IN THIS GUIDE · Show what this employee knows that the company's other engineers do not, and who controls the work at the client site
Start with the L-1B eligibility and application overview
Specialized knowledge is about the company, not the field
The statute defines specialized knowledge as special knowledge of the petitioner's product, service, research, equipment, techniques, management or other interests, or an advanced level of knowledge of its processes and procedures. A skilled CNC programmer who could work at any aerospace supplier has general skill. An engineer who designed the shop's traceability procedure, trained the inspectors on it and holds the internal documentation that no one else fully understands has knowledge of the company. Explain what he knows, how long it took to acquire, how many others hold it, and why the U.S. assignment needs it. The first review should yield a short knowledge map: the internal system, the employee's training path, other people who know it, and the work the U.S. entity needs done. Training records, controlled manuals, and version history settle those points better than descriptions calling the employee exceptional.
Offsite placement must remain the petitioner's work
Placing an L-1B employee at an unaffiliated worksite is permitted only if the employee will not be principally controlled and supervised by the unaffiliated employer and the placement is not essentially an arrangement to provide labour for hire. The East Hants shop must keep directing the engineer's work, and the assignment must involve applying the shop's own specialized knowledge — implementing its procedure — rather than filling a vacancy on the customer's staff. The customer contract, the reporting line and who evaluates his performance all show which it is.
The year abroad and the corporate relationship still apply
L-1B carries the same one-continuous-year requirement within the preceding three years and the same qualifying-relationship requirement as L-1A. The petitioning U.S. entity must be a parent, subsidiary, branch or affiliate of the East Hants employer, and both must be doing business. A U.S. customer is not a related entity. If the shop has no U.S. entity of its own, the structure has to be examined before the specialized-knowledge question is even reached.
Duration and the household
L-1B is limited to five years in total, and time in L-1B counts toward the seven-year L-1A limit if the employee later changes roles. The L-2 spouse is employment-authorized incident to status; L-2 children may study but may not work. Track every prior period in L classification before accepting an assignment. L-1B time is limited to five years, and time in that status is counted when the person later seeks an L-1A stay, whose ceiling is seven years. A change in title does not erase time already used.
Sources reviewed 2026-09-07. This guide covers a preparation focus; it is not an individual eligibility assessment.