CodeMandatory
Carbon monoxide alarms required: every dwelling with attached garage or fuel-fired appliances
Virginia USBC 2021 Amendment 30 (IRC R315)Description
Carbon monoxide alarms shall be hard wired, plug-in or battery type; listed as complying with UL 2034. They shall be installed in every dwelling unit with an attached garage or fuel-fired appliances. When more than one CO alarm is installed, they shall be interconnected so activation of one causes all to alarm.
Why this exists
Standard residential CO alarm requirement; Virginia adds explicit interconnect provision for multi-alarm installations.
Categories
Life safety
Applies to
- Jurisdiction: Virginia
Source
Virginia DHCDauthoritative
2021 Virginia Construction Code (Part I of USBC) (2021)
Section: Amendment 30 (IRC R315)
Published 2024-01-18 · last verified 2026-05-10
Solver enforcement
Browsable only — the solver does not currently enforce this directive (no spec-level data to check against). This entry exists so the architect personas can cite it in conversation and the user can read what the rule says.
Related directives
- Garage / dwelling fire separation · IRC R302.6
- Habitable space minimum ceiling height · IRC R305.1
- Egress window net opening dimensions · IRC R310.2
- Stair riser, tread, and headroom · IRC R311.7
- Smoke alarms required throughout dwelling · IRC R314
Last reviewed 2026-05-10.