Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "c3_model" file in the game directory. The section below the "All Houses" heading should appear similarly to the following lines.

a b c d e f g h i j k l m n o p
q r s t ... to Z
House 1 -
Tents,{,-99,-10,0,0,0,0,0,0,0,0,0,0,0,0,0,3,25,5,5,1,,,2.5,,,,,,
House 2 -
Tents,{,-12,-5,0,1,0,0,0,0,0,0,0,0,0,0,0,3,25,10,7,1,,,3.5,,,,,,
House 3 -
Shacks,{,-7,0,0,1,0,0,1,0,0,0,1,0,0,0,0,3,25,15,9,1,,,4.5,,,,,,
House 4 -
Shacks,{,-2,4,0,1,1,0,1,0,0,0,1,0,0,0,0,3,25,20,11,1,,,5.5,,,,,,
House 5 -
HoveMs,{,2,8,0,2,1,0,1,0,0,0,1,0,0,0,0,3,22,25,13,2,,,13,,,,,,
House 6 -
HoveMs,{,6,12,10,2,1,0,1,0,0,0,1,0,0,0,0,3,22,30,15,2,,,15,,,,,,

The meaning of each entry in the file is as follows. Refer to the position of the values going across after "{" as a letter from A to S. In most cases, the lower the number, the less the demand for that item the houses need to evolve. Also, unless where specified, the lowest number should be a zero.

A: Desirability level at which the house will devolve. When set to "-99" you can build the house next to anything and it will evolve. Raise the value to "12" to make the house want a more desirable location in order to keep it from devolving.
B: Desirability level at which the house will evolve. When set to "-99" will make it require a number above -99 in order to evolve.
C: The higher the number, the more likely the house will devolve.
D: Water Supply.
E: Religion. The lower the value the less religion required.
F: Education.
G: Evolve back to. When set to "1", that house can devolve. When it is set to "0", the house cannot devolve.
H: Barber.
I: Bath.
J: Demands for health building (for example, doctor, hospital).
K: Food Access.
L: Pottery.
M: Oil.
N: Furniture.
O: Wine.
S: Number of people to occupy that building.