Smoke alarms
Ontario states that every home must have a working smoke alarm on every storey and outside all sleeping areas.
Ontario Smoke & Carbon Monoxide Alarm Code Guide | Kidde
Kidde Product Guide by MarsLED
Ontario Smoke & Carbon Monoxide Alarm Code Guide
A practical guide to Ontario smoke alarm and carbon monoxide alarm requirements, including the expanded CO alarm rules effective January 1, 2026, hardwired and interconnected alarm considerations, and visual signalling options for applicable projects.
Ontario 2026 CO Update
Smoke Alarm Placement
Visual Strobe Options
Kidde Model Guide
Important legal and code disclaimer — information current as of July 17, 2026
This page is provided by MarsLED solely for general educational and product-selection information. It summarizes publicly available Ontario Building Code, Ontario Fire Code and manufacturer information reviewed as of July 17, 2026. It is not legal advice, engineering advice, fire-protection design advice, electrical advice, a code interpretation, an inspection, an approval, or a representation that any product or installation complies with all requirements applicable to a particular property or project.
Building, fire, electrical and accessibility requirements may be amended, replaced, interpreted differently or supplemented by local requirements at any time. Before purchasing, specifying, replacing or installing an alarm, the customer, owner, contractor and design professional must independently verify the current requirements with the applicable municipal building department, local fire department, Electrical Safety Authority and any other authority having jurisdiction.
What Ontario homeowners should know
Ontario requires working smoke alarms in every home. Carbon monoxide alarm requirements apply to houses and residential units where specified CO risks exist, such as fuel-burning appliances, fireplaces, attached garages or certain shared heating arrangements.
Official sources:
Ontario fire safety at home
Ontario CO safety
CO alarms from January 1, 2026
In affected houses and residential units, CO alarms are required adjacent to each sleeping area and on every storey, including storeys without sleeping areas.
Installation still matters
Alarm selection alone does not establish compliance. Correct location, mounting, power supply, interconnection, maintenance and testing are also essential.
Important distinction
A smoke alarm does not detect carbon monoxide unless it is specifically identified as a
combination smoke and CO alarm. A visual strobe does not replace the required smoke or CO
sensing function; it is a notification feature used where visual signalling is required or desired.
Ontario smoke alarm requirements
For existing homes, Ontario's public fire-safety guidance says working smoke alarms must be installed on every storey and outside all sleeping areas. Owners must keep alarms operating, and landlords have additional testing and maintenance responsibilities for rental suites.
Every storey
A storey includes each floor level of the home. Basements and finished levels are not excluded simply because no one sleeps there.
Outside sleeping areas
An alarm is required outside sleeping areas so occupants can be warned while asleep. Larger layouts may require more than one alarm to cover separate sleeping areas.
Replacement and maintenance
Follow the alarm manufacturer's service-life, testing and replacement instructions. Never paint, disconnect or cover a smoke alarm.
Ontario carbon monoxide alarm requirements in 2026
Effective January 1, 2026, Ontario expanded CO alarm coverage in affected residential buildings. The new coverage adds an alarm on every storey of a house or applicable unit, including storeys without sleeping areas, while retaining the requirement adjacent to each sleeping area.
Official sources:
Ontario CO placement requirements
O. Reg. 303/25 amendment
When CO protection applies
Ontario identifies common triggers such as:
- A fuel-burning appliance
- A fireplace
- An attached storage garage
- Heating air supplied from certain fuel-burning equipment outside the unit
Where alarms are placed
- Adjacent to each sleeping area
- On every storey of the home or applicable unit
- In certain public corridors where required
Combination alarms
A listed combination smoke and CO alarm can consolidate two detection functions in one location when that location and alarm configuration satisfy the applicable requirements. It does not automatically eliminate the need for additional alarms elsewhere.
Do all Ontario homes require a CO alarm?
The expanded rules do not mean every building has the same CO risk conditions. Confirm whether
the requirements apply to your home, suite or project based on its fuel-burning equipment,
fireplace, garage and heating arrangement.
Fire Code versus Building Code
Customers often use the phrase “Ontario smoke alarm code” broadly, but two different code contexts may be involved.
Code references:
Ontario Fire Code
Ontario Building Code regulation
| Project context | Primary focus | What to verify |
|---|---|---|
| Existing occupied home or rental unit | Ontario Fire Code operation, placement, maintenance and testing requirements | Required locations, working condition, landlord/owner responsibilities and CO risk triggers |
| New construction | Ontario Building Code design and installation requirements, plus electrical requirements | Hardwiring, backup power, interconnection, room locations, visual signalling and approved plans |
| Addition or major renovation | Requirements depend on the scope of work and applicable Building Code provisions | Permit drawings, existing alarm network, compatibility and local building-official direction |
| Accessible or visual-notification application | Visual signal characteristics and where visual components are required | Candela rating, room location, interconnection, synchronization and the approved design |
Code interpretation and enforcement rest with the applicable building department, fire service, electrical authority or other authority having jurisdiction.
Visual signalling and LED strobe alarms
Ontario Building Code provisions can require a visual signalling component connected to or integrated with a smoke alarm in applicable construction. Ontario provisions have referenced a minimum luminous intensity of 175 candela for visual signalling components installed in sleeping rooms.
Code and product sources:
Ontario Building Code regulation
Kidde P4010ACLEDSCOCA
Kidde P4010ACLEDSCA
177-candela Kidde strobe
The Kidde P4010ACLEDSCA and P4010ACLEDSCOCA product families use an integrated 177-candela LED strobe designed to provide visual notification.
Smoke-only versus smoke + CO
P4010ACLEDSCA is a smoke alarm with visual notification. P4010ACLEDSCOCA-2 adds carbon monoxide detection. Select the sensing functions required for each location.
AC power limitation
The strobe function requires AC power. The sealed backup battery supports the alarm's smoke and, where applicable, CO alarm functions during a power interruption, subject to the manufacturer's instructions.
A product feature is not a blanket compliance guarantee.
A 177-candela strobe may support an applicable visual-signalling design, but the complete
installation must still satisfy the approved project requirements, including placement,
wiring, interconnection and any synchronization requirements.
Compare Kidde alarm options available from MarsLED
Use this overview to identify the functional differences before selecting an alarm. Final selection should be confirmed against the project specifications and applicable code requirements.
Manufacturer sources:
Combination smoke/CO strobe specifications
Smoke strobe specifications
Kidde P4010ACLEDSCOCA-2
Hardwired smoke and carbon monoxide alarm with voice warnings, integrated 177-candela LED strobe and sealed 10-year backup battery for the alarm functions.
View P4010ACLEDSCOCA-2
Kidde P4010ACLEDSCA
Hardwired smoke alarm with voice warning, integrated 177-candela LED strobe and sealed 10-year backup battery. This model does not independently detect CO.
View P4010ACLEDSCA
P1275CA Replacement Option
Traditional hardwired smoke alarm with replaceable battery backup and Hush feature. Verify current availability, age, compatibility and the appropriate replacement path before ordering.
View P1275CA Replacement Guide| Feature | P4010ACLEDSCOCA-2 | P4010ACLEDSCA | P1275CA |
|---|---|---|---|
| Smoke detection | Yes | Yes | Yes |
| CO detection | Yes | No | No |
| Integrated LED strobe | Yes, 177 cd | Yes, 177 cd | No |
| Hardwired AC power | Yes, 120 V AC | Yes, 120 V AC | Yes, 120 V AC |
| Backup battery | Sealed 10-year backup for alarm functions | Sealed 10-year backup for alarm function | Replaceable battery backup |
| Primary page intent | Smoke + CO + visual notification | Smoke + visual notification | Legacy model and replacement compatibility |
Browse the complete MarsLED smoke alarm collection, smoke and carbon monoxide alarms, smoke, CO and strobe alarms, or visual strobe alarm options.
Replacing a Kidde P1275CA smoke alarm
The Kidde P1275CA is an older 120 V hardwired ionization smoke alarm with a replaceable battery backup. Customers searching for this model are often replacing an installed alarm rather than planning a new alarm system. Replacement selection must consider more than the physical shape of the alarm.
Replacement references:
Kidde Canada alarm replacement guide
Kidde 20SAR-CA specifications
Suggested current replacement
Canadian fire-safety distributors commonly identify the Kidde 20SAR-CA hardwired smoke alarm as a replacement option for the discontinued P1275CA. The 20SAR-CA uses 120 V hardwired power with two replaceable AA backup batteries.
An adaptor may be required
Reusing an older P1275CA mounting location may require a compatible Kidde pigtail adaptor or other approved replacement component. Do not force a new alarm onto an old mounting plate or modify the connector to make it fit.
Verify the whole interconnected system
Before replacing one alarm in an interconnected network, confirm the new alarm's wiring connector, mounting plate, voltage, interconnect compatibility and alarm functions. Brand name alone does not establish compatibility.
Do not treat 20SAR-CA as an automatic drop-in replacement.
The correct replacement depends on the existing alarm network, connector, mounting arrangement,
required sensing technology and applicable project requirements. Confirm the replacement model
through Kidde Canada or a qualified installer before ordering.
| Replacement check | Why it matters |
|---|---|
| Manufacture and replacement date | Smoke alarms are generally replaced at the end of their listed service life, commonly 10 years. |
| Existing wiring connector | A newer alarm may require an approved adaptor rather than using the original connector directly. |
| Mounting plate and housing | Mounting patterns can change between product generations. |
| Interconnect compatibility | An incompatible alarm can cause nuisance alarms, failure to alarm or damage to interconnected devices. |
| Detection and notification functions | A smoke-only replacement does not add CO detection, voice notification or a visual strobe. |
| Current code requirements | A like-for-like replacement may not address requirements triggered by a renovation or other project scope. |
Review the current Kidde P1275CA product and compatibility information before selecting a replacement. MarsLED should identify the P1275CA page primarily as a legacy-model and replacement-information resource unless genuine, in-date inventory is confirmed.
Ontario availability and Canada-wide shipping
MarsLED supplies Kidde smoke, carbon monoxide and visual strobe alarms to homeowners, electricians, builders, property managers and contractors across Ontario, with Canada-wide shipping available.
Toronto
Mississauga
Brampton
Scarborough
Vaughan
Markham
Richmond Hill
Oakville
Burlington
Milton
Hamilton
Kitchener
Waterloo
Cambridge
Guelph
London
Barrie
Oshawa
Ottawa
Across Ontario
Frequently asked questions
What changed in Ontario's CO alarm rules on January 1, 2026?
Ontario expanded CO alarm coverage in affected houses and residential units to every
storey, including storeys without sleeping areas. CO alarms are also required adjacent
to each sleeping area where the rules apply.
Does every Ontario home need a carbon monoxide alarm?
CO alarm requirements depend on conditions such as a fuel-burning appliance, fireplace,
attached garage or specified heating arrangement. Confirm the requirements for the
particular building or unit.
Where are smoke alarms required in an Ontario home?
Ontario's public guidance says a working smoke alarm is required on every storey and
outside all sleeping areas. Additional alarms may be required by the Building Code,
approved plans or the layout of a particular project.
Does P4010ACLEDSCA detect carbon monoxide?
No. P4010ACLEDSCA is a smoke alarm with voice and visual strobe notification. Select
P4010ACLEDSCOCA-2 when independent smoke and CO detection are both required in the same device.
Does the Kidde LED strobe work during a power outage?
The integrated strobe requires AC power. The sealed backup battery supports the smoke
alarm and, on the combination model, CO alarm functions during a power interruption,
subject to the manufacturer's instructions.
Does a 177-candela strobe guarantee Ontario Building Code compliance?
No single product feature guarantees complete compliance. The alarm must be appropriate
for the occupancy and location and installed according to the approved design, applicable
code provisions, electrical requirements and manufacturer instructions.
Can I replace an older Kidde alarm with any current Kidde model?
Not automatically. Verify the existing model, mounting plate, wiring harness, interconnect
compatibility, sensor type and required replacement adaptor. Never assume compatibility
based only on the Kidde brand name.
Who should install a hardwired smoke or CO alarm?
Hardwired alarm installation must follow the manufacturer's instructions and applicable
electrical rules. Work involving fixed wiring should be completed by a person authorized
to perform the work in the jurisdiction.
Official references and product resources
The code and product statements on this page are linked to the following primary public sources. Open the source relevant to your project and confirm that it remains current.
Ontario: Fire safety at home ↗
Smoke-alarm placement, owner duties and home fire-safety guidance.
Ontario: Carbon monoxide safety ↗
CO risk conditions and placement requirements, including the January 1, 2026 change.
Ontario Fire Code ↗
Current consolidated legal text for Ontario fire-safety requirements.
O. Reg. 303/25 ↗
Amending regulation supporting expanded CO-alarm coverage.
Ontario Building Code regulation ↗
Building-code reference for applicable construction and visual-signalling provisions.
Kidde P4010ACLEDSCOCA ↗
Official combination smoke/CO, voice, 177-candela strobe and backup-battery specifications.
Kidde P4010ACLEDSCA ↗
Official smoke-only visual strobe alarm specifications.
Kidde Canada replacement guide ↗
Official guidance for locating replacements for discontinued Kidde alarms.
Kidde 20SAR-CA specifications ↗
Official specifications for the current hardwired smoke alarm with AA backup batteries.
Kidde Canada product-store details ↗
Manufacturer note that backup power supports smoke and CO alarm functions, not the AC-powered strobe.
Read full legal disclaimer and limitation of responsibility
Terms of use and limitation of responsibility
Page reviewed against the cited public sources as of July 17, 2026. MarsLED does not warrant or guarantee that this page is complete, error-free, current after that date, suitable for a particular project, or accepted by any authority having jurisdiction. Product availability, certifications, compatibility, code provisions, standards, municipal requirements and official interpretations may change without notice.
The customer and all project participants remain solely responsible for confirming the current law and code requirements, selecting an appropriate product, obtaining permits and approvals, engaging qualified professionals, and ensuring correct installation, testing, maintenance and replacement. To the maximum extent permitted by applicable law, MarsLED and its directors, officers, employees and agents disclaim liability for loss, damage, cost, claim, delay, rejection, deficiency or non-compliance arising from reliance on this page or from the selection, purchase, specification, installation or use of any product referenced on it.
Nothing on this page limits any right or remedy that cannot lawfully be excluded or limited under applicable consumer-protection or other legislation.
Need help selecting a Kidde alarm?
Share the existing alarm model, project type, required sensing functions and whether the project calls for visual notification. MarsLED can help identify product options, but final code and installation approval remains with the applicable authority and project professionals.