Clark County, WA Accessory Structures: Garage Conversions (2026)
Garage conversion rules in Clark County, WA, sometimes called garage-to-ADU or accessory living unit conversions, govern permits, ceiling height, egress, and parking replacement.
Key Facts
- Garage conversion allowed
- Yes, as an ADU
- Nonconforming setback cutoff
- Predating April 26, 2024
- Height increase
- Not permitted in setback area
- Permits
- Building permit required
- Code section
- CCC 40.260.020(C)(1)(c)
Summary
Clark County lets you convert an existing garage into an accessory dwelling unit, including a garage within nonconforming setbacks if the nonconformity predated April 26, 2024 and the conversion does not raise the garage's height. The conversion must meet building code and the ADU standards of CCC 40.260.020.
Conversion of an existing garage, including existing garages within nonconforming setbacks; provided, that the nonconformity predated April 26, 2024, and the portion of the ADU within the setback does not increase the height of the existing garage.
Full Breakdown
Under CCC 40.260.020(C)(1), permitted urban ADU types include conversion of an existing garage. A garage sitting in a nonconforming setback may be converted provided the nonconformity predated April 26, 2024 and the ADU portion within the setback does not increase the garage's existing height. Rural RADUs (CCC 40.260.022(C)(3)(c)) allow conversion of a garage attached to a single-family dwelling. Any garage-to-living-space conversion requires building permits, must meet egress, insulation, and life-safety codes, and connect to public sewer and water. Freestanding garages built before the main house must stay non-habitable per CCC 40.260.010(C).
Violations & Fines
Converting a garage to living space without permits is a common violation drawing stop-work orders, retroactive permit fees, and orders to restore or bring the space up to code.
Frequently Asked Questions
Can I convert a garage that is too close to the property line?
Does a garage conversion count as one of my two ADUs?
Sources & Official References
Other rules in Clark County
Compare Clark County to another location·View the Washington accessory structures overview
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