# Smoke Alarm: Building Code Definition > How the IBC 2009, IFC 2009 define smoke alarm, where the wording differs, and which chapters depend on the term. - Canonical: https://harth.build/resources/glossary/smoke-alarm/ - Last updated: 2026-09-07 - Data source: Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control. ## Key facts | Fact | Value | | --- | --- | | Defined in | IBC 2009, IFC 2009 (2009 editions transcribed in this corpus) | | Primary source | IBC 2009 Fire Protection Systems (model text, not a jurisdiction's adopted text) | | Chapters using the term | 12 (counted across the codes hosted here) | | Wording identical across codes | Yes (compare before citing one code's wording under another) | ## Direct answer Smoke alarm is a defined term in the International Building Code (IBC) 2009, in Fire Protection Systems. The code's own words are: “A single- or multiple-station alarm responsive to smoke.” The IFC 2009 carries the same definition word for word, so the term means the same thing in each. The term is used in 12 chapters of this corpus, most often in Fire Protection Systems (IFC 2009), Fire Protection Systems (IBC 2009), Construction Requirements for Existing Buildings (IFC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted. Record the jurisdiction, the adopted edition, the application date and any local amendment that rewrites the definition before you use it on a live project, because a term redefined by amendment changes every requirement that depends on it. *Content and cited inputs reviewed by [Scott Barrington](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.* ## What does this term mean? **Smoke Alarm** — IBC 2009, Fire Protection Systems: > A single- or multiple-station alarm responsive to smoke. ![Labeled code-term definition diagram: Smoke Alarm: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/smoke-alarm/diagram-1344.webp) *How the IBC 2009, IFC 2009 define smoke alarm, where the wording differs, and which chapters depend on the term.* ## What must be verified before using this guidance? Two of the I-Codes in this corpus define **Smoke Alarm**, in identical words. | Code | Where it is defined | Definition | | --- | --- | --- | | IBC 2009 | [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/fire-protection-systems.md) | A single- or multiple-station alarm responsive to smoke. | | IFC 2009 | [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md) | A single- or multiple-station alarm responsive to smoke. | ## Where smoke alarm is used in the code The term appears in 12 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next. | Chapter | Code | Mentions | | --- | --- | --- | | [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md) | IFC 2009 | 98 | | [Fire Protection Systems](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/fire-protection-systems.md) | IBC 2009 | 94 | | [Construction Requirements for Existing Buildings](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/construction-requirements-for-existing-buildings.md) | IFC 2009 | 41 | | [Building Planning](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/building-planning.md) | IRC 2009 | 20 | | [Special Detailed Requirements Based on Use and Occupancy](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/special-detailed-requirements-based-on-use-and-occupancy.md) | IBC 2009 | 6 | | [Interior Finish, Decorative Materials and Furnishings](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/interior-finish-decorative-materials-and-furnishings.md) | IFC 2009 | 4 | | [Definitions](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/definitions.md) | IBC 2009 | 3 | | [Definitions](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/definitions.md) | IFC 2009 | 3 | | [Emergency Planning and Preparedness](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/emergency-planning-and-preparedness.md) | IFC 2009 | 2 | | [Definitions](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/definitions.md) | IRC 2009 | 2 | | [Means of Egress](https://harth.build/resources/building-codes/us-states/maryland/ibc-2009/means-of-egress.md) | IBC 2009 | 1 | | [Means of Egress](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/means-of-egress.md) | IFC 2009 | 1 | ### The term in use How the code actually writes about smoke alarm, quoted from the 2009 text hosted here: > Where more than one smoke alarm is required to be installed within an individual dwelling unit or sleeping unit in Group R-l, R-2, R-3 or R-4, the smoke alarms shall be interconnected in such a manner that the activation of one alarm will activate all of the alarms in the individual unit. — [IFC 2009 §907.2.11.3](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/fire-protection-systems.md) > Where more than one smoke alarm is required to be installed within an individual dwelling or sleeping unit, the smoke alarms shall be interconnected in such a manner that the activation of one alarm will activate all of the alarms in the individual unit. — [IFC 2009 §4603.7.2](https://harth.build/resources/building-codes/us-states/rhode-island/ifc-2009/construction-requirements-for-existing-buildings.md) ## Smoke Alarm: what to open, and in what order Every row is a document this term depends on. The [ICC code library](https://codes.iccsafe.org/codes) and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) cover the middle rows. | Check | Where | Confirmed | | --- | --- | --- | | Read the definition in the adopted IBC | Fire Protection Systems | | | Read the definition in the adopted IFC | Fire Protection Systems | | | Re-check the requirement that uses it | Fire Protection Systems (IFC 2009) | | | Re-check the requirement that uses it | Fire Protection Systems (IBC 2009) | | | Re-check the requirement that uses it | Construction Requirements for Existing Buildings (IFC 2009) | | | Re-check the requirement that uses it | Building Planning (IRC 2009) | | | Local amendment to any of the above | Jurisdiction's amendment list | | **A research aid, not a code determination.** The authority having jurisdiction decides which edition and which amendments apply. ## Where can you explore related guidance? - [Explore all glossary guidance](https://harth.build/resources/glossary.md) - [Automatic: Building Code Definition](https://harth.build/resources/glossary/automatic.md) - [Zone: Building Code Definition](https://harth.build/resources/glossary/zone.md) - [Automatic Sprinkler System: Building Code Definition](https://harth.build/resources/glossary/automatic-sprinkler-system.md) - [Fire Alarm System: Building Code Definition](https://harth.build/resources/glossary/fire-alarm-system.md) ## Sources and method Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control. ### Source links - [codes.iccsafe.org](https://codes.iccsafe.org/codes) - [iccsafe.org](https://www.iccsafe.org/advocacy/code-adoption-maps/) ## Frequently asked questions ### What is the code definition of smoke alarm? The International Building Code (IBC) 2009 defines it in Fire Protection Systems as: “A single- or multiple-station alarm responsive to smoke.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally. ### Which parts of the code depend on smoke alarm? In this corpus the term is used across 12 chapters, led by Fire Protection Systems in the IFC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own. --- - Continue in Harth (open this topic in the Harth agent): https://app.harth.build/agent?context=%2Fresources%2Fglossary%2Fsmoke-alarm%2F - View this page in a browser: https://harth.build/resources/glossary/smoke-alarm/ - All resources for agents: https://harth.build/llms.txt