I don't expect material improvements until 2026 at the earliest. 

You could argue that your property has not materially improved and does not meet the same value as the most recently sold properties.

Replacing one bad fixture between material and labor can end up being 3X the cost of buying the better quality fixture in the first place.  

Most are flimsy, thrown-together with uber cheap materials. 

Sometimes the contractor will put a % on the top of the materials to source it.2) what's your range for remodeling a bathroom?

Keep in mind his financial numbers are only material when offering an investment.

Literally hundreds of pages of material in 3 workbooks.

I would need to know more specs on the house but with material shortages It's difficult to say how much to budget. 80K-120K for full gut perhaps but unsure with lumber beings so expensive and shortages.I would plan 9 months of vacancy between the pain you will endure pulling permits & having your contractors show up everyday to complete the work & then final inspections to get a CO. 

The cost of labor , materials , property taxes , inflation , interest rates  etc .

Ran into many problems with contractors along the way, paid for some material twice as well as some projects to be redone.