Post Office – Londonderry, New Buildings – Opening Hours & Branch Details Post Office occupies a convenient site at 3 Duncastle Road, approximately a 3.32 mile drive south-west from the centre of Londonderry (a few minutes walk from Newbuildings Primary School). This branch is situated in a convenient location for patrons from Ballougry, Prehen, Newbuildings, Rossnagalliagh, Primity, Dunhugh, Ballyore and Magheramason. 8:00 am to 9:00 pm are its business times today (Friday). This page will supply you with all the information you need about Post Office Londonderry, New Buildings, including the working hours, location details, customer feedback and further details.