If your roof is over 15 years old, combine replacement with solar installation. This saves 2 to 5 thousand dollars versus doing them separately and avoids costly panel removal and reinstallation later.
If you install solar on an aging roof, you'll need to remove panels ($2K-$4K), replace the roof, then reinstall panels ($2K-$4K). Total waste: $4K-$8K. Combining: one project, one permit, one contractor, and solar mounting is designed with the new roof structure.
Standing seam metal: solar panels clamp directly to seams — no roof penetrations. Best for solar longevity. Composite shingle: standard rail mounting with flashing — reliable and affordable. Tile: requires special tile hooks ($500-$1,000 extra) and careful handling to avoid cracks.
Average LA home (2,000 sqft): 6-8 kW system. Cost: $15K-$25K before 30% federal tax credit. Annual production: 10,000-14,000 kWh (LA gets 5.5 peak sun hours/day). Net metering with LADWP: export excess to grid, use credits at night. Typical payback: 5-7 years.
Shingle roof + 7kW solar: $25K-$40K ($10K roof + $15K-$25K solar). After 30% tax credit on solar: $20K-$33K total. Savings vs separate: $3K-$5K. One LADBS permit covers both (saves $500-$1,000 in duplicate fees). One project timeline: 2-3 weeks total.
Even if you don't install solar now, Title 24 2026 requires new roofs to be solar-ready: conduit from roof to electrical panel, reserved panel space, structural capacity verified. This makes future solar installation simple and cheap.
NP Line Design (CSLB #1105249). April 2026.
“Solar integration with roofing is a project I have managed in both directions — adding solar to an existing roof and designing a roof specifically to optimize solar performance — and the approach matters enormously. The worst scenario is a homeowner who pays for a new roof and then 2 years later has to pay again to remove and reinstall the solar panels for another roof. I always recommend coordinating roofing and solar in a single mobilization, even if the solar timeline has to shift slightly. The mobilization and labor savings almost always justify the coordination cost.”
When coordinating a roof replacement and solar installation in LA, have both the roofer and solar installer attend the same pre-construction site walk. The roofer needs to know where the solar array will sit (to prioritize that area's underlayment quality), and the solar installer needs to understand the roofing assembly being installed (for compatible mounting hardware selection). Projects coordinated this way have zero integration leaks in my experience; projects where the two contractors never spoke before install have a 15 to 20 percent flashing leak rate in my observation.
1. Installing solar panels on a roof with 10 to 12 years of remaining life, then discovering the re-roofing cost 8 years later includes panel removal and reinstallation at $3,000 to $6,000 on top of the roof cost
2. Allowing the solar installer to penetrate the roofing system with standard lag bolt mounts without requiring a roofer to be present for flashing and sealant application — this is how most roof-to-solar integration leaks start
3. Not checking whether the existing roof structure can handle the additional dead load from solar panels before installation — panels add 3 to 4 pounds per square foot, which can be significant on a roof framed to minimum loads
Solar installers who penetrate tile roofing without a licensed roofer present for the flashing work are creating leak points. Tile roofing penetrations require specific underlayment integration and sealant compatibility that most electrician-led solar crews are not trained to execute. The flashing around solar mounts on tile is a roofing trade detail, not an electrical detail.
Yes, if your roof has less than 10 years of remaining useful life. Solar panel systems last 25 to 30 years; the cost to remove and reinstall panels during a re-roof is $2,000 to $6,000 on a typical LA home. If your roof has 5 years left and you install solar, you will pay that reinstallation cost 3 to 5 years into your solar system's life. Most solar installers will evaluate roof condition before installation and flag short-life roofs.
If you are replacing your roof while keeping existing solar panels, expect a $2,000 to $6,000 addition to the roofing scope for panel removal, storage, and reinstallation. Panel reinstallation requires recertification of the electrical connections in most LA jurisdictions. Coordinate with your original solar installer if the system is still under warranty — unauthorized removal can void the panel or inverter warranty.
Low-pitched or flat roofs with single-ply membrane (TPO, PVC) are the easiest for solar integration — panels mount on ballasted racking systems without penetrations. Asphalt composition shingle is the easiest steep-slope material for solar mounting. Tile roofs (clay or concrete) require tile-hooked mounts that integrate with the tile without penetrating the waterproofing plane, which are more expensive but reliable. Metal roofing with standing seam is ideal — panels clamp to the seams with zero penetrations.
Yes, in most cases. Standard roofing manufacturer warranties void coverage in areas where panels are installed unless the installation uses manufacturer-approved mounting systems and is performed by a certified installer. Always get written confirmation from your roofer that the solar mounting method does not void the roofing warranty, and ensure the solar installer provides a separate waterproofing warranty on all mounting penetrations.