Delaware Code
Subchapter IV. Compulsory Insurance, Self-Insurance and Substitute Compensation Systems
§ 2371. Insurance of employer's compensation liability.

(a) Every employer to whom this chapter applies shall insure the payment of compensation to the employees, or their dependents, in the manner provided in § 2372 of this title. While such insurance remains in force, the employer shall be liable to any employee, or the employee's dependents, for personal injury or death by accident only to the extent and in the manner specified in this chapter.
(b) Every employer having a primary place of business in another state shall carry Delaware workers' compensation coverage in full for any employees doing substantial work in the State as if they were an employer in Delaware. Every such employer whose employee is injured during the course of employment within the territory of the State shall notify such employee of that employee's rights under this chapter.
(c) Substantial work shall include, but not be limited to:

(1) A construction or contracting business for which a Delaware employer would be required to be licensed under Chapter 25 of Title 30;
(2) A business of any sort in which 1 or more employees is primarily engaged in the business of the employer in the territory of the State of Delaware for more than 5 consecutive work days at a single time; or
(3) Working for a business of any sort in which 1 or more employees is primarily engaged in the business of the employer for more than an aggregate of 3 weeks in any 6-month period. For purposes of this section a week shall consist of 5 consecutive work days.
(d) The insurance required of the above-described employers shall consist of:

(1) An actual Delaware workers' compensation policy covering the activities of the employer for any employee engaged in the employer's business in the territory of the State; or
(2) A written rider on an out-of-state policy of insurance covering the work activities of the employees as fully and completely as an actual Delaware workers' compensation policy would; or
(3) A declaration of self-insurance that would be valid and acceptable if made by a Delaware employer in the territory of the State providing such coverage, filings and surety as is required of Delaware employers to be self-insured for claims for Delaware workers' compensation.
(e) All such employers described in this section shall comply with §§ 2372, 2373 and 2374 of this title.
(f) Every Delaware construction or contracting business employing an out-of-state business for which a Delaware employer would be required to be licensed under Chapter 25 of Title 30 shall verify in any business transaction that the out-of-state construction or contracting business is in compliance with this requirement.