ᐅ Access path to chimney via roof ladder

Hello, in a new build, a chimney was installed that protrudes relatively centrally from the roof.
Maintenance openings are planned in the basement.
Is it necessary to have a fixed walkway, for example from a roof window or the eaves, using roof ladders or similar? Who is responsible for inspecting or approving this?

For all questions, the chimney sweep is responsible. He needs access to the chimney—either over the roof with roof anchors or through a cleaning hatch in the attic (the simpler and more cost-effective option).