This is so wrong it hurts. The cost of the "house" is the land. Building houses has never been cheaper. Just like everything else has never been cheaper.
I don't think this is correct - construction costs are currently below the all-time peak, but they have been steadily increasing. According to the National Association of Home Builders (NAHB):
"The average construction cost of a single-family home in the 2013 survey is $246,453. This average is significantly higher than the 2011 average construction cost of $184,125, and is the highest it has been since 1998. Although the cost of construction per square foot remained relatively stable in 2009 and 2011 ($82 per square foot, and $80 per square foot, respectively), it jumped to $95 per square foot in 2013."
Also, regarding the relative impact of land cost vs construction costs:
"NAHB’s most recent construction cost survey (conducted in August and September of 2013) shows that although lot sizes are shrinking, both the cost and size of the home are on the rise. The average home in our survey was built on 14,359 square feet (about a third of an acre) of land, had 2,607 square feet of finished area, and sold for $399,532. The average share of the home’s sales price which goes to construction cost jumped from 59 percent in both 2009 and 2011 to 62 percent in 2013. Finished lot costs, accounting for the second largest share of the sales price, dropped from 22 percent in 2011 to 19 percent in 2013."
The situation might have changed since this survey in 2013, but this is the most recent information I was able to find.
"The average construction cost of a single-family home in the 2013 survey is $246,453. This average is significantly higher than the 2011 average construction cost of $184,125, and is the highest it has been since 1998. Although the cost of construction per square foot remained relatively stable in 2009 and 2011 ($82 per square foot, and $80 per square foot, respectively), it jumped to $95 per square foot in 2013."
Also, regarding the relative impact of land cost vs construction costs:
"NAHB’s most recent construction cost survey (conducted in August and September of 2013) shows that although lot sizes are shrinking, both the cost and size of the home are on the rise. The average home in our survey was built on 14,359 square feet (about a third of an acre) of land, had 2,607 square feet of finished area, and sold for $399,532. The average share of the home’s sales price which goes to construction cost jumped from 59 percent in both 2009 and 2011 to 62 percent in 2013. Finished lot costs, accounting for the second largest share of the sales price, dropped from 22 percent in 2011 to 19 percent in 2013."
The situation might have changed since this survey in 2013, but this is the most recent information I was able to find.
EDIT: Source - http://nahbclassic.org/generic.aspx?genericContentID=221388