01 — How landscaping affects home security
The same features that create privacy for a homeowner create concealment for an intruder
Crime Prevention Through Environmental Design (CPTED) is a body of criminological research, developed from Oscar Newman's concept of defensible space and formalized by criminologist C. Ray Jeffery, that examines how physical environment design influences criminal behavior. The core insight for residential landscaping is straightforward: burglars rely on concealment to work unobserved. Landscaping that limits sightlines from the street or from neighboring properties provides exactly the cover that increases the time available for an attempt to go unnoticed.
The Colorado Division of Criminal Justice, summarizing the research literature, reports that effective CPTED implementation has been shown to reduce crime by more than 60 percent in some studies. The practical landscaping principles that follow from the research are specific and consistent across multiple law enforcement CPTED guides. Shrubs should be maintained at no more than 3 feet in height adjacent to the home, particularly near windows and entry points. Trees should be pruned so that the lowest branches are at least 6 feet from the ground, which eliminates them as climbing aids and maintains visibility beneath the canopy. Both rules serve the same purpose: ensuring that a person standing near the home is visible from the street and from neighboring properties.
- Keep shrubs below 3 feet near windows and entry doors. Multiple law enforcement CPTED guides, including those published by the City of Everett WA police and the Apache Junction AZ city government, specify the 3-foot maximum. Shrubs taller than this create concealment at exactly the height and location where an intruder would work. Decorative ground cover and low plantings maintain curb appeal without creating hiding cover.
- Prune tree canopies to at least 6 feet from ground level. Trees with low branches provide climbing access to upper-level windows and rooflines that might otherwise be inaccessible. High-pruned canopies also maintain sightlines across the property and eliminate hiding cover in the lower zone beneath the tree.
- Plant thorny shrubs under ground-floor windows. Barberry, hawthorn, pyracantha, or climbing roses positioned directly under ground-floor windows create a physical barrier that discourages casual approach. Most CPTED practitioner guides specifically recommend thorny or prickly species for this application. The plants serve as access deterrents rather than concealment.
- Maintain the "broken windows" effect in reverse. CPTED research consistently finds that well-maintained properties experience lower crime rates than neglected ones. Overgrown vegetation, accumulated debris, and unmaintained yards signal both reduced occupancy and reduced neighborhood vigilance. A property that appears well tended and occupied is a lower-probability target.
The balance point
Security landscaping is not about removing all vegetation. Privacy fencing and mature trees have genuine value. The principle is placement: dense screening immediately adjacent to entry points and ground-floor windows reduces security, while the same screening set back from the house line at the property perimeter can define territory without creating concealment at the critical locations.
02 — Protecting a vacant home during evacuation
A home that signals vacancy to neighbors invites attention from everyone else
Burglary rates following disaster evacuations rise for a documented reason: displaced occupants cannot monitor their properties, post-disaster chaos reduces law enforcement response capacity, and an empty neighborhood removes the natural surveillance of neighbors going about their routines. The protective measures for a vacant home during evacuation serve a single function: making the home appear occupied or actively monitored when it is neither.
The indicators that signal vacancy to an opportunistic observer are well understood: accumulated mail and newspapers, lights that are never on at night, a driveway that has been unused for days, and no visible activity. Each of these can be addressed before evacuation, and the combination of multiple addressed signals is more effective than any single measure. According to consumer affairs research citing FBI UCR data, homes that appear occupied and monitored are substantially less likely to be targeted than those that clearly signal absence.
- Stop mail and newspaper delivery or arrange pickup. Accumulated mail is one of the clearest vacancy signals available to passersby. The U.S. Postal Service holds mail without charge for up to 30 days through the Hold Mail service at usps.com. Newspapers should be paused or arranged for a trusted neighbor to collect daily.
- Use timers on interior lights. A home where interior lights cycle on and off according to a household's typical routine is substantially harder to identify as vacant than a dark home. Light timers are available for under $15 at hardware stores and can be set to approximate normal occupancy patterns in living areas and bedrooms.
- Park a vehicle in the driveway if possible. An empty driveway for multiple days signals absence directly. If a second vehicle can be left in the driveway, or if a trusted neighbor can occasionally move their own vehicle to the space, the vacancy signal is disrupted.
- Ask a neighbor to check on the property. A trusted neighbor who walks past the home periodically, collects any packages that arrive, and reports anything unusual provides active surveillance that no electronic system matches. This also creates a social contract that most neighbors take seriously during evacuation events.
- Secure and document before leaving. Photograph the exterior and interior of the home before evacuating. This provides a baseline record if damage or theft occurs and supports insurance claims. Secure all entry points including windows, garage doors, and any secondary access points that may have been left casually unlocked.
Social media timing
Posting about an evacuation or displacement on social media, including location tags, photos of the empty home, or updates about being away, directly signals vacancy to anyone who has access to those posts. Delay public posts about the evacuation until after returning, or restrict them strictly to people who already know the household's location and status.
03 — Maintaining home security during a power outage
Electronic security degrades during outages; the mechanical and behavioral layers remain
Extended power outages create a security environment different from normal operations. Motion-activated exterior lighting does not function without power unless the fixtures have battery backup. Powered alarm systems may have battery backup for several hours but eventually go offline. Electronic door locks that rely on a powered hub may fail open or locked depending on their design. Video doorbells and camera systems dependent on home WiFi lose their monitoring function when routers lose power. The security layer that remains fully operational throughout any outage is the physical and behavioral layer: locks, deadbolts, bars, human awareness, and neighborhood communication.
The security response to a power outage is to consciously shift from reliance on automated systems to reliance on physical hardening and social awareness. This means verifying that all physical locks are engaged (many households become habituated to electronic locks and may not carry keys), establishing a temporary watch arrangement with trusted neighbors, and adjusting lighting with battery-powered options where possible. The UNC Charlotte burglar study found that the presence of people nearby and the perception of being watched were among the most powerful deterrents, more than any single electronic system.
- Verify manual locks on all doors and windows before dark. During normal operations, electronic systems often provide a false sense that manual verification is unnecessary. During an outage, confirm that every deadbolt is thrown, every window pin is in place, and every sliding door bar is engaged. This takes less than five minutes and closes the gap left by offline systems.
- Battery-powered lighting at entry points. Solar-charged pathway lights and battery-powered motion sensors can maintain some lighting function at entry points during a grid outage. The goal is not to replicate normal security lighting but to prevent total darkness at the front door and primary entry points, which is the condition most useful to an intruder.
- Coordinate with neighbors. An informal neighborhood watch arrangement during an extended outage is more effective than any battery backup system. Neighbors who are watching for each other's properties and have agreed to contact one another about unusual activity maintain the human surveillance component that electronic systems attempt to replicate. This is particularly important in the first 48 to 72 hours of an extended outage, when opportunists are most active.
- Know how your electronic lock behaves on battery failure. Some smart locks default to locked when power is lost; others default to unlocked for fire safety compliance. Consult the manufacturer documentation for any electronic lock installed on an exterior door and understand its failure mode before an outage occurs.
04 — Protecting damaged property after a disaster
What you document before you clean up determines what your insurer actually pays
Most homeowners and renters insurance policies contain a duty-to-mitigate clause, standard contract language requiring the policyholder to take reasonable steps to prevent additional damage after a covered loss. The National Roofing Contractors Association states plainly that homeowners have an obligation under most insurance policies to protect their property from additional damage once an initial loss occurs. This is not the insurer being difficult. A small roof breach left uncovered for two weeks of rain can turn a manageable repair into a full structural and mold remediation claim, and the policy generally will not treat that escalation the same way it treats the original storm damage.
The practical challenge is that mitigation and documentation pull in opposite directions, and both are required. Covering a hole or boarding a window is exactly the kind of reasonable step the policy expects. Removing damaged materials, discarding ruined belongings, or beginning permanent repairs before the adjuster has seen the loss is not, and can complicate or reduce a claim if the insurer cannot verify the original extent of damage. The sequence that satisfies both obligations is straightforward: photograph and video everything first, from multiple angles and in the condition the disaster left it, then perform only the temporary measures needed to stop the damage from getting worse.
- Document before you touch anything. Photograph and video all damage from multiple angles, including wide shots for context and close-ups for detail, before any tarping, boarding, or cleanup begins. This is the baseline record the adjuster and the claim depend on.
- Approved temporary measures are expected, not optional. Tarping a damaged roof section, boarding broken windows, and shutting off a leaking pipe are standard duty-to-mitigate steps under most policies. Keep every receipt for materials and labor; these costs are typically reimbursable as part of the claim.
- Do not discard damaged items or begin permanent repairs before the adjuster visits. Ruined furniture, flooring, and structural materials are evidence of the loss. Removing them before documentation is complete, or before the insurer authorizes disposal, can create disputes over what was actually damaged and by what cause.
- Monitor the property after mitigation. A tarped roof or boarded window is a temporary measure, not a repair. Check it after subsequent weather events, and keep the property secured against unauthorized entry while permanent repairs are pending.
What counts as reasonable
The legal standard is "reasonable" steps, not extraordinary ones. Policyholders are not expected to put themselves in danger to protect property, and the specific actions expected depend on the circumstances. When in doubt about whether an action helps or hurts a claim, document first and call the insurer before taking any step beyond the obvious (tarping, boarding, shutting off an active leak).
05 — Neighborhood coordination during extended emergencies
A visibly organized street deters opportunists more effectively than any single home's defenses
Neighborhood Watch is one of the oldest crime prevention programs in the country. The National Sheriffs' Association established the National Neighborhood Watch Program in 1972 to help residents partner with local law enforcement and reduce crime through citizen involvement, and the program remains active today. Forming an informal watch arrangement with neighbors, whether or not it is formally registered with National Neighborhood Watch or a local sheriff's office, does not require police sponsorship to begin. What it requires is agreement among neighbors on what to watch for and how to communicate what they see.
During an extended emergency, an organized group of neighbors changes the security calculus for the entire street. An opportunist assessing a neighborhood for easy targets is discouraged by visible activity, communication between households, and the sense that someone is paying attention, the same natural-surveillance principle that underlies CPTED landscaping guidance. A single fortified home in an otherwise unmonitored, silent neighborhood is a less effective deterrent than a modest but visibly coordinated group of households looking out for each other.
- Agree on a check-in schedule. A simple daily or twice-daily check-in, in person, by text, or by radio, establishes a rhythm that makes an unusual silence noticeable. This does not require formal structure, only mutual agreement on timing.
- Watch each other's properties, not just your own. Neighbors who know which houses are occupied, which are vacant, and what normal activity looks like at each address can recognize an anomaly faster than any single household watching only its own property.
- Share information about suspicious activity promptly. A simple phone tree, group text, or radio channel lets one household's observation reach the whole group quickly, rather than being noticed and forgotten by one person.
- Observe and report, do not intervene. Established Neighborhood Watch guidance is consistent on this point: members are not a substitute for law enforcement. The role is to notice, document, and report suspicious activity to authorities, not to follow, confront, or detain anyone.
No sponsorship required to start
An informal group of neighbors who agree to watch out for each other during a specific emergency does not need police approval, a formal charter, or registration with any organization to begin. Formal Neighborhood Watch registration through the National Sheriffs' Association or a local sheriff's office adds resources, training, and signage, but the core practice, mutual awareness and prompt communication among neighbors, works whether or not it is ever formalized.
Quick reference
- Security landscaping: shrubs below 3 feet near windows and entry doors, tree canopies pruned above 6 feet, thorny plants directly under ground-floor windows. Well-maintained properties experience lower crime rates than neglected ones.
- Vacant home during evacuation: stop mail delivery (USPS Hold Mail), use light timers, park a vehicle if possible, ask a neighbor to check periodically. Delay social media posts about the evacuation until after returning.
- Outage security: shift from electronic to physical and behavioral layers. Verify manual locks on all entry points. Use battery-powered lighting at entries. Coordinate with neighbors for informal mutual watch. Know whether your electronic lock defaults to locked or unlocked on power failure.
- Damaged property after a disaster: document everything before touching it. Approved temporary measures (tarping, boarding, shutting off leaks) are expected and usually reimbursable. Do not discard damaged items or begin permanent repairs before the adjuster visits.
- Neighborhood coordination: informal watch groups need no police sponsorship to start. Agree on a check-in schedule, watch each other's properties, share information quickly, and observe and report rather than intervening.
Primary sources
- Colorado Division of Criminal Justice: CPTED Research Brief: the 60% crime reduction finding from Cozens and Love (2015); the low thorny bushes under ground-level windows recommendation; elimination of climbing access to upper levels as a CPTED principle.
- City of Everett WA Police Department: CPTED Guidance: the 3-foot shrub maximum and 6-foot tree canopy minimum as operational standards; the role of trimmed vegetation in natural surveillance; secondary lock recommendations for windows and sliders.
- UNC Charlotte: "Through the Eyes of a Burglar" (Kuhns et al., 2013): people nearby and perception of being watched as primary deterrents; 83% checked for security measures before attempting a burglary.
- ConsumerAffairs: Home Invasion Statistics (citing FBI UCR data): three steps to deter burglars during vacancy including light timers, maintaining appearance of occupancy, and pausing mail and newspaper services.
- National Roofing Contractors Association: the standard that homeowners have an obligation under most insurance policies to protect property from additional damage after an initial loss, and that approved temporary measures like tarping are typically reimbursable.
- Nolo: After the Fire or Disaster, Dealing With Your Insurance Company: the duty-to-mitigate concept, the requirement to photograph damage before mitigating it, and the distinction between temporary protective measures and permanent repairs that should wait for the adjuster.
- National Neighborhood Watch (National Sheriffs' Association): the program's 1972 founding, its function as a citizen partnership with law enforcement, and the observe-and-report role of members rather than direct intervention.