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The nucleus of the old city, an important cultural and commercial centre, used to be a military camp, attested in documents with the name "castrum Clus".

The oldest residence in Cluj-Napoca is the house of Matthias Corvinus, originally a Gothic structure that bears Transylvanian Renaissance characteristics due to a later renovation. Such changes feature on other Hungarian townspeople's residences, built from the mid-15th century mostly of stone and wood with a cellar, ground floor and upper storey, in the Late Gothic and Renaissance styles; although the late medieval houses have often been considerably altered, the street façades of the old town are mostly preserved. St. Michael's Church, the oldest and most representative Gothic-style building in the country, dates back to the 14th century. The oldest of its sections is the altar, dedicated in 1390, while the newest part is the clock tower, which was built in Gothic Revival style (1860).

As Renaissance styles survived late in the city, the appearance of Baroque art was also delayed, but from the mid-18th century Klausenburg was once again at the centre of the development and spread of art in Transylvania, as it had been two centuries earlier. The first enthusiasts for Baroque were the Catholic Church and the landed aristocracy. Artists came initially from south Germany and Austria, but by the end of the century most of the work was by local craftsmen. The earliest signs of the new style appear in the furnishings of St. Michael's church: the altarpieces and pulpit, which date to the 1740s, are carved, painted and richly decorated with figures. An altarpiece depicting the Adoration of the Magi (1748–50) is the work of Franz Anton Maulbertsch. The earliest two-towered Baroque church was built by the Jesuits from 1718 to 1724 on the pattern of Košice and was later handed over to the Piarists. During the century more simply designed Baroque churches were built for the mendicant orders, Lutherans, Unitarians and the Orthodox Church. The noble families built houses and even palaces in the old town.

The Baroque Bánffy Palace (1774–1785), constructed around a rectangular yard, is the masterpiece of Eberhardt Blaumann. Its peculiarity lies in the appearance of the principal façade.

Both Avram Iancu and Unrii Squares feature ensembles of eclectic and baroque–rococo architecture, including the Palace of Justice, the Theatre, the Iuliu Maniu symmetrical street, and the New York Palace, among others. In the 19th century many houses were built in the Neo-classical, Romantic and Eclectic styles. Also dating to that period are the two-towered Neo-classical Calvinist church (1829–50), its new college building of 1801, and the City Hall (1843–6) in the marketplace, by Antal Kagerbauer.
The banks of the Someşul Mic also feature a wide variety of such old buildings. The end of the 19th century brought a building ensemble that fastens the corners of the oldest bridge over the river, at the north end of the Regele Ferdinand Avenue. The Berde, Babos, Elian, Urania, and Szeky palaces consist of a mixture of Baroque, Renaissance and Gothic styles, following the Art Nouveau/Secession and Revival specifics.
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