to compare solar quotes.
• What does the workmanship warranty cover for roof penetrations, and for how long? Get it in writing.
• What does removal and reinstallation cost? Get a written price now.
• What does your shingle maker’s solar bulletin require? Share it with both the roofer and the solar installer.
• If re-roofing, who installs the mounts and flashing? Agree on who is responsible if a mount leaks.

A Note on Tax Credits

The federal Residential Clean Energy Credit (Section 25D) no longer applies to expenditures made after December 31, 2025, according to the IRS. Older advice that pairs a re-roof with the 30% solar credit does not apply to systems installed in 2026. Check for state or utility incentives in your area.

Sources and verification