The buildings are structured in a dense layout with the main building material to be the stone and a kind of a mud mixture with the porcelain as the basic ingredient. The houses were double-decked, dome-roofed and with flat apartments. The ground floor was arranged in two areas. One area was used as stable and the other as a storage area. The access to the second floor from the ground floor is able through a stone made dome-roofed staircase which leads to “pounti”. The “pounti” is a central open space over the floor –the byzantine heliacal- which is an inseparable part of the house as it contributes to its ventilation and lighting from the sun. Around the “pounti” are located two or three rooms and the kitchen area. The overall structure of the houses along with their external morphological characteristics testifies its clear byzantine origin.
The village streets are paved with stones and have a central ditch to drain the rain water. These streets were dismantled in 1970 because of the construction of the sewage system. Some alleys, mainly around the church, have been paved again like the old times. At the end of 17th century, when the pirate raids were very sparse, additional gates constructed in the village according to the initial building plan of the castle. It also began the construction of doors and windows at the houses that were attached to the external castle wall to offer a better living to their residents. It is worth mentioning the fact that when the great earthquake of 1881 was happened, Mesta was one of the few villages of Chios not to be destroyed. This proves the strong and robust construction of the village which stands impressive until our days despite the passing of the centuries.