In the first stage, the architect Schultz Francisc did the restoration works. Although he had Arányi Lajos’ drawings Shultz worked by the specifics of the 19th century that stated that a monument had to be restored in a unitary style. Schulcz started to restore the Gothic architecture in the Knight’s Hall (he demolished all interior components, he dismantled the mortar, destroying even painting witnesses), he restored old sculptures, remounting them when this was possible. He also copied many sculptural elements according to the original. He restored the balcony placed at the first level of the Western Tower, the windows placed at the first level of the Mathew Palace’s Loggia (in present times these were eliminated during the restoration works performed between 1956-1968) as well as the square balcony of the Golden Room.

After the death of F. Schulcz, Imre Steindl who initially followed his forerunner continued the restoration works, but further he changed the restoration program based on a wrong hypothesis according to which Hunedoara should become a Royal Castle (as summer residence for the imperial family). Steindl executed increased heights at the level of Northern Palace, Western Tower, Southern Palace, conceiving in same time the shape of roofs that can be seen in present times, imposing roofs, the aim being to redecorate the whole assembly of artistic elements. Steindl modified the crenels of uncovered bastions in the northerb side, demolished all window frames and made them uniform not taking into account the existent ones, thus aiming to redecorate the whole assembly with artistic elements sculptured in Neogothic style. The redecoration was limited only at the façade of the Bethlen Palace.

In 1874 Steindl resigned because the budget approved for the monument of Hunedoara was not according to his plans. Thus, the Chamber of Deputies in Budapest, based on estimate drawn up by architect Wagner, entrusted the continuation of restoration works to the former buildings’ contractor of F. Schulcz, Piaczek Iuliu who concluded in a sad manner the restoration works at Hunedoara. He applied new mortar on all interior and exterior surfaces, removed all old sculptural ornaments, most part of it being rejected or transformed in masonry material (most of it can be recovered because in 1907 the removal was considered unjustified, most of it having a good preservation status and thus used to rebuilt the pretence. The Gothic Gallery of the Council Hall was modified, because it has been demolished and then rebuilt in a non-proper manner.

In 1876 the restoration works were entrusted to the architect Khuen Antal, an aristocrat by origin, who had an extraordinary appetite for the idea of restoring a historical monument. He finished the restoration of the gothic architecture in the Knight’s Hall, the upper inner level of the Mace Tower, the balconies of the Golden Room and the ones in the Western Tower.

Möler Istvan was appointed has been Chief Architect of the Corvins’ Castle in 1907. He continued the restoration of the monument following scientific principles and practicing archaeological excavations and wall face studies. He had clear intentions to eliminate the distortions of his forerunners. He restored the Gothic Arcade of the façade of the Western Palace and the façade of Matia Palace, using Arányi Lajos’s drawings.

In 1956 started another stage of the restoration works. The research and the project of the works were executed in the restoraion shop of I.C.S.O.R Company. This restoration stage was based on a very important finding according to which the Corvins’ Castle was built in many stages, for each of them corresponding a certain artistic and architectonic trend. The characteristic features of the monument in Hunedoara consisted in reunification in an unitary assembly of the elements of the gothic architecture in its three phases, the architectural elements of the Renaissance, the Baroque and the neogothic in the 19th century. The concept of the restoration was to not modify the architecture of the castle and to focus on the preservation and the restoration of specific elements of each stage of construction. The objectives pursued in this phase were: reinstating the gothic architecture of the Chapel, the Council Hall, the Northern Palace and partially the interior of the Bethlen Palace.

The basis of latest restoration works was the researches performed between 1955 and 1957 by the historian Oliver Velescu and the architects of the Historical Monuments’ Division (Architect V. Bilciurescu, Architect Stefan Bals, Architect Eugen Chefneaux). During this project there were interventions at the façade of the Northern Palace. The architects removed the 19th century closings, repaired the towers’ roof on the eastern and the southern sides, and repaired the interior and the exterior of the Capistrano Tower and the gothic gallery of the Council Hall, the Western Tower. They also performed strengthening works, finishing works inside and outside and repair and the electrical installations.

In 1997 the monument of Hunedoara has been included in the National Plan of Restoration, the project being accomplished by S.C. Remon Proiect S.R.L., its coordinator being the Architect Constanta Carp. The works concluded in strengthening works, electrical installations, heating systems necessary in creating a stable interior microclimate, remaking the finishing works inside and outside, cleaning and jointing the wall face as well as restoration and preservation of frescos or stone artistic components.