Building permits, zoning and septic rules in Chelan County, Washington

At a glance

Building permit

County Community Development issues them in unincorporated areas; cities run their own¹²

Zoning

County zoning applies; lot size and setbacks depend on the parcel's district³⁸⁹

Septic permit

Required for new systems and most work; issued by the Chelan-Douglas Health District⁴¹⁰

Owner-builder

Contractor registration exemption available for work on your own property, except work intended for sale, demolition or lease¹¹

Tiny homes

Allowed as permanent dwellings under the state residential code; off-site wheeled units need state approval⁶

Park model RVs

Permanent dwelling use requires a county placement permit, qualifying certification, a permanent foundation and approved utilities⁷

Private wells

Some domestic, stock-water and small garden withdrawals are exempt from the state groundwater permit¹²

Who to call

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

Do you need a building permit in Chelan County, Washington?

Chelan County Community Development handles building-permit intake, plan review, permit issuance and inspections during construction in unincorporated Chelan County; cities inside the county run their own building permits.² The county enforces adopted international codes, Washington amendments and county requirements¹. Ask the Building Division whether a particular scope needs a permit before work begins; the available county facts do not establish a universal exemption for small projects. Manufactured and mobile homes have a specific county placement process: the county inspects the foundation and setup, and a home built before June 15, 1976 needs a Washington Department of Labor and Industries alteration permit before it is submitted to the county¹³. An owner working on their own property can qualify for a contractor-registration exemption, but not when acting as a contractor to sell, demolish or lease the property¹¹. That exemption is about contractor registration, not permission to bypass county permits or inspections.

Who issues building permits in Chelan County, and how do you reach them?

Chelan County Community Development's Building Division handles the county building-permit process². Reach the office at (509) 667-6225, at 316 Washington Street, Suite 301 in Wenatchee¹⁴. Building permits are accepted from 8 a.m. to 4 p.m.¹⁴. Published fees vary by application, and residential structures are priced from the applicable fee schedule or valuation chart¹⁵. During construction, inspections must be requested 24 hours ahead and by 4 p.m.; provide the permit number, address, inspection type, requested date, name and callback number¹⁶. Schedule through the inspection line at 509-667-6635¹⁷. Current Planning handles land development, subdivisions, zoning and shoreline permits, including county-adopted city codes in named urban growth areas¹⁸.

Does Chelan County, Washington have zoning?

Yes. Chelan County administers zoning in unincorporated areas, and even permit-exempt accessory structures must meet zoning setbacks³. In RR5, the minimum lot is 5 acres; in RR2.5, it is 2.5 acres, with specified exceptions and measurements to adjoining public-right-of-way centerlines⁹¹⁹. Both rural districts generally require 25-foot front, 20-foot rear and 5-foot side setbacks; the front setback becomes 55 feet from the street centerline when that is greater, and agricultural, shoreline, riparian or other code provisions can change the result⁸²⁰. Peshastin UGA residential setbacks vary by district: R-1 is 25/20/5 feet front/rear/side, while R-2 and R-3 are 20/15/5 feet²¹. In Manson UGA, UR1, UR2 and UR3 minimum lots are 10,000, 6,000 and 5,000 square feet, subject to listed location and multi-unit exceptions; their setbacks are 25/20/5, 20/20/5 and 10/20/5 feet²²²³. Subdivision applications in unincorporated Chelan County go through Current Planning, with fees that vary by application type and add a per-lot charge for major subdivisions.²⁴ Ask Current Planning to verify the parcel's district and overlays before designing.

How do septic permits work in Chelan County, Washington?

The Chelan-Douglas Health District handles on-site sewage review and permits in Chelan County and requires licensed people for septic-system work⁴. Its On-Site Septic Program, at 200 Valley Mall Parkway in East Wenatchee and (509) 886-6400, issues septic permits and inspects final installations⁵. A septic permit is required for new construction, installation, repair, modification, connection, expansion or remediation of an on-site system¹⁰. Request the final inspection at least two business days ahead and complete the as-built form before the inspection, submitting it with the request or at the inspection²⁵. Site feasibility matters: only about 1.2% of county soils are rated free of severe limits for a conventional drain field, and about 5.5% of county land has a slope of 15% or less²⁶²⁷. Treat septic suitability as an early contingency, not something to solve after house plans are finished.

Can you live in an RV or tiny home on your land in Chelan County, Washington?

Chelan County allows tiny houses built on-site as permanent dwellings under the Washington State Residential Code; a tiny house on wheels built off-site must be approved by Washington Labor and Industries as a factory-assembled structure⁶. A true park model RV may serve as a permanent dwelling only with a county placement permit, ANSI A119.5 certification, a Washington Labor and Industries insignia, a permanent foundation and approved utilities⁷. That park-model rule does not answer whether an ordinary travel trailer may be occupied temporarily or full-time on private land. Chelan County's temporary-camping rule could not be confirmed, so ask Current Planning about the parcel and proposed duration¹⁸. Under the building code, each habitable room in a dwelling, tiny houses included, needs at least 70 square feet of floor area and a 7-foot minimum dimension, and one common room can serve for living, sleeping, dining and cooking.²⁸ County zoning still controls siting and setbacks in unincorporated areas³.

How do you build a home in Chelan County, Washington, step by step?

1. Ask Current Planning to confirm the parcel's zoning district, lot-size standard, setbacks, allowed dwelling type and any urban-growth-area rules¹⁸³.
2. Establish water and wastewater feasibility. The Health District permits septic work; qualifying groundwater uses may be exempt from a state water-right permit, but larger withdrawals require one¹⁰¹².
3. Resolve access with Public Works before constructing an approach to a county road²⁹³⁰.
4. Submit plans to the Building Division for intake and plan review, and use the published fee schedule or valuation chart to budget the permit²¹⁵.
5. Obtain a county Floodplain Development Permit if the proposal is in a floodplain³¹.
6. Schedule required construction inspections 24 hours ahead and before the daily 4 p.m. cutoff¹⁶.

What should you check before buying land in Chelan County, Washington?

Start with buildability. Only about 5.5% of Chelan County land has a slope of 15% or less, and only about 1.2% of soils are rated free of severe limits for conventional septic drain fields²⁷²⁶. Confirm legal access, zoning, septic area, water source and floodplain status before closing. A qualifying single or group domestic groundwater use of no more than 5,000 gallons per day may be exempt from the state appropriation permit, as may stock water and a lawn or noncommercial garden of no more than 0.5 acre; uses outside the exemptions require a permit¹². Floodplain development requires a county permit³¹. A county-road approach needs county permission, while a connection on a state-highway right-of-way needs written permission from the Washington Department of Transportation³⁰³². If you plan to rent the home short term, unincorporated Chelan County requires an annual short-term rental land use permit before you advertise or operate, and permits expire each December 31.³³

Watch-outs

• The owner-builder and agricultural exemptions concern contractor registration; neither fact establishes an exemption from building permits, zoning or inspections¹¹³⁴.
• RR5, RR2.5, Peshastin UGA and Manson UGA standards are district-specific, and agricultural, shoreline, riparian, corner-lot or other code provisions can alter the listed setbacks^8202123.
• Chelan County's permanent-dwelling rule covers qualifying park model RVs, but temporary camping and ordinary travel-trailer occupancy could not be confirmed; ask Current Planning before relying on an RV for housing⁷¹⁸.
• A municipal water or sewer promise for a subdivision must be documented in writing for each lot, and unfinished utility improvements can require financial security before final plat approval³⁵.

Sources

1. Building, quoted and re-checked
2. Building, quoted and re-checked
3. co.chelan.wa.us, quoted and re-checked
4. Service Providers & Licensed Designers, quoted and re-checked
5. Chelan-Douglas Health District, On-Site Septic Program (cdhd.wa.gov)
6. co.chelan.wa.us, quoted and re-checked
7. co.chelan.wa.us, quoted and re-checked
8. Chapter 11.12 Rural Residential/Resource – 1 Dwelling Unit Per 5 Acres (RR5), quoted and re-checked
9. Chapter 11.12 Rural Residential/Resource – 1 Dwelling Unit Per 5 Acres (RR5), quoted and re-checked
10. Service Providers & Licensed Designers, quoted and re-checked
11. RCW 18.27.090 Exemptions, quoted and re-checked
12. Land Use — Water Rights, quoted and re-checked
13. Building Division Frequently Asked Questions, quoted and re-checked
14. Chelan County Community Development - Building Division (co.chelan.wa.us)
15. Community Development Fee Schedule, quoted and re-checked
16. Building, quoted and re-checked
17. Chelan County Community Development - Building Division (programs & inspection line) (co.chelan.wa.us)
18. Chelan County Community Development - Current Planning Division (co.chelan.wa.us)
19. Chapter 11.14 Rural Residential/Resource – 1 Dwelling Unit Per 2.5 Acres (RR2.5), quoted and re-checked
20. Chapter 11.14 Rural Residential/Resource – 1 Dwelling Unit Per 2.5 Acres (RR2.5), quoted and re-checked
21. Chapter 11.22 Peshastin Urban Growth Area, quoted and re-checked
22. Chapter 11.23 Manson Urban Growth Area, quoted and re-checked
23. Chapter 11.23 Manson Urban Growth Area, quoted and re-checked
24. Community Development Fee Schedule, quoted and re-checked
25. cdhd.wa.gov, quoted and re-checked
26. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
27. Share of land at 15% slope or less: Bolthole Index county data
28. Community Development Interpretation No. 2021-001: Accessory Structures, Dwelling Units and Certificates of Occupancy, quoted and re-checked
29. Chelan County Public Works - Development Review (co.chelan.wa.us)
30. RCW 36.75.130 — Approaches to county roads—Rules regarding construction—Penalty (Washington statewide rule), quoted and re-checked
31. Building, quoted and re-checked
32. RCW 47.32.150 — Approach roads, other appurtenances—Permit (Washington statewide rule), quoted and re-checked
33. 2025 Short-Term Rental Code with Newly Adopted Sections, quoted and re-checked
34. RCW 18.27.090 Exemptions, quoted and re-checked
35. cdhd.wa.gov, quoted and re-checked

Written October 9, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.