Kirkland's Landscaping Rules: The Rules That Matter

Every city handles landscaping rules a little differently. In Kirkland, Washington, there are 7 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Rainwater Harvesting

Rainwater harvesting is legal in Kirkland for outdoor irrigation under WA Ecology Policy 1017; residential potable use requires a plumbing permit and treatment under state rules.

Key details: Legal: Yes, rooftop collection. Basis: Ecology Policy 1017. Typical Use: Irrigation, vehicle wash. Potable Use: Needs plumbing permit. Rebates: Via RainWise/County grants.

Illegal non-roof rainwater harvesting or unpermitted large-scale systems can be referred to WA Department of Ecology; plumbing code violations handled through Kirkland Building Division.

If you are coming from a city with tighter rules, you will find Kirkland gives residents more flexibility on rainwater harvesting.

Water Restrictions

During a declared water shortage, Kirkland's public works director can forbid, restrict, or ration irrigation and other water uses citywide or for specific customer classes under KMC 15.16.040. Violators face daily surcharges and, on repeat offenses, a flow restrictor or shutoff.

Key details: Governing section: KMC 15.16.040. Trigger: Declared water shortage. Who can restrict: Director of public works. Restricted uses: Irrigation, cooling, other uses. Penalty: Per-day surcharge, KMC 5.74.040 rate.

A first documented violation of active irrigation restrictions draws a written notice to the service address; further violations trigger a per-day surcharge under KMC 15.16.045 at the rate set in KMC 5.74.040, billed with the regular water charges. Repeat or continuing violations let the director of public works install a flow-restricting device or terminate water service under KMC 15.16.047.

This is not one of those rules that cities tend to ignore. Kirkland actively enforces its water restrictions requirements.

Native Plants

Kirkland's zoning code requires supplemental landscaping on developed lots to reach 80 percent living-plant coverage within two years and gives explicit preference to native plant species drawn from the City's own Native Tree/Plant Lists.

Key details: Coverage standard: 80% living plant coverage within 2 years. Tree density: 1 tree per 1,000 sq ft landscaped. Deciduous tree minimum: 2-inch caliper at planting. Coniferous tree minimum: 6 feet tall at planting. Plant source: Kirkland Native Tree/Plant Lists preferred.

Failing to meet the 80-percent coverage standard, substituting non-hardy material that will not spread, or skipping the required landscape plan is a zoning code violation enforceable by the Planning and Building Department through standard code enforcement channels, which can hold up final building inspection or certificate of occupancy until the landscaping is brought into compliance.

Tree Removal & Heritage Trees

Kirkland lets owners of developed property remove two to four regulated trees a year without a permit, scaled to lot size, as long as they first file a tree removal notification form. Removing more, cutting a landmark tree, or clearing protected or previously required trees needs a full tree removal permit under KZC 95.25.

Key details: No-permit allowance: 2-4 trees per year by lot size. Lot size tiers: 10,000 sq ft and 20,000 sq ft breakpoints. Permit trigger: Removal beyond Table 95.25.1 allowance. Development hold: 12 months, 24 for landmark trees. Governing section: KZC 95.25.

Removing a regulated tree from private property without first filing the notification form, or beyond the Table 95.25.1 allowance without a permit, is enforced by Kirkland's Planning and Building Department under Chapter 95's enforcement provisions (KZC 95.55), which can include fines and mandated tree replacement. An unpermitted removal also triggers the 12- or 24-month development-permit hold under KZC 95.25(5), delaying any building or subdivision application on that lot.

Tree Trimming

Kirkland puts street trees in the public right-of-way under city control: adjacent property owners must water and mulch them and may trim branches up to 1.5 inches in diameter for sidewalk clearance, but anything larger needs a public tree pruning permit under KZC 95.20.

Key details: No-permit sidewalk pruning: Up to 1.5-inch diameter branches. Permit required: Pruning branches over 1.5 inches. Pruning standard: ANSI A300; topping prohibited. Max crown removal: 25% of live crown per event. Governing section: KZC 95.20.

Pruning a street tree beyond the 1.5-inch sidewalk-clearance exception without a public tree pruning permit, or topping a public tree, is enforced by Kirkland's Planning and Building Department under Chapter 95's enforcement provisions (KZC 95.55), which can impose fines and require restorative pruning or replacement. Damage from prohibited topping or over-pruning can also convert the incident into an unpermitted tree removal under the KZC 95.10 definition.

Weed Ordinances

Kirkland's Property Maintenance Code bans weeds and grass over eighteen inches tall on any premises or exterior property in the city. Code enforcement can enter under a warrant, cut the overgrown vegetation, and bill the owner for the cost. The rule sits in KMC 21.41.302 alongside a duty to clear vegetation blocking sidewalks or posing a fire hazard.

Key details: Max height: 18 inches. Governing section: KMC 21.41.302(d)(2). City abatement: City may cut and bill owner. Civil fine: $100-$500 per day, up to $50,000. Appeal window: 21 calendar days.

Ignoring a weed-height notice draws a civil fine under KMC 1.12.045: $100 per day for the first fifteen days, $250 per day through day thirty, and $500 per day after that, capped at $50,000 per violation. The city can also send its own crew to cut the weeds and bill the owner for the cost. Fines do not replace the duty to correct the violation, and owners get 21 days to appeal to the hearing examiner.

Artificial Turf

Kirkland allows artificial turf in yards and counts it toward the lot coverage exemptions list under KZC 115.90(2)(g), but installation cannot conflict with tree retention, critical area buffers, protected natural areas or shoreline riparian rules. No separate turf permit exists; compliance is folded into the underlying vegetation and critical area code.

Key details: Turf allowed in yards: yes, no area cap set. Lot coverage treatment: exempt under KZC 115.90(2)(g). Restriction: cannot conflict with tree/critical area rules. Stormwater guidance: listed as discouraged surface. Separate turf permit: none; reviewed under other chapters.

Installing artificial turf that damages a regulated tree's protected root zone, encroaches into a critical area buffer, or violates shoreline riparian requirements is enforced as a violation of the underlying chapter, not KZC 115.90 itself: tree violations carry fines under Table 1.12.100 of Chapter 1.12 KMC based on trunk diameter, and critical area violations can draw civil fines up to $25,000 plus restoration costs.

The rules around artificial turf in Kirkland lean permissive, but that does not mean anything goes.

The Bottom Line

Compared to many U.S. cities, Kirkland gives residents more room on landscaping rules. 2 of the 7 rules here are rated permissive. But permissive does not mean unregulated. There are still requirements, and the city does enforce them when violations are reported.

All of the above reflects Kirkland's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.