Short answer: if your asphalt roof is under 12 years old and structurally sound, install solar over it. If it's 15+ years old, replace the roof first — pulling solar panels for a re-roof costs $2,500–$4,500 and adds weeks of downtime. Tile and metal roofs are different — those usually outlast the panels.
The roof-life-vs-panel-life problem
Modern solar panels are warrantied for 25 years. Standard 3-tab asphalt shingle in Vegas heat lasts 15–20 years. Architectural asphalt: 20–25. Tile: 50+. Metal: 40–60. The math is simple: if your roof can't outlast the panels, you'll be paying to remove and reinstall the array mid-life. That's the avoidable cost.
The decision matrix I use
- 0–8 years old, asphalt: Install solar. Roof and panels age together fine.
- 9–12 years asphalt: Inspect carefully. If granules are intact and no soft spots, install.
- 13–17 years asphalt: Strongly recommend re-roof first. The window where it's still cheap to replace is closing.
- 18+ years asphalt: Replace first. Non-negotiable on any system I install.
- Any age tile (concrete or clay): Install solar. Tile outlasts panels. Mounting hardware exists for both.
- Any age standing-seam metal: Install. Best roof type for solar — clamp-on mounts, no roof penetrations.
What re-roof + solar actually costs
In Vegas, a 2,200 sq ft asphalt re-roof runs $9,000–$15,000 depending on tear-off complexity. Doing it before solar adds zero coordination cost. Doing it after solar (because the roof failed in year 14) means a $3,500–$4,500 panel removal and reinstall on top of the re-roof. Plus 2–4 weeks without your system producing.
A real Henderson story
I had a client in 2023, original 2002 build with a 21-year-old asphalt roof. Wanted solar fast. I told him to re-roof first. He pushed back — said the roof "looked fine." I walked the roof with him, showed him the granule loss and one soft spot near a vent. He re-roofed for $11,200, then we installed an 8.6 kW system. Total project ran 5 weeks. Two years later: zero issues. Had he installed first, he'd have been pulling that system in 2027 or 2028.
What I check on a roof inspection
- Granule loss in gutters and on the slope
- Soft spots (deck rot under shingles)
- Flashing around vents, chimneys, valleys
- Underlayment age and condition where visible
- Existing leaks or staining in the attic
If anything fails, I won't install. It's not just my warranty — it's the insurance reality covered in this post.
The "skip the inspection" scam
Some installers skip the roof inspection to close the deal. Then in year 9 the roof fails, the homeowner files an insurance claim, and the carrier denies it because solar was installed over a compromised substrate. I've seen this twice. The Insurance Information Institute has general guidance on roof condition affecting claims.
Tile-specific notes for Vegas
Most Summerlin and Henderson homes are tile. Two install styles: tile hooks (lift the tile, attach the hook to the deck) or tile replacement (swap tiles for solar tile mounts). I default to tile hooks — less invasive, no aesthetic change. Re-roofing tile every 30–50 years is the rule, so panels usually go on first and stay.
What to ask installers
- Will you provide a written roof condition report before quoting?
- What's your workmanship warranty on roof penetrations? (Industry standard: 10 years.)
- Do you have a roofer partnership for combined re-roof + solar projects?
- If a leak develops near a panel mount in year 6, who handles it — you or the roofer?
Common mistakes
Installing on a 16-year-old roof to "save money now." Picking a roofer and a solar installer separately and getting stuck in the middle when something leaks. Choosing the cheapest mounting hardware to save $400 — flashings are not where you cut costs.
Bottom line
Old roof + solar is fine if "old" means under 12 years on asphalt or any age tile/metal. If you're past that line, replace first. The numbers work better and the integration is cleaner. Get a quote — I'll inspect the roof and give you the honest "install now" or "re-roof first" answer before we discuss panels.