Streetworks by utility companies and developers
Works by developers
These requirements also apply to developers.
Existing agreements to carry out highway works as part of the development, the granting of planning permission, or if there isn't a need to get planning permission, does not mean you are exempt from needing a licence before carrying out works in the highway and you must comply with the conditions of that licence.
If you are granted a licence for highway work you are not exempt from any planning or building regulations requirements which may exist.