1 Acre, 1,296 Sq Ft, 150 Feet: Washington's HB 1345 Rural ADU Rules Explained
ADU Pilot Team
ADU Pilot Team
Bottom Line
Washington's HB 1345 was signed by Governor Ferguson on March 27, 2026, as Chapter 231 of the 2026 Session Laws, and takes effect June 11, 2026 [1][2]. The bill's official title is "establishing limitations on detached accessory dwelling units outside of urban growth areas" — not "authorizing" or "expanding." That word choice matters. HB 1345 gives Washington's roughly 28 GMA-planning counties permissive authority to allow one detached ADU per rural parcel outside an urban growth area (UGA), subject to eleven specific conditions: 1-acre minimum lot, 1,296 sq ft maximum gross floor area, within 150 feet of the principal dwelling, shared driveway, separate water meter, documented septic capacity, no parcel subdivision, and a population-accounting cap built into the county comprehensive plan [1].
Three things HB 1345 does not do: it does not force any county to allow rural ADUs (the statute uses "may"), it does not apply to the eleven non-GMA-planning counties, and it does not waive any of the binding constraints that actually decide whether a rural ADU is feasible — septic capacity under WAC 246-272A, permit-exempt well allocations under RCW 90.94, and county-level short-term rental rules. Before you spend money on plans, your first call is to your county planning department to ask three questions: Will you adopt the HB 1345 framework? When? And what additional restrictions will you keep (owner-occupancy, STR bans, WUI overlays)?
HB 1345's 11 Conditions for Rural Detached ADUs
If your county opts in, every detached rural ADU permitted under HB 1345 must satisfy all eleven of these statutory conditions [1]. There is no variance procedure for any of them.
| # | Requirement | Statutory text |
|---|---|---|
| 1 | One ADU per parcel | "No parcel may have more than one accessory dwelling unit, whether attached or detached" |
| 2 | Water supply | Subject to RCW 19.27.097 building permit water-availability rules and any county or Ecology groundwater mitigation |
| 3 | Combined water withdrawal | Cannot exceed RCW 90.44.050 use limitations for domestic use |
| 4 | Metered water | Each dwelling unit's water withdrawals must be metered separately |
| 5 | Septic capacity | Applicant must document that the existing or proposed sewage system can handle the additional demand |
| 6 | Maximum gross floor area | 1,296 sq ft; excludes garages, porches, and unfinished basements |
| 7 | Shared driveway | Must use the same driveway or means of ingress/egress as the principal unit |
| 8 | Proximity | Must be sited within 150 feet of the principal unit |
| 9 | "Flip" option | The detached ADU may be the existing principal dwelling, if a new principal dwelling is built on the same parcel |
| 10 | Minimum lot size | Not allowed on nonconforming lots under one acre |
| 11 | Anti-subdivision | The parcel may not be subdivided to evade the limits |
Section 2 of the bill amends RCW 36.70A.696 to import the existing Growth Management Act ADU definitions — "detached accessory dwelling unit," "principal unit," "gross floor area," and "short-term rental" (lodging fewer than 30 consecutive nights) — into the rural framework [1].
Two provisions that are conspicuously absent from HB 1345 should be on every rural homeowner's radar. There is no owner-occupancy mandate, and there is no statewide restriction on using a rural ADU as a short-term rental. The bill defines "short-term rental" but does not regulate it. Both decisions are left to county discretion, which means your county can keep its existing owner-occupancy rule (Clallam, Kitsap, and Skagit currently require it) and its existing STR cap (Jefferson, San Juan).
Permissive, Not Mandatory: Counties Are Not Required to Allow Rural ADUs
This is the single biggest misreading of HB 1345 circulating online. The operative statutory language is permissive: counties "may allow" rural detached ADUs subject to the eleven conditions. Counties are not required to opt in, and may keep current rules that are stricter (or rules that prohibit detached rural ADUs entirely) [1].
There are two layers of friction beneath the opt-in question:
GMA scope. HB 1345 amends the Growth Management Act (chapter 36.70A RCW) and applies only to counties that plan under RCW 36.70A.040. Roughly 28 of Washington's 39 counties fall into this category. Non-GMA counties — including parts of eastern Washington that operate under chapter 36.70 RCW (the Planning Enabling Act) instead — are outside the bill's reach. If you're in a non-GMA county, HB 1345 changes nothing for you, and the question is whether your county chooses to mirror its terms locally.
Comprehensive plan accounting. Even where a GMA county opts in, the new statute imposes a population cap on how much rural growth can be allocated to ADUs. Rural counties (per RCW 43.160.020) may allocate no more than 10 percent of their rural population target to ADUs in their comp plan; non-rural counties are capped at 7 percent. This is the Growth Management Hearings Board's guardrail against "stealth densification" of rural lands. Counties update this allocation only at their RCW 36.70A.130(5) periodic review cycle, and HB 1345 caps amendments to once every five years [1].
The practical timeline: even in a county that wants to opt in, ordinance drafting, public hearings, and a comp plan amendment can take six to eighteen months. Chelan County is moving fastest among the early adopters — its local rules taking effect July 1, 2026, essentially adopt the HB 1345 framework verbatim, with active enforcement of unpermitted units coupled to a voluntary amnesty pathway [3]. Other counties have not signaled timelines.
County-by-County: Who Already Allowed Rural ADUs, and Who Didn't
The pre-HB 1345 landscape was a patchwork. Some counties were already more permissive than HB 1345 will require. Others were dramatically stricter. The chart below covers eight rural-demand counties.
| County | Pre-HB 1345 detached rural ADU rule | Source |
|---|---|---|
| Jefferson | Allowed in Ag, Residential, Mixed Residential, Suburban Residential, and PD zones. Detached ADU min lot 7,500 sq ft outside RR-5 (which requires 5 ac for the primary). Max size scales with lot: ≥1 ac → 1,200 sq ft or 40% of primary, whichever less | [4] |
| San Juan | Allowed in RFF, RR, RGU, AG, FOR districts only. Min lot 5 ac (RR), 10 ac (AG), 20 ac (FOR). Max 1,000 sq ft. Lottery required outside UGAs — only 12% of the prior year's principal-residence permits become eligible. The 2026 lottery offered 8 slots (April 1–May 30, 2026) | [5] |
| Chelan | Allows one ADU per parcel outside UGA. New rules effective July 1, 2026, mirror HB 1345's 1,296 sq ft cap, 150 ft proximity, separate water meter, and one-acre minimum | [3] |
| Kitsap | Inside UGA: by-right. Outside UGA: conditional use permit required, and only attached ADUs or conversion of an existing detached structure are allowed — new-build detached ADU is effectively prohibited. Owner-occupancy required. Max 50% of primary or 900 sq ft | [6] |
| Clallam | Detached ADU allowed, max 1,250 sq ft or 50% of primary, owner-occupancy required (120 days per year), max 300 ft separation | [7] |
| Skagit | Recently raised max size from 900 to 1,200 sq ft and removed the 50%-of-primary cap. Owner or family-member occupancy required. Two-bedroom septic minimum | [8] |
| Spokane | One ADU per parcel in Rural-5, Rural Traditional, Rural Conservation, and Urban Reserve zones. Detached within 150 ft of primary | [9] |
| Whatcom | In the Rural district, attached only unless the parcel is ≥4.5 acres. Detached ADU on smaller rural parcels is not allowed. Max 1,248 sq ft | [10] |
A few observations from the table.
For Jefferson, Chelan, Skagit, and Spokane, HB 1345 is incremental — these counties already allow rural ADUs on roughly the terms the bill requires. The 1,296 sq ft cap is actually slightly larger than Jefferson's 1,200 sq ft ceiling.
For Kitsap, HB 1345 could be transformative if the county opts in: the conditional use permit barrier could drop, and new-build detached ADUs could become legal on rural parcels of one acre or more.
For San Juan, HB 1345 changes essentially nothing. Because the bill is permissive, the county can keep its 5/10/20-acre minimums and its lottery. If you own a 2-acre San Juan rural parcel, you still cannot build a detached ADU under either the county code or HB 1345.
For Whatcom, the 4.5-acre threshold for detached rural ADUs is stricter than HB 1345's one-acre floor. Whether Whatcom drops the threshold to one acre is a political question, not a legal one.
Septic: What WAC 246-272A Requires for a Second Dwelling
HB 1345 §1(1)(e) requires applicants to "provide documentation that the existing or proposed sewage or septic system is capable of handling the additional demand." It does not waive the underlying state on-site sewage system (OSS) rules, which are codified in WAC 246-272A and enforced by local health jurisdictions [11].
WAC 246-272A-0230 sets the minimum design flow at 120 gallons per bedroom per day, updated from 100 gpd in the April 2025 rule revision. For a single dwelling with one additional dwelling on the same OSS, the same per-bedroom standard applies to the second unit [11]. The math:
- A 2-bedroom ADU adds 240 gpd of design flow.
- A 3-bedroom primary dwelling already accounts for 360 gpd.
- Combined parcel design flow becomes 600 gpd.
That is the number your county health officer evaluates against your existing drainfield's design capacity. If the existing system was sized for a 3-bedroom primary and nothing more, the additional 240 gpd often pushes the parcel beyond its permitted capacity. Two outcomes from there: alteration of the existing system (added drainfield, larger tank), or a fully new system. Either is expensive in rural Washington — installed cost for a conventional gravity system ran $6,000–$15,000 in 2025; pressure distribution, $8,000–$18,000; mound systems (needed where soils don't perc), $10,000–$20,000; sand filter and advanced treatment, $15,000–$30,000 [12].
The size of the ADU's floor area is not what triggers the septic problem. The bedroom count does. A studio ADU in the corner of a 1,296 sq ft footprint and a 3-bedroom ADU in the same footprint have wildly different septic implications. This is the most common cost surprise rural homeowners encounter, and HB 1345 does nothing to soften it.
One practical note for Puget Sound counties: sites in designated Marine Recovery Areas (MRAs) face enhanced treatment requirements and annual operation and maintenance contracts on top of the installation cost.
Wells: What RCW 90.44.050 and RCW 90.94 Mean for a Second Dwelling
HB 1345 §1(1)(c) states that combined water withdrawal on the parcel may not exceed the use limitations in RCW 90.44.050. On paper, that statute caps single or group domestic permit-exempt wells at 5,000 gallons per day. In practice, the real cap is dramatically lower in most rural Washington basins because of the Streamflow Restoration Act (RCW 90.94 / ESHB 1382, 2018, the legislative response to the Whatcom County v. Hirst decision). In the fifteen affected Water Resource Inventory Areas (WRIAs), new permit-exempt wells are limited to 950 gallons per day annual-average, and within some of those WRIAs new wells drilled after June 27, 2020 are further limited to 500 gpd indoor use plus outdoor watering of no more than 1/12 acre [13][14]. The most restrictive basins (Nooksack / WRIA 1 among them) tighten the cap further through county-adopted local mitigation plans.
Critically, a second dwelling on the same parcel shares the parent well's allocation. It does not get a fresh allotment. The separate-meter requirement in HB 1345 is a measurement device, not a water right. If your primary dwelling already runs 350 gpd of indoor use, you have 150 gpd of headroom under the 500 gpd cap — which a two-person ADU can absorb at typical indoor usage of 60–80 gpd per person, but with no margin for outdoor irrigation, livestock, or guests.
For homeowners in Nooksack, Methow, Walla Walla, or other RCW 90.94 instream-flow-restricted basins, the well allocation is often the binding constraint on whether a rural ADU is feasible at all. HB 1345 cannot relax it; the cap is set by separate statute.
If you are uncertain whether your basin is subject to RCW 90.94 limits, the Department of Ecology maintains a permit-exempt well guidance page that lists affected WRIAs and the per-WRIA mitigation programs.
What HB 1345 Doesn't Touch: Owner-Occupancy, STR, WUI
Three issues that homeowners assume are addressed by HB 1345 — and aren't.
Owner-occupancy. The bill is silent. Counties may keep their existing requirements (Clallam at 120 days per year, Kitsap, Skagit) and may add new ones when they adopt the HB 1345 framework. If you intend to use a rural ADU as a rental, this is the first county-code question to ask.
Short-term rentals. HB 1345 defines short-term rental (fewer than 30 consecutive nights) but does not regulate it for rural ADUs. Existing county STR rules continue to bind:
- San Juan County: detached ADUs permitted on or after June 29, 2007 cannot be vacation rentals under SJCC 18.40.275, and the countywide cap is 405 vacation rental permits [5].
- Jefferson County: either the primary residence or the ADU may be a short-term rental, but not both, and the countywide cap is 4% of housing stock [4].
- Chelan County: STRs run on a separate permitting track from HB 1345 ADU permits.
Wildland-Urban Interface code. As of May 2026, Washington has no enforceable statewide WUI code applicable to rural ADUs. The 2018 IWUIC was adopted as WAC 51-55 effective October 29, 2023, but ESB 6120 (2024) halted enforcement pending Department of Natural Resources wildfire hazard maps. SBCC then formally rescinded the 2021 IWUIC amendments in January 2025, and the DNR map is expected to be finalized by December 1, 2026 under RCW 19.27.560 [15]. Until then, county WUI overlays and fire marshal defensible-space rules continue to apply on a county-by-county basis. East-Cascade homeowners should watch the DNR map closely — it will likely re-introduce statewide WUI requirements once published, with construction-cost implications for any ADU built after the map becomes operative.
Code Enforcement: Doubled Fees, $1,000 Infractions, and Three-Year Bans
HB 1345 §1(2) requires opt-in counties to set up a code enforcement framework with sharper teeth than most rural homeowners expect [1]. The structure works like this:
- A voluntary amnesty pathway: owners of pre-existing unpermitted ADUs may come forward and bring units into compliance. The permit penalty during the amnesty window is "at least double the normal permit fee."
- For owners who do not comply: civil infraction of at least $1,000 plus a binary choice — physically remove the unpermitted ADU, or retrofit it to code.
- If the owner retains an unpermitted unit after enforcement action, the penalty rises to "at least triple the normal permit fee."
- Non-compliance triggers a three-year ban on receiving any permits for placement or construction of new ADUs on the parcel.
The practical implication: HB 1345 trades broader permissive authority for harder enforcement. If you currently have an unpermitted detached unit on rural land in a GMA county, the cleanest window to legalize is during your county's initial HB 1345 rollout amnesty. Waiting risks the doubled or tripled fees and the three-year permit ban.
Financing: USDA's June 1 Comment Deadline and the Fannie Mae Shift
Two financing developments matter to anyone building a rural Washington ADU in 2026, and they cut in opposite directions.
USDA SFHGLP proposed rule (comment closes June 1, 2026). USDA Rural Development published a proposed rule on March 31, 2026, that would amend 7 CFR Part 3555 to allow Single Family Housing Guaranteed Loan Program (SFHGLP) guarantees on properties with income-producing ADUs, and to add formal ADU definitions to §3555.10. Currently, ADU rental income is not usable for qualifying under USDA's Section 502 Guaranteed program, and properties with income-generating ADUs are disqualified. The proposed rule would close that gap. Public comments are accepted via regulations.gov under docket RHS-26-SFH-0100 through June 1, 2026 — nineteen days from publication of this article. If the rule is finalized, operational rollout requires a corresponding revision to USDA Handbook HB-1-3555, which typically follows by six to twelve months [16]. Rural Washington homeowners and builders should comment if they expect to use USDA financing for properties with ADUs.
Fannie Mae SEL-2025-08 (effective October 8, 2025). Fannie Mae now permits projected ADU rental income to be counted toward qualifying income on a one-unit primary residence with one ADU. The cap is 30% of the borrower's total qualifying income, documented via Form 1007 (rent schedule) or Form 1025 (small residential income property appraisal). Desktop Underwriter version 12.1 incorporates the change in Q1 2026; lenders may apply it immediately for manual underwriting [17]. This is the more important change for most rural Washington buyers — Fannie Mae financing is widely available in counties that fall outside USDA's eligibility map.
For homeowners financing an ADU on a property they already own, HELOC and cash-out refinance remain the primary tools. National average HELOC rates were approximately 7.2% in early May 2026 (Bankrate); Washington-specific products like BECU's HELOC ranged from 6.99% to 9.84% APR depending on credit profile and loan-to-value [18]. Verify rates at the time of application — they move daily.
A construction cost note: site-built detached ADUs in rural Washington commonly run $300,000 to $550,000 all-in, with $40,000 to $80,000 of that attributable to rural infrastructure (new septic, well, electrical service extension, driveway) that an urban infill ADU avoids. These figures are industry estimates from regional builders; no Washington state agency publishes a rural ADU cost dataset.
Property tax impact: Washington has no Proposition 13 equivalent. Under RCW 84.40, new improvements are revalued at full market value at the next assessment cycle, and the basis is not capped. A $200,000 increase in assessed value at a typical 1% effective rate adds roughly $2,000 per year in property tax — permanently. Buyers and existing owners considering an ADU as an income-generating asset should run this number into their break-even.
Decision Framework: Should You Wait or Build Now?
For most rural Washington homeowners, the right path depends on three questions that have to be answered in order.
Question 1: Is your county a GMA-planning county, and does it intend to opt in? Call planning. If the answer is no on either count, HB 1345 doesn't help you, and your options are governed entirely by existing county code. If the answer is yes, ask for the expected adoption timeline. Chelan is the early model; most others have not committed.
Question 2: Does your parcel clear the hard floors — one acre, septic capacity for an additional 240 gpd minimum, water-right allocation under your basin's RCW 90.44/90.94 cap? If any of these fails, no county adoption of HB 1345 will save the project. The septic and water analyses are best done by a licensed engineer or your local health jurisdiction, not estimated. Pay for the site evaluation before drawing plans.
Question 3: Will the county keep an owner-occupancy or STR restriction that defeats your business case? If you plan to use the ADU as a vacation rental in San Juan or Jefferson, current county code is the binding constraint — HB 1345 is irrelevant. If you plan to use it as a long-term rental, owner-occupancy carve-outs in Clallam, Kitsap, and Skagit may force you to live in one of the two units yourself.
The cleanest case for moving forward in 2026: a one-to-five-acre rural parcel in a GMA county that has signaled HB 1345 adoption, on a basin that is not subject to RCW 90.94 well limits, with a septic system designed for at least two more bedrooms of design flow, and a use case (family member, long-term rental in a no-restriction county) that survives existing county owner-occupancy and STR rules. That is a narrower set of parcels than the "rural Washington gets ADUs" framing suggests.
For comparison with another Pacific Northwest rural ADU regime, see our companion guide on Oregon's ORS 215.495 and the 2-acre minimum for rural ADUs. Oregon's framework is structurally different — it forces counties to allow rural ADUs under specified conditions but caps the size at 900 sq ft and requires a 2-acre minimum lot. Washington's HB 1345 is more permissive on size (1,296 sq ft) and lot (1 acre) but less binding on counties.
References
[1] Engrossed House Bill 1345, Chapter 231, Laws of 2026. Washington State Legislature. Effective June 11, 2026. Session law PDF: https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Session%20Laws/House/1345.SL.pdf. Bill summary and history: https://app.leg.wa.gov/BillSummary/?BillNumber=1345&Year=2026
[2] House Bill Report, EHB 1345, House Housing Committee. Washington State Legislature. https://lawfilesext.leg.wa.gov/biennium/2025-26/Htm/Bill%20Reports/House/1345%20HBR%20HOUS%2025.htm
[3] Chelan County, "New Rules Coming Our Way for Accessory Dwelling Units in Rural Areas." Effective July 1, 2026. https://www.co.chelan.wa.us/news/article/new-rules-coming-our-way-for-accessory-dwelling-units-in-rural-areas. Chelco Title 11.88: https://www.codepublishing.com/WA/ChelanCounty/html/Chelco11/Chelco1188.html
[4] Jefferson County Department of Community Development, "Accessory Dwelling Unit" guidance and Short-Term Rental Brochure (2025-04-09). https://www.co.jefferson.wa.us/DocumentCenter/View/629/ADU---Accessory-Dwelling-Unit-PDF and https://www.co.jefferson.wa.us/DocumentCenter/View/21336/Short-Term-Rental-Brochure-updated-2025-04-09
[5] San Juan County Code Title 18.40 and Vacation Rentals information page. https://www.codepublishing.com/WA/SanJuanCounty/html/SanJuanCounty18/SanJuanCounty1840.html and https://www.sanjuancountywa.gov/1579/Vacation-Rentals-Information-and-Applica. 2026 ADU lottery (8 slots, April 1–May 30): San Juan Islander, https://sanjuanislander.com/8-eligibility-slots-available-in-countys-adu-lottery-open-april-1-may-30-2026/
[6] Kitsap County Code Title 17.415 and Department of Community Development ADU guidance. https://www.codepublishing.com/WA/KitsapCounty/html/Kitsap17/Kitsap17415.html and https://www.kitsap.gov/dcd/FormsandBrochures/Accessory%20Dwelling%20Unit.pdf
[7] Clallam County Code 33.50.040. https://clallam.county.codes/CCC/33.50.040
[8] Skagit County Planning and Development Services, "Accessory Dwelling Units." https://www.skagitcounty.net/PlanningAndPermit/Documents/forms/Accessory%20Building%20and%20Dwelling%20Units/Accessory%20Dwelling%20Units.pdf
[9] Spokane County Building Department, Information Bulletin BP-75, "Accessory Dwelling Units – Detached." https://www.spokanecounty.gov/DocumentCenter/View/682/BP-75-Accessory-Dwelling-Units---Detached-PDF
[10] Whatcom County Code Title 20.36 (Rural District). https://www.codepublishing.com/WA/WhatcomCounty/html/WhatcomCounty20/WhatcomCounty2036.html
[11] WAC 246-272A-0230, On-site Sewage Systems – Design Flow and System Sizing. Washington State Department of Health. Effective April 1, 2025 (updated). https://app.leg.wa.gov/wac/default.aspx?cite=246-272A-0230
[12] On-site sewage system installed cost ranges (industry estimates, 2025): Caring Real Estate, "Septic System Pricing Guide for Washington State Homeowners (2025)," https://www.caringrealestate.com/blog/septic-system-pricing-guide-for-washington-state-homeowners-2025/; cross-checked against HomeAdvisor 2025 data, https://www.homeadvisor.com/cost/plumbing/install-a-septic-tank/. WA DOH technical guidance for mound systems (Publication 337-008, October 2025): https://doh.wa.gov/sites/default/files/2022-02/337-008.pdf
[13] RCW 90.44.050, Permit to withdraw – Permit-exempt withdrawals. https://app.leg.wa.gov/rcw/default.aspx?cite=90.44.050. Department of Ecology guidance on groundwater permit exemption: https://ecology.wa.gov/water-shorelines/water-supply/water-rights/groundwater-permit-exemption
[14] RCW 90.94, Streamflow Restoration (ESHB 1382, 2018). https://app.leg.wa.gov/rcw/default.aspx?cite=90.94&full=true. Department of Ecology streamflow restoration program: https://ecology.wa.gov/water-shorelines/water-supply/improving-streamflows
[15] Washington State Building Code Council, 2021 Washington WUI Code adoption history; ESB 6120 (2024) enforcement halt; SBCC January 2025 rescission of WAC 51-55 IWUIC amendments. RCW 19.27.560 (DNR wildfire hazard map deadline): https://app.leg.wa.gov/rcw/default.aspx?cite=19.27.560. Washington Resource Conservation Districts, "WUI Mitigation Comparison Report for Washington" (October 12, 2025): https://washingtonrcd.org/wp-content/uploads/2025/10/FINAL-WUI-Mitigation-Comparison-Report-for-WA_20251012.pdf
[16] USDA Rural Housing Service, "Single Family Housing Guaranteed Loan Program — Income-Producing Accessory Dwelling Unit (ADU) Provisions." Federal Register, March 31, 2026, FR Doc. 2026-06173, Docket RHS-26-SFH-0100, RIN 0575-AD45. Comment period closes June 1, 2026. https://www.federalregister.gov/documents/2026/03/31/2026-06173/single-family-housing-guaranteed-loan-program-income-producing-accessory-dwelling-unit-adu and https://www.regulations.gov/commenton/RHS-26-SFH-0100-0001. Current 7 CFR Part 3555: https://www.ecfr.gov/current/title-7/subtitle-B/chapter-XXXV/part-3555
[17] Fannie Mae Selling Guide Announcement SEL-2025-08, October 8, 2025. https://singlefamily.fanniemae.com/media/43851/display. Current Selling Guide section B3-3.8-01, Rental Income: https://selling-guide.fanniemae.com/sel/b3-3.8-01/rental-income
[18] HELOC and home equity loan national average rates: Bankrate, May 2026 weekly updates. https://www.bankrate.com/home-equity/heloc-rates/. Washington credit union products: BECU home equity products page, rates posted May 1, 2026. https://www.becu.org/loans-and-mortgages/home-loans/home-equity
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