New zoning rules permit duplex splits for separate ownership in Bellevue

The City of Newcastle's Planning Commission meeting on April 25, 2025, focused on significant changes to local housing regulations, particularly regarding the development of accessory dwelling units (ADUs) and duplexes. The discussions highlighted the potential for increased housing density and ownership flexibility within the city.

One of the primary topics addressed was the new framework for allowing duplexes on lots. The commission discussed how this change would enable property owners to create separate ownership structures within a duplex. By implementing a system of "parent lots" and "child lots," property owners could effectively split a duplex into two distinct units, each with its own lot line for tax purposes. This approach allows for the sale of either half of the duplex as a separate entity, enhancing property value and ownership opportunities.

The commission emphasized that while these new lots would not be fully independent in the traditional sense, they would provide a mechanism for assigning ownership without imposing strict setback requirements that could hinder construction. The larger parent lot would still dictate the dimensional standards, ensuring that the duplex meets all necessary regulations while allowing for more flexible use of the land.

Visual aids were presented during the meeting, illustrating how this model has been successfully implemented in neighboring Bellevue. The images contrasted traditional housing layouts with the proposed duplex configurations, showcasing how multiple owners could coexist within a single structure while adhering to the overarching zoning regulations of the larger lot.

In conclusion, the Planning Commission's discussions on April 25 set the stage for a transformative approach to housing in Newcastle, aiming to increase density and provide more options for homeownership. The next steps will involve drafting specific regulations to implement these changes, with further community engagement anticipated to refine the proposal.