2 Answers

The scale sizes are like making the furniture the right size to fit the house so they aren't too big or too small.

Doll House Scale
The first thing you need to know and one of the most important is that dolls houses are built to standard doll house scale. That is they are built to a certain size so furniture and decorations can universally be fitted into them. There are two standard scales for dolls houses: 1/12th scale and 1/24th scale. 1/12th scale is 12 times smaller that real size and 1/24th scale is 24 times smaller than real size. 1/12th scale is by far the most popular doll house scale and most furnishings and dolls houses are made to this scale. 1/24th scale is becoming more popular but there are far fewer furnishings available for this size doll house.