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Department of Buildings

In observance of the Emancipation Day holiday, DOB will be closed on Tuesday, April 16, 2024; no construction will be allowed on this day without an after-hours permit. You may report illegal construction by submitting an Illegal Construction Inspection Request Form during normal business hours or by calling 311.

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Carbon Monoxide & Smoke Alarm Requirements

The District of Columbia law/code requires the installation and maintenance of smoke alarms and carbon monoxide alarms in buildings with residential occupancies in the District of Columbia. Both property owners and tenants have responsibilities to ensure that all District residents remain safe in their homes from the dangers of fire and carbon monoxide poisoning.

The District of Columbia Property Maintenance Code (2017), referred to as the “Property Maintenance Code,” requires the installation of carbon monoxide alarms in all new and existing residential and institutional dwelling units with a carbon monoxide source, including but not limited to apartments, condos, one and two-family houses and townhouses, dormitories and residential institutions.

To view the Updated Property Maintenance Code, click here.

DOB Enforcement:

DOB enforces the requirements pertaining to the installation and maintenance of smoke detectors and carbon monoxide detectors through the issuance of a “Notice of Infraction” to property owners who fail to comply with the code. 

Carbon Monoxide Alarms:

In any existing building with dwelling units, that has either fossil fuel, burning equipment or an attached enclosed garage, a carbon monoxide detector must be installed in the immediate vicinity outside of each sleeping area or grouping of bedrooms in the dwelling unit with very limited exceptions.

Smoke Alarms:

All existing residential buildings that contain sleeping units or dwelling units must have a smoke alarm installed in every room used for sleeping purposes, on the wall or ceiling of each separate sleeping area in the immediate vicinity of bedrooms, and one on each story within a dwelling unit including basements and habitable attics. In split levels, not divided by a door, the upper level alarm serves as the lower level alarm.

In new buildings, all the alarms have to be hardwired with battery backup (subject to certain exceptions), and if more than one smoke alarm is required to be installed within a dwelling unit, they have to be interconnected so that if one goes off they all go off. Existing buildings are allowed to use battery powered smoke alarms without physical interconnection, but are required to provide hardwired interconnected smoke alarms in compliance with the requirements applicable to new buildings where work is being done that results in the removal of interior walls or ceiling finishes exposing the structure, or where there is an attic, crawl space or basement available that could provide access for hardwiring without removal of interior finishes.

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