Thermador 2012-2013 Kitchen Design Challenge. NO PURCHASE OR PAYMENT NECESSARY TO ENTER OR WIN. Kitchens must have been designed and be completed between December 1, 2011 and December 31, 2013. Contest entry begins at 12:00:01 am PT on 2/22/13 and ends at 11:59:59 pm PT on 3/1/14. Open to legal residents of the 50 U.S. and D.C., who are professional designers, architects, builders, remodelers and kitchen dealers (i.e., persons who are paid for residential kitchen design services) and are 18 years of age or older at the time of entry. Void where prohibited. For details and complete Official Rules, click here.