Washington landscape contractor registration: bond, insurance, specialties and the PL03 question

A Washington landscaper doesn't sit an exam to register. The Department of Labor and Industries (L&I) asks for a bond, a liability policy, a notarized form and a fee, and calls the result registration, not a license. The law also takes the $500 small-job exemption away from anyone who advertises as a contractor. The state registers 63 specialties, and three of them describe a landscape company's core work. We read everything below on L&I's website and in the state's RCW and WAC on October 1, 2026.

Registration needs a bond, a policy and a notarized form

To register, per L&I's contractor page, you register the business with the Department of Revenue, buy a continuous surety bond (or assign a savings account), buy a general liability policy and file an application with original, notarized signatures. The bond is $15,000 for a specialty contractor and $30,000 for a general contractor, which RCW 18.27.040 confirms. The policy is $200,000 public liability with $50,000 property damage, or $250,000 combined, and L&I must be named as certificate holder. The application and renewal fee is $150.20, a reinstatement after suspension is $70.90, and the registration is valid for two years.

A cancelled bond or policy suspends the registration automatically. Residential jobs of $1,000 or more need a model disclosure notice to the customer, and the registration number goes on every ad, bid and estimate. If you have employees, the application also asks for your workers' compensation account number, under RCW 18.27.030.

Landscaping, irrigation and tree removal are three specialties

L&I's specialty definitions are written for registration only. The Landscaping specialty constructs, maintains, repairs, installs and develops landscape systems, treats and installs topsoil, hydroseeds, plants decorative vegetation, and builds walkways, decorative decks, garden walls and fences up to six feet. It includes residential lawn sprinklers without pumps, ponds and water features. Irrigation sprinkler systems is its own specialty, covering installing, repairing and maintaining systems, with potable water connections and backflow devices for nonpotable water allowed only as an integral part of the system and outside a building. Tree removal is a third, covering felling and removing trees, stumps and branches near a structure or fence.

A specialty contractor can only do work in its specialty. L&I says specialty contractors cannot hire subcontractors, though the definition in RCW 18.27.010 lets them subcontract work that is incidental to the specialty. A general contractor, one who uses more than one trade on a job, can. Using or subcontracting to an unregistered contractor is itself a gross misdemeanor.

The $500 exemption ends the day you advertise

RCW 18.27.090 exempts work on one project with an aggregate price under $500, labor and materials included, as casual, minor or inconsequential. It doesn't apply if the job is part of a larger operation, or was split into smaller contracts to avoid registration. And it doesn't apply to anyone who puts out a sign, card or other device suggesting they are a contractor. A flyer reading "landscaping contractor" ends the exemption for every job, including the $300 ones. Employees working for wages for a registered contractor are exempt too, and so are people working on their own property, unless they do it to sell, demolish or lease it.

L&I's consumer pages say a lawn maintenance company can mow and prune

L&I's Protect My Home page says a lawn maintenance company can mow and prune, and that installing a new garden feature or sprinkler system takes a registered landscaper or general contractor. L&I's Hiring a Contractor flyer lists pruning or lawn care among the services that do not require registration, next to gutter cleaning and window washing. Both are consumer guidance, not the statute or the WAC.

The statute defines a contractor as someone who undertakes to construct, alter, repair or improve a structure, project or improvement attached to real estate, and adds tree removal by name. The Landscaping specialty's definition uses the word maintains, and none of the pages we read says where mulch, replacement planting or edging falls between mowing and installing. L&I's small business guide puts businesses that manage or consult on construction or landscaping projects in the group that generally needs registration, and tells you to email or call when unsure. Put this question to L&I at ContReg@Lni.wa.gov or 1-800-647-0982: does a mowing route that also does seasonal mulch and small replanting need contractor registration?

The PL03 question: pumps need a plumber, sprinkler pipe is unclear

L&I's plumber certification page has a line every sprinkler installer should read: certification is not needed to install plumbing outside a building, except for domestic pump and pump and irrigation systems. The Pump and irrigation specialty plumber (PL03) works on equipment used to acquire, treat, store or move water for drinking or irrigation, and it takes 4,000 hours in the specialty under a certified plumber plus electrical certification.

The Landscaping specialty's own definition adds that work in it may also need plumber certification under chapter 18.106 RCW, without saying which work. Two other texts narrow what that means. The plumbing statute defines plumbing as work on potable water and waste systems within a building. The registration definition of the sprinkler specialty says pumps used to draw or boost pressure on a residential sprinkler system need plumber certification. So pumps are covered, and the pipe and heads of a zone go unmentioned. Backflow is a separate path: the Backflow specialty plumber (PL30) is limited to repairing existing assemblies inside buildings and requires a Washington Department of Health tester certification. Plumbers@Lni.wa.gov or 360-902-5207 can say which side of the line a given install falls on.

Skipping registration costs $1,200 or more per worksite per day

Advertising, bidding or working as an unregistered contractor is a gross misdemeanor and an infraction, and each day and each worksite counts as a separate infraction. The infraction fine for failure to register is $1,200 to $10,000. L&I may cut it to no less than $600 for a first offense if you register within 10 days of the notice.

The policy minimum is $200,000, and a cancelled policy ends the registration

The $200,000 and $50,000 limits are the minimum to register. Anyone hiring you can write higher limits into the contract, and the certificate of insurance guide shows what that request looks like. Installs and sprinkler work sit on a policy differently from maintenance, as the landscaping insurance page explains, and the general liability guide covers the maintenance side. Employees add workers' comp to the list, and the application asks for your L&I account number. If you spray, the state's Department of Agriculture license is a separate one. A policy that cancels takes the registration with it.