Commercial Access Control: Which Type Is Right for Your Building?

Every commercial building runs on access decisions. Who can open the front door, who can get into the server room, who can be in the building at 2 a.m. Most businesses make those decisions informally for years, and it works right up until the day it doesn’t.

The way you make those decisions has a name. It’s called an access control model, and there are three common ones in commercial buildings. Knowing which one you’re using, and which one you’ve outgrown, is the fastest way to figure out what your building actually needs.

Not sure which model your building is running?

Discretionary Access Control (DAC)

In a discretionary system, whoever holds access can pass it along at their own discretion. An owner gives the assistant manager a key. The assistant manager has a copy made for the weekend supervisor. Nobody logs any of it.

This is the model almost every small business starts with, and for good reason. It requires no system, no administrator, and no training. If you have eight employees and one location, it’s genuinely adequate.

The weakness is built into the definition. Access spreads sideways without anyone tracking it, so the person who authorized it originally loses visibility fast. A key to a private office can be duplicated at a hardware store for a few dollars, and no record exists that it happened.

Mandatory Access Control (MAC)

Mandatory access control is the most restrictive of the three. Access is enforced centrally against defined security levels, and individual managers cannot grant exceptions, even to people who report to them.

Think of a records room in a healthcare facility or a lab handling controlled materials. The rule is set at the top: this classification of space is open to this clearance level only. A supervisor who wants to walk a vendor through cannot simply decide to do so. The system won’t allow it and there is no informal workaround.

That rigidity is the point. MAC exists where the cost of a wrong access decision is regulatory exposure or physical danger, and where “the manager said it was fine” is not an acceptable answer during an audit. It’s rare outside of government, healthcare, research, and defense work, and it is deliberately inconvenient.

Role-Based Access Control (RBAC)

Role-based access is the most widely used model in commercial buildings, and it’s the one most businesses should be moving toward.

Access is attached to a job, not to a person. Everyone with the title of shift lead can open the stockroom. Everyone in maintenance can open the mechanical rooms. When someone is hired, they inherit the access their role carries. When someone leaves or changes jobs, their access changes with the role, in one step.

That last part is where the real value sits. In a discretionary system, removing access means finding every key, fob, and code that person accumulated over three years, and hoping the list is complete. In a role-based system, it’s a single change.

What about attribute-based access?

You’ll increasingly hear about attribute-based access control (ABAC), which layers conditions on top of roles. Not just “maintenance can open the mechanical room,” but “maintenance can open the mechanical room on weekdays between 6 a.m. and 6 p.m.” Most modern electronic locks support some version of this through scheduling, and it’s worth asking about when you’re comparing hardware.

The three models side by side

How to tell which one your building needs

The honest answer usually comes down to size, shifts, and sensitivity. A few practical thresholds:

Stay discretionary if you have fewer than about 20 employees, one location, one shift, and no spaces where a wrong entry would be a serious problem. Adding administrative overhead you don’t need is its own kind of cost.

Move to role-based when any of these become true: you’ve added a second shift, you’ve opened a second location, turnover has picked up, or you’ve reached the point where you can no longer name everyone who can open a given door. That last one is the clearest signal.

Layer in mandatory controls when you’re storing regulated data or materials on site, when you’re subject to audits that ask who accessed a space and when, or when a wrong entry creates a safety risk rather than an inconvenience.

Most commercial buildings end up mixed. Role-based on the interior, something closer to mandatory on two or three specific rooms, and a simple mechanical lock on the storage shed out back that nobody needs to track.

How commercial keyless locks fit in

The model you choose determines the hardware that makes sense, and the mapping is fairly clean.

You don’t have to solve the whole building at once. Most of our customers start with the two or three doors where a wrong entry would actually hurt, and expand from there.

We help facility managers, property owners, and integrators match the right model and the right hardware to each door, and we install nationwide. Or browse the commercial lineup to see what fits your building.