In order to escape you only need to pull all 8 levers, the locations of which are listed below. Power is needed for some levers. Once all 8 levers are pulled, you can walk through the front door to the buyable ending for $35,999. This guide I made is sloppy and I will try to fix it later.

Built in the Basement, power allows some levers to work and opens some blocked passageways.
Wire Locations:

• Vent Tunnel (upstairs by Mannequin Room, drops to Bathroom)
  
• Garage shelf
  
• Secret Area Closet/Bear Room (by the default Mystery Box spawn)

Handle Locations:

• Shed (in Backyard)

• Walk-In Closet (Leads to Secret Area by Bedroom)
  
• Basement Shelf
  
  
  Pack-A-Punch:
  Behind the Garage Door, to get there you need to pull the lever in the Secret Hospital Room.
  
  PaP Parts:
  Flag:
  • Secret Hospital Room on the floor by WunderFizz
    
  • Shed (in Backyard)
  "Pack a Punch" Head:
  • Basement Secret Tunnel to Secret Area
    
  • Backyard Playhouse (requires levers)
  Gears:
  • Dirt Room (Shed Secret Tunnel)
    
  • Secret Area Closet/Bear Room under the bear
• Cage/Jail Room
  
  
  Levers:
  You need 5 levers to open the front door, I don't know which do which, so here is all 8.
  
  Levers for Door:
  1. Behind the shelf in the Bedroom (make sure to open it using the painting)
     
  2. On Garage Stairs
     
  3. Secret Area Closet/Bear Room (by the default Mystery Box spawn)
     
  4. Secret Hospital Room, not in the actual Granny, additional room.
     
  5. Cage/Jail Room (*Requires Garage Stairs Lever & 1 other one)
     
  6. Spider Attic (*needs the Bedroom lever)
     
  7. Backyard Playhouse
     
  8. Outside Garage Door