PA Existing Building Code (from UpCodes):
601.1 Scope The provisions of this chapter shall be used in conjunction with Chapters 7 through 12 and shall apply to the alteration, addition and change of occupancy of existing structures, including historic and moved structures, as referenced in Section 301.3.2. The work performed on an existing building shall be classified in accordance with this chapter.
601.1.1 Compliance With Other Alternatives
Alterations, additions and changes of occupancy to existing structures shall comply with the provisions of Chapters 7 through 12 or with one of the alternatives provided in Section 301.3.
So ... classification of work into Level 1, Level 2, or Level 3 applies only to chapters 7 through 12.
Chapter 7 ==> Alterations - Level 1
Chapter 8 ==> Alterations - Level 2
Chapter 9 ==> Alterations - Level 3
Chapter 10 ==> Change of Occupancy
Chapter 11 ==> Additions
Chapter 12 ==> Historic Buildings
The prescriptive Method is chapter 5. Since chapter 6, Classification of Work, applies only to chapters 7 through 12, it obviously does not apply to the Prescriptive Method (chapter 5) or to the Performance Method (chapter 13). Therefore, section 807 doesn't apply under the Prescriptive Method unless there is something in chapter 3 or chapter 5 that tells us it applies.
This is why the applicant NEEDS to tell us up front what compliance method they are using. Generally, they have no idea -- they just draw plans without ever opening up the IEBC. We routinely reject alteration plans that don't declare the compliance method, and the questions we receive in response clearly show that the designers don't have any idea what the IEBC says.
Also, if they are using the Work Area Method, the IEBC says they have to show the work area(s) on the plans. It's very rare to see that done on a first submittal.