The new Humanities Research Building in Trinity College, 1,300 sq m area, The Long Room Hub, is a platform for the 21st century Irish university sector focus on achieving world-class status, the latest phase in a built process which commenced with the Ussher Library and continues as an on-going Masterplanning and Feasibility study by McCullough Mulvin on behalf of Trinity College Dublin, a Protected Structure, for the library complex.The site for this project is in Fellows Square at the heart of the most historic part of Trinity College; the rectangular building form- four stories high with higher rooflights penetrating the volume to form shafts of light- perches on the end of the Arts Block, closing the square and framing the view to Front Square over the roof of the 1937 Reading Room. The building has been designed to accommodate a team working on the digitisation of the treasures of Trinity’s Old Library: a vital component of the plan to open the significant Manuscript and Early Printed Books collections of the Library to the world. The building also houses research facilities for post-doctoral students, offices for international Visiting Research Fellows, seminar rooms and space for lectures and conferences. McCullough Mulvin provided full architectural services in accordance with the Standard Conditions of Engagement (Technical). McCullough Mulvin Architects have worked with TCD on developing Masterplanning and Feasibility studies for the library complex. This study is ongoing and the Long Room Hub is the latest part of that built process which commenced with winning an international design competition for the Ussher Library TCD and continues to date. This building had a very tight ‘build’ programme driven by funding imperatives which were delivered on time and to budget. For a large university organisation our role requires careful and co-ordinated communication between multiple stakeholders and user groups in a live campus context. A Façade Consultant, Acoustician, Fire Consultant, Archaeologist and PS(DP) were part of the team and extensive consultation on Disability Access took place with TCD’s Universal Access Committee, Landscape Specialists and Sustainability Committee. McCullough Mulvin are Grade 1 Conservation Architects and this was of the highest significance in achieving Planning Permission without an appeal in one of the most sensitive historic environments in the country.