Building Code Committee clarifies definitions for mixed-use and commercial buildings

In a recent meeting held by the Building Code Council on April 4, 2025, significant updates were proposed regarding the definitions and regulations surrounding residential and commercial buildings in Washington. The discussions primarily focused on clarifying the codes that govern mixed-use buildings, which often combine residential and commercial spaces.

One of the key proposals aimed to address confusion surrounding the classification of buildings that feature both residential units and commercial spaces. The proposal clarified that if a building contains a mix of residential units accessed from both exterior and interior corridors, it should comply with the commercial code. This change is intended to simplify enforcement for local jurisdictions, which have expressed challenges in determining which code applies to such mixed-use structures.

The council members engaged in a thorough discussion about the implications of this proposal. Some members raised concerns about the potential for confusion in the definitions, particularly regarding "I occupancies," which refer to institutional uses like assisted living facilities. The proposal initially included these definitions in both residential and commercial categories, leading to debates about their appropriateness. Ultimately, the council agreed to strike certain redundant elements to streamline the definitions and reduce ambiguity.

Another significant point of discussion was the percentage of units that would determine the applicable code. Suggestions were made to establish a threshold—such as 30% or 70%—to clarify when a building should be classified under commercial or residential codes. This proposal aims to provide flexibility for jurisdictions while ensuring that buildings are regulated appropriately based on their design and usage.

The council's decisions reflect a commitment to improving building regulations in a way that enhances clarity for developers and local governments alike. As these changes move forward, they are expected to have a direct impact on how mixed-use developments are constructed and regulated in Washington, ultimately shaping the landscape of residential and commercial spaces in communities across the state.

The meeting concluded with a consensus on the proposed changes, marking a step forward in addressing the complexities of building codes in a rapidly evolving urban environment. As these updates are implemented, residents and developers alike will benefit from clearer guidelines that support safe and efficient building practices.