Building permits, zoning and septic rules in Ellensburg, Washington

At a glance

Residential building permits

Required unless specifically exempted; apply through the city¹⁶

Zoning

City zoning applies; district determines development standards³⁷

Septic systems

Kittitas County Public Health: site evaluation, design and installation permit⁴⁸

RV living

Primary residences allowed in manufactured-home parks with required services and utilities⁵

Manufactured homes

Designated manufactured homes allowed where single-family residences are allowed, subject to city criteria⁹

Owner-builder

Conditional state contractor-registration exemption; other approvals still apply¹⁰

Tiny houses

State building-code requirements apply; city location and installation approval still needed¹¹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Do you need a building permit in Ellensburg, WA?

Ellensburg requires a building permit for all residential projects unless specifically exempted, according to the city’s residential submittal bulletin.¹ The bulletin calls for a completed, signed building application and/or mechanical application, construction documents sufficient to verify code compliance, and a site plan showing structures, lot-line distances, utilities, easements and floodplain features.¹ A permit deposit is required at submission and is based on project valuation and plan review.¹

Washington’s owner-builder exemption concerns contractor registration, with limits for work intended for sale, demolition or lease; the exemption does not remove building, electrical, plumbing, land-use or inspection requirements.¹⁰

Who issues building permits in Ellensburg, and how do you apply?

The Ellensburg Building Division is the city contact for residential building applications and general building-permit questions.² Ellensburg’s application page identifies email, the SMARTGov portal, mail after contacting the Building Department, and in-person submission as application methods.⁶ Use the Building Division’s linked online permitting and inspection portal to reach the city’s online service.²

Ellensburg’s updated building-permit and land-use review fee schedule applies to applications submitted on or after March 23, 2026.¹² Ask the Building Division for the current project-specific deposit and fee calculation; the residential bulletin ties the deposit to valuation and plan review.¹

Does Ellensburg have zoning, lot-size and setback rules?

Ellensburg has its own zoning inside city limits, and permitted uses and dimensional standards depend on the zoning district.³ Identify the parcel’s district on the city zoning map before assessing a proposed dwelling or land division.⁷ The city Planning Division is the contact for general planning questions and planning applications, including pre-application submissions.¹³

A designated manufactured home is allowed in Ellensburg districts that allow single-family residences when the home meets the city’s stated criteria.⁹ Ask Planning for the parcel’s applicable lot-size, setback and use standards rather than relying on a citywide minimum.³ Outside city limits, Kittitas County administers zoning for unincorporated land, including joint review provisions in the Ellensburg Urban Growth Area.¹⁴

How do septic permits work inside Ellensburg?

Kittitas County Public Health handles on-site sewage systems in Kittitas County, including site evaluation and design review.⁴ For an Ellensburg parcel needing septic, the county process starts with a site evaluation and approved design before an installation permit; homeowners preparing their own design must first meet with an Environmental Health Specialist.⁸⁴ The installation permit is valid for 1 year, with renewal available if requested before expiration.⁸

An installed system needs final inspection, and the drain field must remain uncovered until that inspection.¹⁵ Before commissioning a septic design, ask city Public Works about sewer service and new or altered connection requirements.¹⁶ Washington law allows or requires sewer connection in specified circumstances, including new development when required by applicable development regulations.¹⁷

Can you live in an RV or tiny home in Ellensburg?

Ellensburg permits an RV as a primary residence within a manufactured-home park when the required service and utility provisions are met.⁵ The manufactured-home-park permission does not establish a right to occupy an RV on an ordinary private lot.⁵ We could not confirm Ellensburg’s rule for living in an RV on a private lot while building; ask the city Planning Division about the proposed address and use.¹³

Washington’s tiny-house guidance requires compliance with the state building code and local building-department requirements for foundation, installation and location.¹¹ Ask Ellensburg Planning about the proposed residential use and the Building Division about construction approval before buying a tiny house for the parcel.³²

What are the steps to build a home in Ellensburg?

1. Identify the Ellensburg parcel’s zoning district and ask city Planning about the proposed use and applicable development standards.⁷³
2. Contact city Public Works about new or altered sewer and water service; if septic is needed, start with Kittitas County Public Health’s site evaluation and design process.¹⁶⁴
3. Address floodplain review before altering land or starting a new use in a frequently flooded area; Ellensburg incorporates that review into the underlying project approvals.¹⁸
4. Prepare the residential application, construction documents and site plan, and arrange the permit deposit with the Building Division.¹
5. Submit through a city application method and ask the Building Division for the project’s inspection and occupancy requirements before scheduling work or moving in.⁶²

Watch-outs

• Ellensburg’s RV primary-residence permission is specific to manufactured-home parks and required services and utilities.⁵
• Ellensburg floodplain approval can apply to land alteration or a new use, not just construction of a house.¹⁸
• A Kittitas County septic design approval precedes the installation permit; request the installation permit when ready to install.⁸
• We could not confirm Ellensburg’s certificate-of-occupancy provision; ask the city Building Division what approval is needed before moving in.²

Sources

1. City of Ellensburg Building Division — Residential Applications (ci.ellensburg.wa.us)
2. City of Ellensburg Building Division (ci.ellensburg.wa.us)
3. ECC 15.100.010—How to use this code (Ellensburg), quoted and re-checked
4. Environmental Health Programs - On-site Sewage, quoted and re-checked
5. ECC 15.340.040—Manufactured home park (Ellensburg), quoted and re-checked
6. Building Permit Submittal Requirements (Ellensburg), quoted and re-checked
7. ECC 15.100.010—How to use this code (Ellensburg), quoted and re-checked
8. Kittitas County Public Health — Liquid Waste, quoted and re-checked
9. ECC 15.340.030—Manufactured homes (Ellensburg), quoted and re-checked
10. RCW 18.27.090 — Exemptions (Washington statewide rule), quoted and re-checked
11. Tiny Houses (Washington statewide rule), quoted and re-checked
12. City of Ellensburg Building Division (Ellensburg), quoted and re-checked
13. City of Ellensburg Planning Division (ci.ellensburg.wa.us)
14. Kittitas County Code Title 17 Zoning, quoted and re-checked
15. Kittitas County Public Health — Liquid Waste, quoted and re-checked
16. City of Ellensburg Public Works — Water and Sewer Service (ci.ellensburg.wa.us)
17. WAC 246-272A-0025 — Connection to public sewer system (Washington statewide rule), quoted and re-checked
18. City of Ellensburg 2024 Land Development Code Updates—SEPA Exhibits (Ellensburg), quoted and re-checked

Written October 11, 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.