Why does the assessed value change from year to year?

The assessed value must reflect 50% of market value. As market value changes, so does your assessment. For instance, if you add a garage to your home, the assessed value increases. However should your property be permanently damaged by fire, the assessed value would decrease. Property owners have a responsibility for reporting any changes made to their property that would affect its value. When you obtain a building permit, our office is notified by the Building Department.