Title 24 Requirements for Medical Offices in California

Healthcare facility is a defined term

Section 100.1 defines a healthcare facility as a health facility under Health and Safety Code Section 1250, or a clinic under Section 1204 that is located within a health facility. A medical practice in an ordinary office suite does not become one by being medical, so the building department decides how the practice is classified before the design starts.

The classification matters because the exceptions follow the term. Alterations to healthcare facilities are excepted from Section 141.0, ventilation follows Chapter 4 of the California Mechanical Code in place of Section 120.1, and Sections 120.2(e), 120.5, 130.1(b), 130.1(c) and 130.5(d) each carry an exception for healthcare facilities. A suite that is not one follows the ordinary rules throughout.

Setback controls and the continuous operation exception

Section 120.2(e) requires each space-conditioning system to shut off during periods of nonuse and to restart and temporarily operate as needed to hold a setback heating setpoint or a setup cooling setpoint. Its relief is narrow: systems serving healthcare facilities, systems of 2 kW or less with a readily accessible manual shut-off switch, and the climate exceptions for setback and setup. Exception 1 covers a system that serves an area that must operate continuously, but only where that is demonstrated to the satisfaction of the enforcing agency.

That last exception is specific, not general. A treatment room that really must run around the clock can be argued as continuous, while a room that is merely inconvenient to set back cannot, and the argument is made to the plan checker, not assumed on the drawings.

Ventilation follows expected occupancy

For a suite that is not a healthcare facility, Section 120.1 determines zone outdoor airflow from the expected number of occupants specified by the designer. A clinic with waiting areas, consulting rooms and procedure rooms has very uneven occupancy across a small floor plate, and the ventilation design reflects that rather than averaging it.

Lighting across many small rooms

A medical fit-out is typically a large number of small spaces rather than an open floor. Consulting rooms, procedure rooms, waiting areas, corridors and a small office block each carry their own lighting power density, and Table 140.6-C lists Exam/Treatment Room and Imaging Room only under the Healthcare Facility and Hospitals heading, so a suite outside that definition uses the nearest equivalent row.

Section 130.1(c)5 requires occupant sensing that shuts off all the lighting in 20 minutes or less in offices of 250 square feet or smaller, and in conference rooms, classrooms and restrooms. Offices larger than 250 square feet fall under Section 130.1(c)6D instead, which needs control zones of no more than 600 square feet that reduce to 20 percent of full power when vacant, and corridors sit on the Section 130.1(c)6 list in their own right.

Equipment loads that are not conditioning

Section 100.1 lists laboratories among the covered processes, and a covered process is a regulated component with its own documentation. A process space is narrower: one thermostatically held below 55 degrees F or above 90 degrees F for the whole space the system serves. Whether a given room is a conditioned space, a laboratory or a process space is worth establishing before the mechanical design is fixed, because imaging equipment on its own is not on the covered process list.

Fit-out or change of use

Medical tenants frequently take space that was general office. Where an alteration changes the occupancy classification, the requirements apply to the new occupancy — so the previous compliance of the shell carries nothing forward.

Where to go deeper

Ventilation carries more weight here than in a general office — see the commercial ventilation requirements. Note also that the exceptions in several sections are keyed to healthcare facilities, and that the relief from the electrical circuit separation requirements in Section 130.5(b) Exception 2 is keyed instead to electrical power distribution systems subject to California Electrical Code Article 517, so a medical fit-out is not simply an office fit-out with more air.

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