The next step is to locate all of the actual damage. This is a very important process that needs to be done thoroughly and correctly. Start with the easiest and most obvious, the things you can see right away. Make a list of everything you see that needs to be replaced. This is step one of determining how much the repairs will cost you. Next, you will start looking for areas in the walls, ceilings, and floors that have been burnt through. Behind the walls check the studs for damage, under the floors, check the floor joist, and in the ceilings check the rafters and trust. Add everything that needs to be replaced to your list.