Most ERC companies are asking the appraiser to analyze the last 6 quarters to establish a trend line.
I would challenge Bob Hereford concerning his statement ... the best way to determine the market is to use the same property that has sold twice in, say, a year".
The problem with doing that is the second sale is usually a distress sale. No one, in their right mind, would buy a house and then re-sell it in a year...as a typical transaction.
Much of what we see with those types of sale are either a divorce, bankruptcy, job loss, or job transfer. On the positive side are legal flips where the property was purchased in poor condition, renovated, and then sold. In either case, these are not "typical" transactions. I also believe a single transaction does not a market make.
I prefer to use a broader data set for my analysis. A one square mile grid usually works well for me. I like to compare the current six month period to the preceding six month period. As an example, I might input into the search function a one square mile grid, a style of home, and bracket the total square footage. Maybe 20 or 30 sales will come up and by using the "Stats" function, it will give me the low sale, median sale, and highest sales price. It also provides an average days on the market.
I then change the time period to the preceding six month period. I might find another 15 or 20 sales which are similar in style, size, and geographic location. By comparing the median price of these sales I can determine the percentage of increase or decrease in sales prices. The broader the data set the greater my confidence in the results.
Our market (Bob and I are both in Colorado Springs) is experiencing an increase in the number of listings and a decline in the number of sales...IN MOST AREAS. The funny thing is that the sales prices have shown an increase over-all for the past year.
So, are we really in a declining market? I certainly don't want to be the only appraiser reporting that. I have discussed this with the three other appraisers in the family and also with a number of other VA appraisers. We all concur ... the market is stable at this time; however, there are indicators which could reflect a potential decline in values in the future.
Some of those indicators are...increased number of listings, expanding days on the market, lower sales price to list price (SP/LP Ratio), decline in building permits, increase in foreclosures, and the ever popular..."bad news in the media".
So, what is an appraiser to do? The box we check on the URAR form says....declining property values. Have your values actually declined? Is the glass half full or half empty? The media would like us to think the national economy is in total disarray and yet the stock market is in record high territory. Inquiring minds want to know!