Start with the existing finish
If asbestos is a concern because of unknown material history, testing belongs before disturbance.
Painted texture changes the decision
Normal removal work begins with protection and a method appropriate to the coating. Dust control reduces spread but does not make drywall work dust-free.
Read more about painted popcorn ceiling removal and why the surface should be tested before a method is promised.
Repairing the exposed ceiling
The exposed ceiling may need local repair or broader resurfacing before primer and paint.
The finishing scope may include ceiling repair, skim coating, sanding, primer and paint. Not every ceiling needs every stage.
Planning a finished scope
Multi-room work is planned around hidden repairs and the final finish requested. Removal alone is kept distinct from a ceiling taken through paint.
What affects the estimate?
Area is one factor, but it does not describe the whole job. Height, access, number of rooms, furniture protection, coating, substrate damage and the finish required all contribute to the scope.
The popcorn ceiling pricing guide explains why two ceilings with similar dimensions can require very different preparation.