The island of Korčula is in a group of middle Dalmatian islands and it is 40 kilometres long, going from east to the west. The town of Korčula on Korčula Island in many ways represent a unique rational urban regulation and is one of the best surviving examples of medieval town in general. Research indicates that the town was founded in the mid 13th century, as a very important station on the Adriatic transversal that connected Venice with its other holdings. One of the important figures related to the founding of the city is Marcilius Zorzi. The town developed immensly in the 13th century, which is the century of the Korčula Statute from 1214. With the arrival of the princees from the Zorzi family in the 13th century, Korčula continued in the following centuries to flourish and reached the peak of its power in the 16th century. The main point of this work is the progress of town Korčula in the 15th and 16th century. Large building activity in this city of stonecutters, its wealth and progress conceived in the 14th century have developed during the 15th and 16th centuries and with the Gothic- Renaissance and later alterations most of the oldest buildings were erased, so that, at least for now, there are no trace of the Romanesque house style which are abundant in Split, Trogir and Zadar, and very little, but in Rab, Kotor, Poreč, Dubrovnik, and in Šibenik. It is because of the limited space of the peninsula, bounded by the sea and a moat, that its existing space was used to its limits with narrow streets and cramped squares. To build in higts was the only avalable option, and so came the results in the 15th century as a multistorey buildings. They were mostly three-storey building that received light and air through the airy triple and double windows which were adopted by the Dalmatiaclip engage streets and in the height, spreading the space with balconies and occasional lodge. Architecture and urban planning of the city of Korčula, which formed in the 15th and 16th centuries, is also a look that prevails today. This period was indeed fruitful for the city of Korčula, despite its turbulent circumstances that have surrounded it then, butnevertheless it survived up to this day.