Knox boxes are among the most consistently mismanaged Division 10 items on multifamily construction projects. They are small, they are inexpensive, and their installation seems straightforward. The problem is not the installation itself. The problem is that Knox box location must be approved by the local fire authority before installation, and most fire authorities require that the Knox box be installed and accessible before they will issue a certificate of occupancy. A Knox box installed in the wrong location, or installed without fire authority location approval, must be moved before the certificate of occupancy is issued.
On a project where the certificate of occupancy triggers a construction loan conversion or an investor equity release, a Knox box correction at occupancy has consequences that extend well past the cost of moving a small metal box.
What a Knox box is and why it is required
A Knox box is a high-security key storage device mounted on the exterior of a building or at a fire access point. It holds a building master key that the fire department can access using a universal Knox key that all fire departments in the Knox-Box Rapid Entry System carry. When fire responders arrive at a building after hours, they can open the Knox box with the universal key, retrieve the master key, and enter the building without forcing entry.
Knox boxes are required by local fire code in most jurisdictions across the western United States for commercial and multifamily residential buildings above a certain occupancy threshold. The specific threshold, the required location, and the mounting height vary by jurisdiction. What is universal: the local fire authority has authority over Knox box placement, and their approval must be obtained before the Knox box is installed in the approved location.
How fire authority approval works
The fire authority approval process for Knox box location varies by jurisdiction, but the general approach is consistent. The applicant, either the owner or their designated representative, submits a request to the local fire prevention bureau or fire marshal’s office identifying the proposed Knox box location on the building. The fire authority reviews the proposed location against their standards for accessibility to responding fire apparatus, visibility from the street, and clearance from other building features.
The review may happen through the building permit process, through a separate Knox box permit process, or through the pre-occupancy inspection process depending on the jurisdiction. In Denver, the Knox box location is typically reviewed during the fire suppression system plan review. In Seattle, Knox box location approval goes through Seattle Fire Department’s fire permit process. In Portland, it goes through Portland Fire and Rescue. In Salt Lake City, through Salt Lake City Fire Department. In Albuquerque, through Albuquerque Fire and Rescue. In El Paso, through El Paso Fire Department.
The Division 10 sub should identify the applicable fire authority for the project’s specific jurisdiction, confirm the approval process, and initiate the approval process at pre-construction, not at the time of installation.
What happens when Knox box location is not pre-approved
A Knox box installed without fire authority location approval is a fire inspection finding. In jurisdictions where fire inspection is a condition of certificate of occupancy, a Knox box finding must be resolved before the certificate is issued. Moving a Knox box requires patching the original mounting holes, repainting the affected area, and remounting in the approved location. On an exterior wall with a specific finish material, the patch repair can be visually conspicuous.
The more significant problem is timing. A Knox box location correction discovered during the final fire inspection is discovered at the worst possible moment: the GC is pushing to close out the project, the developer is pushing to start lease-up, and a minor but mandatory correction is holding the certificate. The cost of the correction is low. The cost of the delay is not.
Location requirements by jurisdiction
While the fire authority in each jurisdiction sets their own requirements, some general patterns apply across western US markets.
Mounting location. Knox boxes are typically required at the main building entry or at the primary fire access point, visible from the street or from the fire apparatus access road. In high-rise construction, Knox boxes may be required at the fire command center location rather than at the main public entry.
Mounting height. Most jurisdictions require Knox box mounting height between 5 and 6 feet above the finished grade, measured to the top of the Knox box. Some jurisdictions specify the mounting height to the centerline or the bottom of the box. Confirm the specific requirement with the local fire authority.
Multiple Knox boxes. Large multifamily developments with multiple buildings or multiple fire access points may require a Knox box at each access point. Confirm the number of required Knox boxes during the fire authority coordination process, not at the final inspection.
What to confirm from the Division 10 sub at pre-construction
The Division 10 sub should confirm the following at pre-construction for every project that requires a Knox box:
Which fire authority has jurisdiction over this project’s location. What the specific Knox box location approval process is for that jurisdiction. Whether the approval is through the building permit process, a separate Knox box permit, or the pre-occupancy inspection. When in the project timeline the approval must be initiated to complete before the projected occupancy date. What documentation the fire authority requires to initiate the approval.
This information should be confirmed before the pre-construction meeting, not surfaced as a question during it.
Knox box selection and ordering
Knox box products are available through the Knox Company and must be ordered through authorized distributors. The fire authority in most jurisdictions specifies which Knox box model is required. Knox boxes are keyed to the jurisdiction’s universal fire key. They cannot be purchased retail and installed without the fire authority’s knowledge, because the Knox Company coordinates the keying with the fire authority that will carry the key.
Lead time for Knox box procurement is typically two to three weeks after the approved order is placed. Initiating the order after fire authority location approval is obtained is standard practice. Confirm that the Division 10 sub’s process includes Knox box procurement after approval, not before.
How Innergy handles Knox box coordination
On every project where Innergy covers Division 10 scope, we identify the applicable fire authority at pre-construction, confirm the Knox box location approval process for that jurisdiction, and initiate the approval process on the project timeline. We order the Knox box after location approval and install in the approved location before the pre-occupancy fire inspection. For Division 10 as a standalone or as part of a full seven-division package in TX, WA, OR, CO, UT, or NM, contact us and we respond within one business day.