San Francisco's Ceiling-Height Vote Goes After the Costliest Fix in an Unwarranted Unit. The Sale Still Runs on Paper.

Every San Francisco home sale includes one required document that many sellers first see only when escrow is already open. It's called the Report of Residential Building Record, or 3R report. With narrow exceptions, the owner or the owner's agent must get it from the City and deliver it to the buyer before closing. The buyer then files a receipt with the Department of Building Inspection. The 3R report costs $379 per residential building on a lot, or $388.48 with the online card fee, and DBI lists a turnaround of seven to ten business days.

The report states the authorized occupancy and use the City has recorded, along with the original use, the zoning, the construction date and the permits for construction, conversion and alteration. If a house has a finished ground floor with a bath, a kitchenette and its own door, but the report lists one dwelling unit, the buyer can see that gap on an official City document. According to the San Francisco Building Code text, the report warns that other uses may be illegal and subject to removal or abatement, and that errors in the report do not stop the City from enforcing against the seller, the buyer or later owners.

That is why the Board of Supervisors' vote on October 27 matters to anyone selling a house with an unwarranted downstairs unit. It targets the single most expensive item on the legalization checklist. It leaves the rest of the checklist alone, and it doesn't change what the 3R report shows.

What the Board passed

Board File No. 260623, "Housing Code – Ceiling Heights," was introduced June 2, 2026, by Supervisor Alan Wong. Its cosponsors are Supervisors Dorsey, Sherrill, Sauter, Melgar, Mahmood, Chyanne Chen and Mandelman. The Board finally passed it on October 27, 2026, and sent it to the Mayor's Office.

The revised legislative digest summarizes the change. Today the Housing Code requires 7 feet 6 inches for habitable rooms and 7 feet for all other rooms. The ordinance lowers those minimums to 7 feet and 6 feet 8 inches, which matches Section R313.1 of the California Residential Code. The ordinance text amends Housing Code Section 503(a) and applies to habitable rooms in existing buildings. It takes effect on the 31st day after enactment. Enactment happens when the Mayor signs it, returns it unsigned, or doesn't sign it within ten days of receiving it, or when the Board overrides a mayoral veto.

The bill grew out of a contest. In spring 2026, Wong asked residents to submit city rules they considered outdated. KRON4 and Bay City News reported that the winning entry was the 7-foot-6-inch habitable-room rule, and that a Sunset resident, Mike Nohr, had submitted the same rule. Wong explained the stakes in that report:

"That 6-inch difference may sound small. But in practice, it can create a major barrier for homeowners trying to legalize existing in-law units, basement units and ADUs."

Why six inches drove the cost

The winning submission came from a homeowner whose case the San Francisco Chronicle covered in December 2025. Her house is a 1904 Edwardian. Decades before she bought it, a previous owner had turned the lower level into two studios without permits, with 7-foot ceilings. That height meets the state minimum and falls six inches short of San Francisco's. The Chronicle reported that two architects estimated $750,000 and at least $1 million to bring that home's units into compliance.

The same Chronicle article explains why the number is so high. Steve Edrington, an ADU architect with Adapt Dwellings, said units like these usually need the foundation excavated and underpinned to lower the floor. That work often brings in seismic retrofitting, drainage and waterproofing, new stairs or egress, and utility updates. Those estimates come from one house and aren't a citywide average. They do show where the money goes. The six inches is what forces the structural work.

The 2008 inspection the Chronicle described listed several other items besides the ceiling:

1. Unapproved wiring and plumbing
2. No approved smoke detectors
3. No approved permanent heat source
4. Unapproved windows or doors for light, ventilation and escape
5. No approved second means of egress
6. Ceiling height

In that case the electrical problem was fixed within weeks. The owner filed a permit, hired a contractor, and a follow-up inspection about six weeks later found it resolved. The case over the illegal unit itself stayed open. Wiring, detectors and heat are contractor-scale jobs. Ceiling height and sometimes egress are foundation-scale jobs. File 260623 addresses the ceiling. The other items on the list still apply.

Housing Code and Building Code are separate rules

The ordinance amends the Housing Code. The Chronicle reported that City officials said a state law, AB 2533, didn't solve that homeowner's ceiling problem because the ceiling rule fell under the Building Code, not the Health and Safety Code. San Francisco's current building codes page says permit applications filed on or after January 1, 2026, must use the 2025 California Codes and the 2025 San Francisco amendments.

The Building Inspection Commission saw the gap. Its July 16, 2026 transmittal says its Code Advisory Committee proposed clarifying amendments "to ensure proper applicability and implementation." It also asked DBI to issue an information sheet. The full Commission recommended approval unanimously "following an extensive discussion, and substantial concern raised by the BIC." How the new Housing Code minimum will apply when DBI reviews a legalization permit is the question that DBI information sheet is supposed to answer. A seller planning around the vote needs that answer for their specific house.

The routes to legalization in 2026

The vote adds to legalization programs that already exist. Each one has its own cutoff date and its own limits.

The City's Unit Legalization Program starts with a licensed architect, contractor, or civil or structural engineer assessing the unit and completing a screening form. The applicant needs whole-building floor plans, a site plan and proof that the unit existed before 2013. SF Planning's program FAQ lists ceiling height, ventilation, light, fire safety and egress among the Building Code requirements that still apply. Under Government Code Section 66311.7, a homeowner can get a confidential inspection from a licensed contractor before applying. SF Planning also notes that some unauthorized units can go through the Local or State ADU programs, and that State-program ADUs get ministerial review within 60 days of a complete application.

Two other City changes are part of the 2026 picture. Ordinance 222-25 brought the City's state-mandated ADU process in line with state law and removed Board of Appeals appeals. It took effect December 22, 2025. Since September 14, 2026, no-plan electrical and plumbing permits have been filed only online through PermitSF. That covers the kind of permit the Chronicle case used to clear its wiring violation.

What a buyer can and can't see

This part affects pricing. The 3R report doesn't include plumbing, electrical or commercial permits. It also isn't a physical inspection. A downstairs unit that has had its wiring permitted and its smoke detectors and heat brought up to standard will still show on the 3R report as an unauthorized use until it is actually legalized. A unit where none of that work has been done looks the same on the report. Both get the same official answer, and the difference shows up only in the permit history and the inspection.

So for a seller, documentation is worth more than the vote. A screening-form assessment from a licensed professional, permits pulled for the contractor-scale items, and DBI's eventual guidance on how the 7-foot minimum applies all give a buyer something to price beyond what the 3R report says. A unit can be legalized, but it can't be sold separately, and rent control still applies where the building is covered. Legalization makes the space a recorded, rentable part of the house. It doesn't create a separate asset.

The program rules, state statutes and ordinance status above are general information, not legal, tax or financial advice. Confirm how they apply to your property with a licensed architect or engineer, a real estate attorney, and DBI.

Quick answers

Is the 7-foot minimum in effect now? The Board finally passed it on October 27, 2026. It takes effect on the 31st day after enactment, and the Legistar file tracks its status.

Will a 3R report show my downstairs unit? It shows the authorized use the City has recorded. An unpermitted unit won't appear as an authorized dwelling, and the report doesn't list plumbing or electrical permits.

Does the Unit Legalization Program cover a unit built in 2015? The local program's cutoff is January 1, 2013. AB 2533's protections reach ADUs and JADUs built before January 1, 2020.

If your house has a downstairs unit and you're thinking about a sale in 2026, NEXTGEN Properties can help you plan the order of steps: order the 3R report early, bring in the right licensed professional for an assessment, and decide whether financed pre-sale work on the contractor-scale items makes sense before you list. Book a complimentary home strategy session, available in English, Mandarin or Cantonese, and we'll go through your property's record with you.