Define the staircase scope
Count the treads and landings, describe the riser material, and note existing carpet or paint. Ask what is included around nosings, skirt boards, and handrail connections. Replacing treads is a different job from refinishing sound existing wood.
Coordinate the look safely
Review the finish, sheen, and care requirements with the contractor. Discuss traction, household use, pets, and lighting. A visual match to an adjoining floor should still work for the way the staircase is used.
Plan access before coating
If the stairs are the only route to a bedroom or exit, discuss the sequencing before work starts. Get clear instructions about when each section may be used. Do not assume a general drying estimate applies to every coat or staircase.