What access control does
Access control decides who can enter, where and when. At its simplest it is a key in a lock. At its most developed it is a set of readers, electric locks and software that grants or denies entry per person and per door, and keeps a record. The main access control options differ in how a person proves they are allowed in, and in how easily that permission can be changed.
The main options
Mechanical keys
Keys are cheap, familiar and need no power. Their weaknesses are copying and loss: you cannot tell who used a key, and a lost one may mean rekeying the lock. Keyed locks suit most homes and very small workplaces, especially when paired with sound key control habits.
Keypads and codes
A keypad lock lets people in with a code. You can usually add and delete codes without changing hardware, which is handy for family members, cleaners or staff turnover. The drawbacks are shared codes, codes that are easy to guess, and wear patterns on keys that can hint at digits. Careful keypad entry practice means unique codes per person where the device allows, and changing them when someone leaves.
Cards and key fobs
Cards and fobs are carried credentials read by a reader at the door. They are common in offices and shared buildings. Individual credentials can be disabled when lost, and many systems log each use. Cards can be lent or duplicated, depending on the technology, so ask about the credential type and how it resists copying. A lost card is a manageable problem if someone is responsible for deactivating it promptly.
Smart locks
Smart locks combine a lock with electronics, often accepting codes, a phone, or a physical key, and allowing remote management. They suit people who want temporary access for guests or contractors. They also add batteries, software and possible network exposure to a door, so the trade-offs of smart locks deserve a careful look. Keep a mechanical backup, use strong unique passwords and two-factor authentication where offered, and keep the software updated.
Biometric readers
Fingerprint and similar readers tie entry to a body characteristic, so there is nothing to lose or lend. They also raise privacy and data-handling questions, and failure rates vary. Before choosing one, read about biometric authentication, ask how templates are stored, and check local rules on collecting biometric data, which differ by place.
Intercoms and video entry
For visitors, an intercom or video panel lets someone inside see and speak to the caller before opening a door remotely. This is a way to control who comes in rather than a credential for residents, and it works well alongside the options above, especially in shared buildings with buzzer systems.
Matching an option to a site
A home. Most households need reliable locks first. A keypad or smart lock can be added to avoid hiding spare keys under a mat, and codes make it easier to give a dog walker temporary access. Fobs or cards are rarely necessary unless the building supplies them.
A small business. A mixture often works: keyed or keypad entry for the front, credentials for staff areas, and a separate arrangement for storerooms or cash handling areas. Individual credentials are better than a shared code when you need to know who opened a door and to remove access when someone leaves.
A larger workplace. Cards, fobs or mobile credentials managed in software are usual, with permissions by door, group and time of day. Here, the choice of management software and the process for adding and removing people matter as much as the readers.
Questions to ask
- What happens when a credential is lost, and how quickly can it be disabled?
- Does the system keep a log of entries, and who can see it?
- What happens to the door in a power outage or if the network is down? Doors on escape routes must stay safely exitable, and building and fire codes apply, so check with the local authority.
- How are batteries monitored and replaced?
- Can the system grow, and does it work with your alarm panel?
- Are there ongoing fees for software or credentials?
Common mistakes
Choosing electronics for a weak door is a frequent one. A high-tech lock set in a flimsy frame or paired with a poor strike plate is only as strong as the frame, so look at door deadbolts and reinforcement as well. Another is never reviewing who still has access. Occupant changes, such as a new tenant or an employee who has left, should trigger a review of codes and credentials.
Privacy and records
Entry logs record people’s movements. Employees and residents are entitled to expect that records are used reasonably, so tell staff what is logged and check local rules on retention and notice. No access control method makes a building impossible to enter; each simply controls the routine route in and gives you a better record of who used it.