Short answers, pulled from the story.
Etruscan architecture emerged around 900 BC and persisted until the Roman absorption of their civilization in 27 BC. This timeline covers the entire period during which these people built extensively with stone, wood, and other available materials to create temples, houses, tombs, and city walls.
Archaeologists have found that only tombs and defensive walls remain in significant numbers today because most structures were made from perishable materials like mud-brick and timber. The lack of surviving buildings has forced researchers to rely on pottery models and written accounts to understand what once stood before Greek architectural styles began influencing designs heavily from about 630 BC onward.
Most Etruscan temples featured a stone podium or base platform but used wood and mud-brick for upper sections while exteriors were highly decorated with colorful painted terracotta elements. Wooden columns often had their bases and capitals encased in painted terracotta to protect them from weathering and every edge of the roof was decorated mostly in brightly painted terracotta tiles.
Very little evidence exists regarding what actual homes looked like outside of burial contexts where rock-cut tomb chambers sometimes form suites of rooms that resemble atrium homes of better-off citizens. One complete set of foundations measures 7.9 meters by 3.9 meters for a single house yet even well-off families rarely lived in stone houses according to current archaeological findings.
The Banditaccia and Monterozzi necropolises contain thousands of burials packed closely together in southern Etruria regions where burial chambers were cut directly from solid rock below ground level. Other areas featured structures built up above ground instead of underground excavations while some tombs functioned as stone buildings arranged in rows resembling small houses themselves.
Etruscan cities often sat on hilltops and became walled from about the 8th century onward with an agger rampart and fossa ditch standing in front of most defensive walls. Major routes could reach widths up to 10.4 meters along stretches connecting Cerveteri with Pyrgi featuring a gravel surface between tufo edging-blocks with a central drainage channel running through.