Pennsylvania’s construction community is preparing for a significant code update in 2025. Starting July 13, 2025, the state will officially adopt the 2021 International Code Council (ICC) building codes. This includes updates to several important standards such as the International Residential Code (IRC) and the International Energy Conservation Code (IECC). These changes, approved by Pennsylvania’s Uniform Construction Code (UCC) Review and Advisory Council (RAC), reflect a broader commitment to improving building safety, energy performance, and long-term sustainability in residential construction.
For York Builders Association (YBA) members, staying informed and prepared is key to avoiding delays, cost overruns, and compliance issues. Whether you’re a builder, remodeler, contractor, or designer, understanding these updates will be crucial as they begin to affect permitting and inspections across the state.
Key Code Changes for Residential Builders
Transition from 2018 to 2021 ICC Codes
The most significant change is the replacement of the 2018 ICC code series with the 2021 versions. This affects nearly every facet of residential building, from framing techniques to mechanical systems and safety protocols. For example, new rules related to emergency escape and rescue openings (EEROs), updated stair geometry, and fire protection measures will become the new standard. Builders must familiarize themselves with these changes to ensure that new construction and renovations pass inspection under the revised regulations.
Big Push for Energy Efficiency
The 2021 IECC introduces a stronger emphasis on building performance and energy savings. Residential builders will need to meet more rigorous requirements for insulation, air sealing, and mechanical system efficiency. Specific updates include:
- Increased insulation values (R-values) for wall assemblies and slabs
- More comprehensive blower door testing to assess building envelope leakage
- Updated requirements for duct sealing and HVAC system design
- Adjustments to climate zone maps that may alter compliance needs based on location
Pennsylvania will continue to offer the PA Alternative Residential Energy Provisions (PA-Alt) as an optional compliance path, providing some flexibility for builders while still achieving energy conservation goals.
Compliance and Phase-In Options
Projects with signed construction or design contracts dated before July 13, 2025, may still proceed under the 2018 code, provided that the necessary permits are filed within six months of the effective date. This grace period offers a transitional buffer, but builders must act quickly to meet that deadline. Any projects without qualifying documentation will be required to comply with the 2021 codes in full.
Preparing for the Transition
To navigate this shift smoothly, YBA members should take several proactive steps:
Review the Code Updates
Access the full text of the 2021 I-Codes and Pennsylvania-specific amendments through the Pennsylvania Housing Research Center (PHRC) or the Department of Labor & Industry. These documents offer side-by-side comparisons and highlight what has changed from previous code editions.
Evaluate Energy Compliance Paths
Decide whether to follow the standard IECC route or take advantage of the PA-Alt compliance path, which is customized to Pennsylvania’s climate and housing stock. Consider consulting an energy code specialist to ensure your designs are both compliant and cost-effective.
Consult with Local Code Officials
Enforcement procedures and interpretations can vary by municipality. Speak directly with local code officials to understand how the new codes will be applied in your jurisdiction, especially if your area opted out of full local enforcement under the UCC.
Update Project Plans and Processes
Ensure that upcoming projects scheduled for mid to late 2025 are being designed and budgeted with the new codes in mind. This includes updating architectural plans, material selections, and subcontractor scopes of work to reflect the 2021 standards.
By staying ahead of these changes, YBA members can maintain project momentum, avoid costly rework, and continue delivering high-quality homes that meet evolving safety and efficiency benchmarks.
