Panic Room Finder

Panic Room Finder

Discover the hidden spaces in your home through systematic mapping, dimension analysis, and non-destructive investigation.

When to Use This Skill

Use for:

• Mapping house dimensions room-by-room
• Identifying discrepancies suggesting hollow spaces
• Understanding historical hidden space patterns
• Non-destructive investigation techniques
• Safe room planning and conversion
• Exploring potential access points

NOT for:

• Illegal entry or trespassing
• Bypassing security systems
• Structural modifications without permits
• Anything that compromises home safety
• Breaking into spaces in rental properties without owner permission

The Discovery Framework

┌─────────────────────────────────────────────────────────────────┐
│                    HOLLOW SPACE DISCOVERY FLOW                   │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│  1. DOCUMENT          2. MEASURE           3. COMPARE            │
│  ├─ Blueprints        ├─ Room-by-room      ├─ Floor plan vs.    │
│  ├─ Building history  ├─ Floor to floor    │  actual dims       │
│  ├─ Age/era           ├─ Wall thickness    ├─ Room totals vs.   │
│  └─ Previous owners   └─ Closet depths     │  exterior          │
│                                                                  │
│  4. IDENTIFY          5. INVESTIGATE       6. ACCESS            │
│  ├─ Anomalies         ├─ Non-destructive   ├─ Find entry        │
│  ├─ Unusual walls     ├─ Acoustic test     ├─ Mechanical        │
│  ├─ Odd closets       ├─ Visual inspection │  triggers          │
│  └─ Stair gaps        └─ Camera scope      └─ Safe opening      │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

Historical Hidden Space Types

By Era

COLONIAL ERA (1600s-1800s):
├── Priest holes (religious hiding)
├── Slave passage rooms (Underground Railroad)
├── Root cellars with hidden sections
├── False chimney breasts
└── Hidden attic spaces

VICTORIAN ERA (1837-1901):
├── Servant passages between walls
├── Hidden butler's pantries
├── False walls in grand staircases
├── Hidden safes behind panels
└── Speaking tubes with hidden terminals

PROHIBITION ERA (1920-1933):
├── Speakeasy access tunnels
├── Hidden bars behind bookcases
├── False floor compartments
├── Basement hidden rooms
└── Garage false walls

MID-CENTURY (1940s-1960s):
├── Cold War fallout shelters
├── Basement bomb shelters
├── Hidden passages in large homes
├── False wall safes
└── Converted coal storage

MODERN ERA (1970s+):
├── Safe rooms (security)
├── Hidden gun safes
├── Converted closet spaces
├── Basement vault rooms
└── Custom hidden doors

By House Type

OLDER HOMES (pre-1950):
├── More likely to have organic hidden spaces
├── Multiple renovation layers
├── Unusual floor plans from additions
├── Thick walls with potential voids
├── Servants' quarters/passages

LARGE ESTATES:
├── Purpose-built hidden rooms
├── Panic rooms in master suites
├── Wine cellars with hidden sections
├── Basement vault rooms
└── Tunnel systems to outbuildings

URBAN ROWHOUSES:
├── Shared wall anomalies
├── Basement connections
├── Attic spaces across units
├── Coal chute conversions
└── Back stair hiding spaces

SUBURBAN HOMES:
├── Basement safe rooms
├── Under-stair storage (deeper than expected)
├── Garage hidden compartments
├── Attic access panels to hidden space
└── Crawl space extensions

The Mapping Process

Step 1: Gather Documentation

DOCUMENTS TO FIND:
├── Original blueprints (check county records)
├── Building permits (all renovations)
├── Survey maps (property lines, structures)
├── Previous listing photos (real estate archives)
├── Insurance inspection records
└── Historical society records (for older homes)

WHERE TO LOOK:
├── County recorder's office
├── Local building department
├── Historical society
├── Previous owner records
├── Original builder/architect (if known)
└── Realtor's historical files

Step 2: Room-by-Room Measurement

MEASURING PROTOCOL:

TOOLS NEEDED:
├── Laser distance measurer (highly recommended)
├── Standard tape measure (backup)
├── Graph paper (1/4" grid)
├── Smartphone (photos, notes)
└── Level (for checking true walls)

MEASUREMENT APPROACH:
├── Start from exterior walls (measure outside perimeter)
├── Measure each room interior
├── Measure wall thicknesses at doorways
├── Note ceiling heights per room
├── Measure closet depths especially
└── Record unusual features (alcoves, bumps, niches)

FORMULA:
Exterior perimeter area MINUS sum of interior room areas
= Total wall/void space

If this number is significantly larger than expected
for wall thickness (typically 4-8" per wall),
you may have hidden space.

Step 3: Floor-to-Floor Analysis

VERTICAL DISCREPANCIES:

Check for:
├── Floor height differences between rooms
├── Ceiling height vs. floor above
├── Stair landing positions vs. expected floor levels
├── Basement ceiling vs. first floor
└── Attic floor vs. rooms below

RED FLAGS:
├── "Lost" height between floors (2+ feet unexplained)
├── Stairs that should arrive somewhere but don't
├── Rooms that are shorter than adjacent rooms
├── Attic space that doesn't extend over whole house
└── Basement that doesn't extend under entire first floor

Identifying Anomalies

Visual Indicators

WALL CLUES:
├── Wall that sounds different when knocked (hollow vs. solid)
├── Trim or molding that doesn't match rest of house
├── Paint that doesn't quite match (newer patch)
├── Outlet plates at unusual heights
├── Baseboards that don't align with rest of room
├── Wallpaper seams in unexpected places
└── Door that opens to unexpected small space

FLOOR CLUES:
├── Flooring that doesn't match pattern
├── Areas that sound hollow when walked on
├── Unusual wear patterns to non-functional spot
├── Carpeting that's newer in one section
├── Floor register that doesn't connect to HVAC
└── Trapdoor-like cuts in hardwood

CEILING CLUES:
├── Attic access panels in unusual locations
├── Ceiling height changes within room
├── Crown molding that stops unexpectedly
├── Light fixtures in odd positions
├── Texture changes in ceiling
└── Evidence of patched openings

Mechanical Indicators

THINGS THAT MIGHT BE TRIGGERS:
├── Bookcases that seem heavier than expected
├── Wall sconces that don't work
├── Decorative panels that seem functional
├── Built-in cabinets with unusual depth
├── Fireplaces with odd proportions
├── Mirror frames that seem attached unusually
├── Light switches that don't control anything
└── Door frames with hidden hinges

COMMON HIDDEN DOOR MECHANISMS:
├── Push-release latches (push to open)
├── Hidden lever in adjacent object
├── Magnetic releases (strong magnet needed)
├── Remote control systems
├── Biometric locks (newer)
├── Book-pull releases (classic)
└── Light switch combinations

Non-Destructive Investigation

Acoustic Testing

THE KNOCK TEST:

1. Use knuckle or small rubber mallet
2. Knock systematically across wall surface
3. Listen for changes in sound:
   ├── Solid: dull thud
   ├── Stud: slightly different thud (every 16")
   ├── Hollow: distinct hollow sound
   └── Void: VERY hollow, almost drum-like

4. Mark suspicious areas with painter's tape
5. Map the hollow-sounding zones
6. Compare to expected wall construction

Electronic Detection

STUD FINDER (with limitations):
├── Can detect studs and sometimes wires
├── May show unusual spacing or gaps
├── Deep-scanning models better for this
└── Won't reveal what's in a void

THERMAL CAMERA:
├── May show temperature differences
├── Hidden rooms might be unconditioned (different temp)
├── Can reveal hidden ductwork or lack thereof
└── Smartphone attachments available (FLIR, etc.)

BORESCOPE/ENDOSCOPE:
├── Tiny camera on flexible cable
├── Insert through small drilled hole
├── See inside wall cavity
├── $20-100 USB versions work for most uses
├── Only use if you're VERY confident there's something
└── CAREFUL: This is minimally destructive

MOISTURE METER:
├── Can detect unusual moisture patterns
├── Hidden rooms without HVAC may be damper
├── Also useful for finding water damage

Visual Inspection Points

CHECK THESE ACCESS POINTS:
├── Attic: look for unused space, false floors
├── Basement: look for unusual walls, false ceilings
├── Utility closets: often hide access
├── Under stairs: classic hiding spot
├── Walk-in closets: check depth vs. adjacent room
├── Behind large mirrors: especially built-ins
└── Inside large cabinets: check for false backs

Safe Opening Procedures

When You Find a Hidden Space

BEFORE OPENING:

1. ASSESS SAFETY
   ├── Is the structure sound?
   ├── Any signs of current use? (fresh locks, etc.)
   ├── Any electrical/utility concerns?
   └── Any reason to involve professionals?

2. DOCUMENT
   ├── Photo everything before touching
   ├── Note the mechanism details
   ├── Record location precisely
   └── Video the opening process

3. VENTILATION CHECK
   ├── Sealed spaces may have poor air
   ├── Have someone with you
   ├── Open slowly, let air exchange
   └── Don't enter immediately if sealed for long time

4. PROCEED CAREFULLY
   ├── Use flashlight first (don't enter)
   ├── Check for stability of floor/structure
   ├── Look for animal/pest evidence
   └── No rushing—this space isn't going anywhere

What You Might Find

COMMON DISCOVERIES:
├── Empty space (most common)
├── Old storage (forgotten items)
├── Previous owner's hidden stash
├── Historical artifacts
├── Old newspapers/letters (insulation era)
├── Evidence of previous use (Prohibition, WWII)
├── Animal nests (abandoned space)
└── Outdated utility equipment

RARE BUT POSSIBLE:
├── Valuable items left behind
├── Historical significance
├── Structural concerns (why it was sealed)
└── Evidence of concerning activity (call authorities)

IF YOU FIND ANYTHING CONCERNING:
├── Do not disturb
├── Document with photos
├── Contact appropriate authorities
└── Wait for professional guidance

Converting to a Safe Room

If You Want to Create a Panic Room

IDEAL SAFE ROOM FEATURES:
├── Solid core door (or reinforced)
├── Door frame reinforcement
├── Secondary lock system (interior)
├── Communication (cell phone, landline, intercom)
├── Emergency supplies (water, first aid)
├── Battery backup for lights
├── Ventilation (passive or emergency)
└── Comfortable waiting capacity

LOCATION PRIORITIES:
├── Near bedrooms (accessible during home invasion)
├── Cell phone signal availability
├── Away from exterior walls (if possible)
├── Not obvious location (closet within bedroom)
└── Accessible to all family members

DIY VS. PROFESSIONAL:
├── Basic: reinforced closet (DIY possible)
├── Moderate: dedicated room conversion (contractor)
├── Advanced: purpose-built room (security specialist)
└── Always consult local building codes

Mapping Template

Room-by-Room Recording Sheet

ROOM: _______________
FLOOR: _______________

DIMENSIONS:
├── Length: _____ ft _____ in
├── Width: _____ ft _____ in
├── Height: _____ ft _____ in
└── Area: _____ sq ft

WALL THICKNESSES:
├── North wall: _____ in
├── South wall: _____ in
├── East wall: _____ in
└── West wall: _____ in

ANOMALIES NOTED:
├── Sound test results: _____________
├── Visual irregularities: _____________
├── Dimension discrepancies: _____________
└── Notes: _____________

ADJACENT SPACES:
├── Room to north: _______________
├── Room to south: _______________
├── Room to east: _______________
├── Room to west: _______________
├── Above: _______________
└── Below: _______________

Anti-Patterns

"Knocking Is Enough"

Wrong: Only doing the knock test and concluding. Why: Many factors affect wall sound; need multiple methods. Right: Combine knock test + measurements + visual inspection.

"Breaking Through"

Wrong: Making holes to investigate. Why: Destructive, may damage hidden room, hard to repair. Right: Use borescope only after exhausting other methods.

"Ignoring Safety"

Wrong: Entering a sealed space immediately. Why: Air quality, structural stability, unknown hazards. Right: Ventilate, document, assess before entering.

"Not Documenting"

Wrong: Just exploring without recording. Why: You may forget details, lose evidence of discovery. Right: Photos, videos, measurements before and during.

Integration Points

• diagramming-expert: Creating floor plans of findings
• interior-design-expert: Converting found space
• drone-cv-expert: Exterior mapping for discrepancy detection

---

Core Philosophy: Hidden spaces tell stories. Whether your house was a stop on the Underground Railroad, a Prohibition speakeasy, or just had an eccentric previous owner, the architecture remembers. Your job is to be a detective—patient, methodical, and respectful of what you might find.

Every hollow knock is a question. Take your time finding the answers.

House Measurement Templates

Room-by-Room Recording Sheet

Individual Room Template

┌─────────────────────────────────────────────────────────────────┐
│ ROOM: _____________________  FLOOR: _____ DATE: _____________   │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│ BASIC DIMENSIONS                                                 │
│ ├── Length: _______ ft _______ in                               │
│ ├── Width:  _______ ft _______ in                               │
│ ├── Ceiling height: _______ ft _______ in                       │
│ └── Calculated area: _______ sq ft                              │
│                                                                  │
│ WALL THICKNESS (measured at doorways)                           │
│ ├── North wall: _______ in   (adjacent room: ____________)      │
│ ├── South wall: _______ in   (adjacent room: ____________)      │
│ ├── East wall:  _______ in   (adjacent room: ____________)      │
│ └── West wall:  _______ in   (adjacent room: ____________)      │
│                                                                  │
│ CEILING/FLOOR                                                    │
│ ├── Room above: ________________  Ceiling of that room: ___     │
│ └── Room below: ________________  Floor to their ceiling: ___   │
│                                                                  │
│ FEATURES                                                         │
│ ├── Closets: ___ (depths: _____, _____, _____)                  │
│ ├── Windows: ___ (sizes: _____, _____, _____)                   │
│ ├── Doors: ___   (swing direction: _____)                       │
│ ├── Fireplace: Y / N  (depth into room: _____)                  │
│ ├── Built-ins: Y / N  (depths: _____, _____)                    │
│ └── Other features: _____________________________               │
│                                                                  │
│ ANOMALIES NOTED                                                  │
│ ├── Sound test results: _____________________________           │
│ ├── Visual irregularities: _____________________________        │
│ └── Dimension discrepancies: _____________________________      │
│                                                                  │
│ SKETCH (not to scale, note features):                           │
│                                                                  │
│                                                                  │
│                                                                  │
│                                                                  │
│                                                                  │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

Floor Plan Master Template

┌─────────────────────────────────────────────────────────────────┐
│ FLOOR: ___________    TOTAL EXTERIOR: _____ x _____ ft          │
│ EXTERIOR AREA: _______ sq ft                                     │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│ ROOM INVENTORY                                                   │
│ ┌─────────────────────┬──────────┬──────────┬────────────────┐  │
│ │ Room                │ L x W    │ Sq Ft    │ Ceiling Ht     │  │
│ ├─────────────────────┼──────────┼──────────┼────────────────┤  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ │                     │          │          │                │  │
│ ├─────────────────────┼──────────┼──────────┼────────────────┤  │
│ │ TOTAL INTERIOR      │    -     │          │       -        │  │
│ └─────────────────────┴──────────┴──────────┴────────────────┘  │
│                                                                  │
│ VOID CALCULATION                                                 │
│ ├── Exterior footprint area:     _______ sq ft                  │
│ ├── Sum of interior room areas:  _______ sq ft                  │
│ ├── Expected wall space (~10%):  _______ sq ft                  │
│ ├── CALCULATED VOID:             _______ sq ft                  │
│ │                                                                │
│ │   (Exterior - Interior - Wall allowance = Potential void)     │
│ │                                                                │
│ └── Void > 50 sq ft = INVESTIGATE FURTHER                       │
│                                                                  │
│ FLOOR HEIGHT ANALYSIS                                            │
│ ├── This floor ceiling height:   _______ ft                     │
│ ├── Floor above floor height:    _______ ft                     │
│ ├── Measured distance between:   _______ ft                     │
│ ├── Expected (ceiling + floor):  _______ ft                     │
│ └── DISCREPANCY:                 _______ ft                     │
│                                                                  │
│     Discrepancy > 18" = INVESTIGATE FURTHER                     │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

Wall Thickness Standards

Normal Wall Thicknesses

WHAT TO EXPECT
──────────────

INTERIOR WALLS (non-load-bearing):
├── Standard drywall both sides: 4.5" - 5"
│   (2x4 stud + 2 layers 1/2" drywall)
├── With plaster (older homes): 5" - 6"
└── With soundproofing: 6" - 7"

INTERIOR WALLS (load-bearing):
├── Standard: 6" - 6.5"
│   (2x6 stud + drywall)
└── Older construction: 7" - 8"

EXTERIOR WALLS:
├── Standard 2x4 + insulation + sheathing + siding: 6" - 8"
├── Standard 2x6 construction: 8" - 10"
├── Brick veneer addition: +4"
├── Stone veneer: +4" to +8"
└── Old solid masonry: 12" - 24"

SUSPICIOUS THICKNESSES
──────────────────────
Interior wall > 8":  Possibly contains ductwork, plumbing, OR hidden space
Interior wall > 12": Almost certainly unusual—investigate
Wall doesn't match adjacent wall: Something different inside

Measurement Technique

HOW TO MEASURE WALL THICKNESS
─────────────────────────────

AT DOORWAYS:
├── Measure from door frame edge to edge
├── Subtract door frame thickness (typically 3/4" each side)
├── Result = structural wall thickness

AT WINDOWS:
├── Measure window sill depth
├── This often equals wall thickness
└── Check for discrepancies with interior measurement

BETWEEN ROOMS:
├── Measure from wall surface in Room A
├── Add any closet depths
├── Compare to distance in Room B
└── Difference = wall thickness (or void)

Discrepancy Calculator

FINDING HIDDEN SPACE: THE MATH
──────────────────────────────

HORIZONTAL (same floor):
────────────────────────

Room A width:        _________ ft
Wall thickness:      + ________ ft (usually 0.5 ft / 6 inches)
Room B width:        + ________ ft
                     ──────────────
Expected total:      _________ ft

Actual measured
(exterior or hallway): ________ ft
                       ──────────────
DISCREPANCY:           ________ ft

If discrepancy > 1 ft = Possible hidden space


VERTICAL (between floors):
──────────────────────────

Floor 1 ceiling height:     _________ ft
Floor structure (typical):  + 1 ft (joists + subfloor)
Floor 2 floor height:       + ________ ft
                            ──────────────
Expected total:             _________ ft

Actual measured
(basement to 2nd floor):    _________ ft
                            ──────────────
DISCREPANCY:                _________ ft

If discrepancy > 1.5 ft = Possible hidden space

Grid Paper Floor Plan

INSTRUCTIONS FOR SKETCHING
──────────────────────────

1. Start with exterior walls
   ├── Measure each exterior wall
   ├── Use scale: 1 square = 1 foot (or 0.5 foot for detail)
   └── Note any jogs, bays, or extensions

2. Add major interior walls
   ├── Locate wall starting points from exterior
   ├── Measure wall lengths
   └── Note door locations and swing directions

3. Add features
   ├── Closets (with depths)
   ├── Stairs (note direction)
   ├── Chimneys and fireplaces
   ├── Built-in furniture
   └── Unusual features

4. Mark measurements
   ├── Label each room with dimensions
   ├── Note ceiling heights
   └── Mark wall thicknesses at key points

5. Identify anomalies
   ├── Circle areas that don't add up
   ├── Note areas for acoustic testing
   └── Mark suspected void locations

Acoustic Testing Record

┌─────────────────────────────────────────────────────────────────┐
│ ACOUSTIC (KNOCK) TEST RECORD                                     │
│ Room: _________________ Wall: _________________ Date: _________  │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│ TEST GRID (mark each square with result code)                   │
│                                                                  │
│     1    2    3    4    5    6    7    8    9    10   (feet)    │
│   ┌────┬────┬────┬────┬────┬────┬────┬────┬────┬────┐          │
│ 8 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 7 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 6 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 5 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 4 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 3 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 2 │    │    │    │    │    │    │    │    │    │    │          │
│   ├────┼────┼────┼────┼────┼────┼────┼────┼────┼────┤          │
│ 1 │    │    │    │    │    │    │    │    │    │    │          │
│   └────┴────┴────┴────┴────┴────┴────┴────┴────┴────┘          │
│                                                                  │
│ RESULT CODES:                                                    │
│ S = Solid (dull thud, consistent)                               │
│ T = Stud (slightly different, every 16" normal)                 │
│ H = Hollow (distinctly hollow sound)                            │
│ V = Void (very hollow, drum-like)                               │
│ ? = Unusual (investigate further)                               │
│                                                                  │
│ NOTES:                                                           │
│ ____________________________________________________________    │
│ ____________________________________________________________    │
│ ____________________________________________________________    │
│                                                                  │
│ AREAS FOR FURTHER INVESTIGATION:                                │
│ ____________________________________________________________    │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

House History Checklist

RESEARCH CHECKLIST
──────────────────

□ Year built: ___________
□ Original owner: ___________
□ Architectural style: ___________
□ Known additions/renovations: ___________

HISTORICAL FEATURES TO LOOK FOR:
────────────────────────────────

Built pre-1870:
□ Possible servant passages
□ Root cellar (may have hidden section)
□ Ice box access
□ Coal storage areas

Built 1870-1920:
□ Servant stairs/passages
□ Speaking tubes
□ Butler's pantry with pass-throughs
□ Laundry chutes

Built 1920-1933 (Prohibition):
□ Hidden bars
□ Basement compartments
□ Trap doors
□ False walls

Built 1940-1965 (Cold War):
□ Fallout shelters
□ Basement reinforced areas
□ Emergency supply storage

Built 1970s-present:
□ Safe rooms
□ Media vault rooms
□ Hidden storage

DEED RESEARCH:
□ County recorder's office visited
□ Original blueprints obtained (Y/N)
□ Building permit history reviewed
□ Previous owners researched

Summary Investigation Sheet

┌─────────────────────────────────────────────────────────────────┐
│ HIDDEN SPACE INVESTIGATION SUMMARY                               │
│ Property: __________________________ Date: ____________________  │
├─────────────────────────────────────────────────────────────────┤
│                                                                  │
│ POTENTIAL VOID LOCATIONS IDENTIFIED:                            │
│                                                                  │
│ 1. Location: _____________________________________________      │
│    Evidence: _____________________________________________      │
│    Size estimate: _______ sq ft  Priority: High / Med / Low     │
│                                                                  │
│ 2. Location: _____________________________________________      │
│    Evidence: _____________________________________________      │
│    Size estimate: _______ sq ft  Priority: High / Med / Low     │
│                                                                  │
│ 3. Location: _____________________________________________      │
│    Evidence: _____________________________________________      │
│    Size estimate: _______ sq ft  Priority: High / Med / Low     │
│                                                                  │
│ NEXT STEPS:                                                      │
│ □ Detailed acoustic testing of priority areas                   │
│ □ Borescope inspection (minimally invasive)                     │
│ □ Thermal imaging survey                                        │
│ □ Professional assessment                                       │
│ □ Historical research                                           │
│ □ Other: _______________________________________________        │
│                                                                  │
│ NOTES:                                                           │
│ ____________________________________________________________    │
│ ____________________________________________________________    │
│ ____________________________________________________________    │
│ ____________________________________________________________    │
│                                                                  │
└─────────────────────────────────────────────────────────────────┘

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Pro tip: Take photos as you measure. Document everything. The measurement sheet is your detective's notebook—the more detail, the better your chances of finding what's hidden.