The amount of water you can see is only part of it. Three other things usually decide the size of a job. How long the materials stayed wet matters, since the EPA aims for 24 to 48 hours as the time to dry items and areas that got wet. Which water it was matters too, because supply-line water, rain and sewage lead to different cleanups. And what it soaked counts: carpet, pad, drywall and insulation each follow different rules in the extension guides.
That is why a short description over the phone helps the contractor, and a visit helps more. Common questions works through the rest, with the source for each answer.