Many standard forms are available below. All forms are categorized into their respective departments.Starting March 1, 2022, all new subdivision and site plan applications must be submitted through the ePlan portal. Click here for the link to the ePlan portal. Our main focus is assisting you in finishing your sunroom construction project in Middlesex County, New Jersey. The purpose of this chapter shall be to provide rules, regulations and standards to guide land subdivision and site development in the Borough of Middlesex. The Office of Planning's primary responsibility is to prepare a comprehensive development plan for the County and to monitor its implementation.