How Many AEDs Are Required in a Building by Law?

No federal law sets a specific number of AEDs required in a building. How many automated external defibrillators you must have depends on your state, your municipality, the type of building, and in some cases industry-specific rules. Where AEDs are required or recommended, the working standard is coverage, not a fixed count: place enough units that a rescuer can retrieve one and begin defibrillation within three to five minutes of a cardiac arrest, a window in which survival odds drop roughly 7 to 10 percent with each passing minute.1Circulation. Part 4: The Automated External Defibrillator: Key Link in the Chain of Survival

Why No Single Number Applies Nationwide

The United States has no blanket federal requirement for AEDs in private or commercial buildings. OSHA’s workplace safety standards do not specifically address AEDs, though the agency encourages their installation and has published guidance on setting up workplace AED programs.2Occupational Safety and Health Administration. Automated External Defibrillators (AEDs) – Overview

The closest thing to a federal mandate is the Cardiac Arrest Survival Act of 2000, which directed the Department of Health and Human Services to develop guidelines for placing AEDs in federal buildings. Even that law doesn’t actually require AEDs anywhere. The guidelines state explicitly that public access defibrillation programs in federal facilities are voluntary, with costs borne by the sponsoring agency.3Federal Register. Guidelines for Public Access Defibrillation Programs in Federal Facilities The statute itself goes further, clarifying that it “does not establish any cause of action, or require that an automated external defibrillator device be placed at any building or other location.”4Office of the Law Revision Counsel. 42 US Code 238q – Liability Regarding Emergency Use of Automated External Defibrillators

Actual AED requirements come from a patchwork of state laws, local ordinances, and industry regulations. The types of buildings covered, the number of devices required, and the maintenance standards all vary by jurisdiction. Your first step is checking the specific rules in your state and municipality.

How to Calculate the Number of AEDs You Need

Even when the law is silent on a specific count, the math behind AED placement is straightforward: every spot in your building should be within a round-trip walk of an AED that takes no more than three to five minutes.5American Heart Association. Your On-site AED Program: An Implementation Guide One AHA-affiliated study translated this into roughly a 100-meter (about 330-foot) coverage radius per device, based on the approximate maximum distance someone can walk in 1.5 minutes.6Circulation. Identifying Locations for Public Access Defibrillators

Applied to multi-story buildings, that rule of thumb produces these benchmarks:

  • Small buildings of one to three floors: one or two AEDs total, depending on floor size.
  • Mid-rise buildings of four to eight floors: at least one AED per floor, with extra units near higher-risk areas like fitness centers or cafeterias.
  • High-rise buildings of nine or more floors: one AED per floor at minimum, with additional units on floors that have large square footage or high occupancy.

Floors larger than roughly 10,000 square feet often need more than one unit to stay inside the three-to-five-minute window. So do buildings with long corridors, multiple wings, or access barriers like locked doors and security checkpoints that slow a responder down. Stairs matter too. Counting on someone to sprint up several flights and back is not a viable plan, so tall buildings almost always need per-floor coverage rather than a shared unit somewhere in the middle.

Certain spaces justify a dedicated AED regardless of floor-level coverage: gyms, swimming pools, large assembly halls, and anywhere elderly populations or people doing strenuous physical activity concentrate. These locations see a disproportionate share of cardiac events, and the seconds saved by having a device in the same room can be decisive.

Placement Affects the Count

An AED tucked inside a locked office or hidden behind a stairwell door does not count toward coverage in any practical sense. Devices should be mounted in high-traffic, visible locations: near elevators, at main corridor intersections, in lobbies, and next to gathering spaces like break rooms and reception areas. Signage at each unit and at building entrances lets someone who has never set foot inside locate the nearest AED within seconds. If a device isn’t reachable in the time window, you either need to move it or add another one.

Buildings Most Often Required to Have AEDs

Specific statutes vary across jurisdictions, but certain building types show up repeatedly in state and local AED mandates:

  • Schools and athletic facilities. Many states require AEDs at high schools and wherever interscholastic athletics take place. Some also mandate CPR education before graduation.
  • Health clubs and gyms. The combination of physical exertion and cardiac risk makes fitness facilities among the most commonly regulated building types.
  • Large public venues. Stadiums, arenas, and convention centers frequently fall under AED mandates, particularly in densely populated areas.
  • Government buildings. Many jurisdictions extend AED requirements to government-owned or government-operated facilities.
  • Nursing homes and assisted living facilities. Elevated cardiac arrest risk among elderly residents has driven a growing number of states to mandate AEDs in these settings.
  • Dental and medical offices. Some states require AEDs in practices that administer anesthesia or sedation, where drug-induced cardiac complications are a recognized risk.

Aircraft sit outside the building question but often come up alongside it. Federal aviation regulations require at least one AED aboard any commercial passenger aircraft that carries a flight attendant and has a maximum payload capacity over 7,500 pounds, which in practice covers most planes seating 30 or more passengers.7eCFR. 14 CFR 121.803 – Emergency Medical Equipment

What Happens If You Don’t Meet the Requirement

Where a state or local law mandates AEDs, failing to comply can trigger civil penalties. Specific fines vary by jurisdiction but can start in the hundreds of dollars for a first violation and climb with repeated offenses. Beyond regulatory fines, a building owner who fails to provide a legally required AED could face negligence claims if someone suffers a cardiac arrest on the premises with no device available.

The survival data reinforces the point. Research from a large multi-site study found that bystander AED use before paramedics arrive nearly triples the odds of surviving cardiac arrest compared to bystander CPR alone: 24 percent survival with AED application versus 9 percent with CPR only, and 38 percent when the AED delivered a shock.8National Library of Medicine. Survival After Application of Automatic External Defibrillators Before Arrival of the Emergency Medical System OSHA notes that AED use within three to four minutes of cardiac arrest can produce a 60 percent survival rate.9Occupational Safety and Health Administration. Best Practices Guide: Fundamentals of a Workplace First-Aid Program Each minute without defibrillation cuts survival chances by 7 to 10 percent.1Circulation. Part 4: The Automated External Defibrillator: Key Link in the Chain of Survival

Making the Number You Choose Actually Work

Buying the right quantity is only useful if each unit is ready when the moment comes. Batteries typically last four to five years, and electrode pads carry a separate “use by” date printed on the packaging. Both need replacing before they expire. Most modern AEDs run automatic self-tests and display a readiness indicator, but a monthly visual check is standard practice: confirm the status light shows ready, verify that pads and batteries haven’t expired, and make sure nothing is blocking access to the cabinet.

Many states also require AED owners to register each device with the local 911 dispatch center or EMS agency. Even where registration isn’t mandatory, it’s worth doing. Dispatchers who know your building has an AED can direct callers to the nearest one, which can shave critical minutes off the response and, in effect, extend the coverage each unit provides.