ADUs are allowed in WaitsburgTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Waitsburg, WA
Is your property eligible for an ADU?
# of Properties
482
Owner-occupied
56%
Zoning districts
2
Avg Home Value
$262,686
Median Lot Size
0.29 acres
Avg Income
$67,487
Residential Types:
482 housing units
Single Family
95%
Other
5%
Zoning Districts:
3 parcels · 2 districts
PA-40
67%(2)
R-96
33%(1)
ADU Rules
What can you build in Waitsburg, WA?
Waitsburg, WA follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum internal ADU size of 800 sq ft in R-1 zoning (single-family; returns None if not R-1).
- –Maximum internal ADU size of 33% of the primary dwelling’s living area (uses HABITABLE_SQFT, falls back to GROSS_BUILDING_AREA_SQFT) in R-1; returns None if area unknown.
Detached ADU Size Limits
- –Waitsburg R-1: Detached ADU maximum size cap of 800 sq ft (absolute cap)
- –Waitsburg R-1: Detached ADU maximum of 33% of the primary dwelling's living area
Owner Occupancy
- –No owner-occupancy requirement.
Parking
- –1 off-street space/ADU (plus 2 for primary).
- –C-1 exempt; R-1: required where accessible; rear/driveway only; no on-street credit.
ADU State Law
What can you build in Washington?
- –ADUs are allowed by right, including attached, internal, and detached ADUs.
- –Local governments must allow up to two ADUs per lot.
- –Maximum ADU size is 1,000 sq ft for both attached and detached units.
- –ADU height is limited to 24 ft or the height of the principal dwelling, whichever is less.
- –Setbacks must use the less restrictive of accessory structure or principal dwelling standards.
- –Lot coverage and yard coverage rules may not be more restrictive than those applied to the principal home.
- –Parking requirements are capped, and parking cannot be required within ½ mile of major transit.
- –Owner occupancy may not be required for ADUs.
- –ADUs may be rented long-term or sold separately; local short-term rental rules may still apply.
- –Local governments may not regulate ADUs more restrictively than the principal unit. This includes setbacks, yard coverage, lot coverage, and height.
- –Cities and counties may be more permissive, but not more restrictive, than Washington's state ADU standards.
- –Some zoning rules still come from local code. Standards like FAR, bulk limits, and general lot coverage continue to apply as long as they do not prevent the lot from meeting the state-required ADU entitlements (e.g., allowing two ADUs with the required dimensions).
- –Washington's statewide ADU mandates apply only within Urban Growth Areas.
- –Outside UGAs, local zoning controls whether ADUs are allowed and under what conditions.
- –Additional constraints often apply outside UGAs, including septic capacity, fire access, water availability, and environmental regulations.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
Is your property eligible for an ADU?
ADU rules in other Washington municipalities
Rules change at the town line. Check the municipality your property is actually in.
Walla Walla County