The behavioral-health (BH) unit program is the space-by-space build-up of an inpatient psychiatric or crisis unit — bed count, bed types, clinical and support rooms, and the zoning logic that organizes them by acuity and risk. Getting the program and zoning right at the front end is the single highest-leverage decision in BH design, because it fixes patient flow, staff observation, separation of acuity populations, and the ligature-resistant envelope before a single fixture is selected.

What the unit program defines

A BH program documents the room-by-room composition of the unit and the operational assumptions behind it. Unlike a med-surg program, where the room sheet is largely a function of bed count and standard support ratios, a BH program is driven first by population — who the unit serves and at what acuity — and only then by bed count. The program is the contract between the owner, the clinical service line, and the design team, and it is the document against which the FGI-required functional program and the risk-assessment-driven design decisions are tested.

A complete BH unit program answers:

• Who is served — adult, geriatric, adolescent, child, co-occurring substance use, forensic/justice-involved, eating-disorder, or detox/withdrawal populations. Each population carries distinct adjacency, separation, and safety requirements.
• At what acuity — voluntary vs. involuntary, stable vs. acute, and the share of patients expected to need seclusion, restraint, or 1:1 (constant) observation.
• How many beds, and in what configuration — single vs. semi-private rooms, the count of high-observation/high-acuity beds, and any flex beds.
• What clinical and therapeutic spaces support the milieu — group rooms, activity/OT spaces, quiet/sensory rooms, exam/treatment, seclusion, and consult/telepsychiatry.
• What support and staff spaces are required — nurse station, medication room, soiled/clean utility, nourishment, staff respite/safe areas, and secure storage for contraband and patient belongings.
• The governing functional program and code basis — FGI Guidelines occupancy and unit-type classification, the applicable risk-level standard, and the AHJ.

Governing standards and the functional-program basis

The BH program is bounded by a stack of codes and standards that should be named explicitly in the functional program so downstream design decisions are traceable.

• FGI Guidelines for Design and Construction of Hospitals is the primary space-program authority in most U.S. jurisdictions. It defines psychiatric nursing-unit requirements, single- vs. multi-bed room rules, support-space minimums, seclusion-room and special-care requirements, and — critically — directs the project team to perform a patient-safety risk assessment (PSRA) that calibrates ligature-resistant design intensity to the served population and acuity. The current FGI cycle also distinguishes general psychiatric units from specialty environments and addresses items such as required clearances, door and observation provisions, and outdoor-access expectations.
• IBC occupancy classification — most inpatient psychiatric units are Institutional Group I-2 (the same occupancy as a hospital), with the attendant smoke-compartment, corridor, and means-of-egress requirements. Locked-unit egress is reconciled with NFPA 101 special-locking and clinical-needs provisions, coordinated with the AHJ.
• NFPA 101 Life Safety Code / NFPA 99 Health Care Facilities Code govern egress, locking arrangements (delayed/controlled egress, clinical-needs locking), and the risk-based systems framework for a locked health care environment.
• CMS Conditions of Participation and the deemed-status accreditors — The Joint Commission (TJC) and DNV — drive the operational safety expectations that the physical program must support, most notably the environment-of-care and ligature-risk expectations. CMS and TJC have, in effect, set the national bar for ligature-resistant inpatient psychiatric environments; the program must reserve the space and adjacencies that make compliant rooms and observation possible.
• State behavioral-health licensing authorities and risk-level frameworks add jurisdiction-specific program requirements. The New York State Office of Mental Health (NYS-OMH) patient-safety standards and the widely referenced VA-derived mental-health environment-of-care risk-level model (Levels I–V) are common reference frameworks for grading how aggressively a given space must be hardened. Many states layer their own square-footage minimums, bed-count caps per unit, and outdoor-access mandates.
• ADA / ABA accessibility standards apply to accessible patient rooms, toilet/bathing rooms, and common areas; their hardware and clearance requirements must be reconciled with anti-ligature hardware selections in the room-level design.

The sibling Article on FGI / Joint Commission / NYS-OMH and risk-level standards treats this stack in depth; here the point is that the program must declare its standard basis up front, because the risk level and population choices ripple through every room on the sheet.

Bed types and the acuity spectrum