If you go to NAHB.org you can look for builders by location. It will also indicate if the builder has the Green Building designation (CGP for Certified Green Professional).
Check with the USGBC-Illinois's Green Pro Directory on the GreenBuilt Home Tour website. The 2014 GreenBuilt Home Tour features green homes across Chicagoland, with one right in Naperville. The public is invited. Tickets are available for purchase for the tour which takes place the last weekend in July. Go to: www.greenbuilthometour.org
Brickwood Builders, Inc.
Illinois Green Alliance