For some reason there is a lot of confusion in regards to the upcoming changes in PA. A very good friend of mine is an electrical inspector for a very larg company. He has been an inspector for over 15 years. I spoke to him about this about 3 weeks ago. Hopefully things will / are sorting out. I went to Philadelphia’s L and I website and found the following. This is only for the city, not the rest of the state.
The Philadelphia Building Construction and Occupancy Code contains the local modifications to the adopted ICC codes. Please be aware that for plumbing-related items, Philadelphia currently uses the Philadelphia Plumbing Code and does not use the International Plumbing Code or the plumbing provisions of the International Residential Code.
The 2018 International Codes (ICC Codes) and the 2015 International Residential Code (IRC) become effective October 1, 2018. Pursuant to the UCC, if a design or construction contract for proposed work was signed before October 1, 2018, the permit application may comply with the 2010 Philadelphia Building Code (2009 ICC Codes), with reference to the accessibility provisions of the 2015 International Building Code.
Applications filed on or after April 1, 2019, must comply with the 2018 Philadelphia Code, incorporating the 2018 ICC Codes (and the 2015 IRC) with local and state modifications.