Single Family Tax Exemption

Exemption for Physical Improvement to a Single Family Dwelling

Program Benefits

When you decide to make home improvements through remodeling and additions, there is a three-year property exemption program available. According to RCW 84.36.400, physical improvements to a single family dwelling upon real property are exempt from property tax for three assessment years after the improvements are completed to the extent that the improvement represents 30% or less of the value of the original structure.

Qualifying Definitions

Single family dwelling means a detached dwelling unit and the lot on which the dwelling stands which is designed for, and not occupied by, more than one family.

Physical improvement means any addition, remodeling, renovation, structural correction or repairs which materially adds to the value or condition of an existing dwelling, including the addition of, or repairs to, garages, carports and patios attached to and compatible with the dwelling. Improvements for tax exemption purposes do not include swimming pools, golf greens, fences, outbuildings, or general maintenance.

Application Process

The homeowner must file a claim for the exemption with the Assessor before the improvements are completed. (NOTE: The homeowner may not claim this exemption more than once in a five-year period on the same dwelling.)

When the improvements are completed, the homeowner must submit a written notice of completion to the Assessor.

Application Form

Example of Calculation

The following example should be used only as a general guide and cannot be relied upon for any other purpose.

In 2019, a homeowner completed the addition of a family room and the renovation of the kitchen. These improvements cost the homeowner $60,000.

Assessor determines true & fair value of dwelling prior to improvements: $150,000
Assessor determines true & fair value of improved dwelling: $200,000
Difference (value of physical improvements): $50,000
30% of the unimproved dwelling ($150,000 x 30% = $45,000)
Amount of Exemption: The lesser of the following two numbers:
- Difference between the value of the improved & unimproved dwelling ($50,000)
- 30% of the unimproved dwelling ($45,000)

The assessed value of the improved dwelling will be reduced by $45,000 for the next three assessment years (2020, 2021, and 2022).

Contact Information

Contact an Economic Development Specialist at: