Type of Appraiser who tells you how to increase value

[Cliff T.]

I've read on several occasions of a certain type of residential real estate appraiser who will tell you how much value certain improvements will make on a given property. This allows you to assess the cost to improvement value of various options on each property. They come out and assess how to add the most value for the least amount of cost! I just can't for the life of me recall what this type of appraiser is called. Can anyone help me put a name on it?