New study shows Green Building doesn't cost more.

The following is from blog.inhabitconsulting.com/2008/12/new-study-exposes-green-building-costs.html

New Study Exposes Green Building Costs & Benefits

Recently a study was published by
Good Energies
a global energy efficiency and renewable energy investment company, that analyzed nearly 150 green-built buildings in 10 different countries to try to get a handle on the truth about the additional costs and benefits of building green. There were some surprising conclusions.

Among them:

On average, the "public" perceives the additional costs to build green at about 17%.
In reality, the median additional costs for building green proved to be less than 2%.
Over half of the buildings studied had a green building payback period of less than five years from energy and water savings alone (a five year payback is a 20% return on investment.)
Up front infrastructure development costs in "conservation developments" can be reduced by 25%, or approximately $10,000 per home.