No mystery to it. Here is exactly what happens from the moment you call to the moment we hand the job back.
Structure type established and suspect materials tested for asbestos. Testing costs little relative to discovering the problem mid-demolition, which stops the job.
If the frame has value, approach reclamation companies before committing to mechanical demolition. This can change the economics and is worth the delay to explore.
Demolition permit obtained and utilities disconnected, including any overhead service drop, which requires coordination with the utility rather than the contractor.
Any regulated materials removed under the appropriate procedures first, then the structure demolished with materials separated for recycling and scrap where practical.
Foundation and slab taken out if specified, site backfilled, compacted and graded. Agree in advance what the finished site should look like.
None of this is required — it just makes the visit quicker.