To hire anyone under the age of 18 in Washington, there are specific laws and rules employers must follow. Minors are allowed to work limited hours compared to adults in Washington.Washington State and federal laws spell out which jobs are prohibited. All minors under 18 are prohibited from doing the following work in any industry. You can't hire minors in Washington unless you have an endorsement on your business license that says you can. Washington has labor laws to protect workers under the age of 18. There is also an annual parent and school authorization form deadline of Sept. 8 hours of work per day, 40 hours per week up to 6 days a week are permitted when school is off. This brochure answers many questions employers, teen workers and parents have about non-agricultural work rules, permits and conditions for working minors. However, employers of minors under age 18 must obtain and keep on file proof of the minor's age.