Should You Replace Your Roof Before Installing Solar?
Solar panels outlast many roofs. Matching the two lifespans saves paying to take the panels off later.
Re-roof first if the roof has less than about ten years of life left. Panels typically stay up for decades, and re-roofing under them later means paying to remove, store and reinstall the array on top of the new roof. A roof with plenty of life left, such as a tile roof with recent underlayment or a young shingle roof, can take the panels now.
Get a roof inspection before you sign the solar contract, so the decision rests on the roof's actual condition rather than its age alone.
Before or after solar at a glance
| Roof condition | Recommendation | Why |
|---|---|---|
| Shingle roof 15+ years old in Valley heat | Re-roof first | Its remaining life is likely shorter than the array's |
| Shingle roof under about 10 years old | Install solar now | The roof should outlast a large part of the array's service |
| Tile roof with underlayment near 25–30 years | Relay the underlayment first | Panels would sit over the part that fails next |
| Flat roof with ponding or open seams | Repair or replace first | Water problems under racking are harder to reach |
| Any roof in a fire zone being replaced | Re-roof first, Class A | Covering rules apply to the new roof |
Why does roof age matter for solar?
A solar array is planned to produce power for decades. Architectural shingle in Valley heat typically lasts 20 to 30 years. Putting a long-lived array on a roof near the end of its life means the roof fails first, and the panels have to come off before it can be replaced.
What does removing and reinstalling panels involve?
An electrician or the solar installer disconnects the system, the panels and racking come off and are stored, the roof is replaced, new flashed mounts go in, and the array is reinstalled and recommissioned. The solar company prices that work, so ask for the figure in writing before you decide to wait.
How do the warranties overlap?
Panel and inverter warranties come from the solar side; the roof's material warranty comes from the roofing manufacturer and the workmanship warranty from the roofer. Penetrations made by the solar installer are usually that installer's responsibility, so ask who warrants the mounts and the flashing around them.
Does a new roof under solar need to meet cool-roof rules?
The cool-roof requirements apply to the re-roof itself when more than half of the roof is replaced. The 2025 Energy Code lets roof area covered by building-integrated solar skip the reflectance minimums; ordinary rack-mounted panels sit above a roof that still meets them.
What we recommend
Book the roof inspection first. If the roof needs replacing within roughly ten years, re-roof before the panels go on and have the mounts flashed into the new roof; if not, install solar now and keep the inspection report with the solar paperwork.
Related pages
- Roof replacement
- Roof inspection
- How long Valley roofs last
- Flat roofs
- Roof replacement in Woodland Hills
- Roofing FAQ: materials
Sources
Questions We
Hear About This
As a rule of thumb, a roof with less than about ten years of life left should be replaced first. In Valley heat that often means a shingle roof past 15 years.
The solar installer prices it, and it varies with the size of the array. Get the figure in writing before deciding to wait on the roof.
Yes, with tile-specific mounts and flashing. If the underlayment under the tile is near 25 to 30 years old, relaying it before the panels go on avoids lifting them later.
Yes, usually on tilted racking. Fix ponding and open seams first, because problems under the racking are harder to reach once the array is installed.
Usually the solar installer, who makes them. Ask both the solar company and the roofer to put their responsibilities for mounts and flashing in writing.
Get an Answer for
Your Roof
The guide covers the rules; a free inspection covers your roof. A roofer walks it and gives you a written quote with photos.
(818) 600-6707