Meanwhile, domestic architecture had continued to develop, with the Normans, having first occupied the older Anglo-Saxon dwellings, rapidly beginning to build larger buildings in stone and timber. The elite preferred houses with large, ground-floor halls but the less wealthy constructed simpler houses with the halls on the first floor; master and servants frequently lived in the same spaces. Wealthier town-houses were also built using stone, and incorporated business and domestic arrangements into a single functional design. By the 14th century grander houses and castles were sophisticated affairs: expensively tiled, often featuring murals and glass windows, these buildings were often designed as a set of apartments to allow greater privacy. Fashionable brick began to be used in some parts of the country, copying French tastes. Architecture that emulated the older defensive designs remained popular. Less is known about the houses of peasants during this period, although many peasants appear to have lived in relatively substantial, timber-framed long-houses; the quality of these houses improved in the prosperous years following the Black Death, often being built by professional craftsmen.