Seattle Council approves code updates for office to residential conversions

The SBCC WSEC-C TAG Meeting held on May 9, 2025, focused on significant updates to building codes in Washington, particularly regarding energy efficiency and compliance standards. The meeting, attended by various stakeholders, aimed to address proposals that would streamline regulations and enhance clarity in the conversion of buildings.

The first major discussion revolved around the conversion of office towers to residential units. Participants emphasized the need to update existing systems, such as water heating and space heating, to meet current code requirements. A proposal was made to strike certain language from the code, suggesting that buildings less than 25 years old could retain their envelope while still being converted to residential use. This proposal received support, with a motion to approve it as modified passing unanimously.

Next, the committee reviewed a proposal concerning lighting requirements during a change of use. This proposal clarified that installed lighting wattage must comply with current codes, while lighting controls should be updated based on the new use type. The motion to approve this proposal also passed without opposition.

The final significant topic addressed was the review of Appendix A of the energy code. Nathan Miller presented findings from a task force that examined the appendix for duplicative and outdated information. The goal was to retain only unique tables relevant to Washington state while referencing ASHRAE 90.1 for default performance values. The committee expressed strong support for this cleanup effort, recognizing the importance of maintaining accurate and relevant information in the code.

Throughout the meeting, participants highlighted the need for clarity and consistency in building regulations, particularly as they relate to energy efficiency and compliance. The discussions underscored a collaborative effort to modernize Washington's building codes, ensuring they align with current practices and standards.

In conclusion, the meeting successfully addressed key proposals aimed at improving building code clarity and compliance, with all motions passing smoothly. The next steps will involve further review and implementation of the approved changes, ensuring that Washington's building regulations remain effective and relevant.