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- Published:15 June 2026
When someone experiences a sudden cardiac arrest, every second counts. Having an automated external defibrillator (AED) nearby can make a significant difference to survival outcomes, but owning an AED is not enough.
It needs to be located where it can be reached quickly and used without unnecessary delays. This is where the AED 3-minute rule becomes an important consideration for organisations, workplaces, and community spaces.
As a practical guide, an AED should be close enough to retrieve and be used within around three minutes. This often means placing it within roughly 100 meters, or a 1-2 minute brisk walk, depending on the layout of the site.
In this blog, we will be covering what the AED 3-minute rule is, the recommended distance for defibrillator retrieval, and where you should place your defibrillator.
What Is The AED 3 Minute Rule?
The AED 3-minute rule is a practical way to think about defibrillator placement. The device should be close enough for a responder to retrieve it and return to the casualty within a three-minute window.
For workplaces, schools, sports facilities, and community spaces, this means the AED should not simply be placed wherever is convenient; it should be positioned where people can reach it quickly during a real emergency.
International guidance suggests that AEDs should be reachable within a one or two-minute brisk walk, which translates to approximately 100 metres in a straight line. Every building and outdoor space is different, but this should give organisations a benchmark when deciding on defibrillator placement.
What Is The Recommended Retrieval Distance for a Defibrillator?
The ideal retrieval distance will depend on the layout, access points and size of each location. Generally, the best distance is one that someone can realistically cover while still getting the AED back to the casualty quickly.
Organisations should also consider real-world access barriers, such as stairs, locked doors, corridors, lifts, and out-of-hours availability. In practice, the question becomes “how long will it take someone to get it during a stressful emergency?”
Distance matters because an AED is most effective when it is used quickly. Research shows that the further an AED is from the location of an out-of-hospital cardiac arrest, the greater the risk to the casualty. One study found that mortality increased by 10% for every additional 100 metres between the AED and the cardiac arrest location.
In Britain, the average public access defibrillator was 726 metres away from the centre of a postcode, and in the most deprived areas of England and Scotland, the nearest 24/7 defibrillator was, on average, more than a mile round trip away.
For large sites, one defibrillator may not be enough. Schools, business parks, and sports facilities may need multiple AEDs to keep retrieval times within a safe range. The priority should be to reduce delays, make the device obvious, and ensure it can be reached quickly.
Where Should You Place an AED?
There is no single location that suits every defibrillator installation; the best AED placement depends on the size of the site, how people move around it, and when it is occupied.
In offices and workplaces, AEDs are typically best placed in a central, visible location, such as a reception area. The device should be accessible without keys, access cards or other security barriers, and large sites may require multiple AEDs to keep access times within the recommended range.
Educational facilities such as schools and colleges should position AEDs where they can be accessed quickly, like at a reception desk. Smaller sites may only need one centrally located device, while larger locations may benefit from additional AEDs near high-traffic areas.
Sports clubs, leisure centres, and other community venues should place AEDs close to activity areas while ensuring they remain easy to find for responders. Where facilities are used outside normal hours, an externally mounted AED cabinet can provide valuable 24/7 access, helping to ensure the device remains available during evenings, overnight periods and weekends when many out-of-hospital cardiac arrests occur, and indoor devices may be inaccessible.
Whatever the environment, AEDs should be visible, clearly signposted and easy to access. Organisations should avoid barriers where possible and register their AEDs on The Circuit so emergency services can direct callers to the nearest available device.
Keep Your AED Close Enough to Save Time
How far should you be from a defibrillator? Ideally, close enough to be retrieved and used within around three minutes, with a practical placement target of around 100 metres or one or two minutes of brisk walking where possible.
For organisations and community spaces, the priority is to reduce delays, remove access barriers, and make the AED easy to find.
If your site does not currently have a defibrillator, or your existing device is too far away, difficult to access or unavailable out of hours, now is the right time to review your AED provision.
Defib World supplies defibrillators, rental AEDs, cabinets and accessories to help workplaces and public-facing sites improve emergency readiness with flexible, reliable solutions.
Order online today to make sure your organisation has fast access to a life-saving defibrillator when it matters most. If purchase isn’t the right option for your budget or requirements, Defib World also offers AED rental solutions.
