Is One AED in a Building Not Enough?

A Practical Guide Based on the 3-Minute Rule

When planning an effective workplace safety program, one of the most common questions is: “How many AEDs do we actually need in our building?”

The answer isn’t based on square footage alone—it’s based on response time. Specifically, the 3-minute rule, which is the gold standard in cardiac emergency planning.

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⏱️ The 3-Minute Rule: Why It Matters

When someone experiences sudden cardiac arrest (SCA):

• Survival decreases by 7–10% for every minute without defibrillation
• Brain damage can begin within 4–6 minutes
• Emergency services often take 6–10+ minutes to arrive

👉 This means your AED program must ensure that a defibrillator / automated external defibrillator can reach the victim within 3 minutes or less.

This includes:

• Time to recognize the emergency
• Time to retrieve the AED
• Time to return and apply it

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🧠 What This Means for AED Placement

To meet the 3-minute rule, AEDs must be:

✅ Strategically placed (not just “one per building”)

✅ Easily accessible (not locked away)

✅ Clearly visible and well-marked

✅ Located based on travel time—not distance alone

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📏 General Rule of Thumb

In most buildings:

👉 You need enough AEDs so that any location can be reached and returned from within 3 minutes

Typical guideline:

• 1 AED per 1–2 minutes of walking distance
• Usually 1 AED per floor (minimum)
• Larger or complex layouts require multiple units per floor

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🏢 Building-Specific Examples

Office Building (2 floors, ~20,000 sq ft)

• Minimum: 1 AED per floor
• Better: 2 per floor if layout is spread out

Warehouse / Industrial Facility

• Multiple AEDs required due to:
  • Large distances
  • Obstructions
  • Noise / communication delays

👉 Often 1 AED per 100–150 meters of travel distance

Schools / Gyms / Public Spaces

• Place AEDs near:
  • Entrances
  • Gymnasiums
  • High-traffic areas

👉 These environments often require more units due to risk level

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🔥 AEDs vs Fire Extinguishers (Important Comparison)

Many organizations are familiar with fire extinguisher requirements—this is actually a great comparison.

Fire Extinguishers:

• Typically required every 75 feet (23 meters)
• Designed for immediate access anywhere in a building

AEDs:

• Should follow a similar philosophy:
  • Rapid access
  • Strategic distribution
  • No delays

👉 The key difference:

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⚠️ Common Mistakes to Avoid

❌ Only installing one AED Defib per building

→ This often fails the 3-minute rule

❌ Placing AEDs in locked offices or hidden locations

→ Delays access when seconds matter

❌ Ignoring building layout

→ Elevators, long hallways, and restricted areas increase response time

❌ Treating AEDs as compliance-only

→ They are a life-saving system, not just a requirement

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🧩 Key Factors That Affect How Many AEDs Machines You Need

Every building is different. Consider:

• Size and layout
• Number of floors
• Population and occupancy
• Risk level (age, activity, environment)
• Distance between key areas
• Availability of trained responders

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📈 Why More AEDs Often Make Sense

Adding additional AEDs:

• Improves response time
• Increases survival rates
• Reduces liability risk
• Strengthens workplace safety programs

👉 In most cases, the cost of one additional AED is small compared to the impact it can have.

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🧠 Final Answer: How Many AEDs Do You Need?

👉 You need enough AEDs so that any person in your building can be reached and defibrillated within 3 minutes or less.

That usually means:

• More than one AED per building
• At least one per floor
• Additional units for larger or complex spaces

👉 If you're evaluating options, explore our full range of AEDs for sale in Canada

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❤️ About AED.ca

AED.ca is a leading Canadian provider of automated external defibrillators, helping organizations across the country implement effective, compliant, and life-saving AED programs.

We specialize in:

• AED sales and placement strategy
• Workplace and public access defibrillation programs
• Ongoing maintenance and compliance support

Our goal is simple: make AED ownership easy, affordable, and effective—so more lives can be saved.

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👤 About Martin Andrews

Martin Andrews is the founder of AED.ca and a recognized specialist in AED deployment and workplace cardiac safety. He has helped thousands of organizations across Canada determine the right AED solutions for their environments, with a focus on practical implementation and real-world outcomes.

Martin is passionate about increasing access to AEDs and ensuring that businesses are properly equipped to respond when sudden cardiac arrest occurs.

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If you’re unsure how many AEDs your facility needs, AED.ca can provide a customized recommendation based on your building layout and risk profile.