Checking a Tree Contractor's License Before You Hire in Ontario, CA

To hire a tree service in Ontario, CA, check that the contractor holds an active license from the Contractors State License Board in a classification that covers tree work, confirm workers' compensation coverage, get a written estimate that lists every tree and what will be done, and ask how they handle power lines, parkway trees and cleanup. A few minutes of checking can save you from liability for an injured worker or a damaged roof.

California license rules for tree work

The Contractors State License Board licenses tree service contractors. Since January 1, 2024, the classification for tree work is the C-49 Tree and Palm Contractor, which covers planting, maintaining and removing trees and palms, including pruning, stump grinding and guying. The older C-61/D-49 Tree Service classification is no longer issued, but contractors who already held it may keep working under it. See the CSLB C-49 classification.

When a license is required

Since January 1, 2025, California law requires a license for any job of $1,000 or more in labor and materials. A license is also required for jobs under $1,000 if the work needs a permit or the person hires anyone to help. Unlicensed operators may advertise only for jobs under $1,000 and must say in the ad that they hold no license. Read the CSLB bulletin on the $1,000 rule.

How to check a license

Use the CSLB Check a License tool. Enter the license number or business name and confirm the license is active, the classification covers tree work and workers' compensation coverage is on file. Contractors must show their license number in their advertising, so ask for it if you do not see it.

What a good estimate includes

• Each tree and exactly what will be done to it.
• Whether the stump will be ground, and how deep.
• How brush and wood will be handled.
• How the lawn, roof and hardscape will be protected.
• Who handles City or HOA approvals.
• The price and payment terms. California limits down payments on home improvement contracts.

Questions to ask

• Who owns this tree? Is it a parkway tree?
• Is it near power lines, and has SCE been called?
• Will you top the tree? The right answer is no.
• Will you use spikes on a healthy palm? The right answer is no.
• Who on the crew has arborist training? You can verify ISA credentials through the ISA Find an Arborist directory.

Red flags

Be careful with door-to-door offers after a storm, cash-only deals, very large deposits, no written estimate, and anyone who suggests topping a healthy tree. Storms bring out crews passing through the Inland Empire, from Ontario to Fontana and Rialto.

Next steps

For your own trees, see tree removal and tree trimming. Our guides on tree removal cost and Ontario parkway tree rules help you plan. Whether you live near Toyota Arena or in Ontario Ranch, call (909) 479-2614.

Payment and contracts

For home improvement work in California, CSLB advises that a down payment should not exceed 10 percent of the contract price, and later payments should not get ahead of the work completed. Get the contract in writing, read it before signing and keep a copy.

After the job

Before the final payment, walk the property with the crew lead. Check that all the agreed trees were done, brush and wood were handled as promised, the stump was ground if it was in the contract, and the lawn, roof and hardscape are undamaged.

Keep a copy of the estimate, the contract and the license number together in case questions come up later.