# Retaining Wall Collapsed? What to Do First | NYC Retaining Walls > Retaining wall collapsed? What to do first: keep people clear, call 911 or 311, document it, call your insurer, then stabilize and rebuild. Free site visit. URL: https://nycretainingwalls.com/guide/retaining-wall-collapse-what-to-do/ 1. [Home](https://nycretainingwalls.com/) 2. [Retaining Wall Violation Repair](https://nycretainingwalls.com/retaining-wall-violation-repair/) 3. Retaining Wall Collapsed: What to Do in the First 24 Hours Learn # Retaining Wall Collapsed: What to Do in the First 24 Hours A collapsed retaining wall is a safety problem first and a construction problem second. The steps below are in the order they matter. By NYC Retaining Walls · Updated October 18, 2026 ![Collapsed section of a backyard retaining wall with spilled soil and caution tape strung around it in New York City](https://nycretainingwalls.com/images/collapsed-retaining-wall-with-soil-spill-and-caution-tape-backyard-nyc-1440.webp) Short answer If a retaining wall has collapsed, keep everyone away from the debris and the remaining wall, call 911 if anyone is hurt or a building, gas line or street is threatened, and call 311 to report it to DOB. Then photograph everything, notify your insurer, and have an engineer assess what's left before anyone digs. Key facts - Unsafe retaining walls are reported to DOB through 311 (212-NEW-YORK) (DOB; Admin Code §28-305.4.6). - After the Jan 10, 2024 Tremont wall collapse in the Bronx, DOB issued full vacate orders to three buildings (Bronx Times). - After a 9-ft wall collapse in Sunset Park in Dec 2020, DOB issued a partial vacate on both backyards; no permits had been issued for the work (NY1). - Rebuilding a failed section in NYC: about $90–$160 per linear ft (Fixr $70–$125 × RSMeans 129.1). [NYC Retaining Walls](https://nycretainingwalls.com/) is a licensed and insured retaining wall contractor that stabilizes and rebuilds failed walls across the five boroughs. Retaining wall collapsed? What to do comes in a fixed order: people first, then reporting, then records, then the wall. A collapse rarely ends with the first slide — the soil behind it and the sections still standing have just lost support. The steps below follow that order. Our [retaining wall violation repair](https://nycretainingwalls.com/retaining-wall-violation-repair/) page covers the work that follows a DOB order. ## Who do you call first? **Call 911 now if:** - Anyone is hurt or trapped. - Debris or soil has hit a house, a garage with people in it, a car on the street, or a sidewalk in use. - A gas line, electrical service or water main may be damaged — and stay away from it. **Call 311 (212-NEW-YORK) today if:** - The collapse threatens a building, a sidewalk, a street or a neighbor’s property. - The remaining wall is cracking, leaning or shedding soil. - The wall is shared, or you’re not sure whose it is. DOB takes retaining wall reports through 311 and can inspect, order the area protected, and issue violations or vacate orders. **This can wait a day or two:** choosing a contractor, getting rebuild prices and deciding on materials. ## What should you do in the first 24 hours? 1. **Keep everyone back** — from the debris, the face of what’s still standing and the ground at the top, where new cracks may open. Tape it off; keep children and pets away. 2. **Don’t dig out the debris.** It may be holding back soil. Removing it from the toe can bring down more. 3. **Divert water.** Turn off irrigation, redirect downspouts and, if it’s safe, cover exposed soil with tarps so rain doesn’t saturate it further. 4. **Document everything** with dated photos and video: the wall, the soil, damage to the house or the neighbor’s property, and anything that may have caused it. 5. **Notify your insurer.** Most collapses from soil or water pressure aren’t covered, but a sudden event may be, and late notice can hurt a claim. See the [insurance guide](https://nycretainingwalls.com/guide/does-homeowners-insurance-cover-retaining-wall-collapse/). Not sure what your wall needs? A free site visit gets you measurements, a crack map and a written price. Or call [(718) 555-0100](tel:+17185550100). [Book a free site visit](https://nycretainingwalls.com/contact/) ## What does DOB do after a collapse? DOB inspects and acts on what it finds. After a 150-foot section of wall collapsed in Tremont in the Bronx on **January 10, 2024**, the Bronx Times reported full vacate orders on three Anthony Avenue buildings, and DOB said the owners had never filed repair applications despite a partial vacate order in place since 2020. After a **9-foot** retaining wall collapsed in Sunset Park in December 2020 and killed a worker, NY1 reported DOB found no permits for the work and issued a partial vacate on both backyards. If your wall is 10 feet or taller and fronts a public right-of-way, it’s also in the Local Law 37 program, and an Unsafe condition must be corrected within **90 days**; see the [Local Law 37 guide](https://nycretainingwalls.com/guide/local-law-37-retaining-wall-requirements/). ## Who is responsible for the rebuild? The survey decides. A wall wholly on one lot belongs to that owner; a wall on the common lot line is a joint responsibility, half each (Admin Code §28-305.1.1). If a neighbor’s project caused the collapse, that changes the conversation — keep your records and consider talking to an attorney. See the [neighbors guide](https://nycretainingwalls.com/guide/who-is-responsible-for-retaining-wall-between-neighbors-nyc/) and [shared retaining wall repair](https://nycretainingwalls.com/shared-retaining-walls/). ## How is the wall stabilized and rebuilt? First, an engineer or experienced contractor stabilizes what’s left — temporary shoring, regrading the slope back, or removing loose sections in a controlled order. Then the rebuild is designed. Any wall 4 feet or taller from the top of the footing, or one that supports a driveway, building or slope, needs a DOB permit and stamped plans (1 RCNY §101-14). In NYC, rebuilding typically runs about **$90–$160 per linear foot**, and a new wall about **$20–$65 per square foot** of face depending on material (Fixr and HomeGuide national figures × RSMeans NYC index 129.1). The [replacement cost guide](https://nycretainingwalls.com/guide/retaining-wall-replacement-cost-nyc/) has worked examples, and [retaining wall replacement](https://nycretainingwalls.com/retaining-wall-replacement/) explains the work. The rebuild should include what the old wall likely lacked: ¾-inch clean stone, filter fabric and a perforated drain — see [retaining wall drainage repair](https://nycretainingwalls.com/retaining-wall-drainage/). For a starting number before the site visit, use the [cost estimator](https://nycretainingwalls.com/tools/retaining-wall-cost-estimator/); the [Bronx](https://nycretainingwalls.com/service-areas/bronx/) page covers the borough of the 2024 Tremont collapse. Bottom line After a collapse, get people clear, report it, document it and let an engineer decide what's safe before anything is moved; the rebuild comes after that. For an assessment and a written rebuild price, [(718) 555-0100](tel:+17185550100). ## Frequently asked _questions._ **### Should I clear the debris myself?** Not right away. Debris from a collapsed retaining wall is often holding back soil that would otherwise slide, and the wall sections still standing may have lost support. Removing material from the toe can trigger a second failure. Keep people clear, photograph everything, and let an engineer or experienced contractor say what can be moved, in what order and with what shoring. **### Who pays to rebuild a collapsed retaining wall?** The owner of the lot it sits on — or both owners, half each, if it was on the common lot line (Admin Code §28-305.1.1). Insurance usually doesn't pay when the cause was soil movement, water pressure or age, but it may when a sudden event like a vehicle or falling tree caused the collapse. A survey settles ownership if there's any doubt. **### Will DOB issue a violation after a collapse?** It can. DOB inspects after reported collapses and may issue violations, stop-work orders or vacate orders for affected buildings or yards, as it did after collapses in Tremont in 2024 and Sunset Park in 2020. Rebuilding usually needs a DOB permit with stamped plans when the wall is 4 feet or taller or carries a surcharge. Sources 1. [NYC DOB — Retaining walls: information for property owners](https://www.nyc.gov/site/buildings/property-or-business-owner/retaining-walls.page) 2. [NYC DOB — Retaining wall FAQs (unsafe conditions)](https://www.nyc.gov/site/buildings/safety/retaining-wall-faqs.page) 3. [Bronx Times — Vacate orders after Tremont retaining wall collapse (Jan 2024)](https://www.bxtimes.com/vacate-order-retaining-wall-collapse-tremont/) 4. [NY1 — One dead after wall collapses in Sunset Park (Dec 28, 2020)](https://ny1.com/nyc/all-boroughs/news/2020/12/28/one-person-dead-after-wall-collapses-in-sunset-park-building) 5. [Fixr — Retaining wall repair cost (updated Jan 31, 2025)](https://www.fixr.com/costs/retaining-wall-repair) Questions about your wall? Callback within 1 business hour. Mon–Sat, 7am–7pm. [Call (718) 555-0100](tel:+17185550100) [Book a free site visit](https://nycretainingwalls.com/contact/) Related service [Retaining Wall Violation Repair](https://nycretainingwalls.com/retaining-wall-violation-repair/) SREM and Unsafe ratings, DOB violations and complaints — repairs scheduled against your deadline. Get a number first [Cost estimator — length × height × material](https://nycretainingwalls.com/tools/retaining-wall-cost-estimator/) ## Related _guides._ - [Learn Does Homeowners Insurance Cover Retaining Wall Collapse?](https://nycretainingwalls.com/guide/does-homeowners-insurance-cover-retaining-wall-collapse/) - [Learn Is a Leaning Retaining Wall Dangerous?](https://nycretainingwalls.com/guide/is-a-leaning-retaining-wall-dangerous/) - [Cost Guide How Much Does Retaining Wall Replacement Cost in NYC?](https://nycretainingwalls.com/guide/retaining-wall-replacement-cost-nyc/) - [Code Guide Who Is Responsible for a Retaining Wall Between Neighbors in NYC?](https://nycretainingwalls.com/guide/who-is-responsible-for-retaining-wall-between-neighbors-nyc/) - [Code Guide Do I Need a Permit for a Retaining Wall in NYC?](https://nycretainingwalls.com/guide/retaining-wall-permit-nyc/) ## Get a written price on your wall Two quick steps. Free site visit. Callback within 1 business hour · [(718) 555-0100](tel:+17185550100) Thanks, we have your request. Callback within 1 business hour. If it's urgent, call [(718) 555-0100](tel:+17185550100). A number for _your_ wall, not an average. Free site visit and a written, line-item price. [Book a free site visit](https://nycretainingwalls.com/contact/) [Call (718) 555-0100](tel:+17185550100) Callback within 1 business hour · Mon–Sat, 7am–7pm