Roof replacement timing calculator
Panels last 25+ years. If your roof won't, compare replacing it now, re-roofing later around the panels, or waiting.
Lowest total cost in today's dollars
Replace the roof now, then install solar
Your roof has about 10 years left. Panels last 25+ years, so they may need to come off once.
| Option | Cost in today's dollars |
|---|---|
| Replace the roof now, then install solar | $15,000 |
| Install solar now, re-roof in about 10 years | $15,635 |
| Wait 10 years, then do both | $25,497 |
Costs are discounted to today. Waiting counts the solar savings you'd miss. Re-roofing early also gives you a new roof, which this simple comparison treats as having no extra value; in reality a new roof adds years of life, which favors replacing first when the roof is near the end.
Rule of thumb
If your roof has less than about 10 years left, replace it first. Coordinate both jobs so the roofer and installer agree on flashing and warranties, and get the roof warranty in writing.
Why timing matters
Removing and reinstalling panels for a re-roof commonly costs several thousand dollars. If your roof has less than about 10 years left, replacing it first usually costs less overall, and you avoid roof-warranty disputes between the roofer and installer.
Questions
How old is too old for solar?
If an asphalt shingle roof is more than about 15 years old, or has less than 10 years of life left, plan to replace it before or with the solar installation.
How much does it cost to remove and reinstall solar panels?
Prices vary by installer and system size. Our default assumption is $1,500 plus $0.35 per watt, about $4,000 for a 7 kW system. Get a written quote.