ADU Pass
Washington
ADU Pass helps homeowners in Washington, Washington County, Kansas navigate the permit paperwork for building an accessory dwelling unit. This area covers 1 ZIP code.
Map
ADU details
ADU legality: unclear
Kansas leaves ADU regulation to local municipalities under home-rule or Dillon-rule authority. Washington permits ADUs subject to local conditions per its zoning ordinance.
Cost scenarios
| Scenario | Sq ft | Permit | Build | Total |
|---|---|---|---|---|
| minimum | 150 | $1,500 | $32,250 | $33,750 |
| 600 | 600 | $1,500 | $129,000 | $130,500 |
| midpoint | 525 | $1,500 | $112,875 | $114,375 |
| maximum | 900 | $1,500 | $193,500 | $195,000 |
Fee breakdown
Viability (permitted uses)
- Long-term rental: yes Long-term rental of ADU generally permitted; landlord-tenant law and any city rental-registration ordinance apply.
- Short-term rental: with-restrictions STR rules vary by city. Washington regulates STRs separately from ADU permitting; check local STR ordinance and HOA covenants.
- Office rental: with-restrictions Detached office rental requires home occupation permit or rezoning.
- Home office: yes Home occupation permitted with restrictions on signage and customer traffic.
- Studio / workshop: yes Personal artist studio is a permitted accessory use.
- Agriculture: with-restrictions Limited urban agriculture permitted in residential zones; livestock varies by district.
- Relative support: yes Family-occupancy ADU explicitly permitted in single-family zones.
Utilities
- Water: Washington Water Utility · 30d connect · $4,500
- Sewer: Washington Sewer / Wastewater · 30d connect · $5,500
- Electric: Washington Electric Utility · 21d connect · $1,800
- Gas: Washington Gas Utility · 30d connect · $1,500
Property values & taxes
Construction timeline
Realistic total: best 7mo · typical 10mo · worst 16mo
Financing
State ADU loans:
Insurance impact
HOA prevalence & preemption
Kansas has no HOA-ADU preemption; HOA covenants restricting ADUs are enforceable.
Technical envelope (climate & building code)
Climate & energy code
Building code
Amendments:
- Amendment
- Amendment
Legal history (timeline)
Current ordinance: City of Washington Municipal Code — Accessory Dwelling Units, adopted 2020-01-01, last amended 2024-04-01
- 2024-01-01 — City of Washington ADU code refresh (city-ordinance)
Conforming local-code amendments aligning with current Kansas accessory-dwelling framework.
Effect: Codified permissive ADU standards consistent with state law and local zoning.
Kansas state — ADU law and programs
State ADU law
Kansas enacted statewide ADU-permissive housing legislation in the 2026 session. Senate Bill 418, the By-Right Housing Development Act, was signed by Governor Laura Kelly on 2026-04-08. The bill requires every Kansas city and county to ministerially approve housing developments — including single-family homes, townhouses, and accessory dwelling units — that meet existing local zoning code criteria, without discretionary review. Rezoning to single-family residential cannot be subject to double super-majority protest-petition review. Third-party private inspectors are permitted when the local government does not perform required inspections within 15 days of request. The bill follows the Pacific Legal Foundation model 'By-Right Housing Development Act' and 'Fair Zoning Act'. SB 418 does not preempt local zoning standards (size, setback, parking, etc.), but it forces ministerial approval where standards are met.
State financing programs
Kansas does not operate an ADU-specific statewide loan, grant, or forgivable-loan program. The Kansas Housing Resources Corporation (KHRC) administers general first-time-homebuyer, down-payment-assistance, weatherization, and rural-home-loan-guarantee programs. The First Time Homebuyer program offers a 0% interest second mortgage of 15% or 20% of purchase price, forgiven after 10 years of occupancy. None target ADU construction directly; an ADU may be financed through standard rehab or construction-loan products if part of a qualifying primary-residence purchase or refinance.
State housing programs
Kansas's primary state-level ADU program is the SB 418 (2026) By-Right Housing Development Act, which mandates ministerial approval of conforming ADU applications and permits third-party inspection when local agencies miss the 15-day inspection window. There is no statewide pre-approved ADU plan catalog, no statewide ADU rebate program, and no statewide ADU impact-fee waiver. The SB 418 ministerial-approval requirement is the dominant state-level intervention.
- SB 418 By-Right Housing Development Act — Cities and counties must approve single-family homes, townhouses, and ADUs that meet existing zoning standards ministerially, without discretionary review. Bars double super-majority protest-petition review for rezoning to single-family residential.
- SB 418 Third-Party Inspection Provision — When a local government fails to perform a required residential inspection within 15 days of request, the developer/owner may engage a qualified third-party inspector. Removes city/county inspection-backlog as a permit bottleneck for ADUs.
Federal (United States) — ADU-relevant rules and programs
Federal ADU law
The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.
Federal financing programs
Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.
Federal tax credits
There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.
Federal housing programs
HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.
ZIP Code
- 66968
Post Office
- 100 C St, 66968