What New Mexico Requires for CO Detectors Under IRC Code

Last verified: August 24, 2026

New Mexico has no statute that names a carbon monoxide alarm, and looking for one is what makes the state seem empty. Two adopted codes carry the requirement instead, and they divide the buildings between them. For houses, the Construction Industries Division adopted the 2021 International Residential Code under 14.7.3 NMAC, the 2021 New Mexico Residential Building Code, reaching detached one-family dwellings, two-family dwellings and townhouses within CID jurisdiction. For everything else, including hotels and motels, the State Fire Marshal's own rule at 10.25.5 NMAC adopts the 2021 International Fire Code as the state's minimum requirements and excludes only those same houses, and only while they are not being used commercially.

In practical enforcement, local plan-review materials reference IRC Section R315 for trigger conditions and placement in covered residential projects. This means obligations are most explicit for homes in new construction and permit-triggered work rather than as one broad statewide landlord and hotel statute.

New Mexico operators should document adopted-code scope, trigger analysis, installation locations, and inspection outcomes in each property file before occupancy turnover. Logging permit-date code transitions also helps prevent scope disputes during enforcement review.

Quick Safety Summary

CO detector requirements for New Mexico
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. The State Fire Marshal rule is the instrument and it amends nothing in Chapter 9, which was checked rather than assumed. 10.25.5 NMAC, amended 1 November 2022, establishes the state minimum requirements at 10.25.5.2(A) and fixes the operative code at 10.25.5.7(E) as the currently adopted International Fire Code, 2021 edition. Across the whole part, "915" and "carbon monoxide" each occur zero times against 73 occurrences of "10.25.5", so Section 915.1.1 applies as published and reaches classrooms in Group E occupancies where a condition in Sections 915.1.2 through 915.1.6 exists. The only carve-out from the rule, at 10.25.5.2(B), is detached one- and two-family dwellings and townhouses of not more than three storeys built to the New Mexico Residential Building Code, so a school is inside the rule twice over. Where the signal has to go is the part of Section 915 a classroom answer usually leaves out. 915.2.3 requires detector signals to be "automatically transmitted to an on-site location that is staffed by school personnel", excepting a Group E occupancy whose occupant load is 30 or less. A New Mexico school above that load is therefore buying a monitored path to a staffed office, not alarms on classroom walls. Note where the rule is filed, because it is why national summaries reach the wrong instrument: it sits under public safety and rests on a statute in the Insurance Code, while the Construction Industries Division adoption of the 2021 International Residential Code at 14.7.3 NMAC is a dwelling instrument that cannot classify a school at all.

Workplaces: New Mexico 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. Section 915.1.1 of the 2021 International Fire Code, fixed as the operative code by 10.25.5.7(E) and unamended anywhere in the part, reaches Group I-1, I-2, I-4 and R occupancies and classrooms in Group E occupancies, with no Group B, F, M or S. The check is on the record: "915" and "carbon monoxide" each occur zero times across the whole of 10.25.5 NMAC against 73 occurrences of "10.25.5". New Mexico writes no carbon monoxide statute, and 14.7.3 NMAC, the Construction Industries Division adoption of the 2021 International Residential Code, governs dwellings.

When Are CO Alarms Required?

Buildings with fuel-burning appliances
Buildings with attached garages
New construction
When building permits are required
14.7.3 NMAC adopts the 2021 IRC framework for covered residential construction under CID jurisdiction.
Permit transition language in 14.7.3 NMAC sets when projects must follow the adopted code edition.

Where to Install CO Alarms

Local plan-review guidance tied to NMRBC Section R315 places alarms outside each sleeping area.
Local guidance also allows ceiling or wall mounting in accordance with code and manufacturer instructions.

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

Device Requirements

Combination smoke and carbon monoxide units are referenced with UL 2034 and UL 217 listing expectations in local plan-review guidance.
Interconnection and power pathways follow the adopted residential code section references used by local authorities.

Landlord and Tenant Responsibilities

The cited statewide sources do not provide one complete landlord-tenant duty split for all New Mexico rental categories.
Reading only the Construction Industries Division adoption produces the wrong answer for lodging, and it is worth saying why because the mistake is easy to make twice. Under NMSA 60-13-9(F) the division adopted the 2021 International Residential Code through 14.7.3 NMAC, and a residential code governs dwellings rather than the hotel occupancies that belong to the building and fire codes. That is a limit on the residential adoption, not a gap in New Mexico law. The State Fire Marshal's rule at 10.25.5 NMAC is the instrument that reaches a hotel, and it sits under Public Safety and Law Enforcement rather than under construction licensing, which is why a search of the building code family misses it.

Full New Mexico landlord and tenant carbon monoxide duties, with citations

Enforcement

Enforced by: New Mexico Construction Industries Division for covered residential work, with local authorities enforcing adopted requirements in their jurisdictions.

Enforcement typically occurs:

During permitting and inspection workflow for projects governed by 14.7.3 NMAC.
During local plan review and final inspection where NMRBC Section R315 requirements are applied.

What a Tenant Can Do in New Mexico

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

"Via general law" means the New Mexico 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 New Mexico, with the citation or the body of law searched for each.
Rent withholding	Via general lawNMSA 47-8-27.2. Abatement rather than escrow or counterclaim. The resident gives written notice of the conditions needing repair, and if the owner does not remedy them within seven days the resident may abate one-third of the pro-rata daily rent for each day from the notice through the day the condition is remedied, rising to the whole daily rent where the breach leaves the dwelling uninhabitable. That rate was read on 2026-08-23 and is what tells a resident whether the lever is worth pulling. The money stays with the resident rather than going to a court or a receiver, which puts New Mexico with Vermont among the few states here where withholding means what a reader assumes it means. Subsidised housing is capped separately, the section referring to an abatement limitation of one month's rent.
Repair and deduct	No provision foundSearched: NMSA 47-8-27.1 and 47-8-27.2, the resident remedy sections of the Uniform Owner-Resident Relations Act, read for any provision letting a resident have work done and charge it against rent. The act does not carry one. 47-8-27.2 gives abatement, which reduces what is owed rather than reimbursing what was spent, so a resident who pays a contractor recovers nothing under it. This is the Montana pattern: a URLTA adoption occupying the model's remedial ground and replacing the operative verb, and reading the section number rather than the verb would give the wrong answer.
Right to end the lease	Via general lawNMSA 47-8-27.1. Unusually fast for a URLTA state. The written notice specifies the breach and sets termination at not less than seven days after receipt if it is not remedied, where Kentucky, Kansas and Nebraska all take thirty. Damages and injunctive relief sit alongside it, subject to the same one-remedy-per-rental-period rule.
Notice the tenant must give	Via general lawNMSA 47-8-27.1; NMSA 47-8-27.2. No waiting period before serving, and the two routes want different things said. The termination notice specifies the acts and omissions constituting the breach; the abatement notice specifies the conditions needing repair. A resident who writes only the second cannot terminate on it.
Landlord cure period	Via general law, 7 daysNMSA 47-8-27.1. Seven days, shared with Florida, Hawaii, Iowa, Oregon and Texas and shorter than the fourteen most of the fifty-one run, though Idaho, Utah and Wyoming run three. The same seven runs under 47-8-27.2 before abatement begins. It is untiered, so a dead carbon monoxide alarm and a failing latch mature together, but the shortness of the period is itself the compensation.

Applies to every row above:New Mexico's Uniform Owner-Resident Relations Act is a URLTA adoption that renamed the parties, calling them owner and resident rather than landlord and tenant, and it substituted a remedy where the model act puts repair-and-deduct. What a New Mexico resident gets instead is abatement: 47-8-27.2 lets rent be reduced rather than spent and recovered. No New Mexico statute puts a carbon monoxide duty on an owner as such, so every column comes from the act. One rule governs the whole row and has no counterpart elsewhere in this matrix: the remedies are mutually exclusive within a rental period, so a resident who abates cannot also terminate for the same breach in the same month and has to pick.

Remedies last checked 2026-08-03. Compare New Mexico with the other states.

What New Mexico Requires in Lodging

The New Mexico carbon monoxide requirement reaches hotels and short-term rentals.

Hotels already standing: covered too. The New Mexico requirement reaches an existing hotel and not only one being built.

Operator duty: A New Mexico hotel or motel operator answers to the State Fire Marshal's rule rather than to the residential code. 10.25.5 NMAC, Public Safety and Law Enforcement, Chapter 25 State Fire Marshal, Part 5 Fire Prevention and Public Occupancy, issued by the Department of Homeland Security and Emergency Management and amended 1 November 2022, says at 10.25.5.2(A) that it "establishes the state's minimum requirements" for structures and premises against the hazard of fire and explosion and against conditions hazardous to life, property or public welfare in their occupancy. 10.25.5.7(E) fixes the code as the currently adopted International Fire Code, 2021 edition. The only carve-out, at 10.25.5.2(B), is detached one- and two-family dwellings and townhouses of not more than three stories built to the New Mexico Residential Building Code, and even that is withdrawn "for those being used as commercial properties", so a hotel is inside the rule on both counts. IFC 915.1.1 then requires detection in Group I-1, I-2, I-4 and R occupancies where the conditions in 915.1.2 through 915.1.6 exist, and IBC 310.2 places transient hotels and motels in Group R-1. The rule amends nothing in Chapter 9: across the whole part, "915" and "carbon monoxide" each occur zero times against 73 occurrences of "10.25.5", so the model text applies as published. Enforcement runs through the fire marshal with authority over permitting and inspections in the political subdivision, with the State Fire Marshal as final authority on how the code applies.

Full New Mexico hotel and short-term rental requirements

Penalties for Non-Compliance

A violation is a misdemeanor carrying a fine of not more than $500, and each day the violation continues is a separate offense, so the daily accrual matters more than the ceiling. Violating a final cease and desist order costs a further $500 for each day it continues, enforceable by the attorney general in a civil suit brought on the relation of the state fire marshal.

NMSA 59A-52-24 and 59A-52-25, reached through 10.25.5.9(K) and (L) of the State Fire Marshal's rule, which disapply the International Fire Code's own penalties at Sections 109.4 and 111.4 and substitute these. New Mexico files its State Fire Marshal in Chapter 59A, the Insurance Code, which is why a search of the public safety or construction titles finds no penalty.

Additional Notes

No standalone statewide carbon monoxide alarm statute identified as of 2026. The requirements come from two adopted codes: 14.7.3 NMAC under NMSA 60-13-9 for houses, and 10.25.5 NMAC under the State Fire Marshal for the occupancies the residential code does not reach, hotels among them.
New Mexico residential compliance should cite 14.7.3 NMAC plus local implementation guidance where available.
Rentals were open here for the wrong reason, and the reason is worth naming because it is easy to repeat. The question this row answers is whether the requirement reaches a rented dwelling, not whether New Mexico splits the duty between a landlord and a tenant. It does not split it, and that leaves the row untouched. 14.7.3.8 NMAC adopts the 2021 International Residential Code by reference, and 14.7.3.2 NMAC scopes the rule to "all construction, alteration, relocation, enlargement, replacement, repair, equipment, use and occupancy, location, removal and demolition of all detached one- and two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories high with separate means of egress". That is a list of building types and building work, with no clause about who holds the keys, so a rented house is inside it. Neither the words "carbon monoxide" nor "R315" appears anywhere in 14.7.3 NMAC, so the model section applies as the 2021 edition prints it.

Local Rules That Differ From State Law

At least one New Mexico municipality sets CO requirements that go beyond the statewide rule. Where your property sits decides which applies, and the stricter one governs.

Santa Fe

Santa Fe is the only jurisdiction in this dataset that asks a carbon monoxide alarm to detect carbon monoxide at a low concentration and to show the reading. Its Residential Green Building Code, adopted as Exhibit A to Chapter VII under Subsection 7-4.2 and applied by 7-4.2(B)(1) to new single-family, attached and detached dwellings, carries a pollutant source control part, and Section 11.901.12 is its carbon monoxide measure. The alarm goes in a central location outside each separate sleeping area in the immediate vicinity of the bedrooms, sited to NFPA 720, hard-wired with battery back-up wherever existing electrical lines are accessible, and certified by a third party to CSA 6.19 or UL 2034. Then the sentence that has no counterpart anywhere else: at least one of the alarms must be capable of detecting carbon monoxide concentrations as low as 9 parts per million and must include a visible display. That matters because a standard alarm is not built to tell anyone about 9 ppm. UL 2034 is a life-safety standard aimed at concentrations that will hurt somebody quickly, and a conventional device stays silent through long exposure at levels well below its alarm thresholds. A low-level monitor with a display turns an alarm into an instrument, and Santa Fe requires one in every new house it covers. Section 11.901.12 carries a mandatory exception rather than a permission, excusing the alarms only where all three of no attached garage, no gas-fired appliances within the conditioned space, and a third stated condition are true, which reads as a requirement with a narrow escape rather than an optional credit; the code also runs an incentives layer at 7-4.2, so confirm with the city which measures it treats as mandatory before relying on the point. A companion code for additions and remodels sits at 7-4.3. Short lets are handled separately and in the ordinary way. Section 14-6.2 makes a short-term rental permit or registration conditional on a fire evacuation plan, carbon monoxide detection, smoke alarms in all bedrooms, fire extinguishers on each floor, no combustible materials stored in mechanical, boiler or electrical rooms, address numerals at least four inches tall, and a non-combustible ash receptacle kept outside the dwelling unit for any fireplace or wood stove. The city inspects before the first permit issues and may inspect again on notice. The ash receptacle is a source-side control of the kind only Shreveport otherwise attempts.

Santa Fe City Code Exhibit A to Chapter VII, Residential Green Building Code Section 11.901.12, adopted under Subsection 7-4.2, with short-term rental standards at Section 14-6.2 Checked 2026-08-11.

What was checked:New Mexico's state rule is a floor by its own terms, 10.25.5.2(A) framing the adopted fire code as the state's minimum requirements, and permitting and inspection are carried out locally in the larger municipalities. One city has used that room for something no other jurisdiction in this survey has attempted, and it is worth reading the entry below for the number rather than the structure. Seven municipalities read on 2026-08-11: Santa Fe, Albuquerque, Las Cruces, Farmington, Angel Fire, Cloudcroft and Ruidoso Downs. Six carry nothing on carbon monoxide detection. Albuquerque deserves naming because it looks like the opposite on a raw count: eleven hits, on an index answering 459 times for "building" and 306 for "fire", and every one of the eleven belongs to the vehicle emissions inspection programme, the air quality monitoring thresholds or the false alarm fee schedule. Las Cruces's two are false alarm definitions. Not one is a duty to fit a detector. Taos Ski Valley could not be read at all and must not be counted clean: its publisher record answers zero for every control, the seventh time this survey has met that shape. Taos town, Red River and Silver City were not searched.

Local sweep last reviewed 2026-08-11.

Official Sources & References

New Mexico Statutes Annotated Section 60-13-9 (Construction Industries Division Duties) , NMSA 60-13-9(F) directing CID to adopt building codes (state code, accessed 2026-02-18)
No standalone statewide CO alarm statute identified as of 2026. NMSA 60-13-9(F) directs the Construction Industries Division to adopt building codes. CO alarm requirements enter New Mexico law through 14.7.3 NMAC (adopting the 2021 IRC with Section R315) under this statutory authority.
New Mexico Administrative Code 14.7.3 PDF , 14.7.3.2 scope, 14.7.3.5 effective date, 14.7.3.8 adoption of 2021 IRC (building code, accessed 2026-02-17)
Core statewide residential-code adoption source under CID jurisdiction.
New Mexico Administrative Code 14.7.3 HTML , 14.7.3 NMAC (building code, accessed 2026-02-17)
Full administrative code entry confirming adoption framework and amendments context.
City of Albuquerque Building Safety ADU checklist , References to NMRBC Section R315 location interconnect and power notes (agency guidance, accessed 2026-02-17)
Local plan-review guidance that operationalizes New Mexico residential alarm placement and device expectations.
10.25.5 NMAC, State Fire Marshal, Fire Prevention and Public Occupancy , 10.25.5.2 (scope), 10.25.5.7(E) (adopted edition), 10.25.5.7(D) and (J) (authority) (fire code, accessed 2026-08-24)
The instrument that answers the lodging question, and the one a building-code search never reaches because it sits under Public Safety and Law Enforcement. Re-read independently on 2026-08-24 and every figure below reproduced: the 2021 International Fire Code, effective 1 November 2022, with the filing note recording that it replaced a version effective 26 November 2019, and no amendment to Section 915, Section 915.2.3 or Section 1103.9 and no mention of carbon monoxide anywhere in the part. So the edition is current at four years and the zeros are two independent readings rather than one. Refetched on 2026-08-07 at 15,575 bytes, 29,846 normalised characters, control "10.25.5" at 73. Scope at 10.25.5.2(A) is the state's minimum requirements for structures and premises; 10.25.5.2(B) excludes only detached one- and two-family dwellings and townhouses built to the residential code, and not those used as commercial properties. 10.25.5.7(E) fixes the International Fire Code at the 2021 edition. Across the whole part "915" occurs zero times and "carbon monoxide" zero times, so Chapter 9 is adopted unamended. The Construction Industries Division cross-reference at 10.25.5.7(I) was chased separately: six candidate parts of NMAC title 14 were pulled and none contains "915".
New Mexico CID rules laws and building codes page , CID code administration resources (agency guidance, accessed 2026-02-17)
State agency reference for current residential-code administration workflow.
14.7.3.2 and 14.7.3.8 NMAC, 2021 New Mexico Residential Building Code, scope and adoption of the 2021 International Residential Code (state code, accessed 2026-08-22)

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

Does New Mexico require carbon monoxide alarms in homes?

Yes, for new and permit-triggered residential work. 14.7.3 NMAC adopts the 2021 International Residential Code for one-family and two-family dwellings and townhouses under Construction Industries Division jurisdiction, and Section R315 of that code carries the carbon monoxide requirement. What the adoption does not do is reach backwards: an existing dwelling that nobody is working on is outside it. The question to ask about your own house is not whether New Mexico has a rule but whether your project crosses the code trigger.

When does building work in New Mexico trigger an alarm requirement?

In New Mexico, at new construction and at alterations, repairs or additions that need a permit. Those are the two doors in Section R315.2, and the second is the one people miss, because a permit pulled for something unrelated to heating can still bring the alarm requirement with it. There is no retroactive trigger: nothing in the residential adoption requires an untouched existing dwelling to add an alarm, and no sale or transfer provision does it either. The Construction Industries Division enforces the adopted code where it has jurisdiction and a local authority enforces it where it does not, so the office that answers the trigger question is the one issuing your permit.

Where do carbon monoxide alarms go in a New Mexico home?

Outside each separate sleeping area in a New Mexico dwelling, in the immediate vicinity of the bedrooms, under Section R315.3 of the adopted code, and inside a bedroom that itself contains a fuel-burning appliance or has an attached bathroom containing one. Mounting height is set by the manufacturer rather than by the code, so the manual that came with the unit governs the last few inches. One alarm serving a hallway of bedrooms satisfies the sleeping-area rule for all of them. What it does not satisfy is the in-bedroom trigger, which is counted per room rather than per floor.

Who is responsible for a carbon monoxide alarm in a New Mexico rental?

New Mexico writes no single carbon monoxide duty split for rentals. What it has instead is the Uniform Owner-Resident Relations Act, which calls the parties owner and resident rather than landlord and tenant, and which puts a general duty on the owner to keep the premises fit. A dead alarm reaches that duty through the general obligation rather than through a provision naming the device, so the remedy a resident holds is the one in the section below rather than a carbon monoxide section.

Is an all-electric home in New Mexico exempt?

Not by being all-electric. New Mexico applies Section R315 as adopted, and it asks two questions of which only one is about fuel: whether the dwelling contains a fuel-fired appliance, and whether it has an attached garage with an opening that communicates with the dwelling. A house with no gas at all and a garage door into the kitchen is inside the requirement on the second condition. This is the one place where a records note is the answer rather than a sign-off: get the exemption decision and its code basis in writing from the authority that made it, because it is the document that has to survive a later inspection.

Can a New Mexico resident withhold rent and end the lease over the same problem?

No, and this is a rule with no counterpart in any other state record here. New Mexico's remedies are mutually exclusive within a rental period: a resident who abates rent under Section 47-8-27.2 cannot also terminate for the same breach in the same month, and has to choose. That matters because the two routes suit different situations, abatement for a problem being fixed slowly and termination for one that will not be fixed. Picking the wrong one costs the other for that period. The cure period is seven days, which is unusually short for a state that adopted the uniform act; Kentucky, Kansas and Nebraska allow thirty.

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