Solar panels typically come with a 25 year performance warranty. Most asphalt shingle roofs don't come close to lasting that long. That mismatch creates a real planning problem: install solar on an aging roof and there's a good chance you'll be paying to remove and reinstall the whole system a few years later, just to get a new roof underneath it.
Why Roof Age Should Drive the Decision
The general guidance is straightforward: if your roof is more than 15 to 20 years old, or already showing signs of wear, replace it before solar goes on, not after. A roof with less than 10 to 15 years of remaining life left is a poor foundation for a system meant to sit undisturbed for 25 years or more. If your roof was installed more recently and still has plenty of life left, going solar first is perfectly reasonable.
The Real Cost of Doing It Out of Order
Removing and reinstalling an existing solar array typically runs $200 to $350 per panel. For a typical 15 to 25 panel residential system, that's an added $3,000 to $6,000 on top of whatever the roof replacement itself costs. Bundling both projects together, replacing the roof and installing solar in the same job, tends to run meaningfully less overall than doing them as two separate projects years apart, since you avoid paying for a removal and reinstall cycle entirely.
What "Detach and Reset" Actually Means
In the industry, temporarily removing solar panels so roofing work can happen underneath them, then putting them back, is called a detach and reset, often shortened to D&R. It's routine work for an experienced solar crew, involving disconnecting the electrical wiring safely, removing the panels and mounting hardware, and reinstalling everything to the original specifications once the new roof is down. Done properly, it shouldn't affect how the system performs afterward.
Who Should Do the Work: Roofer or Solar Company
This is worth getting right. Unless your roofer also handled the original solar installation, the detach and reset work generally belongs with the solar company, not the roofing crew. Many solar agreements specifically require the original installer's own licensed electricians for disconnecting and reconnecting the system, and having someone else open it up can put your solar warranty at risk. The cleanest outcome is a single point of accountability, ideally a contractor who can coordinate both sides directly, so a leak or a performance issue afterward doesn't turn into the roofer and the solar company blaming each other.
Warranty Considerations on Both Sides
Solar panels typically carry a manufacturer performance warranty and a separate installer workmanship warranty, similar in structure to how roofing warranties split between materials and installation. A proper detach and reset by a qualified installer usually doesn't affect the panel manufacturer warranty. What can affect it is unqualified handling, or a roofer's warranty explicitly excluding areas where solar was removed and reinstalled as "non-standard work." Ask both parties directly what is and isn't covered before anything comes off the roof.
If You're Going Solar in an HOA Community
If your home is in an HOA, don't assume solar needs the same lengthy approval process as a roof material change. California law gives solar strong protection: an HOA cannot ban it outright, cannot make conditions cost-prohibitive, and has to respond to a solar application within 45 days or it's automatically approved. Reasonable placement rules are still allowed, so it's worth checking those specifics, but outright refusal isn't legally an option.
The Smart Sequence
- Get a roof inspection first, even if solar is the goal, to know your roof's real remaining life
- If the roof has under 10 to 15 years left, replace it before or alongside the solar install
- Ask your roofer and solar company to coordinate directly rather than working in isolation
- Confirm in writing who handles detach and reset if it's ever needed later
- Keep documentation of both warranties in one place
Frequently Asked Questions
Should I replace my roof before installing solar panels? +
If your roof is more than 15 to 20 years old or already showing wear, yes. Installing solar on a roof that needs replacing within the next 5 to 10 years usually means paying to remove and reinstall the panels later.
How much does it cost to remove and reinstall solar panels for a roof replacement? +
Typically $200 to $350 per panel, or roughly $1,500 to $6,000 total for an average 15 to 25 panel residential system, depending on the installer and system complexity.
Who should detach and reset my solar panels, my roofer or my solar company? +
Ideally, whichever company holds the warranty and interconnection responsibility for the panels, usually the original solar installer. Many solar agreements actually require their own licensed electricians for disconnect and reconnect work.
Does removing solar panels void my solar warranty? +
Removal and reinstallation by a qualified installer generally does not affect the panel manufacturer warranty. Having someone unqualified handle the disconnect and reconnect, however, can put that coverage at risk.
Can my HOA stop me from installing solar panels in California? +
No. California Civil Code section 714 makes any HOA restriction that effectively prohibits solar panels void and unenforceable, though your HOA can still set reasonable placement rules.
Solar and a roof replacement don't have to be two separate headaches years apart. Sequenced correctly, and with the right contractors coordinating instead of working around each other, it's one project done once.