The first guidelines for thermal comfort in buildings in The Netherlands were developed in the late 70s and in the 80s. They were based on the PMV-PPD relationship. In this article new guidelines are presented, based on the international research on adaptive thermal comfort. Two building/climate types are introduced: "Alpha" and "Beta", analogous to the categories in the field studies on adaptive thermal comfort. For each building/climate type operative indoor temperature limits are given as a function of the running mean outdoor temperature and classified according to NPR-CR 1752. Finally some initial temperature simulations are shown, the results of which are plotted in the new comfort zone. (c) 2005 Elsevier B.V. All rights reserved.