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The International Existing Building Code (IEBC) is the I-Code that covers existing buildings in depth. While the International Building Code (IBC) covers changes of occupancy in existing buildings, the IEBC goes into much greater detail. When you're doing a change of occupancy, see if your municipality has adopted it.

In the 2006 IEBC there is a table that lists the relative hazard with regards to egress. This allows you to evaluate if your change of occupancy is moving to a higher, lower or equal hazard. The categories are as follows:

1 (the highest hazard) is only for H occupancy

2 is for I-2, I-3 and I-4 occupancies

3 is for A, E, I-1, M, R-1, R-2 and R-4 occupancies

4 is for B, F-1, R-3 and S-1 occupancies

5 (the lowest hazard) is for F-2, S-2 and U occupancies

1. Classification of Work and Scope in the Existing Building Code
2. Change of Occupancy in the International Building Code
3. Accessory Occupancies in the International Building Code
4. When Do You Need More Than One Door? – Spaces That Require More Than One Means of Egress
5. Change of Occupancy and Conformance with Code
6. Egress Windows Swinging In – Acceptable in Building Code
7. Assembly Occupancy Groups as Defined in the International Building Code
8. Alterations, Restoration and Accessibility in Historic Buildings – IBC