In training my appraisers, this chart in the Marshall & Swift manual has benefited us greatly. Obviously, it is still an opinion and the life cycle chart only gives approximate ranges, it is still useful.
In reviewing, I have never agreed with people who call the EA "0" People really don't do that....do they?? after some remodeling. In my opinion, it is never brand new again. I have a hard time even believing "5" years on 20-30 year old homes that have been updated. To get to "5" again for a 20+ year old home would require a complete gutting with new wiring,plumbing,fixtures,walls,floors,etc. Absolutely.
hope the chart helps