The remains of a 1st century building have been uncovered during the renovation of a building in Rome which the Australian Catholic Church is converting to a pilgrim centre for visiting Australians.

Architect, Chaira Scandaletti, said that the remains of a 1st century herringbone stone pathway, the wall of a house and a section of column could be seen in the foundations.

The ancient finds have already been protected and upon completion of the project will be on display for the religious tourists.

Prior to being purchased by the Australian Catholic Church, the 19th century building was the student house of the Marist Fathers.

It is located a short distance from Stazione Termini or Rome's Central Station.?In the 1st century this was between the two walls which surrounded the Roman city.

Accommodating 80 people, Domus Australia will be a "home away from home" — but not a hotel. Prices will be comparable with those of other church hostels in Rome.

Cardinal Pell laid the foundation stone prior to work beginning in July last year. He also walked over the site this week to see the ancient finds and speak with the architect.

The chapel, which will accommodate around 200 people, will also feature a number of paintings by renown Sydney artist Paul Newton.

Other 19th and 20th century artworks to be featured at the centre are also being faithfully restored. Already some of these paintings that have been cleaned of the many layers of dirt and dust have revealed vibrant colours underneath.

Builders are not ruling out finding more 1st century tiles or foundations - but they do guarantee 20th century comfort when Domus Australia opens early next year.