Should You Replace Your Roof Before Solar?
Should you replace your roof before solar in California? Roof age rules of thumb, panel removal costs, who pays if solar comes off, and HOA and utility notes.
A solar salesperson is at your door, or on your calendar, and the numbers look good. Then a question comes up that nobody seems to want to answer: what about the roof?
Should you replace your roof before solar in California? Often, yes, if your roof is older or near the end of its life. Solar panels can stay on a roof for decades. If the roof under them wears out first, you pay to take the panels off, redo the roof, and put the panels back. This guide explains how to decide, what to ask, and what to check before you sign with a roofer or a solar company.
What does California say about replacing your roof before solar?
The California Public Utilities Commission publishes a Solar Consumer Protection Guide that solar providers in the major utility territories must give customers. It says plainly: if you plan to replace your roof soon, you should replace it before installing a rooftop solar system. It also suggests that if your roof "isn't in great condition," community solar may be a better fit.
Source: California Public Utilities Commission, California Solar Consumer Protection Guide
The guide also lists questions to ask your solar provider, including:
- Does my roof need to be replaced before installing solar panels?
- If yes, how much will that cost, who will do it, what is their license number, and is there a roof warranty?
- What steps will you take to make sure my roof will not leak?
- Roughly how much will it cost to remove and reinstall the panels if I need to replace my roof in the future, including inspection fees?
Source: California Public Utilities Commission, California Solar Consumer Protection Guide
Roof age rules of thumb before solar in California
There is no state rule for how old is "too old" for solar. But you can compare the age of your roof to typical lifespans. Inspector reference charts put them roughly here.
| Roof type | Typical life expectancy | What it means for solar |
|---|---|---|
| Asphalt shingles, 3-tab | About 20 years | If it is more than halfway through, get a roof opinion first |
| Asphalt shingles, architectural | About 30 years | Same question, later in life |
| Clay or concrete tile | 100+ years for the tile | Underlayment beneath often wears out much sooner |
| Metal | 40 to 80 years | Often a good long-term base for panels |
| Flat membranes (TPO, EPDM, modified bitumen) | About 7 to 30 years, by type | Check age and seams before mounting |
Source: InterNACHI, Standard Estimated Life Expectancy Chart for Homes
A useful way to think about it: ask whether your roof will last as long as you plan to keep the panels. If the honest answer is "probably not," replacing the roof first is often the cheaper path over time. Our guide to signs you need a new roof helps you judge condition, not just age.
Tile roofs need extra care
Many California homes have tile roofs. The tile itself can last for generations, but the underlayment under it does not. Installing solar on tile also means removing or cutting tiles to set mounts, and tile can crack when walked on. If your tile roof has original underlayment from decades ago, ask a roofer whether it should be replaced before panels go up.
Who pays if solar has to come off for a re-roof?
If you need a new roof after solar is installed, someone has to take the panels down, store them, and reinstall them. Who pays depends on your paperwork.
- If you own the system, you usually pay for removal and reinstall, unless your contract or a warranty says otherwise.
- If you lease or have a power purchase agreement, the agreement usually controls who can touch the panels and what it costs. Many require that their own crew or an approved installer do the work. Read the section on roof work before you sign.
- Warranty risk. Removing panels or mounts with an unapproved crew may affect solar or roofing warranties. Ask both companies in writing.
Ask for a written estimate of removal and reinstall costs up front, as the CPUC guide suggests. That number helps you compare "roof now" against "roof later."
Doing roof and solar together
Some solar companies offer to replace the roof as part of the solar job. That can be convenient. It can also mean one company is handling work outside its main trade. Ask who will actually do the roofing.
- Check the California contractor license. Roofing in California is the C-39 classification, and solar contractors often hold a different classification. Look up the license on the CSLB website. See what a C-39 roofing license is and how to check a contractor's license.
- Confirm they are licensed and insured. See does your roofer need workers' comp.
- Get two warranties in writing. One for the roof, one for the solar system, and a clear answer on who handles a leak around a panel mount. See how long a roofing warranty should be.
- Check salespeople too. The CPUC guide notes that salespeople must be registered as home improvement salespersons with the CSLB, with limited exceptions.
Source: CSLB, license classifications; California Public Utilities Commission, California Solar Consumer Protection Guide
HOA and utility notes
A few other things can shape timing.
- HOAs. California's Solar Rights Act limits how much an HOA can restrict solar, but HOAs can still require an application and reasonable rules. Your HOA may also have rules on roof materials and colors for a re-roof. Check both before you schedule work.
- Permits. Both a re-roof and a solar install usually need permits from your city or county. See do you need a permit to replace a roof in California.
- Utility rules. Your utility sets the rules for connecting solar and for billing credits, and those rules have changed in recent years. Ask your utility, or check the CPUC guide, for the program that would apply to you. Removing and reinstalling an existing system may also involve your utility, so ask before roof work starts.
- Fire and energy code. California has rules for roof fire ratings and cool roofs that can affect material choice. See cool roof and Class A roofing in California.
Source: California Civil Code §714 (Solar Rights Act); California Public Utilities Commission
A simple way to decide
- Find out how old your roof is and what it is made of.
- Get an independent roof inspection, from someone not selling the solar. Our list of questions to ask a roofer helps.
- Ask the solar provider for the removal and reinstall estimate in writing.
- Get roofing bids and compare them. See how to compare roofing bids and how much a new roof costs in California.
- Read every contract before you sign, including the cancellation notice. See what should be in a roofing contract.
Where ConFacts fits
Deciding whether to replace your roof before solar in California often comes down to who you trust to do the roof. ConFacts builds sourced background reports on California C-39 roofing contractors from public records, like CSLB license status, workers' comp and disciplinary history, and turns them into a 0 to 100 Trust Score. Your first report is free. We take no money from contractors. We show you the record, you make the decision.