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I am a solicitor in Scotland. Thanks for your question. Does the developer already have a right over the land by virtue of the land he owns? If not he will need a right of servitude access to lay the pipes, connect to the sewer and for future repair and maintenance. He can’t just use land he has no rights over. I hope that helps. Please leave a positive rating so that JustAnswer credits me for helping you today.
You can sue him in court to uninstall the work and reinstate the property to what it was before he interfered with it. However if there is a threat that he will do this you can go to the court now and seek an interim interdict stopping him from interfering with the land to start with. A local court solicitor with some knowledge of land law should be instructed to take this forward for you. I hope that helps. Please leave a positive rating so that I am credited by JustAnswer for helping you today.