Appendix AQ now relates to BOTH foundation-based and movable tiny homes. The International Code Council (ICC), in collaboration with THIA, has published An Advisory on Tiny House Model Legislation containing simple language that can be embedded into laws for the adoption of residential building codes that permit a Movable Tiny House (MTH) to be used as a full-time residence. Of note, a MTH is also popularly known as a tiny house on wheels (THOW). The verbiage in this model legislation specifically references the International Residential Code (IRC), supplemented with the provisions for Tiny Houses contained in Appendix AQ (formerly known as Appendix Q). Contrary to the commonly held misconception that the IRC is not applicable to MTHs because they are built on wheels, the IRC has no provisions regarding the presence (or absence) of wheels. Read more details here.   The first application of the Appendix AQ for MTHs occurred in a planned unit development: Lake Dallas Tiny Home Village (LDTHV) is the first example of the Appendix Q being adopted locally for a specific use, within this planned unit development, and amended to allow for moveable tiny houses.  All MTHs in the community must comply with this building code (minus the chassis), be tied down, and utilize fire-resistant skirting. Permits are issued after third-party inspection to ensure it meets the Appendix Q, or reasonably meets the intent of the code. Learn more about LDTHV here.