009 - IBC Occupancy Classifications: All 10 Groups Explained

Occupancy classifications are the foundation of everything in the building code. This episode walks you through all 10 IBC occupancy groups and explains how each one affects building design, fire protection, egress, and life safety.

We break down what makes each occupancy group unique with real-world examples. You'll learn the 50-person rule that separates Assembly from Business, why colleges are Group B and not Group E, how mixed-use buildings handle multiple occupancies, and why a daycare for toddlers is Institutional but a preschool is Educational.

📝 Key topics covered:

• All 10 IBC occupancy groups (A through U) with examples

• How occupancy classification drives height, area, egress, and fire protection

• The 50-person rule: when a space flips from Business to Assembly

• Mixed-use buildings: separated vs non-separated occupancies

• Where occupancy questions show up on the ARE exam

⏱️ Chapters:

(0:00) Intro to Occupancy Classifications

(2:00) What Are Occupancy Classifications?

(3:17) How Occupancies Affect Design

(5:14) Tour of Major Occupancy Groups

(11:52) Real-World Examples

(13:10) Mixed-Use Buildings

(14:02) Common Exam Traps

(15:25) Key Takeaways

📖 Read the full blog post

📝 Download the FREE Occupancy Classifications study notes

🎯 Get access to all ARE study materials with the ARE 101 Membership

🎯 Join our 10-week ARE Boot Camp

📚 Individual ARE Exam Courses:

• Building Codes 101

• PA 101 (Programming and Analysis)

• PPD 101 (Project Planning and Design)

• PDD 101 (Construction Documents and Specs)

• CE 101 (Construction and Evaluation)

• PcM 101 (Practice Management)

• PjM 101 (Project Management)

• CDT 101 (Construction Documents Technologist)

• CCCA 101 (Construction Contract Administration)

• Mechanical Systems 101

• AIA Contracts 101