He built Kochi-jo Castle on Mt. Odakasa on the plain of Kochi as the center of administration by inviting Tsunaie DODO, who was a master-less samurai after the Battle of Sekigahara, to serve as magistrate with 7,000 koku, and completed the castle town in 1603.
また高知平野内の大高坂山に統治の中心拠点として高知城を築城し（奉行は関ヶ原の戦いの後浪人となった百々綱家を7000石で招聘、慶長8年（1603年）完成）、城下町の整備を行った。