Piedmont publishes a local list of building-code items that may be relevant when legalizing an existing accessory dwelling unit (ADU) or junior ADU (JADU). The list is a screening aid, not a complete code checklist or a finding that a unit is safe. The City’s current permit process, adopted code and inspection determine what applies to a particular structure.
Items Piedmont says to check
The City’s page identifies adequate insulation, lighting, ventilation and heat; a side-hinged exterior door; direct access to the unit’s electrical panel or disconnect; and emergency escape windows for sleeping rooms. It also lists other conditions tied to the unit’s construction. For example, a converted garage may require a vapor retarder over the slab, and the City says garage openings into sleeping rooms are not allowed under the cited rule. The page identifies a sewer-line check in a stated five-existing-bathroom scenario and specific treatment of gas appliances located in sleeping areas or bathrooms.
Piedmont’s list also describes fire separation between a detached ADU and the main home when they are less than ten feet apart: the City cites a one-hour-rated wall and 45-minute-rated openings in that wall. It lists heating and room requirements and, for JADUs, owner-occupancy and a recorded deed restriction. These details depend on measurements, unit classification, the applicable code edition and site conditions. Do not assume a listed assembly or dimension applies without City review.
Use the checklist to prepare for permit review
Before estimating work, gather the permit history, approved plans, construction details and measurements that Piedmont may need to classify the unit and inspect concealed work. Ask the Building Division which items apply and what must be exposed, repaired or permitted. A checklist page does not replace an inspection, and no single item establishes approval of the ADU as a whole.
Review Piedmont’s current existing-ADU building-code guidance alongside the City’s permit instructions. Have qualified professionals and the responsible authority assess safety-sensitive construction. For general guidance on planning corrective work, see how existing ADU corrections are assessed.