Archaeological investigations undertaken at Calatia aimed towards defining the layout of the ancient town and creating an archaeological park. Trenches were dug in the centre of the town, within a strip that included the via Appia and the insulae closest to it. A road on an east-west alignment was identified to the south of the via Appia and running parallel to it. Part of the ancient road was uncovered in an area free of modern constructions. Finally, to the north, an investigation was undertaken of the space occupied by a monumental portico, part of the forum or adjacent architectural complex. The layout of the road network created a regular plan with horizontal strips circa 70 m wide, divided into quadrangular insulae. The town plan was orientated towards the north, with a slight deviation to the west. The road levels investigated so far relate to the last structured occupation of the town and date to the 4th-5th century A.D. The stratification along the Appia was more complex, where larger deposits accumulated due to the ancient road’s long period of use, which continued beyond the chronological limits of _Calatia_. A final intervention looked at the area south of the Appia where there appeared to be an anomaly on the plateau occupied by the town. A structure in tufa blocks faced with _opus reticulatum_ was uncovered which showed the signs of numerous rebuilds which had partially altered the monument’s original appearance. The structure was on a north-west/south-east alignment and as such represents an anomaly when compared to the general layout of the urban plan known to date. Large quantities of material were recovered during the cleaning of the overlying accumulation and this was of great interest both for the reconstruction of Calatia’s chronological _excursus_, and for the study of the classes and pottery forms in use. Also present were architectural elements and terracotta ex-voto which provide useful evidence for the buildings use.

The trial trench dug in the south eastern sector of the Calatia’s urban centre aimed to the identify the via Appia which crossed the town as the _decumanus maximus_. A stretch of basalt road was uncovered, which can be identified with the consular way. On an east-west alignment, it was associated with a well and the remains of structures built of tufa blocks, datable to the end of the mid Republican period. Furthermore, evidence showed that the area was in use, and underwent partial alterations, until the late Roman period. Recent investigations confirmed that between the end of the 4th century B.C. and the early 3rd century B.C. there was a great change in the urban layout, attested amongst other things by numerous pits containing dumps of material which did not go beyond the 4th century B.C.

Further investigations were undertaken in the urban context of _Calatia_, in particular in the area shown on RAF aerial photographs to be the site of an altimetrical anomaly. This was formed by an accumulation of ancient debris and pottery, which produced the assemblage of architectural elements housed in the Civic Museum at Maddaloni. The town was laid out on a network of cardi and decumani, with rectangular _insulae_, orientated on almost astronomical alignments, its northern axis being only a few degrees out to the west. In the proximity of the rounded town walls that were a legacy of the archaic town, the _insulae_ were adjusted to fit their line, thus taking on odd alignments. The excavated house was aligned with and faced onto a road that must have followed the embankment of the town wall, possibly situated a few metres to the south. The house had a square plan, with a probable extension to the north, reached by a narrow corridor opening from the back of the _atrium_. The _atrium_ was surrounded by _cubicula_ and, with the _tablinium_ at the back. A staircase, situated in a closed corridor, led to the upper floor. The _impluvium_ was added during alterations and was later radically changed: its pool was filled with dark earth, rich in bones and pottery, a colonnade was built around it and it was perhaps transformed into a small garden. A rise in the floor level of the porticoes was contemporary with the alterations to the _impluvium_. The house was built in opus reticulatum, non of its decorations survived. Its foundation can be attributed to the second half of the 1st century B.C., the restructuring to the first half of the following century. The house is a good starting point for studies on private housing at _Calatia_ as it provides a complete model of a dwelling, evidence known to date only through historical references and partial finds. It may also provide evidence regarding the deduction of a colony to _Calatia_ at the time of Julius Caesar. In a peripheral position, it may not have been occupied for very long as a house and was then reused for a different function. The structure stands in an area that was previously occupied, perhaps by craft workshops.