FAQ
How much does slate cost vs asphalt in the Hamptons?
Roughly four to five times as much up front, and often less per year. Natural slate runs about $2,000–3,500 per square installed (national 2026) against $530–795 for architectural asphalt on Long Island. On a 30-square roof that is $60,000–105,000 for slate versus $15,900–23,850 for asphalt. Slate lasts 75–200 years (hard slate commonly 125–200); asphalt 20–30. Divide and slate is frequently the cheaper roof per year of service, if the framing can carry it and you will own the house long enough to care. Synthetic slate splits the difference at $1,155–1,890 per square and 40–50+ years.
Last updated · Reviewed by Sag Harbor Roofing Co.
Up-front cost
| Per square | 30-square roof | Typical life | |
|---|---|---|---|
| Architectural asphalt (LI 2026) | $530–795 | $15,900–23,850 | 20–30 yrs |
| Designer asphalt (national) | $800–1,200 | $24,000–36,000 | 25–40 yrs |
| Synthetic slate (LI 2026) | $1,155–1,890 | $34,650–56,700 | 40–50+ yrs |
| Natural slate (national) | $2,000–3,500 | $60,000–105,000 | 75–200 yrs |
Cost per year
Take the middle of each range and divide by a conservative life: asphalt at about $20,000 over 25 years is roughly $800 a year; natural slate at about $82,000 over 100 years is roughly $820 a year, and the slate is still on the house. Over 150 years the slate wins clearly. Over 15 years, asphalt wins clearly. The decision is a time-horizon decision.
What else slate costs
- Structure. Slate is heavy; framing may need reinforcement, priced separately.
- Labor. 6–10 days of skilled install against 1–3 for asphalt, and a roofer who actually works in slate.
- Copper. Fasteners and flashing must be copper or stainless, especially by the water.
- No overlay, ever. New York code forbids recovering over slate; when it is finally done, it all comes off.
When asphalt wins
Plenty of the time. If you expect to sell within 10–15 years, the framing was never designed for stone, the house is a Cape or a ranch where slate would look borrowed, or the budget simply has better uses, architectural or designer asphalt is the rational choice. It installs in 1–3 days, needs no structural work, and a designer line gives you a slate-like profile and a wind rating to 130 mph for $800–1,200 per square. The mistake is not choosing asphalt; it is choosing the cheapest asphalt on an oceanfront roof and skipping the ice-and-water shield and stainless fasteners that the site needs.
The Hamptons angle
Southampton's estate section and Sag Harbor's old village have a lot of slate that is a century old and mostly sound. Restoring that slate (re-hanging slipped pieces, replacing broken ones from matched stock, renewing the copper) is nearly always the better decision than replacing it, and in the Sag Harbor historic district a visible material change needs a Certificate of Appropriateness anyway.
Services
Related services
Slate Roofing
Natural slate for estates that will keep it a century, restoration for the old slate roofs in Southampton and Sag Harbor, and synthetic slate for owners who want the look at a third of the price.
Full Roof Replacement
Tear-off to the deck and a new roof system in asphalt, cedar, slate, metal or membrane, priced against published 2026 Long Island ranges so you know what a fair quote looks like.
Ready to talk to a real local pro?
Sixty seconds. One licensed, insured roofer who works your town calls you within one business day. Free for homeowners; nobody else gets your number.