Gothic architecture
Sens Cathedral (begun between 1135 and 1140) was the first Cathedral to be built in the new style (St. Denis was an abbey, not a Cathedral). Other versions of the new style soon appeared in Noyon Cathedral (begun 1150); Laon Cathedral (begun 1165); and the most famous of all, Notre-Dame de Paris, where construction had begun in 1160.
Gothic secular and domestic architecture
It was not only new, founded cities that had extensive building regulations. London, Florence, Paris, Venice and numerous smaller cities in Spain and Italy had rules concerning not only the height and shape of buildings, but also for example regulating the width of streets, the projection of roofs and rules concerning waste management, drainage and fire regulations. The Piazza del Campo in Siena, Italy is one of the earliest examples of "coherent town planning along aesthetic lines, perhaps for the first time since antiquity." Official regulations governing the size of the palaces facing the square date from 1298. The famous square is dominated by the Palazzo Pubblico, the town hall. With growing prosperity and an emerging sense of civic pride, town halls such as Palazzo Pubblico often became a show-piece of the cities' growing confidence. In the cities of northern Italy, this development started early and many Gothic town halls and other civic monuments have to a large extent survived to this day.