The short answer
- If your roof will need replacing within about 10 years, replace it before installing solar. Panels last 25 years or more.
- Removing and reinstalling panels for a later reroof typically costs a few thousand dollars or more (contractor estimates; prices vary widely).
- A roofer who touches the solar needs a C-46 or C-10 license, or a B license when the job includes other trades.
- Check how a reroof affects your roof and solar warranties before you sign either contract.
Plan the roof and the solar together
- Ask the solar installer to inspect the roof and say in writing how many years it has left.
- If a reroof is due, a contractor holding both roofing and solar licenses, or a B license for a combined job, can coordinate both (B&P Code ยง7057).
- Tile roofs need more care (and cost) to mount and to remove and reinstall than composition shingle.
If you already have solar
- Get a written price for removal and reinstallation from a licensed solar contractor, and ask whether new mounting hardware is included.
- Keep your interconnection paperwork: reinstalling the same system doesn't change your tariff, but expanding it can (NEM 2.0 rules).
- Leased systems: the lease company usually must handle removal; ask before scheduling the roofer.
Fire setbacks
California's residential code requires 36-inch access pathways on the roof and setbacks at the ridge, which limits how many panels fit. Your installer designs to these; a crowded roof may mean a smaller system than you expected.
Checked against official sources on Oct 1, 2026. Sources are linked in the text. Not legal, tax or financial advice.