Before You Build in Kennewick, WA: Permit & Rule Checklist (2026)

Under Kennewick Municipal Code Chapter 18.27 (Accessory Buildings, Structures and Uses), fences in residential zones are limited to 36 inches in a required front yard, 30 inches within a sight-distance triangle, and 6 feet above grade elsewhere on the site. Fences over 36 inches must be built with steel or pressure-treated wood posts, and over-height fences require a variance.

Pool barriers in Kennewick are governed by the International Swimming Pool and Spa Code and IBC Appendix G, both adopted by reference in the Washington State Building Code at WAC 51-50, and implemented locally through Kennewick Municipal Code Chapter 15.44 (Swimming Pool Code). A residential pool barrier must be at least 48 inches high, climb-resistant, with self-closing/self-latching gates and openings small enough that a 4-inch sphere cannot pass.

Most residential fences six feet or less in height in Kennewick do not require a separate building permit under WAC 51-50 (the adopted Washington State Building Code, IBC Section 105.2 exemption), but all fences must comply with the zoning, sight-triangle, and material standards in Kennewick Municipal Code Chapter 18.27. Pool barriers and over-height fences do require a permit.

Boundary, partition-fence, and 'spite fence' disputes in Kennewick are governed by Washington State common law and statute, not the city zoning code. RCW Chapter 16.60 addresses livestock/partition fence cost-sharing in rural areas, and Washington recognizes the common-law spite-fence doctrine as a private nuisance. Kennewick Municipal Code Chapter 18.27 sets height and location but does not resolve private boundary disputes.

Kennewick Municipal Code Chapter 18.27 does not prescribe a closed list of permitted fence materials, but requires that all fences over 36 inches use steel or pressure-treated wood posts. Barbed wire, electric, and razor wire are generally prohibited in residential zones. Standard materials - wood, vinyl, aluminum, ornamental iron, chain link - are permitted subject to the height and 'good side out' rules.

Residential pool fencing in Kennewick must meet IBC Appendix G and ISPSC Section 305 as adopted into the Washington State Building Code at WAC 51-50, and enforced locally through KMC Chapter 15.44. A 48-inch minimum barrier, self-closing/self-latching gates opening away from the pool, no climbable horizontal members on the outside, and house-wall openings protected by an alarm or self-closing device are all required.

All swimming pools in Kennewick - in-ground, above-ground, and storable pools capable of holding water 24 inches or deeper - require a building permit under Kennewick Municipal Code Chapter 15.44 and the Washington State Building Code (WAC 51-50). The permit covers electrical bonding under NEC Article 680, barrier compliance under IBC Appendix G, setbacks under KMC Chapter 18.27, and final inspection.

Pool safety in Kennewick is governed by a layered set of standards: the federal Virginia Graeme Baker Pool and Spa Safety Act (15 USC 8003) for anti-entrapment drain covers on public pools and spas; Washington's water recreation facility rules at WAC 246-260 under RCW 70.90 for public/semi-public pools; NEC Article 680 and WAC 296-46B-680 for electrical bonding and GFCI; and IBC Appendix G / ISPSC via WAC 51-50 for residential barriers and door alarms.

Kennewick (Benton County, population approximately 84,000) is a Washington city subject to the state's 2023 ADU preemption statute, House Bill 1337 codified at RCW 36.70A.680 through RCW 36.70A.700. Because Kennewick exceeds the 25,000-population threshold and lies within a fully-planning GMA county (Benton County), it must permit two accessory dwelling units (ADUs) per lot in all areas zoned predominantly for residential use. Local detail is implemented through Title 18 of the Kennewick Municipal Code (Zoning), hosted on Code Publishing at https://www.codepublishing.com/WA/Kennewick/.

Converting a Kennewick garage into habitable space requires both (1) zoning approval under KMC Title 18 for the change of use, since the converted area no longer functions as accessory parking and may trigger off-street parking minimums or ADU classification under HB 1337; and (2) a building permit under the Washington State Building Code at WAC 51-51 (2021 IRC). Conversions must meet IRC Chapter 3 requirements for habitable space including R310 emergency escape and rescue openings, R305 ceiling height, R314 smoke alarms, and R315 carbon monoxide alarms. RCW 19.27.180 governs residential sprinkler requirements; one- and two-family dwellings are generally exempt from automatic sprinkler retrofit on conversion.

Sheds in Kennewick are regulated through two layers: (1) Kennewick Municipal Code Title 18 (Zoning) setting accessory-structure dimensional standards by district — typically rear-yard location, district-specific setbacks, and a maximum height around 15 feet; and (2) the Washington State Building Code at WAC 51-51, adopting the 2021 International Residential Code, which under IRC R105.2 exempts one-story detached accessory structures of 200 square feet or less from building permit requirements but does not waive zoning compliance. A zoning permit from the Kennewick Planning Division is generally still required even when a building permit is not.

Recreational fires in Kennewick, WA (Benton County, population approximately 84,000) are regulated by the Washington State Fire Code (WAC 51-54A, which adopts the 2021 International Fire Code) as enforced locally under Kennewick Municipal Code (KMC) Chapter 15.30 (Fire Prevention Code), together with the Benton Clean Air Agency (BCAA) outdoor-burning rules under WAC 173-425. BCAA limits a recreational fire inside Kennewick city limits to 3 feet by 3 feet by 2 feet tall, fueled only by dry, seasoned firewood, set back at least 50 feet from any structure, and continuously attended. A recreational fire may not be used to dispose of yard debris.

Residential yard-debris burning is banned year-round inside Kennewick city limits. The Benton Clean Air Agency (BCAA) administers outdoor-burning rules under the Washington Clean Air Act (Chapter 70A.15 RCW) and WAC 173-425. Inside Kennewick (and the surrounding urban growth area), WAC 173-425-040 prohibits residential burning of leaves, grass, brush, garbage, and similar yard debris. Only recreational fires under IFC Section 307.4, gas barbecues, and approved tumbleweed burns (with a BCAA burn-line call) are allowed.

Kennewick requires adjacent property owners to trim vegetation that obstructs traffic signs, signals, intersections, or the public right-of-way. The city's sight-obstruction guidance places the duty on the abutting owner, backed by KMC 9.48 nuisance authority and RCW 7.48 public-nuisance law.

Most outdoor irrigation in Kennewick runs on Kennewick Irrigation District water, not city potable water. KID activates a mandatory address-based watering schedule during declared droughts under its junior Yakima River water rights, which are governed by RCW 90.03.

Kennewick does not require a city permit to remove a tree on private property, with three exceptions: trees in the public right-of-way, trees inside an approved KMC 18.21 landscape plan for development, and trees inside a critical area under KMC 18.58.