When it comes to divorce, most people focus on equitably dividing tangible assets. However, courts may also look at assets one spouse owned before the marriage, but said asset has since grown in value over the course of the marriage. This is the enhancement of value, and it comes into play in divorces more often than you may think.
In a landmark court case called Mitchell v. Mitchell, a husband owned a home prior to the marriage, but over the years, the couple enhanced it using marital funds. The court found that the upgrades to the house, mostly wallpapering, was negligible, but the house increased in value due to the passive force of the housing market. The court found this increase in value was marital property, and the couple had to divide the valuation accordingly.