RCW 84.36.400 exempts from taxation any physical improvement to a detached single family dwelling for the three assessment years subsequent to the completion of the improvement, up to 30% of the value of the original structure. This can provide substantial tax savings for homeowners who remodel or expand their homes. This home improvement exemption may be claimed only once in a 5-year period. Normal maintenance work does not qualify for this exemption. Notice must be filed with the Assessor prior to completion of the improvement to claim the exemption.
Click here for the Home Improvement Exemption application.