CO Detector Requirements in the District of Columbia: Homes, Rentals, and Hotels

Last verified: August 24, 2026

Between D.C. Code section 6-751.02 and 12-G DCMR section 310, District of Columbia carbon monoxide detector laws split into a statutory duty and a regulation that defines which units are covered. The framework covers homes, rentals, and qualifying lodging-related sleeping occupancies when trigger conditions such as fuel-burning appliances, fireplaces, attached garages, or certain permit-related project contexts apply. District rules also define placement, listing, power, and backup expectations for both standalone alarms and system-connected detection pathways.

Enforcement is handled through property maintenance oversight and civil infraction processes, so correction speed and documentation quality directly affect risk exposure. Because owner, tenant, and operator duties are split across the cited framework, compliance requires a documented, repeatable process.

One trap is worth carrying into the detail below. The District lets a tenant buy, install and maintain SMOKE alarms at the owner's expense after written notice and ten days, deducting the reasonable cost from rent under Property Maintenance Code 704.2. Section 310, which is the carbon monoxide section, grants nothing of the kind. A District tenant with a dead CO alarm has a fifteen-day owner duty and no self-help right behind it, and applying the 704.2 route to a CO alarm means acting on a right that does not exist for that device.

Quick Safety Summary

CO detector requirements for District of Columbia
Applies to homes?	Yes
Applies to rentals?	Yes
Applies to hotels/STRs?	Yes
Applies to schools?	Yes, under a condition
Applies to workplaces?	No

Schools and workplaces

Schools: it depends, and the test is one you can apply to the building itself. New work decides it, and the age of the building decides whether there is any duty at all. The District runs the 2017 Construction Codes, being the 2015 International Code Council family as amended by Title 12 DCMR and in effect since 29 May 2020. Section 915.1.1 of the Fire Code at 12-H DCMR requires carbon monoxide detection in "Group I-1, I-2, I-4 and R occupancies and in classrooms in Group E occupancies" in the Section 915.2 locations where a condition in Sections 915.1.2 through 915.1.6 exists. A District classroom is therefore covered where it holds a fuel-burning appliance or fireplace, is served by a fuel-burning forced-air furnace, sits in a building holding such equipment with an opening that communicates, or adjoins a private garage. An all-electric school with no attached garage meets none of them and owes nothing. Where a District classroom does owe something, Section 915.2.3 decides where the alarm has to be heard. It requires the signals to be "automatically transmitted to an on-site location that is staffed by school personnel", excepting a Group E occupancy with an occupant load of 30 or less. The 2015 edition is the one that introduced this alongside the Group E limb itself, so the District's 2015-based code carries it in its original form rather than in the stronger shape later editions gave it. A school building already standing goes the other way, and it takes both instruments with it. Section 1103.9 as the District publishes it reaches "existing Group I-1, I-2, I-4 and R occupancies" and names no Group E, the limb having entered that section only in the 2021 edition, so the retrofit chapter carries nothing to an older school. The Property Maintenance Code is shut for the same reason from the other side, 12-G DCMR Section 310.1 setting its scope to the same four groups. One warning before citing the District's 1103.9. It sends the reader to "Sections 908.7 through 908.12", which is where carbon monoxide sat in the 2012 family and is not where it sits in the 2015 one. The model 2015 text of that section points at Section 915, and Kentucky's 2015 view of it reads "in accordance with Section 915", so the older numbering is the District's own and travels with the amendment rather than with the edition.

Workplaces: District of Columbia places no carbon monoxide detection duty on an office, shop or other workplace. Federal and state occupational rules set an exposure limit for carbon monoxide in air; they do not require a detector to be installed, and this row is about installation. Both District instruments name their occupancies and neither names a workplace. The Property Maintenance Code at 12-G DCMR Section 310.1 covers Group I-1, I-2, I-4 and R occupancies. The Fire Code at 12-H DCMR carries Section 915 for new work and Section 1103.9 for buildings already standing, on the 2015 International Code Council family the 2017 District of Columbia Construction Codes adopt, and no edition of that section before the 2024 reorganisation reaches Group B, F, M or S. DC Official Code 30-201.06, the Short-Term Rental Regulation Act provision, requires a detector on every habitable floor of a short-term rental and reaches no place of work.

When Are CO Alarms Required?

Buildings with fuel-burning appliances
Buildings with attached garages
New construction
When building permits are required
Covered units include dwelling or sleeping units with listed risk conditions under 12-G DCMR 310.1.

Where to Install CO Alarms

Provide at least one alarm outside each separate sleeping area in the immediate vicinity of bedrooms in covered dwelling units.
Where a fuel-burning appliance sits inside a bedroom or its attached bathroom, the alarm goes inside that bedroom under 12-G DCMR 310.2.1.
Sleeping units get detection inside the unit under 12-G DCMR 310.2.2, and the corridor placement is the exception rather than the rule.

For detailed placement guidance beyond legal requirements, see where to place carbon monoxide detectors.

Device Requirements

Standalone alarms must be listed to UL 2034, and combination smoke-CO alarms must meet UL 2034 and UL 217 pathways.
System-connected CO detectors must follow UL 2075 and required fire-alarm integration pathways where applicable.
A carbon monoxide alarm in an existing occupied building is allowed to be solely battery operated; hardwired and plug-in devices need battery backup, and a combination smoke and carbon monoxide unit takes the stricter smoke alarm power rule.

Landlord and Tenant Responsibilities

Landlord: Owners and operators must provide required alarms and, in a rental unit, replace or repair a nonfunctioning device within 15 days of written notice from an occupant or tenant. Provision: 6-751.02.

Tenant: Occupants must provide written notice when alarms are missing or malfunctioning and avoid disabling required devices. Provision: 6-751.02.

Lease and operations documents should define notice workflow, repair timeline, and verification method.
The owner duties at 12-G DCMR 310.7, meaning the start-of-tenancy check, the fifteen-day repair clock and the annual inspection, run to housing businesses only, and the Property Maintenance Code defines a housing business to exclude hotels, inns, motels, bed and breakfasts, boarding houses and rooming houses. A District hotel owes the detection and the maintenance, not that schedule.

Full District of Columbia landlord and tenant carbon monoxide duties, with citations

Enforcement

Enforced by: District of Columbia Department of Buildings with civil infraction adjudication through Office of Administrative Hearings pathways.

Enforcement typically occurs:

During property maintenance inspections and complaint-based enforcement activity.
When required alarms are missing, inoperable, disconnected, or not installed per code.

Technical requirements come from 12-G DCMR section 310, while fine schedules are addressed through civil infraction rules.

What a Tenant Can Do in District of Columbia

When a carbon monoxide alarm stops working in a rented home in District of Columbia, these are the five routes a tenant can take and where each one comes from.

"Via general law" means the District of Columbia carbon monoxide statute itself is silent and the remedy comes from the state's landlord-tenant law instead. The remedy is available even though the alarm rule does not contain it.

"No provision found" is a finding rather than a gap in the research: the chapter that would carry that remedy was read and contains nothing either way. What was read is named beside the row.

Tenant remedies for a defective carbon monoxide alarm in District of Columbia, with the citation or the body of law searched for each.
Rent withholding	Via general lawD.C. Code 42-3651.03(b). A receivership the tenants can start themselves, which separates the District from Missouri, where only a public body has standing and a tenant can never begin. A majority of the tenants request the Attorney General to petition for a receiver of the rents; if the Attorney General denies the request or lets five working days pass without filing, the requestor may petition the Court directly. The grounds in 42-3651.02 reach a carbon monoxide defect by their own terms: a citation by the Department of Buildings under Title 12 or chapters 1 through 16 of Title 14 of the DCMR, posing a serious threat to health, safety or security, with the owner failing to abate. Rents then go to the receiver, so this diverts rent rather than letting a tenant keep it, and it needs neighbours as well as a citation.
Repair and deduct	No provision foundSearched: 12-G DCMR 310, the carbon monoxide alarm section of the Property Maintenance Code, read against the smoke alarm provisions at Property Maintenance Code 704.2 that carry the District's install-and-deduct right. Section 310 imposes duties on the owner and gives the tenant nothing to spend. The right that looks like the answer belongs to the other device: under 704.2 a tenant may purchase, install and maintain smoke alarms at the owner's expense after notifying in writing and allowing 10 days, with reasonable costs deductible from rent and no penalty for the deduction. Nothing equivalent appears for carbon monoxide, so a District tenant with a dead CO alarm has the 15-day duty in the next columns and no self-help behind it.
Right to end the lease	No provision foundSearched: D.C. Code Title 42, chapter 35 subchapter V on evictions and lease termination, and chapter 36 on tenant receivership, together with 12-G DCMR 310. No provision lets a tenant end the tenancy over an uncorrected defect. The District's statutory tenant terminations are status based, such as the notice available to a victim of an intrafamily offense at 42-3505.07, and the placarding rules operate on the District's decision to close a unit rather than on the tenant's. What a District tenant relies on instead is constructive eviction under the implied warranty of habitability that Javins v. First National Realty established, which is judge-made, requires the tenant to leave, and is proved after the fact rather than exercised on notice. It is described here rather than cited because it is a doctrine, not a section.
Notice the tenant must give	Yes, in the CO rule12-G DCMR 310.2.1. The carbon monoxide section itself makes written notification by an occupant or tenant the trigger, which puts the District in the small group with North Carolina, Virginia, Pennsylvania, Colorado and Wisconsin where the CO rule speaks to the tenant directly rather than only to the owner. No form beyond writing and no waiting period attach.
Landlord cure period	Yes, in the CO rule, 15 days12-G DCMR 310.2.1. Fifteen days from receipt of the written notification to replace or repair, the same figure and the same shape as North Carolina's 42-42(a)(7). The owner must also have a detector operable and in good repair at the beginning of each tenancy, so the duty exists independently of any complaint and the fifteen days is what a complaint buys.

Applies to every row above:The District splits its answers across two instruments and a doctrine, so the search_scope on each cell names which one applies. The carbon monoxide duty is regulatory, in the Property Maintenance Code at 12-G DCMR 310, and it is one of the few in this matrix written to respond to a tenant rather than to an inspector. The rent remedy is statutory, in the Tenant Receivership Act at D.C. Code 42-3651. Termination is neither: it descends from Javins v. First National Realty and lives as constructive eviction. One trap is worth naming so nobody re-finds it. The District does give tenants a right to install alarms at the owner's expense after 10 days and deduct the cost, and that right is written for smoke alarms under Property Maintenance Code 704.2. Section 310, the carbon monoxide section, grants the tenant nothing of the kind. Idaho sets the same trap from the other side, with an install-and-deduct that names smoke detectors only.

Remedies last checked 2026-08-03. Compare District of Columbia with the other states.

What District of Columbia Requires in Lodging

The District of Columbia carbon monoxide requirement reaches hotels and short-term rentals.

Hotels already standing: covered too. The District of Columbia requirement reaches an existing hotel and not only one being built.

Operator duty: A District hotel is a Group R occupancy, so 12-G DCMR 310.1 reaches it and 310.2.2 puts the detection inside the guest room unless neither the room nor its bathroom holds a fuel-burning appliance and no forced-air furnace serves it. The same duty arrives a second time through the Fire Code at 12-H DCMR, where IFC 915 covers new work and Section 1103.9 reaches existing Group R buildings with battery-only alarms permitted.

Full District of Columbia hotel and short-term rental requirements

Penalties for Non-Compliance

A carbon monoxide violation in the District runs as a civil infraction, and it is a Class 1 one, which is the most expensive class the schedule has. 16 DCMR 3309.1 lists five carbon monoxide provisions by name under the heading "Violation of any of the following provisions shall be a Class 1 infraction": failure to install the required detector, failure to install a single station or a combination device properly, failure to maintain a detection system, and failure to replace or repair within fifteen days of notification from an occupant. 16 DCMR 3201 then prices Class 1 at $2,000 for a first offence, $4,000 for a second, $8,000 for a third and $16,000 for a fourth and each one after. The doubling is the part to plan around: the fourth offence costs eight times the first, so a defect left uncorrected across inspections is not the headline figure repeated but an escalating one. Four of the fifty-one price each successive offence separately, and the District is the only one whose schedule doubles at every step: West Virginia runs $250, $750 and $2,000, Rhode Island $200, $500 and $1,000, and Montana opens at $50 to $100. Class 1 under 3200.1 covers infractions that are imminently dangerous to health, safety or welfare, which is where the District has put every alarm failure, the smoke ones included.

16 DCMR 3201 fine schedule, read in full on 2026-08-13 from two District government copies of the schedule that agree on every figure. The class definitions are at 3200.1. The class assignment is at 16 DCMR 3309.1, read 2026-08-23: five carbon monoxide provisions are listed there by name, and 3309.1 is the Class 1 subsection, verified by reading the section's four class lead-ins in order and confirming the carbon monoxide entries fall between the Class 1 and Class 2 headings. Smoke alarms are Class 1 as well, at 16 DCMR 3305 for the Smoke Detector Act and 16 DCMR 3306 for IPMC 704.2. Caveat on citation form: 3309.1 cites the provisions by the 2013 supplement numbering, which the 2017 code has since renumbered, so the section numbers in the schedule and in the current code do not line up even though the conduct described does.

Additional Notes

District compliance programs should keep code citations and corrective-action proof in each property file.
Permit-related projects should verify whether updated alarm pathways apply before final signoff.

Local Rules That Differ From State Law

We checked the municipal codes listed below and found no District of Columbia city rule that differs from the statewide requirement. The state rule is the operative one for those jurisdictions. Smaller municipalities were not all searched, so confirm with your local building or fire official before treating this as complete.

What was checked:Every other none_found on this site records a search that came back empty. This one records something different: there is nothing here that could be searched, because the District has no municipality inside it. The Organic Act of 1871 repealed the separate charters of Washington City, Georgetown and Washington County with effect from 1 June 1871 and put the whole District under a single municipal corporation. Since then the body that writes the District's carbon monoxide rules and the body that would write a local overlay have been the same body. D.C. Code Section 6-751.02 and 12-G DCMR Section 310 are simultaneously the statewide answer and the municipal one, and they apply uniformly across every ward and neighbourhood. Two things can still vary within the District and neither is a municipal overlay. The first is time rather than place: the Council legislates and the Department of Buildings makes rules, so 12-G DCMR Section 310 can change without any separate local process to watch. Anyone relying on a placement or device detail should check the current regulation rather than a summary. The second is private rather than public. Condominium associations, housing cooperatives and homeowner associations can impose safety requirements on the properties they govern, and those can exceed the District's rules, but they bind by contract and title rather than by ordinance, they are enforced by the association rather than by an inspector, and no register of them exists. An owner or operator inside such an association should read the governing documents alongside the District code. On 2026-08-11 every other negative on this site was re-tested against a defect in the publisher's search engine, which does not match plural forms and could therefore have hidden an ordinance from a search made in the singular. The District was excluded from that exercise and the reason is the same reason this entry exists at all: there is no municipal code here to search, so there is no search to have got wrong. The finding above is a fact about the Organic Act of 1871, not a result returned by a tool, and no improvement in searching can strengthen or weaken it.

Local sweep last reviewed 2026-08-10.

Official Sources & References

District of Columbia Department of Buildings, DC Construction Codes , Codes currently in effect, their model basis and the department caveat on integrated copies (state code, accessed 2026-08-24)
The currency check for the edition every code answer here is read against, and it answered directly rather than through a proxy. The department says "The 2017 DC Construction Codes consist of the 2015 International Code Council (ICC) family of model codes, the 2014 National Electrical Code, and 2013 ASHRAE 90.1, as amended by the District of Columbia Municipal Regulations (DCMR) Title 12", and that "The 2017 DC Construction Code takes effect on May 29, 2020". Six years on that is still the code in force, and no successor cycle is announced on the page. The department also warns that its integrated reference books "do not reflect all amendments adopted after May 29, 2020" and that "Title 12 DCMR should be used to confirm the official text", which is a limitation on every integrated copy of 12-H and 12-G DCMR, the ones read here included.
District of Columbia Official Code section 6-751.02 owner duty to install smoke and carbon monoxide alarms , 6-751.02 (state code, accessed 2026-02-17)
Primary statutory duty language for installation of smoke and carbon monoxide alarms.
12-G DCMR property maintenance code section 310 carbon monoxide alarms , 310.1 through 310.4 and 310.7 (building code, accessed 2026-02-17)
Trigger, placement, listing, installation, power, and responsibility requirements.
District of Columbia rules 16 DCMR section 3201 civil infractions fine schedule , 3201 (building code, accessed 2026-02-17)
Class-based fine schedule used for civil infraction penalty analysis.
District of Columbia Fire Code 2017, 12-H DCMR, being the 2015 International Fire Code as amended , 1103.9 with Table 1103.1, 1101.2.1 and 1101.3 (fire code, accessed 2026-08-09)
The second instrument reaching a District hotel. Section 1103.9 requires existing Group I-1, I-2, I-4 and R occupancies to carry carbon monoxide alarms, solely battery operated alarms permitted; Table 1103.1 lists 1103.9 as required rather than discretionary; 1101.2.1 set a twenty-four month deadline from adoption to file the permit application; 1101.3 lets the fire code official order an owner into compliance. Section 109.3 carries a criminal penalty the Property Maintenance Code route does not.
District Department of Buildings smoke and carbon monoxide alarm requirements guidance , Agency guidance PDF (agency guidance, accessed 2026-02-17)
Practical compliance and enforcement process guidance with code cross-references.

Disclaimer: This page explains the law as it stood on August 24, 2026. It is general information, not legal advice, and reading it creates no attorney-client relationship. Requirements vary by city, county and building type, and statutes and codes are amended: confirm the current text with the issuing authority before acting on it. Each requirement here cites the instrument it comes from, so you can check it at source.

Frequently Asked Questions

Which District of Columbia legal sources set carbon monoxide alarm duties?

Two sources set the duty: D.C. Code section 6-751.02 and the implementation requirements in 12-G DCMR section 310. Together, they define when alarms are required, how they should be installed, and how responsibility is split across owners, occupants, and operators. Compliance teams should reference both sources in one control document so policy and field execution stay aligned. District of Columbia programs that map each checklist item to a specific section are easier to defend during inspections, complaints, and enforcement follow-up.

Which properties and trigger conditions are covered in the District?

District of Columbia rules apply across homes, rentals, and covered lodging-related sleeping occupancies when listed risk conditions exist, including fuel-burning appliances, fireplaces, attached garages, and certain project contexts. Scope follows occupancy facts plus trigger facts rather than one broad property label. The District is unusual in reaching homes, rentals and lodging from a single framework, so the building type is rarely what decides the answer: D.C. Code 6-751.02 sets the statutory mandate and 12-G DCMR Section 310 carries the technical rules, and a rowhouse, an apartment and a guest room can each arrive at the same requirement by a different route through them.

Where must alarms be installed and what standards apply in DC?

District placement rules require alarms outside separate sleeping areas and story-level coverage in covered dwelling units. The cited framework also references UL 2034 for standalone alarms, UL 2034 plus UL 217 for combination units, and UL 2075 for certain system-connected detectors. Where primary building wiring is used, battery backup is required under 12-G DCMR Section 310. Those three listing standards are not interchangeable, and the distinction decides what a District inspector accepts: UL 2034 covers a standalone alarm, UL 2034 with UL 217 a combination smoke and carbon monoxide unit, and UL 2075 a detector wired into a system rather than one that sounds on its own.

What penalty exposure applies under District civil infraction pathways?

Carbon monoxide sits in Class 1, the top of the schedule. 16 DCMR 3309.1 names five carbon monoxide provisions under the Class 1 heading, covering failure to install, failure to install a single station or combination device properly, failure to maintain a detection system, and failure to replace or repair within fifteen days of an occupant's notification. 16 DCMR 3201 prices Class 1 at $2,000 for a first offence, $4,000 for a second, $8,000 for a third and $16,000 for a fourth and each one after, so the fourth costs eight times the first. Under 3200.1 a Class 1 infraction is one that is imminently dangerous to health, safety or welfare. Adjudication runs through the Office of Administrative Hearings rather than a court.

Are all-electric District units automatically exempt from CO alarm duties?

Not automatically. District of Columbia scope analysis should consider the full trigger list, occupancy profile, and code pathway instead of relying only on utility profile. Attached garages, adjacent risk sources, or permit-related project conditions can still affect requirements in some settings. Owners should record exemption determinations with section citations, reviewer identity, and decision date before finalizing policy. Reevaluate exemptions after renovations or occupancy changes to avoid stale compliance assumptions. District of Columbia teams should archive this memo with annual code review records.

For DMV operators, what is the main compliance contrast between DC and Maryland?

District of Columbia combines D.C. Code duty language with detailed DCMR technical and civil infraction pathways, while Maryland programs often rely on a different state and local code mix by occupancy. Regional operators should avoid one shared DMV template without state-specific branches. For side-by-side planning, review Maryland CO detector laws and compare trigger structure, enforcement channels, and documentation controls before deployment. District of Columbia rollout plans should document separate approval gates for DC and Maryland compliance branches.

Practical CO Detector Guides

Beyond legal requirements, these guides help you choose, install, and maintain CO alarms:

Where to place carbon monoxide detectors, room-by-room placement recommendations
CO detector beeping patterns, what different alarms mean
What to do if your detector goes off, emergency response checklist
CO resources and links, official agencies and safety information