San Francisco Single-Stair Housing Proposal Faces Scrutiny
San Francisco’s Department of Building Inspection has drafted guidelines that would allow qualifying four- to six-story apartment buildings to use one interior staircase alongside an additional exit. The proposal has drawn scrutiny from housing advocates over its approval requirements, fire-safety provisions and potential impact on residential development.
Key Takeaways
- The proposed guidelines cover qualifying apartment buildings between four and six stories
- Eligible projects would require approval to use one interior staircase with an additional exit
- Four-story buildings could use a fire escape as the secondary means of exit
- Five- and six-story buildings would require an exterior staircase extending to the roof
- Housing advocates question whether administrative guidelines can provide meaningful flexibility without a formal building-code amendment
San Francisco Drafts Guidelines for Single-Stair Apartment Buildings
San Francisco’s Department of Building Inspection has proposed a permitting approach that would allow qualifying mid-rise apartment projects to request approval for one interior staircase paired with a secondary exit.
The draft establishes a case-by-case review process rather than automatically permitting single-interior-stair designs. Developers would need to demonstrate compliance with building-safety requirements and obtain departmental approval.
The proposal addresses a design constraint affecting smaller residential buildings, particularly those on narrow or irregular lots. Requiring two interior staircases can limit the space available for apartments and other building functions.
However, the proposed alternative would retain a second means of exit. Housing advocates have questioned whether the administrative approach offers sufficient flexibility to address the restrictions they want changed.
Proposed Rules Set Additional Exit Requirements by Building Height
The proposed single-stair apartment design rules establish different requirements for four-story buildings and those with five or six stories. Both configurations would retain an additional means of exit.
For qualifying four-story apartment buildings, a fire escape could serve as the secondary exit. This would provide an alternative to installing two interior staircases, subject to the department’s approval.
Five- and six-story buildings would face stricter requirements. Under the draft, these developments would need an exterior staircase extending to the roof, rather than relying on a fire escape as the additional exit.
The distinction could influence how architects arrange residential units, corridors and other building features. An exterior staircase may free up interior space, but its placement must still satisfy applicable safety and access requirements.
The guidelines would not eliminate existing fire-safety obligations or automatically qualify every project within the specified height range. Each development would remain subject to the relevant design standards and review procedures.
Housing Advocates Question the Scope of the Draft Guidelines
Housing advocates have questioned whether the proposed guidelines would provide the regulatory changes needed to make single-stair apartment designs more widely available.
Their criticism centers on the difference between administrative guidance and a formal building-code amendment. Guidelines can establish procedures for reviewing alternative designs, while an amendment changes the underlying legal requirements.
Under the proposed approach, developers would continue seeking individual approvals rather than receiving general authorization to use a single interior staircase. Advocates argue that this could limit the practical benefits of the proposal, particularly for smaller projects operating within tight design and financial constraints.
The distinction also affects expectations for housing production. Allowing developers to request alternative staircase arrangements does not establish that additional apartments will be built or that construction costs will decline.
Any benefits would depend on whether the approved configurations provide workable layouts, meet safety standards and improve the financial feasibility of individual projects.
Building Approval Procedures Remain Central to the Proposal
The Department of Building Inspection’s draft places project-specific review at the center of the proposed process. Developers would need to establish eligibility, submit their designs and obtain approval before using an alternative staircase arrangement.
San Francisco’s revised transit housing strategy addresses zoning and residential density near public transportation. The single-stair proposal concerns a different aspect of development: how qualifying buildings provide access and emergency exits.
For architects and developers, the proposed guidance could influence early design decisions. Four-story projects could consider a fire escape as an additional exit, while taller qualifying buildings would need space for an exterior staircase extending to the roof.
These configurations would still need to comply with other applicable requirements, including fire protection, accessibility and building permits. Approval of a staircase arrangement would not replace the remaining development review process.
The practical value of the proposal would depend on how consistently the department applies its criteria and whether qualifying buildings can accommodate the required exits without creating other design constraints.
Review Process Will Determine the Proposal’s Next Steps
The Department of Building Inspection scheduled the draft guidelines for consideration by a panel of building-industry professionals on October 14, 2026.
The review process provides an opportunity to examine the proposed safety provisions, eligibility conditions and procedures for approving alternative staircase designs. Consideration of the draft does not, by itself, amend the building code or establish a final implementation date.
Further departmental action would determine whether the guidelines are adopted, revised or subjected to additional review. A formal building-code amendment would require a separate process.
For residential developers, the outcome will determine which configurations may qualify for consideration and how applications would be evaluated. Until the final requirements and implementation procedures are established, the proposal remains distinct from a generally available authorization for single-interior-stair apartment buildings.
Frequently asked questions
What is San Francisco’s proposed single-stair housing policy?
It is a draft set of guidelines that would allow qualifying four- to six-story apartment buildings to request approval for one interior staircase with an additional exit. Projects would remain subject to safety requirements and departmental review.
Which apartment buildings could qualify under the draft guidelines?
The proposal covers qualifying four-, five- and six-story residential buildings. Eligibility would depend on building height, the proposed exit arrangement and compliance with applicable requirements.
What additional exit requirements would apply to eligible buildings?
Four-story buildings could use a fire escape as the additional exit. Five- and six-story buildings would require an exterior staircase extending to the roof.
How do the proposed guidelines differ from a formal building-code amendment?
The draft guidelines establish an administrative approach for reviewing alternative staircase configurations. A formal amendment would change the governing building-code requirements through the applicable legislative or regulatory process.
What approval steps remain for San Francisco’s proposed stairway rules?
The draft was scheduled for review on October 14, 2026. Further departmental action would determine the final guidelines, eligibility conditions and procedures for approving qualifying projects.
