Tree trimming in Seattle, Washington

Pruning rules and permits in Seattle

Street trees are where the rules bite. Under SMC 15.43, SDOT issues a permit to prune or remove any tree in the right-of-way. Major pruning, meaning branches 2 inches or thicker or 15% or more of the foliage, has to be done by a provider on the city’s registry.

On private property the SDCI tier rules regulate removal from 6 inches DSH, not routine pruning. Cutting so hard that the tree dies, though, can turn a trim into an unpermitted removal. If a tree may be heritage or Tier 2 (24 inches and larger), keep cuts modest and check the city’s heritage program before work starts.

Power lines and utilities in Seattle

Seattle City Light trims around its distribution and transmission lines, poles, transformers and vaults. Its targets are 10 feet of clearance for slow-growing species and 14 feet for fast-growing ones on distribution lines, with 15 feet of overhang removed; transformers get 10 feet and poles 3.

Service drops are split. The utility prunes only the first 10 feet from the distribution connection, and the rest of the line to your house, held to 3 to 5 feet of clearance, is your responsibility. Never prune near an energized line yourself; see utility rules and tree trimming.

Source: utility vegetation-management pages linked above; WAC 296-24-960 (WA L&I). Checked 2026-10-02.

What trimming costs in Seattle

Height, access and wires move a trimming bill more than anything else. Line-adjacent pruning goes slower and may need a second climber, and a registered provider is mandatory for major pruning on a street tree.

BLS lists a $33.85 mean hourly wage for tree workers in the Seattle-Tacoma-Bellevue area, on a workforce of about 310. That is pay, not a quote. The modeled range below reflects those inputs; the methodology explains how.

Modeled estimate, not quotes (method): crew-hours × $210 per crew-hour, rounded to $50.

Source: BLS Occupational Employment and Wage Statistics, May 2025, SOC 37-3013. Checked 2026-10-02.

When to trim in Seattle

Seattle’s dry window is short and predictable. The Sea-Tac station averages 0.6 inches of rain in July and 0.97 in August, against 6.31 inches in November, the wettest month. Structural pruning in summer or early fall gets weight off long limbs before the November-to-February stretch when most King County storm reports land.

The city sits in hardiness zone 9a, so most yard species keep growing slowly through mild winters. Light cleanup of dead wood can happen any month.

Month-by-month guide: best time to trim trees in the Pacific Northwest. Types of pruning: crown thinning and reduction.

What to do next

Figure out first whether the tree is in the right-of-way; if so, start with the SDOT permit. Then check the line situation, decide whether you need a registered provider, and verify the company’s license through the license lookup guide before work is scheduled.

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