Slate costs 5–7x more upfront than asphalt. It also lasts 100+ years. This calculator runs the lifetime math so you can see when slate pulls ahead, how many re-roofs you avoid, and the resale premium when you sell.
We don't sell slate roofs and we don't profit from the install. The math is what it is. Slate makes sense on some homes and not on others. Here's the honest comparison, in 2026 dollars, region-adjusted, including cost inflation on the alternative material's re-roofs.
We estimate roof area from home square footage (roof is typically 1.3x the footprint for a standard pitched roof). Override below if you know your actual roof area.
If you don't go slate, what would you install? Asphalt is the default for most homes. The math compares slate (one install) against the alternative (multiple re-roofs over your horizon).
Updates live as you change inputs above. Costs are in 2026 dollars and include 3.5% annual escalation on future re-roofs (long-term construction inflation average per NAHB data).
A real slate quote depends on your roof pitch, deck condition, access for staging, and which quarry the slate comes from. Art Slate Roofing has been installing and restoring slate roofs in the Northeast for two decades. The consultation is free and you'll get an honest read on whether slate is the right call for your home — including when it isn't.
We'll never share your info. You'll hear from Art Slate (or a Benefitra marketing-client roofer in your area) within 1 business day.
How this estimate works. Installation costs are 2026 national midpoints. Region multipliers adjust service life for climate severity. Future re-roofs of the alternative material are escalated at 3.5% annually (long-term construction-cost inflation per NAHB). Slate lifespan assumes a properly framed deck (slate weighs 800–1500 lbs per square; some homes need structural reinforcement at the time of install — that cost is not included here). Resale premium is based on NAR Cost vs. Value Report benchmarks, which vary by market. This tool is for informational purposes; a real quote requires a site visit because pitch, access, and substrate condition drive 20–40% of the price.