Of course, dealing with FNMA or FHA...but the textbooks make it plain. This is a place where the cost approach can be applied and, in my opinion, should be.
And if I have new construction plus lot sales I got 4 pieces of data to extract. The bare lot price, the extracted value of both site and building improvements and with the cost book I can calculate the spread between the cost book and improved value, and from that calculate the EP and contributory value of the site improvements (driveway, landscaping, septic and utilities as applies.)
$330,000 SP
$66,000 lot price
$264,000 - all improvements
$220,000 cost book estimate
$44,000 net to EP & Site
$33,000 - 10% EP for builder
$11,000 - landcaping, utilities, and driveway