San Francisco’s Section 207.3 Dwelling Unit Legalization Program is a local path for certain existing unauthorized dwelling units converted from unused space. It is distinct from a general accessory dwelling unit permit route. The Planning Department’s FAQ says the program can legalize one unwarranted unit per lot, subject to eligibility and safety conditions, and that the Department of Building Inspection (DBI) decides whether an applicant may enroll.

Start with DBI screening and Planning review

The City directs property owners to begin with DBI. An initial screening may provide an informal estimate of legalization costs, but it is non-binding and does not approve a unit. Before submitting a building-permit application to DBI, an owner must submit a Planning project application and receive a Planning Approval Letter. The particular plans, forms, permits and sequence must be confirmed with the responsible departments.

The FAQ describes limited Planning Code waivers for matters including density, rear yard, open space, light and air exposure, and parking. Other Planning Code conditions remain, and legalization cannot create or intensify a nonconformity for an existing legal dwelling. All applicable Building Code requirements still apply, including ceiling height, ventilation, light, fire safety and egress. A pre-application meeting may identify whether an equivalency is available, but only the authorities can decide what is acceptable for the property.

Check continuing restrictions

The FAQ lists program limits tied to certain eviction histories. A legalized unit cannot be subdivided and sold separately. If the unit was subject to San Francisco rent stabilization before legalization, the City says that coverage continues afterward. These conditions can affect eligibility and future use, so review the exact notice history and current Planning Code with the City before relying on the program.

The San Francisco FAQ was updated May 10, 2026; check current code, forms and intake before applying. A screening, Planning Approval Letter or building permit addresses a particular stage, not every aspect of a property’s legal status. Confirm required corrections, inspections and final permit status with DBI, Planning and other agencies.