Updated 24 March 2026
Can Your Roof Handle Solar Panels?
Before getting quotes, check these five factors. A bad roof match wastes time and money.
1. Roof Age
| Roof Age | Recommendation |
|---|---|
| Under 10 years old | Install solar now |
| 10-15 years old (asphalt) | Get a roof inspection first |
| 15-20 years old (asphalt) | Replace roof first, then solar |
| Metal or tile (under 30 yrs) | Install solar now |
Removing and reinstalling solar panels for a reroof costs $2,000-$5,000. Avoid this by ensuring your roof outlasts the 25-year panel warranty.
2. Roof Material
| Material | Solar Compatible? | Extra Install Cost |
|---|---|---|
| Asphalt shingle | Excellent | $0 (standard) |
| Standing seam metal | Excellent (clamp mount) | $0 (no drilling) |
| Corrugated metal | Good | $500-$1,000 |
| Concrete tile | Good (fragile tiles) | $1,000-$2,000 |
| Clay tile | Good (requires hooks) | $1,000-$3,000 |
| Flat roof (TPO/EPDM) | Good (ballast mount) | $500-$1,500 |
| Slate | Difficult (fragile) | $2,000-$4,000 |
| Wood shake | Difficult (fire risk) | $1,000-$3,000 |
3. Roof Orientation and Pitch
| Direction | Production vs South | Recommended? |
|---|---|---|
| South | 100% | Ideal |
| Southwest / Southeast | 90-95% | Great |
| West | 80-85% | Good (peaks match evening usage) |
| East | 80-85% | Good (morning production) |
| North | 60-70% | Not recommended |
| Flat | 85-90% | Good (use tilt mounts) |
Ideal pitch: 15-40 degrees. Most residential roofs are 20-35 degrees which is perfect. Flat roofs use tilt racks (adds $500-$1,500) to aim panels at the optimal angle.
4. Shade
Even partial shade kills solar output. A single shaded panel can reduce the output of the entire string by 50% or more with traditional string inverters.
Solutions for shade:
- • Microinverters (Enphase) - each panel operates independently, so shade on one does not affect others. Adds $500-$1,500 to system cost.
- • Power optimisers (SolarEdge) - similar benefit, slightly cheaper than microinverters.
- • Tree trimming - $200-$2,000 depending on the tree. Often the cheapest fix.
Your installer should do a shade analysis using satellite imagery or an on-site tool like a Solar Pathfinder. If more than 30% of your roof is shaded during peak hours (10am-3pm), solar may not be viable.
5. Structural Integrity
Solar panels add 2-4 lbs per square foot to your roof load. Most roofs built to modern code can handle this easily. Potential issues:
- • Older homes (pre-1970): May need a structural engineer assessment ($200-$500)
- • Roof damage: Sagging, water damage, or rot must be repaired first
- • Snow load areas: If your area gets heavy snow, ensure the roof can handle panels + snow weight combined
Quick check: If your roof is under 10 years old, faces south/west/east, has minimal shade, and is asphalt shingle or metal, you are an ideal solar candidate. Get three quotes and compare.
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