Solar Panel Cost by Roof Type: Asphalt, Metal, Tile & Flat Roofs
By Solar Cost Predictor Team · April 28, 2026 · 6 min read
Solar installers quote a base price per watt, then adjust for your specific roof — the mounting hardware and labor needed to safely and watertightly attach panels varies a lot by roof material.
Asphalt Shingle: The No-Surcharge Baseline
Asphalt shingle is the most common US roof type and the easiest to mount on — standard flashed mounts seal around the hardware without extra cost. Most installer pricing (including typical $2.75–$3.25/watt quotes) assumes an asphalt roof by default.
Metal and Tile Roofs: $500–$2,000 Extra
Standing-seam metal roofs are actually one of the easiest upgrades — clamps attach to the seams without any roof penetration, sometimes with minimal extra cost. Corrugated metal and tile roofs (clay, concrete, slate) need specialized flashing or tile-replacement mounts, typically adding $500–$2,000 depending on tile fragility and roof pitch.
Flat Roofs: Ballasted Systems
Flat and low-slope roofs (common on some ranch homes and additions) typically use ballasted mounting — angled racks held down by weight rather than penetrating the roof — which adds $800–$1,500 and requires a structural check to confirm the roof can bear the added weight.
Frequently Asked Questions
Which roof type is cheapest for solar?
Asphalt shingle roofs are the baseline with no surcharge in most installer pricing, since standard flashed mounts work without extra hardware.
Do metal roofs always cost more for solar?
Not always — standing-seam metal roofs can actually be cheaper to mount on than shingle, since clamps attach without roof penetration. Corrugated metal usually does add cost.
Can you put solar on a flat roof?
Yes, using a ballasted racking system angled toward the sun — it requires a structural assessment to confirm the roof can support the added weight, and typically adds $800–$1,500 to the cost.