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Kennewick, WA Building Setbacks & Zoning: Lot Coverage Limits (2026)

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

Key Facts

Most commercial/industrial zones
No coverage cap ('None')
BP (Business Park)
50% max coverage
HMU district
.45 floor area ratio
Residential zones
No separate coverage figure

Summary

Kennewick's Table of Non-Residential Site Development Standards sets no blanket lot coverage cap for most commercial and industrial zones; Business Park (BP) is capped at 50 percent, and the Historic Mixed-Use (HMU) district instead limits floor area ratio to .45, per KMC 18.12.010(B)(2).

Table of Non-Residential Site Development Standards -- Maximum Lot Coverage: None (UMU, CN, CO, CBD, CC, CR, CAR, CG, CM, IP, IL, IH, JF, PF, OS); BP - Business Park District: 50%; HMU - Historic, Mixed-Use District: See (5.a) Below -- footnote (5)(a): 'Floor area ratio (the amount of building surface expressed as a ratio to lot surface) is a maximum of .45.'

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 19 Update 2).

Full Breakdown

For UMU, CN, CO, CBD, CC, CR, CAR, CG, CM, IP, IL, IH, JF, PF and OS zoning districts, the Maximum Lot Coverage column reads 'None': coverage isn't numerically capped, though yard, setback and open-space requirements still constrain footprint. The Business Park (BP) district is the one exception with a stated 50 percent maximum lot coverage. The Historic, Mixed-Use (HMU) district uses a floor area ratio of .45 instead of a lot-coverage percentage. The residential site development table (KMC 18.12.010(A)(2)) carries no separate lot-coverage row at all; residential building footprint is controlled indirectly through required yard setbacks.

Violations & Fines

Exceeding the 50 percent lot coverage cap in the Business Park district, or the .45 floor area ratio in HMU, without an approved site plan revision is a zoning violation subject to Planning Division enforcement.

Frequently Asked Questions

Does Kennewick cap lot coverage in residential zones?
The zoning table sets no separate maximum lot coverage figure for residential districts; footprint is controlled indirectly through required yard setbacks under KMC 18.12.010(A)(2).
Which zone actually has a lot coverage cap?
Business Park (BP) is capped at 50 percent; the Historic Mixed-Use (HMU) district uses a .45 floor area ratio instead, per KMC 18.12.010(B)(2).

Sources & Official References

Other rules in Kennewick

Parking Rules: Street Parking LimitsSome RestrictionsSetback RulesSome RestrictionsStructure Height LimitsSome RestrictionsParking Rules: Commercial & Oversized VehiclesSome RestrictionsFence Regulations: Material RestrictionsSome RestrictionsAnimal Ordinances: Exotic PetsHeavy RestrictionsAnimal Ordinances: Pet LimitsSome RestrictionsLandscaping Rules: Tree TrimmingSome Restrictions

All Kennewick rules

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