D6 Cluster Table: Home That A Villain's Just Fled Into...

Here's an example I rigged up for this building-generator method.

Random house that a villain just ran into...

Out-facing numbers (exterior of the house):

1-Door
2-Window
3-Locked door
4-Locked window
5-Second-floor window
6-Second-floor locked window

(Lowest outfacing number is a door if neither a 1 or 2 has been rolled.)

Up-facing numbers (Type of room)

1-Kitchen
2-W.C.
3-Dining room
4-Library
5-Living room/parlor/common room
6-Bedroom

Interior numbers (start with the first room and move out from there. Each combination describes what is in the next room in that direction.)

1-1 Locked door--empty room
1-2 Locked door--empty room
1-3 No door--empty room
1-4 No door--empty room
1-5 Door--empty room
1-6 Door-empty room
2-2 Villain with ambush prepared. Will attack first PC through door
2-3 d4 NPCs who live there, unaware of intruder
2-4 d4 NPCs who live there, heard but did not see intruder
2-5 NPC who lives there, saw intruder and is hiding
2-6 NPC who ambushes PCs, thinking they're burglars
3-3 NPC just killed by fleeing villain
3-4 Barking dog
3-5 Slippery carpet on hardwood floor-- dex check/save or fall. Villain may then attack.
3-6 Villain went this way--pieces of broken glass everywhere, act as caltrops
4-4 Locked door, Villain behind it
4-5 Locked door, cowering homeowner behind it
4-6 Door hastily rigged shut by villain
5-5 Villain with ambush prepared. Will attack first PC through door
5-6 Heavy furnished shoved in front of door to impede PCs
6-6 Villain's set room on fire as obstacle

(Is it possible the villain isn't in the building once the PCs get there? Sure.)