Segovia (Spain) was declared by UNESCO World Heritage Site in 1985. The urban palaces built in Segovia, between the 15th and 18th centuries, are functionally distributed around interior patios with galleries on three or four sides. In view of the current purpose of the buildings, some modifications might be needed, this can be done in three different ways: Partial closure of the gallery with windows, new structures covering the whole patio or no modification at all (open patio). Discussion addressing the three different approaches and their implications regarding heritage and hygrothermal performance will be presented.