Permission to build or occupy a secondary dwelling does not decide whether it can be sold as a separate property. Separate ownership may require a subdivision, condominium or strata plan, new parcel or address, utility arrangements, association documents, and registration with the land registry. Some authorities prohibit separation for a particular type of unit; others provide a path subject to detailed conditions.
Find the legal route before making a sale plan
Identify the municipality and the legal description of the property. Ask the planning or land-development authority whether the local rules allow the unit to be independently conveyed, then check the land-registry and condominium or strata rules that govern the proposed form of ownership. Confirm whether the route applies to this unit type and parcel, whether the dwelling must already have permits or an occupancy certificate, and what happens to the primary home and common areas.
An approved path can still require several separate decisions. San José, California, describes an ADU condominium-conversion process that begins with a city checklist and proceeds through a Parcel Map application. Its guidance requires additional documents and describes recording the map, condominium plan, association documents, and covenants before requesting a separate address. This is a local implementation path, not a guarantee that a particular property qualifies. The City’s current checklist and project-specific review control.
The City of San Diego also describes a separate-conveyance route for ADUs through condominium subdivision, with inspection, utility-notice, lienholder, marketing, and covenant requirements. It is a City process with affordability and housing-assistance limits, distinct from the unincorporated County process; see the San Diego City separate-sale guide for the current checklist.
Other places set different boundaries. British Columbia homeowner guidance says the main home and secondary suite or ADU form one real-estate entity that cannot be legally divided under that guidance. Vancouver says a laneway house cannot be strata-titled or sold separately from the main house. Kauai County’s cited rule keeps a guest house or additional rental unit in the same condominium unit as its primary dwelling. These examples are not contradictory universal rules; they apply to different authorities, legal mechanisms, and unit categories.
Some local policies connect separate sale to the unit’s planning relationship with the main home. Rother District Council’s adopted Policy DHG10 expects an annexe to remain ancillary and says its occupation should be controlled to prohibit a separate dwelling and separate sale; the Rother guide explains the local policy criteria. Unincorporated Miami-Dade County prohibits separate sale of an accessory unit from the principal dwelling. Orlando’s City guide likewise says the ADU and main house must have the same owner, while a lot split may be possible only if the resulting lots meet the separate Tandem Single Family requirements. A possible qualifying lot split is not a sale right for the ADU as it stands.
Other authorities describe a conveyance pathway rather than a general prohibition. Bellevue says its reform removed the condominium prohibition for the attached ADUs covered by that change, but current code and subdivision requirements still control; see the Bellevue guide. San Francisco Planning Code § 207.4 allows separate conveyance only for certain ADUs approved under specified state-mandated ministerial programs and only with subdivision approval; see the San Francisco guide. The City says an ADU construction application may be submitted with a parcel-subdivision application, but filing together does not guarantee either approval.
Philadelphia’s local owner-occupancy condition also requires a recorded affidavit and deed restriction before final occupancy; review that instrument as well as any sale route. San Mateo’s current code prohibits separate ADU sale except as allowed by California Government Code § 66341, bars separate JADU sale, and imposes a 30-day rental minimum. The state-law exception is qualified and does not establish that a particular parcel or buyer is eligible. For another example in which owner occupancy and a recorded instrument are linked before an ADU certificate of occupancy, see the Kansas City guide.
Review property documents as well as public rules
Before relying on a separate-sale option, obtain a current title search and review easements, mortgages, liens, covenants, condominium or strata documents, HOA or association restrictions, and any affordability or assistance agreement. Confirm whether a lender or other secured party must consent. A local planning page may describe a process without confirming title eligibility, utility capacity, map approval, recordation, or the status of an existing unit.
Oregon has a statutory limit on some recorded restrictions that conflict with housing allowed under its ADU law. Under the current text of ORS 93.277, a provision in a recorded instrument is not enforceable if it would allow a single-unit dwelling but prohibit development of, or partitioning or subdividing for, an ADU allowed under ORS 197A.425(1). For this ADU provision, the statute applies to covered instruments executed on or after January 1, 2021. Separate instrument-date rules apply to the statute’s manufactured-dwelling and prefabricated-structure provisions. Amendments shown on the Oregon Legislature page for January 1, 2027 are future-effective and should not be treated as current law before that date. This state rule does not approve a project, guarantee a parcel division or transfer, or replace review of the actual recorded instrument, local approvals, and current statute.
Do not advertise an ADU as separately saleable solely because it has its own entrance, kitchen, address, or utility meter. Those physical features do not create a separately transferable legal parcel or condominium interest. Ask the relevant planning, surveying, and land-registration professionals what approvals and documents are needed for the exact property. For a purchase or transfer, obtain advice based on the current title and governing instruments; this overview is not a title opinion.