It's really up to the appraiser to decide, I have completed appraisal reports and a comparable sale was a new property that started construction in October of 2021, construction was completed in December 2021, property closed in January of 2022, when place in the grid of appraisal report, it shows as a 1 year old property, even though it was completed a month ago, I called the comparable C1 and EXPLAINED in the appraisal report.
To me (and I may be wrong, I'm sure others will tell me I am wrong) , this is one of the reasons that the Condition Ratings and Definitions state C1 to be "have not been previously occupied" for situations like this, just my opinion, but you have to LOVE AF, I mean 7 pages of people pontificating on the matter and telling others they are wrong, when it's simply the OPINION of the appraiser to determine things like this.
C1
The improvements have been recently constructed and have not been previously occupied. The entire structure and all components are new
and the dwelling features no physical depreciation.
Note: Newly constructed improvements that feature recycled or previously used materials and/or components can be considered new dwellings
provided that the dwelling is placed on a 100 percent new foundation and the recycled materials and the recycled components have been
rehabilitated/remanufactured into like-new condition. Improvements that have not been previously occupied are not considered “new” if they
have any significant physical depreciation (that is, newly constructed dwellings that have been vacant for an extended period of time without
adequate maintenance or upkeep).
C2
The improvements feature no deferred maintenance, little or no physical depreciation, and require no repairs. Virtually all building components are new or have been recently repaired, refinished, or rehabilitated. All outdated components and finishes have been updated and/or replaced with components that meet current standards. Dwellings in this category are either almost new or have been recently completely renovated and are similar in condition to new construction.
Note: The improvements represent a relatively new property that is well maintained with no deferred maintenance and little or no physical
depreciation, or an older property that has been recently completely renovated.