Can someone try and explain the cost approach?
Please Help!
I will not attempt to teach you how to perform a cost approach, however, I can give a brief explanation of why I believe it is relevant in appraisal practice.
I am definitely no expert in the cost approach and would not hold myself out as one. This is my opinion on the fundamental concept of the cost approach.
Appraisal of Real Estate 13th Edition
Chapter 17
The Cost Approach
"The principle of substitution is basic to the cost approach. This principle affirms that a knowledgeable buyer would pay no more for a property than the cost to acquire a similar site and construct improvements of equivalent desirability and utility without undue delay."
Buyers in the market make a decision, should I buy an existing home or build new? That is what the appraiser is doing completing the cost approach. Emulating the market. If the cost new is significantly less than the cost of an existing comparable home, no one would buy the more expensive existing home. (or vice versa, if the cost new is significantly more than the cost of existing comparable homes, there would be no or very few new construction limited to only the very wealthy not concerned with price)
A cost approach significantly lower than the sales comparison approach goes against the principle of substitution.
If it only cost $400,000 to buy a lot and build a new home, but existing comparable homes are listed for sale at $800,000, there would be no buyers for the $800,000 property; until market conditions decreased and existing homes can be purchased for $400,000 or less, or the cost of construction increased to $800,000 or more.
The cost approach helps determine highest and best use as though vacant.
The cost approach helps determine if it is cost effective to build new or buy existing.
The cost approach helps determine if the improvements should be demolished and a new similar or different improvement should be built.