Long Island roofs work hard. Nor'easters, summer storms, ice damming in winter, salt-air exposure from the South Shore, and 80–95°F summer days all chip away at shingles, flashing, and sealants. When something fails, the first question every homeowner asks is: what's this going to cost? Here are real 2026 Long Island repair prices — not internet averages.
Small Repairs: $400 to $900 - This bucket covers the most common Long Island roof calls. Replacing a small section of shingles after wind damage runs $400–$700. Re-sealing a vent boot or pipe collar that's leaking is typically $400–$550. Re-flashing or re-sealing around a chimney sidewall runs $550–$900. Re-securing a section of loose ridge cap is $400–$650. These are usually one-truck, one-day repairs.
Mid-Size Repairs: $900 to $2,200 - When the issue is bigger but not catastrophic, you're in this range. A full skylight reseat and re-flash is typically $1,200–$2,000. Replacing a valley with new metal flashing and ice-and-water shield runs $1,400–$2,200. A 100–200 sq ft shingle replacement section (often after a tree limb fall) is $1,200–$2,000. Chimney crown rebuild plus counter-flashing runs $1,500–$2,400.
Larger Repairs: $2,500 to $6,000 - At this level you're looking at multiple slopes, structural elements, or significant water damage. A full chimney rebuild from the roofline up runs $3,500–$6,000. Replacing a 30-foot run of gutter plus fascia repair from ice-dam damage is typically $2,500–$4,500. Repairing a flat roof seam separation across a large commercial section can run $2,800–$5,000. At this point we're often discussing whether full replacement makes more financial sense.
When to Repair vs. Replace - The rule of thumb on Long Island: if your roof is under 15 years old and the damage is localized, repair. If your roof is over 20 years old (architectural shingle) or 15 years (3-tab), and you're seeing multiple problem areas, replace. Repeated repairs on an aging roof rarely pay off — you spend $3K–$5K patching a roof that needs to come off in two years anyway.
Storm Damage and Insurance - Wind, hail, fallen tree limbs, and ice-dam damage are usually covered by Long Island homeowner's insurance. We provide the documentation adjusters need — detailed photos, written damage reports, scope of repair with line-item pricing — and work directly with your insurance company. Your out-of-pocket is typically just your deductible.
Flat Roof Repairs (TPO, EPDM, Modified Bitumen) - Most Long Island multi-family, commercial, and converted-garage roofs are flat. Flat-roof repair prices: small seam re-seal $500–$900. Membrane patch on a 5×5 ft section $700–$1,200. Drain re-flashing $800–$1,400. Larger membrane repairs or partial re-roofs run $4–$8 per square foot.
Hidden Costs to Watch - Two things blow up roof repair budgets. First, decking damage — if water has been entering for months, the plywood underneath has rotted, and replacing decking adds $80–$150 per sheet (plus labor). Second, code upgrades — if your roof needs to be brought up to current code (ice-and-water shield in valleys and at eaves, drip edge, ridge ventilation), that's an additional $1,500–$3,500 on larger repairs. We tell you about both before any paid work starts.
Emergency / Same-Day Service - For active leaks, we tarp or emergency-patch within 24 hours (often same-day) to stop water entry. Emergency tarping is typically $400–$700 and is credited toward the permanent repair if you proceed with us.
Warranty - Every Doon repair includes a written 10-year workmanship warranty. Full-roof replacements add the manufacturer's material warranty (25–50 years for shingle products, 15–20 years NDL for flat-roof systems).
If you have a leak or storm damage anywhere on Long Island, Doon Construction Corporation dispatches roof-repair crews within 24 hours. Call (718) 216-2725 for same-day response and a written estimate.