The Massachusetts Department of Revenue (DOR) requires all cities and towns to revalue all property once every five years. DOR closely monitors the revaluation project from planning to data quality to analysis to a conclusion. Revaluation certification by DOR is required before the tax rate can be set for the following fiscal year. The objective of the revaluation is to ensure that all property is fully and fairly assessed.

In the interim years, the Town's values are adjusted according to the housing market and certified by the Department of Revenue.