Think I said this in another thread...."Marketability, marketability, marketability". The purpose of the appraisal it advise the intended user of the appraisal (like that term?) the value of the property as colateral for a loan...in most cases.
Forget you are an appraiser. Now you are a lender with say $150,000 to invest and you want to do it in the form of a mortgage loan. You want to know that if you have to take the property back can you sell it. Remember you will have both time and costs involved in the event of foreclosure. How would you rate the property?
For lending purposes Fannie Mae has said the following are recommended ratings for condition:
Good, Average, Fair, and Poor.
Good, average, and fair are all acceptable and Fannie Mae will purchase the loan. Most appraisers are reluctant to use fair because many loan officers and underwriters are mistaken about the guidelines.
I prefer to add a couple more classifications so that I can be more descriptive. Mine are as follows:
Excellent - Indicates the best. Either new or totally renovated.
Good - Well maintained, usually updated
Above Average - looks better than most other similiar homes in the neighborhood
Average - Reflects what is typical for the neighborhood
Below Average - looks worse than most other similiar homes in the neighborhood, shows signs of deferred maintenance.
Fair - Habitable but substantially worn, needs updating and a general clean up.
Poor - Need lots of work. Major renovating. Might not be habitable. Would not appeal to a typical buyer.
As far as dollar adjustments it will depend on the price range of the homes homes and typical costs for your market. Over the years I have developed adjustments that are rounded to the nearest $1000. In a lower median priced neighborhood that adjustment might be $3,000 increments. Sometimes certain repairs, remodeling, or updating might be reflected on two lines (the age line and the condition line). There is no real guideline for this, it is subjective and the reason it takes experience to be an appraiser.
What really helped me was 12 years in real estate sales before becoming an appraiser. I was able to recognize "buyer reaction" to things like condition. It is not uncommon for buyers to think in terms of $1,000 for minor stuff, $3,000 for substantial repairs and updating, and $5,000 to $10,000 for major items.