Solar panels on a tile roof: what to know first

Solar works on clay and concrete tile roofs. It costs more to install than on shingles, and the bigger question is usually the underlayment beneath the tile, which can wear out decades before the tile itself. The Tile Roofing Industry Alliance says tile roofs “can last 50 to 100 years or more” (TRI Alliance). The waterproof sheet under them doesn't. Since panels sit on the roof for 25 years or more, what's under the tile today decides whether you'll be paying to take them off halfway through.

Tile is everywhere in Southern California, from older Spanish-style homes to newer tract homes. So it's worth knowing which kind you have, how it's handled, and what to ask before anyone climbs up.

Clay, concrete, or “Spanish”?

“Spanish tile refers to the style of the tile, not the material,” as Solar.com puts it, and many homeowners who think they have clay actually have concrete (Solar.com). The difference matters for solar:

• Concrete tile comes flat or in S and W profiles and is the easier tile to work on. Concrete roofs usually look more uniform in color.
• Clay tile, the classic barrel or S shape with natural color variation, is brittle. Installing on clay is generally “far more expensive” than on concrete (Solar.com), because crews work slower and break more.
• S-tile and other curved profiles make mounting harder than flat tile, since the mount has to clear the hump and still seal at the low point.

Not sure which you have? A clear photo of a few tiles near the gutter can help an installer tell. The check asks your roof material for exactly this reason.

The three ways panels get mounted on tile

On shingles, a flashed mount bolts through the roof. Tile can't take a bolt or a load, so the mount has to reach past it to the deck, be sealed where it passes through the underlayment, and come back up through or around the tile.

The experts don't fully agree, which is a good reason to ask your installer why they chose their method. SolarReviews recommends a double-flashed approach over hooks on clay, because hooks can rattle and crack the tile, and advises against comp-outs (SolarReviews). Solar.com, by contrast, describes comp-outs as needed for clay and other fragile roofs (Solar.com). Replacement mounts are the newest option. IronRidge's Knockout Tile, for one, is a replacement base with its own flashing (IronRidge), and a distributor listing says it works on flat, S or W tile without grinding (Greentech Renewables).

Broken tiles, and who pays for them

Some breakage is normal. SolarReviews notes that tiles are brittle and that “there's a good chance a few tiles will break” once people walk the roof (SolarReviews). One California installer says crews commonly budget for 5% to 15% breakage, at about $3 to $15 per replacement tile, and that matching a discontinued tile can cost more than the tile itself (NRG Clean Power).

Before you sign, get these in writing:

• Who replaces broken tile, and is it included in the price or billed later?
• Will they bring spare tiles, or source matching ones if your tile is discontinued?
• Does the workmanship warranty cover leaks at every mount, and for how many years?
• Will a roofer or the solar crew handle the tile work?

If your garage or side yard has leftover tiles from the original job, keep them. They're likely the closest match you'll find.

What tile adds to the cost

Tile installs cost more because the crew works slower and spends more labor hours on the roof (SolarReviews). We couldn't find a reliable statewide figure for the premium on a new install; it depends heavily on tile type, roof pitch and method. Ask the installer to show the tile work as its own line, so you can compare bids fairly.

The clearer numbers are for taking panels off and putting them back, which is what you pay if the roof needs work after solar goes on.

The same source estimates tile adds about $1,000 to $2,000 to a typical California removal and reinstall, before any broken tiles, and notes the work needs a C-46 (solar) or C-10 (electrical) licensed contractor, not just a roofer (NRG Clean Power). The CPUC lists “roughly how much will it cost to remove and re-install the panels if I need to replace my roof in the future” as a question to ask before you sign (CPUC).

Replace or re-underlay first?

The CPUC's advice is simple: “If you plan to replace your roof soon, you should replace it before installing a rooftop solar system” (CPUC). On a tile roof, “replace” often doesn't mean new tile.

Underlayment and flashings are usually the first parts of a tile roof to fail (BuildingAdvisor). Eagle Roofing, a major concrete tile maker, notes that sometimes “it may just be the underlayment that needs replacing,” and that a lift and re-lay, where the existing tile goes back down over new underlayment, can fix it (Eagle Roofing). A reserve-study engineer who tracks California community roofs puts the typical useful life of a tile roof here in about the 30-year range, driven by the underlayment, and expects about 5% tile breakage on a re-lay (Association Reserves).

That's why the check asks how old your roof is. Panels stay up for decades, so a roof in its last few years usually gets work first. If you tell us your roof is over 20 years old, your estimate flags it so the installer looks closely. New underlayment under just the array area, which NRG Clean Power puts at about $3,000 to $8,000, is one option to ask about.

Fire code pathways shrink the usable roof

California's fire code keeps clear paths on the roof so firefighters can reach and work on it. That limits where panels go, on any roof type. Temecula's 2026 solar submittal checklist, built on the 2025 California codes, sums up the statewide rules (City of Temecula):

• Ridge setback. 18 inches clear on both sides of the ridge if the array covers 33% of the roof area or less, 36 inches if it covers more. With indoor fire sprinklers the cutoff rises to 66%.
• Pathways. No fewer than two pathways, one on the street side and one running from the low edge to the ridge.
• Bedroom windows. A 36-inch path from any bedroom window that opens onto a roof plane.

On a small or chopped-up tile roof, these setbacks can cost you a few panel spots. Local amendments exist, so your installer should design to your city's rules. The solar calculator shows roughly how much roof area your bill calls for, which helps you see whether space will be tight.

Questions to ask a tile-roof installer

• Is my tile clay or concrete, and which mounting method will you use? Why that one?
• How old is my underlayment, and would you recommend a lift and re-lay under the array first?
• Who does the tile work, and how are broken tiles handled and paid for?
• What does your warranty cover for leaks at the mounts, and for how long?
• About what would it cost to remove and reinstall the panels if the roof needs work later?
• Which fire setbacks did you design to, and how many panels did they cost me?

Check any installer's license at the CSLB license lookup. If you're weighing how to pay for the system once the roof is sorted, see our lease vs buy guide. And if you want to know what happens after you send your details, here's how the check works.