The urban houses of Eratyra were built by families whose income originated from trade and emigration. The oldest of these mansions date to the 18th century and resemble their contemporaries, the mansions of Siatista. They have two storeys and are L-shaped in plan.
On the ground floor, around the flagstone courtyard, are the 'strotos' (family sitting room) and a second room for auxiliary functions, while at the rear of the house is the 'katoi' (a semi-basement with a few openings), where foods were stored. The kitchen, oven and lavatory are in the so-called 'magereio' (cooking shed), a small building in the courtyard near the house.
The wooden staircase in the courtyard leads to the upper floor ('anoi'), where on the two long sides of the open 'liakoto' (sun room) four rooms were arranged, of which the 'bas-ondas' was the main reception room. In the older houses, the roofed balconies, supported on buttresses, project symmetrically from the two ends of the main facade and the central portion of the rear.
In the later houses, the balcony, now projecting from the middle of the front of the upper storey, is supported by wooden columns, creating a semi-open area in front of the entrance, the 'hayiati'.
Unworked limestone blocks quarried locally and bonded with mud were used as construction materials for the ground floor, while for the upper floors lighter materials were preferred (such as 'tsatmas', half timbering and plaster with infill).