Idially very noisy work she be done between 8am and 6pm Monday to Friday, 8am to 1pm Saturday and not on Sundays.
This is the recommended time frame for very noisy work, it doesn't mean all work must stop outside those times. It would be unreasonable to carry out any noisy work after 8pm if it can be avoided.
This is not set down in law, but is the guidelines council use. The occasional Sunday would be acceptable but not if it was a regular occurrence.
To protect yourself, let your neighbour know this work is essential for safety reasons, tell them when it will start and when you hope it will be finished.