Construction of the new castle in the new capital was considered an important project--The head of Zogusho was given Junior Second Rank, as equivalent to its government post, which was the highest among all ministers, while the head of the Ministry of Central Affairs ranked Senior Fourth Rank, Upper Grade, which was the highest among the statutory eight ministries; besides, the head of Zogusho was appointed among military clans like the Otomo clan, as their ability to supervise the laborers mobilized for the construction project was counted on.
八省の卿のうち、最も高い中務卿は正四位上であるにも関わらず、造営卿の官位相当が最高で従二位とされ、また工事に動員された人士の監督のために造宮卿には大伴氏などの軍事を司ってきた氏族より任命されるなど、遷都に際して新しい宮殿の造営を重視していた。