Section 153:10-a Automatic Fire Warning Devices and Carbon Monoxide Detection Devices in Dwellings, New Hampshire Revised Statutes Annotated, New Hampshire General Court was read on September 23, 2026, and every quote on this page came off that page on that day. Fifty states were read the same way for the national comparison.

New Hampshire Carbon Monoxide Detector Law and Where It Applies

Q: Does the New Hampshire requirement apply to a house that already exists?

Not on its own. The New Hampshire duty attaches to for a single family house, being built or substantially rehabilitated after January 1, 2010; for a multi-unit dwelling or rental unit the duty is continuous, which means a house that has not had that happen is not reached by the section. Ten of the fifty states wrote a duty that attaches to the dwelling itself instead.

Q: Where does New Hampshire say the alarm goes?

New Hampshire does not print a location in the section. 20 states do, which leaves the rest to the manufacturer's instructions and to whichever building code the installation is inspected under.

Yes

Required in a home

RSA 153:10-a

Only on the trigger

Reaches a home already lived in

10 of the 42 states reach one

Covered

In a rented home

one of 28 states that reach a tenancy

Not stated

Where the code says to put it

20 states print a spot

September 23, 2026

Read

off the state’s own published code

The short answer

New Hampshire requires an alarm in a rented home and in anything newly built.

New Hampshire requires carbon monoxide detection in every multi-unit dwelling and rental unit as a standing duty and in a single family house built or substantially rehabilitated after January 1, 2010, but only where the dwelling has an attached garage or an appliance that burns solid, liquid or gas fuel.

In New Hampshire the duty runs continuously in a rented home and otherwise waits for construction. The trigger the code names is for a single family house, being built or substantially rehabilitated after January 1, 2010; for a multi-unit dwelling or rental unit the duty is continuous.

Rented and newRented homesRSA 153:10-aread September 23, 2026

The section itself

RSA 153:10-a, and what it attaches to

The sentence below is the whole of it. Everything that separates New Hampshire from the state across the river sits inside that sentence and inside the clause that conditions it, which is why it is reproduced rather than summarised.

A requirement and the event it waits for are two different facts, and a roundup that carries the first without the second is how the same state gets described as strict and as lax in the same week. Both are on the card, with the citation, the title the code gives the section and the link the sentence was read from.

The section

Automatic Fire Warning Devices and Carbon Monoxide Detection Devices in Dwellings

RSA 153:10-a

Every single family dwelling which is built or substantially rehabilitated after January 1, 2010, shall be equipped with an automatic fire warning device and a carbon monoxide detection device; provided that a carbon monoxide detection device shall not be required if the single family dwelling does not have an attached garage and does not contain an appliance or device that uses a combustion method of burning solid, liquid, or gas fuel.

Section 153:10-a Automatic Fire Warning Devices and Carbon Monoxide Detection Devices in Dwellings, New Hampshire Revised Statutes Annotated, New Hampshire General Court, read September 23, 2026. Read it at the source

ReachRented homes, and anything newly built
Triggerfor a single family house, being built or substantially rehabilitated after January 1, 2010; for a multi-unit dwelling or rental unit the duty is continuous
Effectivesingle family provision applies to dwellings built or substantially rehabilitated after January 1, 2010; section last amended 2011, 129:1, eff. July 1, 2011
SourceSection 153:10-a Automatic Fire Warning Devices and Carbon Monoxide Detection Devices in Dwellings, New Hampshire Revised Statutes Annotated, New Hampshire General Court

Two duties in one code: a landlord carries one all the time, and an owner occupier meets the other only by building.

Where the code says to put it

New Hampshire prints no location of its own

New Hampshire prints no spot of its own, which leaves placement to the manufacturer's instructions and to whichever building code applies.

Nationally 20 of the fifty print a location and the rest, this state among them, leave it to the manufacturer's instructions and to whichever code the building is inspected under. Where a state wrote nothing, nothing is supplied in its place.

In a rented home

What New Hampshire puts on a landlord and what it puts on a tenant

New Hampshire puts the job on the owner. Every rental unit and multi-unit dwelling is covered as a standing duty, and the owner keeps the device in suitable condition.

The split matters because the two halves are enforced differently: an installation duty runs against the owner and a maintenance duty commonly runs against whoever is living there. Where the section names no party, the card says so rather than filling the silence with the commonest answer. 28 states of the fifty reach a tenancy at all.

In a rented home

Installsowner
Maintainsowner

every rental unit and multi-unit dwelling is covered as a standing duty, and the owner keeps the device in suitable condition.

Each multi-unit dwelling and rental unit shall be equipped with automatic fire warning devices in accordance with the NFPA 101 Life Safety Code and the NFPA 72 National Fire Alarm and Signaling Code and carbon monoxide detection devices in accordance with the NFPA 720 Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment ... The owner of the rental unit shall be responsible for maintaining the automatic fire warning device and carbon monoxide detection device in a suitable condition.

New Hampshire, read September 23, 2026. Read it at the source

What counts as an alarm

New Hampshire names the standard the alarm has to meet

New Hampshire names NFPA 720 Standard for the Installation of Carbon Monoxide (CO) Detection and Warning Equipment.

38 states of the fifty name a standard and 16 say in writing that a combination smoke and carbon monoxide alarm satisfies the requirement. Where a state named none, approval belongs to the code the building is inspected under, which is a local reading rather than a state one.

What the code provides

New Hampshire writes the consequence into the section

New Hampshire writes the consequence into the code: citation under RSA 153:24: a violation if a natural person, a misdemeanor if any other person; the enforcement authority first serves a written notice of violation with a time limit to fix it.

It is quoted on the card above in the sentence it was read from. What a penalty clause says and what an enforcement body does with it are different questions, and only the first is on this page. Nationally 19 states print something inside the section; the rest send a reader to a general enforcement provision.

How New Hampshire compares

The same question in the other forty nine

42 states require a carbon monoxide alarm in a home and 8 have no statewide section for one. Of the 42, 10 reach a home already lived in, 25 wait for a sale, a permit or a first build, and 28 reach a rented home.

The bar splits the fifty by what their section touches, and the table beneath it puts them in alphabetical order for finding a particular one. Neither order tracks how cold a state gets.

10Every home

4Rented and new

11Permit or new build

8Sale or transfer

6New build only

3Rented only

8None statewide

All fifty states, alphabetical. Reach is what the section speaks to: the dwelling itself, or an event happening to it.
State	Reach	Rented homes	Placement rule	Citation
Alabama	Permit or new build	No	No	Ala. Admin. Code r. 305-2-4-.09 (Residential Building Codes), adopted by the Alabama Energy and Residential Codes Board under Code of Ala. 1975, Sections 41-23-80 through 41-23-85
Alaska	Every home	Yes	Yes	Alaska Stat. 18.70.095(a)
Arizona	None statewide	No	No	No section
Arkansas	Permit or new build	No	No	12 CAR pt. 15, Arkansas Fire Prevention Code, 2021 Edition, Volume III
California	Every home	Yes	Yes	Cal. Health & Safety Code 17926(a)
Colorado	Sale or transfer	Yes	Yes	C.R.S. 38-45-102
Connecticut	New build only	No	No	Conn. Gen. Stat. §29-292
Delaware	Rented only	Yes	No	16 Del. C. 6602C
Florida	New build only	Yes	Yes	Fla. Stat. 553.885
Georgia	New build only	No	No	Georgia State Amendments to the International Residential Code (2024 Edition), Section R311 Carbon Monoxide Alarms, revising Section R311.2.1, adopted by the Department of Community Affairs under the Uniform Codes Act, O.C.G.A. Section 8-2-20 et seq.
Hawaii	Permit or new build	No	No	Haw. Rev. Stat. 107-25, with the code adopted under it
Idaho	New build only	No	No	Idaho Code 39-4116(2)(b), with the code itself defined at 39-4109(1)(b)
Illinois	Every home	Yes	Yes	430 ILCS 135/10
Indiana	Permit or new build	No	No	675 IAC 14-4.4-27 (2020 Indiana Residential Code, amending Section R315.2.2 of the 2018 International Residential Code)
Iowa	Every home	Yes	No	Iowa Code 10A.518(3)(b)
Kansas	None statewide	No	No	No section
Kentucky	New build only	No	No	815 KAR 7:125, promulgated under KRS 198B.040(7) and 198B.050
Louisiana	Sale or transfer	Yes	No	La. R.S. 40:1581
Maine	Sale or transfer	Yes	Yes	25 M.R.S. §2468
Maryland	Rented and new	Yes	Yes	Md. Code, Public Safety § 12-1104
Massachusetts	Every home	Yes	No	M.G.L. c. 148, §26F1/2
Michigan	Permit or new build	Yes	Yes	MCL 125.1504f (Stille-DeRossett-Hale Single State Construction Code Act, 1972 PA 230, Sec. 4f; the "Overbeck law")
Minnesota	Every home	Yes	Yes	Minn. Stat. 299F.51, subd. 1 (a)
Mississippi	None statewide	No	No	Senate Bill 2378, 2014 Regular Session, Section 1
Missouri	None statewide	No	No	No section
Montana	Rented only	Yes	No	Mont. Code Ann. 70-24-303(1)(g)
Nebraska	Sale or transfer	Yes	Yes	Neb. Rev. Stat. 76-604
Nevada	None statewide	No	No	No section
New Hampshire	Rented and new	Yes	No	RSA 153:10-a
New Jersey	Sale or transfer	Yes	No	N.J.S.A. 52:27D-133.3
New Mexico	Permit or new build	No	No	14.7.3 NMAC, 2021 New Mexico Residential Building Code
New York	Every home	Yes	No	N.Y. Exec. Law 378(5-a)
North Carolina	Rented and new	Yes	Yes	N.C. Gen. Stat. § 42-42(a)(7)
North Dakota	None statewide	No	No	N.D. Admin. Code 45-18-01-04
Ohio	Every home	Yes	Yes	Ohio Adm.Code 1301:7-7-11 (Ohio Fire Code, Chapter 11), modifying International Fire Code Sections 1101.1 and 1103.9
Oklahoma	Permit or new build	No	No	OAC 748:20-6-1
Oregon	Sale or transfer	Yes	Yes	Or. Rev. Stat. 105.838
Pennsylvania	Rented only	Yes	Yes	Carbon Monoxide Alarm Standards Act, Act of Dec. 18, 2013, P.L. 1229, No. 121, section 4
Rhode Island	Sale or transfer	Yes	Yes	Rhode Island Life Safety Code, 450-RICR-00-00-8, §24.6.3.1 (adopted under R.I. Gen. Laws §23-28.1-2)
South Carolina	Permit or new build	No	No	S.C. Code Regs. R.8-1200 (2021 International Residential Code as adopted), promulgated under S.C. Code Ann. Section 6-9-40 and Section 6-9-50
South Dakota	None statewide	No	No	No section
Tennessee	Permit or new build	No	No	Tenn. Comp. R. & Regs. 0780-02-23-.02 (Adoption by Reference), Division of Fire Prevention, under T.C.A. Section 68-120-101(a), (b), and (d)
Texas	Permit or new build	No	No	Tex. Loc. Gov't Code 214.212
Utah	Permit or new build	No	No	Utah Code 15A-2-103(1)(b)
Vermont	Sale or transfer	Yes	Yes	9 V.S.A. §2882
Virginia	New build only	Yes	Yes	13VAC5-63-240 (Virginia Construction Code, Section 915 as amended), adopted under Va. Code § 36-99
Washington	Every home	Yes	Yes	Wash. Rev. Code 19.27.530
West Virginia	Rented and new	Yes	Yes	W. Va. Code § 15A-10-12
Wisconsin	Every home	Yes	Yes	Wis. Stat. 101.647 (3) (a)
Wyoming	None statewide	No	No	No section

A row of tall nineteenth century brick and frame houses on Queen City Avenue in the South Fairmount neighbourhood of Cincinnati, under a clear sky. — Housing this old is the whole question. Ohio is one of ten states whose carbon monoxide section attaches to the dwelling itself, so it reaches these houses as they stand. In most of the country the same section would wait for one of them to be sold, altered under permit or rebuilt. “Queen City Avenue, South Fairmount, Cincinnati, OH (28224745388)”, Warren LeMay, CC0

New Hampshire carbon monoxide alarm questions

Does New Hampshire require a carbon monoxide detector?

Does the New Hampshire requirement apply to a house that already exists?

Where does New Hampshire say the alarm goes?

Who is responsible in a rented home in New Hampshire?

What is the penalty in New Hampshire?

Citation under RSA 153:24: a violation if a natural person, a misdemeanor if any other person; the enforcement authority first serves a written notice of violation with a time limit to fix it. The code puts it this way: "Whoever shall violate any rule or regulation of the state fire marshal issued pursuant to RSA 153:5 or RSA 153:14, I, shall be guilty of a violation if a natural person, or guilty of a misdemeanor if any other person. Each offense shall constitute a separate violation."

What kind of alarm does New Hampshire accept?

When was this read?

Carbon monoxide detector laws in every state

Home heating rebatesWhat a state pays toward replacing the fuel burning appliance the alarm is watching, and where the application actually lives.Sidewalk snow removal rulesWho has to clear the walk and by when, read off thirteen statutes and a great many city codes.Leaving a car running unattendedThe winter law that turns out to sit in a theft statute rather than an emissions one.Ground snow load by stateWhat a roof is designed to carry, and the fourteen states that publish their own number.

New Hampshire read September 23, 2026, off the state’s own published code: RSA 153:10-a, as part of a reading of all fifty compiled September 23, 2026. Every quotation above is reproduced in the source’s own wording and links back to the document it was read from. Legislatures amend these between sessions, and a county or city building code can reach a building the state code does not, so the link beside a quote is what governs on the day. What New Hampshire wrote is what this page carries: the duty, what it attaches to, where the code puts the alarm, what it says about a rented home, and the sentence it set.