What Is Not a Physical Security Measure for Your Home? Examples Explained

Home security includes much more than locks, cameras and alarm sensors.

Passwords, insurance, neighborhood communication, monitoring services and everyday security habits can all help protect a household—but they do not necessarily perform the same job as a physical security measure.

That distinction is important if you are trying to understand how different layers of home security work together.

It is also particularly relevant because the exact question “What is not a physical security measure for your home?” appears in versions of Level I Antiterrorism Awareness Training.

Quick Answer

If you are looking for the answer to the Level I Antiterrorism residential-security question, the official training material identifies:

“Hiding a key outside to ensure family members can get in if they lose their keys”

as the choice that is not a physical security consideration for your home.

For homeowners asking the broader question, physical security generally refers to measures that physically protect, control access to, deter activity around, or help detect activity at the property. Examples include locks, secured doors and windows, alarms, exterior lighting and cameras. CISA includes these types of measures in its home physical-security guidance.

Measures such as cybersecurity passwords, insurance policies and some monitoring or administrative services can still be valuable—but they serve different security functions.

The key takeaway is that “not physical” does not mean “not useful.”

A strong home-security strategy normally combines several layers rather than relying entirely on one category.

What Does Physical Security Mean for a Home?

Physical security is concerned with protecting:

• People
• Property
• Buildings
• Entry points
• Physical assets

against unauthorized access, theft, damage or other unwanted activity.

At home, this generally includes measures associated with the property itself.

CISA’s home physical-security guidance recommends measures such as securing doors and windows with locks, using alarms and lighting, considering surveillance cameras, maintaining fences and other property structures, and controlling keys or entry codes.

Common examples therefore include:

• Deadbolts
• Exterior-door locks
• Window locks
• Door reinforcement
• Gates and fences
• Alarm sensors
• Security cameras
• Outdoor security lighting

These measures perform different functions, but they all interact directly with the home’s physical environment.

What Is Not a Physical Security Measure for Your Home?

The answer depends somewhat on the context in which the question is being asked.

If You Mean the Antiterrorism Training Question

The official Level I Antiterrorism training material asks:

“What is not a physical security consideration for your home?”

Among the listed choices, the training identifies hiding a key outside so family members can get inside if they lose their keys as the incorrect security practice.

That makes sense from a practical security perspective.

Hiding a working key outside can undermine the access control provided by the lock because anyone who finds the key may be able to use it.

If You Mean Physical Security as a General Home-Security Category

Several useful precautions are not themselves physical barriers or physical security hardware.

Examples may include:

• Online account passwords
• Multifactor authentication
• Homeowners or renters insurance
• Monitoring-service subscriptions
• Security education
• Emergency planning
• Some neighborhood communication systems

These measures can reduce other forms of risk or improve the response to an incident, but they do not replace the physical protection provided by doors, locks, windows and other security hardware.

Why the Exact Training Question Causes Confusion

The wording of the training question can be confusing because some of the listed answers do not sound like pieces of physical hardware either.

The official training choices include activities such as:

• Changing locks to maintain key control
• Checking whether a cleaning company is reliable and licensed
• Monitoring internet acquaintances
• Maintaining good relationships with neighbors
• Hiding a spare key outdoors

Yet the highlighted answer is the hidden-key practice.

The lesson is broader than simply categorizing objects.

The training is discussing residential physical-security considerations, including behaviors that affect control of and access to the residence.

That is why it is important not to rewrite the official quiz question into a different question and then give a different answer.

Why Hiding a Spare Key Outside Is Poor Security Practice

A lock controls access only when the key is controlled.

If you hide a spare key:

• Under a doormat
• Beneath a planter
• Inside a fake rock
• Above the door
• Near the porch

you have effectively placed an access credential outside the secured area.

The problem is not that the key itself stops being physical security.

The problem is that poor key control weakens the lock’s security function.

CISA similarly advises securing spare keys or entry codes and considering changing the locking system when keys are lost or entry codes are compromised.

What Should You Do With a Spare Key Instead?

Depending on your situation, alternatives can include:

• Giving a spare to a trusted household member
• Giving one to a trusted nearby person
• Using an appropriately secured lockbox
• Using temporary smart-lock access
• Keeping an emergency spare in another controlled location

The best option depends on:

• Who needs access
• How often they need it
• Whether you use traditional or electronic locks

House Made Clear’s guide to improving home security with better locks explains key control, rekeying and smart-lock access in more detail.

Physical vs Non-Physical Home Security

A useful way to understand the distinction is to look at what each measure actually does.

Security Measure	Physical Security?	Main Function
Deadbolt	Yes	Controls physical entry
Window lock	Yes	Secures window access
Reinforced door/frame	Yes	Strengthens entry point
Security camera	Yes, as security hardware	Detects/records activity
Motion sensor	Yes, as security hardware	Detects movement
Exterior security light	Yes	Improves visibility/deterrence
Fence/gate	Yes	Creates physical boundary
Password	No	Protects digital access
MFA	No	Strengthens digital account access
Insurance policy	No	Transfers/reimburses financial risk
Monitoring subscription	Service layer	Supports alarm response
Emergency plan	No	Guides household response
Neighborhood communication	Generally non-hardware support	Improves awareness

The categories can overlap.

Modern home security increasingly combines:

physical equipment + digital controls + monitoring services + human behavior.

Locks Are a Clear Example of Physical Security

A door lock physically controls entry through an access point.

Examples include:

• Deadbolts
• Mortise locks
• Multipoint locks
• Smart deadbolts

Even a smart lock still has a physical locking mechanism.

Its electronics simply add another method of controlling it.

If you are strengthening exterior doors, start with how to improve home security with better locks.

Door Frames Are Part of Physical Security Too

A quality lock is only one component of the entrance.

Physical door security also depends on:

• Door slab
• Frame
• Strike
• Hinges
• Fasteners
• Proper alignment

Installing an expensive deadbolt on a damaged frame does not correct the damaged frame.

That is why House Made Clear treats the complete entry assembly as a security system rather than evaluating the lock alone.

Window Locks Are Physical Security Measures

Windows are also access points.

Depending on the window design, physical security can include:

• Working factory locks
• Appropriate supplementary hardware
• Properly maintained frames

The objective is to prevent easy unauthorized opening while preserving any required emergency-egress function.

Do not permanently block designated emergency-exit windows.

Security Cameras Are Physical Devices, but Their Accounts Are Digital

This is where the classification becomes more interesting.

The Camera

A camera installed on the property is physical security hardware.

It may:

• Observe
• Detect
• Record
• Notify

activity around the home.

CISA specifically includes cameras among the measures homeowners can consider when protecting doors and windows.

The Camera Account

The account used to manage a connected camera is digital.

Protecting that account involves:

• Password
• MFA
• Software updates
• Network security

These are cybersecurity measures rather than physical barriers.

One system therefore contains both physical and digital security layers.

Security Camera Placement Still Matters

Owning a camera does not automatically provide useful coverage.

Placement determines whether the camera can actually see:

• Front entrance
• Driveway
• Side passage
• Rear door

Poor positioning can leave important areas outside the field of view.

For practical placement guidance, see how to position home security cameras without creating blind spots.

Are Security Alarms Physical Security Measures?

The physical components can be.

Examples include:

• Door sensor
• Window sensor
• Motion detector
• Alarm panel
• Siren

These are installed physical devices.

The monitoring service connected to the alarm is somewhat different.

It is a service and response layer built around the physical detection system.

That distinction is useful when thinking about what your security system actually does.

Alarm Sensor vs Monitoring Subscription

Imagine a door opens unexpectedly.

Door Sensor

Detects that the physical door changed state.

Alarm Panel

Processes the event.

Siren

Creates an audible warning.

Monitoring Service

May receive the alarm signal and follow its response procedure.

The monitoring subscription did not physically stop the door from opening.

It supports the response layer.

Both can be useful without being the same type of control.

Exterior Lighting Is a Physical Security Measure

CISA recommends external lighting around doors, parking areas and walkways and suggests positioning lights and cameras to reduce blind spots.

Exterior lighting can improve:

• Visibility
• Camera usefulness
• Safe access
• Awareness around entrances

However, lighting should not be treated as a guarantee against burglary.

It supports the broader security system.

House Made Clear covers this distinction in Should You Leave Your Porch Light On at Night?.

Motion-Sensor Lights Are Physical Security Hardware

A motion-activated exterior light combines:

• Sensor
• Fixture
• Physical placement

Its value depends heavily on where it is installed.

Useful locations may include:

• Driveway
• Side path
• Garage
• Back entrance
• Gate

For placement strategy, see House Made Clear’s guide to outdoor motion sensor light placement.

Are Passwords Physical Security Measures?

No.

Passwords are digital or logical access controls.

They help protect:

• Smart-lock account
• Security-camera account
• Wi-Fi network
• Alarm application

but they do not physically reinforce:

• Door
• Window
• Fence

CISA’s digital-home guidance recommends protecting connected devices and home networks by changing default credentials and using MFA.

These are important security measures—just not the same type as a deadbolt.

Is Multifactor Authentication a Physical Security Measure?

Generally, no.

MFA is an account-security measure.

It makes access to a digital account dependent on more than a password alone.

For example, a smart-lock application may require:

1. Password
2. Additional verification

That helps protect the digital control system.

But the deadbolt inside the door remains the physical component.

Smart Locks Combine Physical and Digital Security

Smart locks are an excellent example of why modern home security does not fit neatly into only one category.

Physical Components

• Lock body
• Deadbolt
• Cylinder
• Strike

Digital Components

• Application
• Password
• Access codes
• Cloud account
• Firmware

So asking whether a smart lock is physical or digital produces an incomplete answer.

It is a physical lock with electronic and potentially networked access controls.

House Made Clear’s smart lock vs traditional deadbolt comparison covers those tradeoffs in more detail.

Is Homeowners Insurance a Physical Security Measure?

No.

Insurance is primarily a financial risk-management tool.

Depending on the policy, insurance may help cover certain losses after an eligible event.

But an insurance policy does not physically:

• Lock door
• Stop window opening
• Detect movement
• Illuminate driveway

That does not make insurance unimportant.

It simply performs a different function.

Insurance Does Not Replace Prevention

A household may need both:

Physical Security

Helps reduce or detect unauthorized access.

Insurance

Helps manage financial consequences if a covered loss occurs.

They should not be treated as interchangeable.

Is a Neighborhood Watch a Physical Security Measure?

Generally, the communication and observation activity itself is not a physical barrier.

However, it can support:

• Awareness
• Observation
• Reporting
• Community communication

The official Level I residential-security training even includes maintaining good relationships with neighbors and watching out for one another among its security considerations.

This illustrates an important point:

Good security involves people as well as hardware.

Is Checking a Cleaning Company a Physical Security Measure?

This is another useful example from the Level I training.

The official quiz includes confirming that a cleaning company is reliable and licensed among the residential-security considerations.

In ordinary security terminology, this is better understood as:

• Personnel screening
• Vendor management
• Access control practice

rather than a physical barrier like a deadbolt.

But it directly affects who may legitimately enter your home.

If a cleaner, contractor or service provider receives:

• Key
• Garage code
• Smart-lock code

then controlling that access becomes part of the household’s overall security strategy.

Security Habits Are Not Hardware, but They Matter

Consider two identical homes.

Both have:

• Good locks
• Cameras
• Lights

Home A

Residents consistently:

• Lock doors
• Manage keys
• Remove temporary codes
• Check alerts

Home B

Residents routinely:

• Leave doors unlocked
• Hide spare keys outside
• Share one access code with everyone
• Ignore low-battery warnings

The hardware may be identical.

The effective security is not.

Physical security depends on how people use it.

What Are Administrative Security Measures?

Administrative measures are rules, routines and procedures that help people use security systems correctly.

At home, examples can include:

• Keeping track of keys
• Removing old access codes
• Checking doors before leaving
• Deciding who receives temporary access
• Creating emergency procedures

These measures do not necessarily create physical barriers, but they can determine whether those barriers work as intended.

What Are Digital Security Measures?

Digital security protects connected systems and information.

Examples include:

• Strong unique passwords
• MFA
• Secure Wi-Fi
• Firmware updates
• Account monitoring

These have become increasingly relevant because homes now contain connected:

• Locks
• Cameras
• Doorbells
• Alarm systems
• Garage-door controllers

CISA recommends changing factory-default passwords and usernames on connected devices and enabling MFA where available.

Physical Security, Cybersecurity and Personal Security

A useful way to think about home protection is as three overlapping layers.

Physical Security

Protects physical property and entry points.

Examples:

• Locks
• Doors
• Windows
• Cameras
• Lighting

Cybersecurity

Protects connected technology.

Examples:

• Passwords
• MFA
• Network security
• Updates

Personal Security

Protects household members through:

• Awareness
• Planning
• Safe routines
• Communication

A modern security plan may use all three.

Physical Security Does Not Mean Crime Prevention Is Guaranteed

No physical security measure guarantees that an incident will never happen.

Instead, different controls can:

• Deter
• Delay
• Detect
• Document
• Control access

That distinction matters when evaluating products.

Avoid thinking:

“If I buy this lock, my home cannot be broken into.”

A better question is:

“What weakness does this measure address, and what layers are still missing?”

The Layered Home-Security Approach

Instead of expecting one device to solve everything, divide security into layers.

Layer 1: Property Boundary

Examples:

• Fence
• Gate
• Landscaping
• Lighting

Layer 2: Exterior Approach

Examples:

• Motion lighting
• Cameras
• Visible entrance

Layer 3: Entry Points

Examples:

• Locks
• Doors
• Windows

Layer 4: Detection

Examples:

• Door sensors
• Window sensors
• Motion detectors

Layer 5: Digital Controls

Examples:

• Smart-lock credentials
• MFA
• Camera account security

Layer 6: Household Procedures

Examples:

• Key control
• Guest-code removal
• Locking routine
• Emergency planning

Security becomes stronger when the layers complement one another.

Why One Expensive Security Device Is Not Enough

A common mistake is concentrating the entire budget on one product.

For example:

Expensive camera + weak back-door lock

or:

Premium smart lock + shared weak password

or:

Strong deadbolt + spare key under planter

Each system contains an obvious gap.

This is why House Made Clear’s guide to common home security mistakes emphasizes reviewing the whole property rather than focusing on a single gadget.

Physical Security Measures for the Front Door

Start with the main entrance.

Check:

• Door closes correctly
• Deadbolt operates smoothly
• Strike is secure
• Frame is undamaged
• Hinges are secure
• Keys are controlled

Then consider:

• Doorbell camera
• Entry lighting
• Smart access

The technology should come after the basic physical assembly works properly.

Physical Security Measures for the Back Door

Do not give the rear entrance less attention simply because guests rarely use it.

Check:

• Lock
• Frame
• Glass
• Lighting
• Visibility

A security plan should not have a strong front entrance and a neglected secondary entrance.

Physical Security Measures for Windows

Review:

• Existing locks
• Frames
• Accessibility from outside
• Vegetation
• Nearby climbing opportunities

CISA recommends maintaining vegetation so that it does not create hiding areas or help someone gain access to the residence.

Security improvements should preserve any required emergency exit.

Physical Security Measures Around the Yard

The property surrounding the house can also affect security.

Possible measures include:

• Fences
• Gates
• Exterior lighting
• Cameras
• Maintained landscaping

CISA advises securing tools and ladders that could potentially be used to access a residence and keeping vegetation maintained so it does not provide concealment or access assistance.

Is Landscaping a Physical Security Measure?

Landscaping itself is not necessarily a security device.

But landscaping decisions can support physical security.

For example:

A large shrub directly beside an entrance may create an area that is difficult to see.

Keeping sightlines clearer can improve:

• Visibility
• Camera coverage
• Awareness

This is an example of environmental design supporting physical security.

Are Security Signs Physical Security Measures?

A sign does not physically prevent entry.

It may communicate:

• Alarm presence
• Camera presence
• Property boundary

but it does not provide the same function as:

• Lock
• Gate
• Sensor

Think of signs primarily as communication or deterrence rather than a substitute for real security hardware.

Is a Dog a Physical Security Measure?

A dog may:

• Make noise
• Alert household
• Affect how an unfamiliar person approaches

but a pet should not be treated as a replacement for appropriate:

• Locks
• Doors
• Gates
• Alarms

Animal behavior varies and should not be the foundation of a residential-security system.

Is an Emergency Plan a Physical Security Measure?

No.

An emergency plan is a preparedness measure.

It tells household members:

• What to do
• Where to go
• Who to contact

if something happens.

It does not physically prevent an incident, but it can improve the household response.

CISA’s personal-security guidance also recommends developing a family emergency action plan.

Does DIY vs Professional Installation Change the Security Category?

No.

A lock remains a physical security measure whether:

• Homeowner installs it
• Locksmith installs it

What changes is the installation process and potentially the installation quality.

The same applies to:

• Cameras
• Sensors
• Lighting

For help deciding when DIY makes sense, see House Made Clear’s guide to DIY vs professional home security installation.

Common Misunderstandings About Physical Home Security

1. “Anything Related to Security Is Physical Security”

Not necessarily.

Passwords and insurance relate to security but perform different functions.

2. “Only Barriers Count”

Too narrow.

Detection devices such as cameras and sensors can also be components of a physical-security system.

3. “Smart Devices Are Only Cybersecurity”

Incorrect.

A smart lock has physical and digital components.

4. “A Camera Physically Stops Intruders”

Usually not.

Its primary functions are monitoring, detection and recording.

5. “Insurance Makes Physical Security Unnecessary”

No.

Insurance and physical protection solve different problems.

6. “A Hidden Spare Key Is Safe Because Nobody Knows About It”

That relies entirely on the assumption that the hiding place stays unknown.

The official Level I training specifically identifies hiding a spare key outside as the answer to its residential-security quiz question.

7. “Expensive Hardware Automatically Means Strong Security”

Installation and surrounding construction matter.

8. “The Front Door Is the Only Important Entrance”

Back, side, garage-connected and patio entrances should also be reviewed.

Physical vs Non-Physical Security Examples

Example	Category	What It Does
Deadbolt	Physical	Controls door access
Reinforced frame	Physical	Strengthens entry assembly
Window lock	Physical	Controls window access
CCTV/security camera	Physical/security hardware	Observes and records
Motion light	Physical	Improves visibility
Alarm sensor	Physical/security hardware	Detects activity
Smart-lock password	Digital	Protects account access
MFA	Digital	Adds account verification
Insurance	Financial	Helps manage covered losses
Emergency plan	Administrative/preparedness	Guides response
Key inventory	Administrative	Maintains access control
Alarm monitoring	Service/response	Responds to system signals
Neighborhood communication	Community/awareness	Supports observation

How to Audit Your Own Home Security

Step 1: List Every Entrance

Include:

• Front
• Back
• Side
• Garage
• Patio

Step 2: Check Physical Barriers

Inspect:

• Locks
• Doors
• Windows
• Frames

Step 3: Review Detection

Check:

• Cameras
• Sensors
• Alarms

Step 4: Review Visibility

Inspect nighttime:

• Porch
• Driveway
• Side path
• Rear entrance

Step 5: Review Key Control

Ask:

• Who has keys?
• Are any missing?
• Are spares hidden outdoors?

Step 6: Review Digital Security

For smart devices:

• Unique passwords?
• MFA?
• Current firmware?

Step 7: Review Service Access

Who has:

• Cleaner key
• Contractor code
• Pet-sitter access?

Remove access when it is no longer needed.

Step 8: Review Preparedness

Does the household know what to do if:

• Alarm activates
• Key is lost
• Smart lock fails
• Suspicious activity occurs?

Quick Physical-Security Test

Ask this question about any security measure:

Does this directly secure, control, reinforce, detect, monitor or illuminate the physical property?

If yes, it probably belongs somewhere within physical security.

Examples:

Deadbolt → yes

Window lock → yes

Camera → yes, as physical monitoring hardware

Motion light → yes

Now ask:

Does it primarily protect an online account, transfer financial risk or guide behavior?

If yes, it probably belongs primarily to another security layer.

Examples:

Password → digital

Insurance → financial

Emergency plan → preparedness

Some measures overlap, which is completely normal.

Home Physical-Security Checklist

Check whether your home has:

• Working exterior-door locks
• Properly functioning deadbolts
• Sound door frames
• Secure exterior-door hinges
• Working window locks
• Controlled spare keys
• No unnecessary hidden keys outdoors
• Appropriate exterior lighting
• Clear entrance visibility
• Camera coverage where useful
• Proper camera placement
• Working alarm sensors where installed
• Secure patio/sliding doors
• Secure garage-to-house entrance
• Maintained gates/fences where present
• Clear landscaping around important entrances

Then check the non-physical layers:

• Smart-device passwords
• MFA
• Firmware updates
• Household security routines
• Temporary access codes
• Emergency plan
• Insurance coverage

What Should You Improve First?

Start with weaknesses that directly allow unauthorized access.

A practical order is:

Priority 1: Doors That Do Not Lock Properly

Repair these first.

Priority 2: Weak or Uncontrolled Locks

Upgrade or rekey as appropriate.

Priority 3: Windows and Secondary Entrances

Make sure every obvious access point is reviewed.

Priority 4: Visibility and Detection

Add appropriate:

• Lighting
• Cameras
• Sensors

Priority 5: Digital Controls

Secure smart-device accounts.

Priority 6: Administrative Security

Improve:

• Key management
• Guest access
• Household routines

Do not buy technology before addressing basic physical weaknesses.

Quick Answer for the Antiterrorism Training Question

Final Thoughts

Understanding what is not a physical security measure for your home is useful because home security consists of several different layers.

Physical security includes measures associated directly with protecting the property and its entry points, such as:

• Locks
• Secured doors
• Secured windows
• Alarms
• Cameras
• Exterior lighting
• Gates and fences

CISA includes these kinds of measures in its current home physical-security guidance.

Other protections perform different jobs.

For example:

Password → protects digital access

MFA → protects online accounts

Insurance → manages financial risk

Emergency plan → improves preparedness

Monitoring service → supports response

None of those are useless simply because they are not primarily physical barriers.

The strongest approach is to combine them.

And if you came here specifically for the Level I Antiterrorism question, the important distinction is that the official training material identifies hiding a spare key outside as the answer to the residential-security question.

For homeowners building a stronger physical-security foundation, continue with House Made Clear’s guides to improving home security with better locks, smart locks vs traditional deadbolts, common home security mistakes and home security camera placement.

Together, these topics cover the essential layers:

access control → physical barriers → detection → visibility → digital protection → household habits.

Frequently Asked Questions

What is not a physical security measure for your home?

In the Level I Antiterrorism residential-security quiz, the official training material identifies hiding a key outside so family members can get in if they lose their keys as the choice that is not a physical security consideration for the home.

What are examples of physical security measures for a home?

Examples include door locks, deadbolts, window locks, secured doors and frames, alarms, security cameras, exterior lighting, fences and gates.

Is hiding a spare key outside a good physical security measure?

No. Hiding a working key outside can weaken key control because anyone who finds the key may be able to use it to enter the home.

Is a password a physical security measure?

No. A password is a digital or logical access-control measure. It can protect smart locks, cameras and other connected security accounts but does not physically secure a door or window.

Is a security camera a physical security measure?

A security camera is physical security hardware used for monitoring, detection and recording. A connected camera may also have a digital-security layer involving passwords, MFA and software updates.

Is homeowners insurance a physical security measure?

No. Insurance is primarily a financial risk-management tool. It may help with eligible losses, but it does not physically secure or monitor the home.

Is an alarm system a physical security measure?

Physical alarm components such as sensors, sirens and control panels can form part of a physical-security system. A remote monitoring subscription is better viewed as a service and response layer.

Is a smart lock a physical security measure?

Yes, the lock mechanism itself is a physical security measure. However, connected smart locks also contain digital-security elements such as access codes, app passwords and account security.

Is exterior lighting a physical security measure?

Yes. Exterior security lighting is part of the physical property setup and can improve visibility around doors, walkways and other areas. It should be used as one layer rather than as a guarantee against crime.

Is multifactor authentication a physical security measure?

No. MFA is a digital account-security measure. It can improve protection for connected home-security accounts but does not physically reinforce an entry point.

Why are physical and non-physical security measures both important?

They address different risks. Locks and doors control physical access, cameras and sensors support detection, passwords protect connected accounts, monitoring supports response, and insurance helps manage financial consequences.

What physical security measure should I improve first?

Start with any exterior door or window that does not secure properly. After correcting basic access-control weaknesses, review locks, frames, secondary entrances, lighting, cameras and other layers.