However, the building of tenshu gradually became less common for the following reasons: the building of tenshu without permission was prohibited following the enactment of Buke shohatto (Laws for the Military Houses); the building of tenshu became unnecessary; some tenshu were destroyed in natural disasters; and the construction of tenshu put too much of a burden on a domain's finances.
しかし江戸時代には武家諸法度発布による天守などの無許可造営の禁止、必要ないとのことでの中止、災害による亡失、藩の財政難という経済的な理由等により次第に建築されなくなった。