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Benton County, WA Building Safety: Building Permits (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

Key Facts

Governing section
BCC 3.04.018
Statutory basis
RCW 19.27.095
Permit validity
2 years from issuance
Extension fee
25% of original permit fee
First violation penalty
Up to $500 civil penalty
Administering agency
Benton County Building Department

Summary

Benton County requires a fully complete building permit application under BCC 3.04.018, tracking RCW 19.27.095, before the Building Department will process a project in unincorporated territory. The application must bundle SEPA review, land-use approvals, septic/sewer proof, water availability and stamped construction drawings together.

City-specific rules exist: Kennewick has its own building permits rules that differ from Benton County's county-level regulations. If you live in Kennewick, check the city-specific page instead.

3.04.018 COMPLETED BUILDING PERMIT APPLICATION. Pursuant to RCW 19.27.095, a fully complete building permit application shall consist of the following: Table 3.04-1. Elements for a Complete Building Permit Application... Conditional Use and Shoreline Substantial Development Permit Applications. These and all other land use permits required by the Benton County Code for the project shall be applied for prior to or with the building permit application... Building Permit Application Form. All required information in the application form must be completed in full.

Full Breakdown

018, adopted under Ord. 602 (2018) and amended by Ord. 04 and the adopted International Building Codes; and, where a road approach onto a public road is needed, conditional approval to construct it. 034. 039; a written extension request filed before expiration and paid at 25 percent of the original fee buys one additional year, with only one extension allowed per permit and no work permitted after expiration without an entirely new permit and full fee. 070.

Violations & Fines

Working without a required permit or violating any provision of BCC Chapter 3.04 draws a civil penalty of up to $500 for a first offense plus court costs and restitution under BCC 3.04.065(a); a second or later violation of the same provision is a misdemeanor under BCC 3.04.065(b). The county may also seek injunctive relief under BCC 3.04.080 to stop unpermitted work.

Frequently Asked Questions

What must a Benton County building permit application include?
Under BCC 3.04.018, a complete application needs a SEPA checklist (unless exempt), any required conditional-use or shoreline permit, a completed application form, proof of septic or sewer approval, evidence of adequate water availability, a full site plan, stamped construction drawings, and road-approach approval if access to a public road requires it.
How long does a Benton County building permit last?
A permit expires two years from the date of issuance under Section 105.5.1, added by BCC 3.04.039. One extension of up to one year is available if requested in writing before expiration and paid at 25 percent of the original permit fee; no further extensions are allowed.
Who reviews and issues building permits in unincorporated Benton County?
The Benton County Building Department, headed by the Building Official appointed by the Board of County Commissioners, administers building permitting under BCC 3.04.070, including plan review and inspections tied to the adopted International Building and Residential Codes.
What happens if I build without a permit in Benton County?
A first violation of BCC Chapter 3.04 carries a civil penalty of up to $500 plus court costs and restitution; a repeat violation of the same provision becomes a misdemeanor, and the county can seek a court injunction to stop the work under BCC 3.04.080.

Sources & Official References

Other rules in Benton County

All Benton County rules

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