Short Answer
If the roof is near the end of its service life, replacing it before installing a long-term solar system may make economic and logistical sense. The homeowner should evaluate both projects together.
Detailed Explanation
Solar panels typically have a service life of 25-30 years. If a roof is near the end of its service life when solar is installed, the roof may need replacement during the solar system's life — which means removing and reinstalling the solar panels, adding significant cost. If the roof is relatively new, this may not be a concern. But if the roof is 15+ years old, replacing it before installing solar can save the cost of a future solar removal and reinstallation. The homeowner should evaluate the roof's remaining service life and the solar system's expected life together. If both projects are being considered, coordinating them — new roof first, then solar — is typically the most cost-effective approach. A roofing contractor can assess the roof's condition and help the homeowner make this decision.
Why It Matters
Installing solar on an aging roof can lead to significant removal/reinstallation costs when the roof eventually needs replacement. Evaluating both projects together prevents this.
Questions to Ask Your Contractor
- ?How much service life does my roof have left?
- ?If I install solar now, will I need to remove it for a roof replacement during the solar system's life?
- ?Should I replace the roof first?