Fire Alarm Verification vs Annual Inspection and Testing in Ontario (S537 vs S536)

Side by side

Two documents, two regimes, two different sets of rules about who may sign them and how long they live. If you take one thing from this page, take the code column.

Read this before you quote the Building Code

Ontario's Building Code is O. Reg. 163/24, in force 1 January 2025. It is one page long. It adopts NBC 2020 as amended by the "Ontario Amendments to the National Building Code of Canada 2020," and the amendment document actually in force is dated 17 July 2026. MMAH does not publish that document online — it is sent on email request only, from Ontario.Amendment.Document@ontario.ca.

The free text you can open right now is the 2024 Building Code Compendium Vol. 1, the "January 16, 2025 Update," which sits four amendment-document versions behind the one in force. The Building Code quotation below is from it and is marked as such. O. Reg. 332/12, the old full-length Building Code, was revoked 1 January 2025.

That caveat applies to the Building Code only. The Fire Code, O. Reg. 213/07, is on e-Laws in full, consolidated to 1 January 2026 with an e-Laws currency date of 12 August 2026, last amended by O. Reg. 303/25. Everything quoted from the Fire Code below you can read yourself for free.

Verification is a Building Code requirement

Building Code Article 3.2.4.5, verbatim from the Compendium, printed page 100:

(1) Fire alarm systems, including those with voice communication capability where provided, shall be installed in conformance with CAN/ULC-S524, "Standard for Installation of Fire Alarm Systems."

(2) Fire alarm systems shall be verified in conformance with CAN/ULC-S537, "Verification of Fire Alarm Systems," to ensure satisfactory operation.

That is where the duty to verify lives. Installation to S524, verification to S537, both in the same article, both attached to the act of building.

Which makes sense once you see what the two codes are for. The Building Code governs construction. The Fire Code governs buildings in use. A verification is the closing act of the construction side.

The Fire Code invokes S537 exactly once — and it is about hotels

There is a persistent belief in the trade that the Fire Code requires verification. It does not, other than in one narrow place.

The only article in the Fire Code that invokes CAN/ULC-S537 is 9.9.4.12.(2) — Part 9, Retrofit, Section 9.9, Hotels. Verbatim:

Where a fire alarm system has been installed, extended or modified as required by this Section, the system or portion of the system shall be tested in conformance with CAN/ULC-S537, "Standard for Verification of Fire Alarm Systems".

Sentence (1) of the same article requires the installation, extension or modification itself to conform to CAN/ULC-S524. Sentence (3) reads:

Sentences (1) and (2) do not apply to existing fire alarm system components.

Read the scope carefully. It is triggered by work "required by this Section" — the hotel retrofit section. It is not a general obligation. Outside Part 9 Section 9.9, the Fire Code does not require anyone to verify anything.

So if you are being told a verification is owed on a job, the question to ask is which code the work falls under. New construction and permitted work: Building Code. A system already in service, no permit: the Fire Code duty on it is inspection and testing under S536, not verification. More on what the verification itself covers in what a CAN/ULC-S537 verification actually involves.

Annual inspection and testing is Fire Code 6.3.2.2

First, the section title, because it trips people up when they search the regulation. Section 6.3 is not called "Fire Alarm Systems." It is called "ALARM AND VOICE COMMUNICATION SYSTEMS FOR LIFE SAFETY."

Article 6.3.2.2, verbatim:

(1) Except as provided in Sentence (2), a fire alarm system, with or without voice communication capability, shall be inspected and tested in conformance with CAN/ULC-S536, "Standard for Inspection and Testing of Fire Alarm Systems".

(2) Despite Clause 14.4.1.6. of CAN/ULC-S536, a UL listed smoke detector sensitivity instrument may be used to conduct annual sensitivity testing of smoke detectors.

(3) A description of the fire alarm system as required in CAN/ULC-S536 shall be kept current and maintained in the building at an approved location.

(4) A record of each device, component and circuit of the fire alarm system that is inspected and tested in accordance with Sentence (1) shall (a) indicate whether the device, component or circuit is in proper working order, and (b) be kept in accordance with Subsection 1.1.2.

(5) Where a fire alarm system is monitored to transmit a signal to the fire department, the owner shall record whether all signals from the tests conducted in Sentence (1), or other events, are received by the monitoring station, and records shall be kept in accordance with Subsection 1.1.2.

Three obligations sit in there beyond the testing itself, and they are the ones that get missed on site: a current system description kept in the building at an approved location, a per-device record stating whether each item is in proper working order, and, on a monitored system, a record of whether the monitoring station actually received the signals. Sentence (5) is a record of receipt, not a record of transmission.

Where "annual" actually comes from

Here is a precision point worth having straight, because it is a good way to tell who has read the regulation and who is repeating a summary.

Article 6.3.2.2 states no frequency. Read it again above. There is no interval anywhere in it. It delegates the whole question of how often to CAN/ULC-S536.

The word "annual" enters the Fire Code elsewhere:

• Article 6.3.2.1, which refers to "the annual tests or annual inspections required by this Subsection"
• Division C, Article 1.2.1.1, the qualification article, which applies to a person who "performs annual tests or annual inspections of a fire alarm system required under Article 6.3.2.2. of Division B"

So the Fire Code plainly assumes there is an annual test and an annual inspection, and it regulates who may do them — but the interval itself is set by the standard, not by the Code article that requires the work. Writing "Article 6.3.2.2 requires annual testing" is a shortcut that misstates the text. The accurate version: 6.3.2.2 requires inspection and testing in conformance with S536, and S536 is where the frequencies live.

Note also Sentence (2)'s carve-out is a permission, not a duty: it lets you use a UL listed sensitivity instrument despite Clause 14.4.1.6 of the standard. It is one of the few places Ontario reaches inside S536 and changes something.

Repairs and alterations follow a third standard

Worth flagging because it is a common third bucket that is neither a verification nor an annual inspection.

Fire Code Article 6.3.1.8, verbatim:

Repair, replacement and alterations of fire alarm system components shall be in accordance with CAN/ULC-S524, "Standard for the Installation of Fire Alarm Systems".

So changing a device on an in-service system is S524 work under the Fire Code. Whether it also triggers an S537 verification is a Building Code and permit question, and the scope rules for verifying a modification live inside S537 itself. See S524, S537, S536 and S1001: what each standard covers.

Which editions Ontario names

Both codes reference standards by a fixed edition, not "the latest."

The Fire Code table also names S531-2019, S552-14, S553-14, S561-13 and S1001-11.

Fire Code rule 1.2.1.1.(1), verbatim:

A reference in this Code to a document set out in Table 1.2.1.A. is to the edition designated in the table.

Rule 1.2.1.3 lets the Chief Fire Official permit an earlier edition where compliance with the referenced edition is impractical.

The two codes agree on S524 and S537 — both land on 2019. That is worth saying out loud, because they have not always lined up, and a mismatch between the Building Code edition and the Fire Code edition is exactly the kind of thing that turns into an argument on site.

What is published is a different matter. The current published editions are CAN/ULC-536-2024 (6th edition, last revised 5 August 2024 — note the "S" was dropped from the designation) and CAN/ULC-S537-2019-REV1 (6th edition, last revised 5 April 2021, "S" retained). Neither of those is what Ontario names. Buying the newest edition off the shelf does not mean you are holding the edition the regulation points at. This is covered in more depth in which edition of the standard actually applies.

Who is allowed to do each — the sharpest difference

This is where the two duties come apart hardest, and almost nobody states it correctly.

Fire Code Division C, Article 1.2.1.1, verbatim:

(1) This Subsection applies to every person who (a) performs annual tests or annual inspections of a fire alarm system required under Article 6.3.2.2. of Division B, (b) performs the testing and maintenance of fire alarm system components that interconnect with other fire protection and life safety systems required under Article 6.10.1.1. of Division B, and (c) repairs, replaces or alters components of a fire alarm system.

Article 1.2.1.2.(1), verbatim, sets what that person must have. They:

(a) must have successfully completed a program or course acceptable to the Fire Marshal, (b) shall, at the request of the owner or the Chief Fire Official, produce for inspection a copy of a certificate or document attesting to the successful completion of a program or course referred to in Clause (a)

Article 1.2.1.2.(2), verbatim, is the supervision allowance — and note it applies only to Clause (1)(c) work, the repairs and alterations:

Despite Sentence (1), a person who has not successfully completed the required program or course may perform the work described in Clause (1)(c) provided that (a) the work is done under the supervision of a person who has successfully completed a program or course required by Clause (1)(a), (b) no more than two persons work under the supervision of the person referred to in Clause (a) at the same time, and (c) the supervision is provided at the work site.

Sentence (3) adds that the supervisor "shall advise the owner in writing that the work has been completed."

Now count what is on that list in 1.2.1.1. Annual tests and inspections. Interconnection testing under 6.10.1.1. Repairs, replacements and alterations. That is the whole list.

S537 verification is not on it. The hotel-retrofit verification under 9.9.4.12.(2) is not named in Division C 1.2.1.1, and neither is verification generally.

So the position in Ontario, stated plainly: the regulation sets a qualification requirement for annual inspection and testing, for interconnection testing, and for repairs and alterations — and names no qualification at all for performing a verification. Who is acceptable to perform a verification is an authority-having-jurisdiction determination, and in practice it is also driven by the specification, the insurer and the standard itself. It is not driven by a rule in O. Reg. 213/07, because there isn't one.

And note what the regulation says, not what people say it says. The requirement is "a program or course acceptable to the Fire Marshal." CFAA is not named anywhere in the regulation. Which programs are accepted is administrative, and it can change without any amendment to a regulation. "CFAA registration is legally required" is not a statement the regulation supports. Full treatment in who can legally install, verify and test fire alarm systems in Ontario.

Records: two years versus the life of the system

The most useful practical difference on this page, and the one that costs money when it is missed.

Fire Code Article 1.1.2.2, verbatim:

(1) Subject to Sentence (2), the original or a copy of any record required by this Code shall be retained at the building to which the record relates (a) for a period of at least two years after being prepared, and (b) so that at least the most recent and the immediately preceding record of a given test or inspection are retained.

(2) The initial verification or test reports for fire protection systems installed after November 21, 2007 shall be retained throughout the life of the systems, regardless of whether the systems are installed in accordance with this Code or the Building Code.

Read Sentence (2) closely. It catches initial verification reports regardless of which code the system was installed under — the Fire Code is reaching out and imposing a retention duty on a document produced under the Building Code.

So:

• Annual inspection report — two years, and at least the last two of them, kept at the building.
• Initial verification report — for the life of the system. Forever, in practice.

That is why "we can't find the verification report" is a real problem on a building from 2010 and a shrug on last year's annual. The original verification is the only record of how the system was proven when it was new, and Ontario expects it to still be in the building decades later.

The boundary case: integrated testing

Where a building has integrated fire protection and life safety systems, a third regime sits alongside these two.

Fire Code Article 6.10.1.1, verbatim in relevant part:

(1) This Section applies to the testing and maintenance of integrated fire protection and life safety systems that are (a) installed on or after January 1, 2020, and (b) required by the Building Code to be verified in conformance with CAN/ULC-S1001...

(2) Interconnections between fire protection and life safety systems shall be tested and maintained in conformance with CAN/ULC-S1001...

(4) The one year integrated test required by CAN/ULC-S1001 in Sentence (2) is waived for a fire protection and life safety system installed before January 1, 2026.

Two things to get right about that date. 1 January 2026 is the date the one-year integrated test stops being waived — it is not the date S1001 first applied. And note the trigger in Sentence (1)(b): the Fire Code duty attaches to systems the Building Code required to be verified to S1001. Same pattern as fire alarm verification — the Building Code creates the verification obligation, the Fire Code creates the ongoing one.

Integration testing is also the second item on the Division C 1.2.1.1 qualification list, so unlike verification, the person doing it does fall under the Fire Marshal's program-or-course requirement.

What is not on this page, and why

You will notice this article does not tell you what is on an S537 form, what sequence the tests run in, what counts as a pass, or what has to appear in the report.

That is deliberate. All of it lives inside the standards, and the standards are paywalled. We are not going to paraphrase copyrighted content we cannot show you, and we are not going to reconstruct it from an unlicensed copy floating around a jobsite. If you need the procedures, you need CAN/ULC-S537 and CAN/ULC-S536 themselves — through your employer, a library subscription, or purchase.

What we can do, and what this page does, is tell you exactly what the law says, because the law is free and most people have never read it.

How to check all of this yourself, free

1. Ontario Fire Code, O. Reg. 213/07 on e-Laws — read 6.3.2.2, 6.3.1.8, 6.10.1.1, 1.1.2.2 and Division C 1.2.1.1 and 1.2.1.2. Search the page for "S537" and see for yourself that 9.9.4.12 is the only hit.
2. 2024 Building Code Compendium Vol. 1 — $0.00 from Publications Ontario. Article 3.2.4.5 is on printed page 100.
3. NBC 2020 from NRC — free, no registration, useful for seeing what Ontario changed.
4. The Ontario amendment document in force — dated 17 July 2026, by email from Ontario.Amendment.Document@ontario.ca. The only way to confirm current Building Code text.
5. Your AHJ — specifically on who they will accept to perform a verification, since the regulation names nobody.

Last updated: August 2026. Fire Code quotations are from O. Reg. 213/07 on e-Laws, consolidation period 1 January 2026, e-Laws currency date 12 August 2026, last amendment O. Reg. 303/25. The Building Code quotation is from the 2024 Building Code Compendium Vol. 1, the January 16, 2025 Update; the amendment document in force is dated 17 July 2026 and is not published online.

General information, not compliance advice. Confirm against the code text in force for your project and with your authority having jurisdiction.