Identify which panel moved
Compare neighboring panels and look for evidence of settlement, root pressure, erosion or nearby excavation. A contractor may need to assess more than the single most visible joint.
Think about walking access
Uneven joints can create trip hazards. Keep people away from an obviously hazardous area where practical while you determine the appropriate next step. Do not assume a temporary patch is a permanent solution.
Check cracks and drainage
A heavily cracked panel may not be suitable for lifting. Water collecting along a joint can also indicate that the finished slope and surrounding drainage need attention.
Confirm local requirements
For sidewalks in or near a public right-of-way, verify who is responsible and whether permits or approved methods apply. Requirements can vary by municipality and property circumstances.
Choose a repair based on the cause
Lifting may be considered for an intact settled slab, while root-related displacement or major breakage may call for another approach. Ask how the recommended work addresses adjoining panels and long-term access.