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Removing and reinstalling 20 panels runs $5,500 today — $6,959 by the time a 6-year-old roof dies. If the roof has under 10 years left, re-roof before the panels go on.
The line item missing from almost every solar quote: roofs and panels have different lifespans. Panels warrant 25 years; an asphalt roof installed a decade ago has 10–15 left. When the roof dies first, the panels come off and go back on — $200–300 per panel in labor plus permit and inspection, typically $1,500–6,000+ total, and more by the time it happens because labor inflates. For 20 panels that is $5,500 today, $6,959 in six years at 4% labor inflation — 22% of the original system price, and neither the panel warranty nor the power-production guarantee covers it. The decision rule is simple: under ~10 years of roof life remaining, re-roof before the solar install and this cost never exists. This calculator prices the event and gives the verdict.
Homeowners with aging roofs use it before signing a solar contract: removing and reinstalling 20 panels costs $5,500 today ($6,959 by year 6) — with under 10 years of roof left, re-roof first and the bill never exists.
Default answer: you. Panel warranties cover the panels; workmanship warranties cover the installation; neither covers a roof replacement, which is a different trade entirely. The exceptions worth hunting: some premium installers bundle one R&R event into a long workmanship warranty (get it in writing, with the company's survival risk in mind — solar installers have a high failure rate), and leased or PPA systems often put R&R responsibility on the provider since they own the hardware — read that clause specifically before signing. Insurance is the other path: if the roof replacement follows a covered event like hail, the R&R is often part of the claim — document the system and keep your install records. Absent those, this is a homeowner cost, which is exactly why the roof-age check belongs before the install.
The practical cutoff is around 10 years, but make it about payback, not round numbers: if the roof dies before the system pays back, you are stacking an R&R bill on top of an investment that has not returned yet — clearly bad. If the roof dies a few years after payback, the R&R is an annoying maintenance event, not a deal-killer. The variables that push the line earlier: tile roofs (removal is slower and breakage adds panel-adjacent costs), steep pitches, and multi-story access. The variable that pushes it later: a roofing quote bundled with the solar mobilization, where one crew visit for both trades costs less than two separate ones — some paired roofing-solar companies price exactly this. If you are near the line, get the roof inspected; a $200 inspection beats a $6,000 surprise.
Yes, and it cuts in favor of leases and PPAs for older roofs. When you own the system, R&R is your bill, full stop. Under a lease or PPA, the provider owns the hardware and most contracts assign removal-and-reinstall to them for roof work — though the details matter: some contracts cover it fully, some cap it, some charge a fee, and the remedy if the provider has gone bankrupt is nothing. So for a roof with 8–12 years left, the lease-vs-buy comparison should add this calculator's inflated cost to the ownership side before comparing. Ownership still usually wins on a sound roof — the lease discount rate is expensive — but on an aging roof with a strong R&R clause, the lease can pencil. Run both; the answer is roof-age-dependent in a way almost no comparison accounts for.