Prevent tailgating in access control by looking beyond who has permission to unlock a door and considering who actually passes through it. For many commercial buildings, unauthorized entry does not involve a stolen credential, damaged lock, or sophisticated security breach. It can happen when someone follows an authorized employee through a secured entrance before the door closes.
A business may have electronic access control, assigned credentials, scheduled access permissions, and a record of every authorized card presentation, yet still have difficulty determining whether an additional person entered without authorization. This creates a security concern for office buildings, healthcare facilities, warehouses, manufacturing operations, and other properties where controlling access is essential to protecting people, information, and assets.
Reducing unauthorized entry requires more than reminding employees to close doors. Businesses should understand how tailgating occurs, identify entrances where the risk is greatest, and consider appropriate combinations of access control, physical entrance design, video surveillance, and employee procedures. Facility Protection Group helps commercial organizations evaluate these vulnerabilities and develop security measures suited to their buildings and daily operations.
Table of Contents
- Understanding Tailgating and Unauthorized Entry
- Why Access Control Alone May Not Prevent Tailgating
- Which Commercial Entrances Face the Greatest Risk?
- How to Prevent Tailgating in Access Control Environments
- Using Video Surveillance to Improve Entry Awareness
- Building Employee Awareness Without Disrupting Operations
- Choosing the Right Tailgating Prevention Measures
- When Should Your Business Review Its Entry Security?
Understanding Tailgating and Unauthorized Entry
Tailgating occurs when an unauthorized person follows an authorized individual through a controlled entrance without independently presenting valid credentials. The situation may involve someone deliberately taking advantage of an open door, but it can also result from everyday workplace habits. An employee may hold a door for a visitor, delivery driver, contractor, or unfamiliar individual without realizing that the person has not been authorized to enter.
The related term piggybacking is often used to describe entry in which an authorized person knowingly permits another individual to follow them through a secured opening. In practice, the terms are sometimes used interchangeably. The important security distinction is that the access control system may record one valid credential even though two or more people entered.
For commercial facilities, this creates a gap between granting access and verifying actual entry. A credential transaction establishes that a particular card, mobile credential, or PIN was accepted by the system. It does not automatically establish the identity or number of people who crossed the doorway.
The consequences depend on the facility. In an office, unauthorized entry may expose employee workspaces or confidential information. In a warehouse, it may provide access to inventory or shipping areas. At a healthcare property, it may compromise restricted spaces or interfere with established visitor procedures. These risks make tailgating an operational security issue rather than simply a matter of employee courtesy.
Why Access Control Alone May Not Prevent Tailgating
Electronic access control systems provide important capabilities for managing commercial entrances. Administrators can assign permissions, establish schedules, disable lost credentials, and review recorded access events. These functions improve accountability and reduce dependence on traditional mechanical keys. However, most conventional access-controlled doors are designed to determine whether a valid credential may release the locking hardware, not to count every individual passing through the opening.
Consider an employee entering through a secured side door. The employee presents an authorized credential, the electric lock releases, and the door opens. A second person walks through immediately behind the employee. The system may record the authorized credential and the door opening, but without additional detection technology or monitoring, it may not identify the second person as a separate entry event.
Door-position switches, request-to-exit devices, and forced-door or held-open alerts can provide useful information about door conditions. They do not, by themselves, reliably establish how many people entered during an authorized opening. Similarly, a door that closes and relocks correctly may still have allowed an unauthorized individual to pass through.
FPG’s Commercial Access Control Guide explains the broader role of electronic access management in commercial security. Tailgating prevention builds on those fundamentals by addressing the physical movement of people through controlled entrances.
The goal is not to replace conventional access control but to recognize its limitations and determine where additional safeguards are justified. A low-traffic administrative office may need a different approach from a busy employee entrance, a distribution facility, or a restricted production area. Effective planning begins with understanding how each doorway is used and what could happen if an unauthorized person gained entry.
Which Commercial Entrances Face the Greatest Risk?
Not every entrance presents the same opportunity for unauthorized access. The greatest exposure often occurs where frequent pedestrian traffic, delivery activity, or competing operational demands make it difficult to verify each person’s authorization. A facility may have strong access control at its main entrance while employee side doors, loading areas, and connecting corridors receive less attention.
Employee entrances are particularly important because people tend to develop familiar routines. During shift changes or busy arrival periods, several employees may approach a controlled doorway together. Someone without authorization can take advantage of that movement, especially when employees assume that anyone wearing a uniform, carrying equipment, or appearing familiar belongs inside the building.
Loading docks, contractor entrances, and service corridors present different challenges. Deliveries must move efficiently, contractors may need temporary access, and employees may be focused on completing operational tasks rather than monitoring who enters. Restricted areas within a facility, including IT rooms, inventory storage, and production spaces, also deserve attention because unauthorized movement beyond an initial entrance may create additional exposure.
A useful security assessment considers pedestrian traffic, visibility, door-closing behavior, visitor procedures, and the consequences of unauthorized entry. Businesses should prioritize entrances according to their actual risks rather than assuming every doorway requires identical equipment.
How to Prevent Tailgating in Access Control Environments
To prevent tailgating in access control environments, businesses need to match their entry procedures and physical safeguards to the way people use each opening. Conventional card readers, mobile credentials, and PIN-based systems remain important for verifying authorization, but additional measures may be appropriate where an unauthorized person could follow someone through a released door.
Improve Door Operation and Entry Visibility
A properly functioning door closer, appropriate locking hardware, and correctly configured access-control timing help limit unnecessary periods when an entrance remains unsecured. Door-held-open notifications may alert designated personnel when an opening remains open longer than expected. These measures can improve door management, although they do not independently detect every tailgating event.
Entrance visibility is equally important. Appropriate lighting, unobstructed sightlines, and a clear view of approaching visitors can make it easier for employees or security personnel to recognize unusual activity. At entrances with reception or staffed security, the physical layout should support consistent visitor identification without creating unnecessary congestion.
Consider Controlled Entry Solutions for Higher-Risk Areas
Some facilities may benefit from optical turnstiles, controlled pedestrian gates, security portals, or other entrance-management technologies. Depending on their design, these solutions can regulate pedestrian movement, provide alarms, or use sensors to identify possible multiple-person passage. Their effectiveness varies by equipment, configuration, traffic conditions, and the facility’s operating procedures.
These solutions are not appropriate for every doorway. Businesses must account for accessibility, visitor movement, emergency egress, fire and building code requirements, and the practical needs of employees. A security measure that restricts entry must not create an unsafe condition for people leaving the building during an emergency.
The U.S. Access Board’s accessibility guidance provides useful information about accessible routes and building elements. Any proposed entrance modification should also be reviewed against the applicable locally adopted building and life-safety codes.
Using Video Surveillance to Improve Entry Awareness
Video surveillance can provide valuable context when an access-control event does not fully explain who entered a building. A camera positioned to capture an entrance may show whether another person followed an authorized employee through a doorway. When video and access-control records are integrated appropriately, security personnel may be able to review a credential transaction alongside footage from the corresponding entrance.
However, an ordinary security camera does not automatically prevent tailgating or identify every unauthorized person. Its effectiveness depends on camera placement, image quality, lighting, recording availability, and whether personnel actively monitor or review relevant footage. Video analytics may provide additional detection capabilities on supported systems, but those capabilities require careful evaluation and should not be treated as infallible.
FPG’s Commercial Video Surveillance Guide discusses how camera coverage, recording architecture, and system planning contribute to effective commercial security. For tailgating concerns, the objective is to capture useful activity at the entrance rather than simply installing a camera nearby.
Businesses should also establish appropriate video access, retention, and privacy practices. Footage is most useful when authorized personnel can locate and review it promptly after a reported incident or unusual access event.
Building Employee Awareness Without Disrupting Operations
Technology works best when employees understand their responsibilities at controlled entrances. Staff should know when to direct visitors toward reception, how to handle unfamiliar individuals, and whom to contact when someone attempts to enter without authorization. Procedures should be practical enough to follow during busy work periods rather than relying on employees to confront potentially dangerous individuals.
Training should emphasize courteous verification and safe reporting. Employees should not be expected to physically block or challenge someone who may pose a threat. Instead, organizations can establish clear reporting procedures, provide accessible communication methods, and make visitor identification part of normal operations.
Contractor management also matters. Temporary credentials, defined access schedules, and consistent escort requirements can reduce confusion about who belongs in restricted areas. When employees understand how authorized visitors are supposed to enter, unusual activity becomes easier to recognize.
For businesses experiencing repeated unauthorized-entry concerns, Facility Protection Group can evaluate access-control operations, entrance conditions, and available surveillance capabilities to identify practical improvements. A coordinated review can help determine whether the most useful next step involves equipment changes, revised procedures, or a combination of both.
Choosing the Right Tailgating Prevention Measures
Choosing an effective solution begins with understanding the building rather than selecting equipment first. A business with a staffed reception area may be able to improve entry control through visitor procedures, better sightlines, and appropriate access permissions. A distribution center with multiple employee entrances may require additional door monitoring, surveillance coverage, or controlled pedestrian entry equipment. The appropriate response depends on the consequences of unauthorized access and the way each entrance operates.
Facility managers should consider how many people use an entrance, whether visitors and contractors share the same doorway, and how easily employees can recognize someone who does not belong. They should also examine whether the existing access control system provides useful door-status information and whether surveillance footage can support an investigation when an unusual event occurs.
Integration can make these systems more useful together. For example, an access-control event associated with a particular entrance may help security personnel locate corresponding video footage. Where supported, specialized detection technologies may provide alerts when multiple people pass through an entrance during a single authorized opening. However, an access event or alarm should not automatically be interpreted as proof of unauthorized entry without appropriate verification.
FPG’s Integrated Security Systems Guide explains how coordinated access control, video surveillance, and other security technologies can improve awareness and response. For facilities concerned about tailgating, integration should support a clearly defined operational objective rather than add complexity without measurable value.
Balance Security, Accessibility, and Emergency Egress
Any modification to a controlled entrance must account for safe building use. Restrictive entrance equipment, changes to door hardware, or revised locking arrangements may affect accessible travel, emergency evacuation, and fire protection requirements. Businesses should evaluate these considerations before installation, particularly at doors serving as required means of egress.
The Occupational Safety and Health Administration’s exit-route requirements emphasize the importance of keeping exit routes maintained and usable. Depending on the occupancy and jurisdiction, additional building, fire, accessibility, and life-safety provisions may apply. A qualified security professional should coordinate proposed changes with the appropriate design professionals and authorities where required.
The objective is to reduce unauthorized entry without making ordinary building access unnecessarily difficult or interfering with safe evacuation. Well-designed security measures support both protection and normal operations.
When Should Your Business Review Its Entry Security?
Businesses do not need to wait for a confirmed intrusion before examining their entrance security. Repeated reports of unfamiliar individuals entering behind employees, doors frequently being held open, missing visitor records, or unexplained activity in restricted areas can all justify a closer review. Facility changes, increased contractor traffic, new tenants, or expanding operations may also alter the way existing entrances are used.
A practical review should begin with the entrances that present the greatest exposure. Security personnel can examine access permissions, door operation, traffic patterns, employee procedures, and available video coverage to determine whether existing safeguards match the building’s current needs. The review may reveal opportunities to improve procedures without major equipment changes, while higher-risk areas may justify additional technology or entrance modifications.
It is also important to recognize that preventing unauthorized entry is an ongoing responsibility. Employee turnover, changes in visitor activity, and evolving business operations can gradually weaken procedures that once worked well. Periodic evaluation helps organizations maintain appropriate controls without relying on outdated assumptions about building traffic or security risks.
Reducing Unauthorized Entry Starts With Understanding Your Building
Electronic access control is an important foundation for commercial building security, but authorizing a credential is not the same as verifying every person who enters. Businesses that recognize this distinction are better positioned to address tailgating through appropriate entrance design, employee awareness, surveillance, and coordinated security management.
Facility Protection Group helps commercial property owners, facility managers, and security teams evaluate access-control vulnerabilities and identify practical improvements. Whether your concern involves employee entrances, restricted areas, contractor access, or recurring unauthorized-entry incidents, a professional assessment can help establish which measures are appropriate for your operation.
Concerned about unauthorized entry at your facility? Contact Facility Protection Group to discuss your building’s access-control needs and explore solutions designed around your security priorities.