This paper aims to evaluate the implementation of “Tsukuba Science City Lot Control Ordinance” in 4 years with the view of lot control. The ordinance which was enacted by Ibaragi prefecture under the Article 50 of building Standard Act prescribes the procedure of minimum lot (165m2) regulation, lot recognition and lot register system among other things. The evidence shows an effect of minimum lot regulation but it is founded that local authorities should implement complementary devices which are not prescribed by the ordinance.
