Shelter · Home Security
Seven layers, organized from the property perimeter inward to daily habits. Assess each one, build from the outside in.
How to use this framework
The seven layers run from the outermost ring of your property to your daily behavior inside it. Each one addresses a distinct part of the problem. A home that is strong in all seven layers is genuinely difficult to enter quickly and quietly — which is the goal, because most residential break-ins are opportunistic and time-sensitive.
The layers compound. Layers 1 and 2 shape the initial assessment from the street. Layers 3 and 4 slow physical entry. Layer 5 creates risk of detection. Layer 6 creates risk of being noticed and reported. Layer 7 closes the pathways hardware cannot.
Use this page as an assessment tool. Rate each layer honestly. Prioritize the weakest structural layer before adding electronic systems — cameras over an unlocked back door addresses a symptom, not the gap.
Quick self-assessment
01 · Perimeter and visibility
House numbers, landscaping, sight lines, fencing
02 · Lighting
Motion lights, entry lighting, timers during travel
03 · Doors and frames
Solid-core construction, deadbolts, strike plates
04 · Windows and secondary entries
Window locks, dowels, basement windows, sliding doors
05 · Electronic systems
Cameras, alarms, doorbell camera, sensors
06 · Social deterrents
Neighbor awareness, occupation signals, package management
07 · Daily habits
Locking routine, spare keys, visitor protocols, garage
Structural layers
These layers shape what someone sees from the street and how hard the building is to enter. They are the foundation everything else builds on.
The first security decision happens from the sidewalk or street — before anyone reaches your door. A home with clear sight lines, obvious house numbers, maintained landscaping, and marked territorial boundaries reads as occupied, noticed, and cared for.
Renters: Exterior landscaping is typically outside your control. Focus on house numbers (critical for emergency responders), keeping porch areas clear, and confirming your door viewer functions.
Lighting is the most consistently supported single security intervention across the crime prevention research. It eliminates concealment, creates natural surveillance, and signals active occupancy. It is also frequently the largest gap in an otherwise reasonable security setup.
Highest ROI
The primary physical barrier. This layer is where most households have the largest gap between perceived security and actual security. A quality deadbolt on a hollow-core door, or with standard strike plate screws, provides far less protection than its hardware rating suggests.
Every entry point that isn't a primary door. Ground-floor windows are used in a significant portion of no-forced-entry burglaries — often because a window lock hasn't been tested in years and no longer functions, or because the window was simply left open.
Electronic and behavioral layers
These layers work best when the structural layers are already in place. Layer 5 creates detection risk. Layer 6 creates social risk. Layer 7 closes the pathways hardware cannot address.
Detection and monitoring technology. This layer's value is in creating risk of being caught in the act — through visible cameras that may change approach behavior, alarm systems that trigger a response, and documentation that aids recovery and prosecution. It adds the most value when structural layers are solid.
Most underrated
The human network surrounding the home. Research on collective efficacy shows neighborhoods where residents know each other by name have substantially lower property crime rates than socially isolated neighborhoods with similar income levels.3 This is also the layer the security industry has the least interest in selling, because it doesn't involve a product.
Action this week: Introduce yourself to one neighbor you don't currently know by name. The connection, not the conversation, is the point.
The behavioral layer. FBI data shows roughly 4 in 10 residential burglaries involve no forced entry — an unlocked door or open window.4 No hardware upgrade addresses that statistic. Consistent locking routines do. Habits are the cheapest layer and the one most frequently underweight relative to hardware spending.
1 Cozens, Paul, Greg Saville, and David Hillier. "Crime Prevention Through Environmental Design (CPTED): A Review and Modern Bibliography." Property Management, vol. 23, no. 5, 2005. 2 ANSI/BHMA A156.30: American National Standard for High Security Cylinders and A156.36: Auxiliary Hardware. Current editions. 3 Sampson, Robert J., Stephen W. Raudenbush, and Felton Earls. "Neighborhoods and Violent Crime: A Multilevel Study of Collective Efficacy." Science, vol. 277, 1997. 4 Federal Bureau of Investigation. Uniform Crime Reports, "Crime in the United States," Property Crime — Method of Entry tables (multiple years).
How they compound
A home strong in all seven layers presents a fundamentally different risk profile than a home strong in only one or two. The compounding effect is not additive — it's more than the sum of its parts, because each layer constrains a different stage of the decision process.
Consider the sequence from an opportunistic perspective: the perimeter signals this property is occupied and maintained. The lighting means any approach will be visible. The door frame means forced entry will be slow and audible. The alarm means detection is imminent. The neighbor who saw the car means someone is already noting what's happening. The locking routine means the easy path — just trying the door — is closed.
No single layer does all of this. All seven together do. The investment in each layer is modest; the combined effect is substantially greater than any individual component.
Perimeter alone
Signals an occupied, maintained property. Shifts the initial street-level assessment. Deters the most casual passerby.
Add lighting
Eliminates concealment AND triggers a detection signal on approach. Anyone coming close will be visible and know it.
Add doors and windows
Physical hardening complete. Forced entry now requires real effort, real time, and audible noise. The quick-entry pathway is closed.
Add electronics
Detection risk added. Any attempt is being documented. An alarm may trigger a response. The risk/reward calculation has shifted significantly.
Add social deterrents and habits
A neighbor is likely to notice and report. The front door is locked. Every window latch works. The garage door is closed. There is no obvious easy entry. The home has moved well down the list of attractive targets.
Guides for each layer
This page is the framework. The layer-specific guides contain the full detail on each improvement — products, installation, and common mistakes.
Security Without Paranoia
The philosophy and evidence behind this framework. Start here if you haven't read it.
Door Security
Layer 3 in depth: solid-core doors, deadbolts, strike plate installation, sliding doors.
Window Security
Layer 4 in depth: locks, dowels, security film, basement windows, ground-floor gaps.
Lighting and Visibility
Layer 2 in depth: motion light placement, timers, smart switches, avoiding over-lighting.
Home Alarm Systems
Layer 5 in depth: monitored vs. self-monitored, sensor types, false alarm management.
Daily Security Habits
Layer 7 in depth: locking routines, spare keys, garage discipline, visitor protocols.
"We shape our buildings; thereafter they shape us."
Winston Churchill
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