That would be reasonable Denis... in a perfect client world.
If I knew my client is a buyer who has dreams of fixing and flipping, I might quote him a range of fees based on how detailed the inspection had to be, how severe or moderate deferred maintenance might be, how accurate the estimate/opinion had to be, etc.
But when broker or lender clients ambush me with these types of post submission requests, I get pretty testy. It's easy to figure out C2C for individual items, like a roof, or broken windows, or floor coverings. But what about...
a little (87 yr) old house that is "showing its age" (typical of houses in this little town). The client requested an "as is" appraisal. The appraiser did a pretty good "as is" appraisal that noted the age related short commings and applied a "condition" adjustment on the SCA grid (with supportive comments).
The condition rating typically isn't based on one item, several items or even many specific items. A house like this may need major updates to kitchens and baths, plumbing, electrical, roofing, paint, cleaning, floor covering, spider webs, stinky bedrooms, torn, misssing or bent out of shape screens, painted shut windows, dry and cracked window glazing, dried out wood siding, holes in the porch, overgrown or neglected landscaping, sprinklers that don't work, trash in the crawl space, water in the crawl space, kitchen and bathroom cabinetry rotting away from leaking plastic plumbing, rotten gray water in the dishwasher.... in general, a pooped-out tired old house.
You think I'm going to make a detailed list of the estimated cost to repair each item? No. I'm going to find houses that appear (from exterior inspections, MLS comments and photos, agent interviews) to be similar. I'm going to find sales of similar houses which are not afflicted, less afflicted, completely remodeled, etc. and come up with a WAG for a condition adjustment.
So when they ask for a "cost to cure" I ask how much do you want to cure? And how much more are you willing to pay me for this extra work?