The Home Improvement exemption is an eight-year decreasing exemption on alterations, reconstruction or improvements which increase the assessed value of a one or two family home. The value of the home improvement must be at least $3,000, and is limited to $80,000 in increased market value. The project must be completed before an exemption is granted. Exemptions apply to county, town and special district taxes. School districts may opt out of this exemption. In the first year, 100 percent of the assessed value of the improvement is exempt. In the second year, 87.5 percent, in the third year, 75 percent and so on.

Home Improvement Tax Exemption applications may be obtained from the Nassau County Department of Assessment by calling (516) 571-1500 or visiting their office located at 240 Old Country Road in Mineola.