The UCC Administration and Enforcement regulation adopts the following codes for use throughout the Commonwealth of Pennsylvania :

• International Building Code 2003 (base code for commercial construction)
• ICC Electrical Code 2003 (utilizes National Electric Code 2002 standards)
• International Energy Conservation Code 2003
• International Existing Building Code 2003
• International Fire Code 2003
• International Fuel Gas Code 2003
• International Mechanical Code 2003
• International Performance Code for Buildings and Facilities 2003 (provides alternative compliance approach)
• International Plumbing Code 2003
• International Residential Code 2003 (code for one- and two-family dwellings no more than 3 stories in height)
• International Urban-Wildland Interface Code 2003

Act 13 of 2004 (HB 1654) also changed the residential stairway tread and riser standards adopted in the UCC regulation (those specified in the International Residential Code 2003). The standards to be used for residential stairways are those found in CABO One and Two Family Dwelling Code 1992.

The UCC regulations provide for the use of an alternative to Chapter 11 of the International Residential Code 2003, to demonstrate compliance with the energy conservation requirements of the UCC. This alternative approach was developed by the Pennsylvania Housing Research Center at Penn State University and is entitled Pennsylvania 's Alternative Residential Energy Provisions.