You definitely do need permission for the Heaver conservation area. See page 77 of this: [url]file:///C:/Users/Lenovo/Downloads/Heaver_CAAMS_part_two.pdf[/url]. I know a fair bit about it because I live in the adjacent conservation area and it's the same with my house. The document is actually really helpful and mentions suppliers the Council can recommend to replace things such as the front railings. This is part one of the same document if you are a local history nerd like me
Good luck with the project.