NYC Boiler Inspection Requirements

Which boilers actually need an annual inspection

For low-pressure boilers, annual inspection and filing is required for H-stamped and E-stamped boilers - not HLW-stamped hot water heaters - in residential buildings with six or more families, in commercial and mixed-use buildings regardless of BTU capacity, and in any residential building classified as a Single Room Occupancy dwelling. DOB defines mixed-use here as commercial plus one to five residential units.

Two categories do not require annual inspection: boilers in residential buildings with five families or fewer, and a single boiler inside a single dwelling unit supplying heat only to that unit.

The BTU trap is worth stating plainly. A low-pressure boiler with a heating input of 100,000 BTUs or less is still subject to inspection whenever it sits anywhere outside a single apartment within a six-or-more-family, commercial or mixed-use property - regardless of how many dwelling units it serves. Small does not mean exempt.

High-pressure boilers are two inspections, not one

High-pressure boilers, including electric ones, require both an internal and an external inspection. Both must fall within the same cycle but should be performed roughly six months apart, and only an authorised insurance company may perform them.

The inspector must notify DOB at least ten days before the internal inspection, filed through DOB NOW: Safety. And critically, penalties for high-pressure boilers are charged per boiler per inspection type - so a missed internal and a missed external on the same boiler are two separate penalties, not one.

Who may perform the inspection

Low-pressure boiler inspections may only be performed by qualified installers licensed by DOB, or by an authorised boiler insurance company. High-pressure inspections may only be performed by an authorised insurance company.

Hiring the inspector is the owner's responsibility in both cases. It is not something the heating contractor arranges as part of a service agreement unless they are separately qualified to do it.

Filing deadlines, and a conflict in DOB's own pages

DOB's boiler compliance page states that inspection reports are due within 14 calendar days of the inspection, and gives a worked example: an inspection performed on 31 December must reach DOB no later than 14 January of the following year.

DOB's boiler filing fees and penalties page shows a different figure in its deadline column - 45 days for the annual inspection report and 180 days for the affirmation of correction. The two pages are not consistent with each other as of 28 September 2026.

Work to the 14-day rule. It is the stricter of the two, it is stated repeatedly and with an example, and it matches the penalty structure described on the compliance page. If a deadline is going to decide real money for you, confirm it directly with the Boiler Unit rather than relying on any summary, this one included.

Late filing, and the point of no return

A report filed after the 14-day deadline but no later than 14 January of the following year is a late filing, carrying a civil penalty of $50 per month per boiler from the day after the deadline, capped at $600 per boiler.

After that window the report is treated as expired and a failure-to-file penalty of $1,000 per boiler applies. As with elevators, the filing window genuinely closes - being late stops being a fee problem and becomes a violation.

Defects: the 90 and 104 day clock again

Defects found during an inspection must be corrected within 90 days of the initial inspection date, with a subsequent inspection report filed within 14 days of the subsequent inspection.

An affirmation of correction filed more than 104 calendar days after the initial inspection date is deemed expired and rejected. That is the same 104-day limit NYC applies to elevator defects, which makes it easier to remember and no more forgiving.

A late affirmation carries a $1,000 per boiler failure-to-file penalty plus $50 per month per boiler, capped at $600.

Two 45-day extensions of the correction deadline may be requested under 1 RCNY 103-01, submitted through DOB NOW: Safety. Each request must be filed no later than the current correction deadline - miss it and the request is denied and no further extension is possible. An extension is not in effect until DOB approves it.

Filing fees and penalties

Late penalties apply to reports filed after the deadline but within twelve months of the inspection, and are paid in the Boiler portal. Full penalties apply to reports filed more than twelve months after the inspection, and are paid in the Violations portal.

The 24-hour rule nobody plans for

If an inspection reveals a dangerous condition threatening life or safety that requires the boiler to be shut down immediately, the inspector must notify DOB's Boiler Unit by email within 24 hours of discovering it.

For an owner that means a failed inspection can become an unheated building the same day, with DOB already informed. In heating season that is a habitability problem before it is a compliance problem, and it is worth knowing the possibility exists before an inspector is standing in your basement in January.

What this means when you are buying

Ask for boiler filing history by device and by inspection type, not a general assurance that the building is compliant. For a high-pressure boiler that means both the internal and the external filing for each cycle.

Establish whether any affirmation of correction is currently inside or outside its 104 days, because that distinction is the difference between a scheduled repair and an accruing penalty. And check the age and stamp type of the equipment against the exemption rules above - an owner who believed a small boiler was exempt may have years of unfiled cycles behind them.