McCullough Mulvin are Grade 1 Conservation architects but combine this with skill at making cutting edge contemporary architecture. An ability to mix new and old like this is unique in Ireland, where conservation and new build are often at odds. The practice has a great deal of time for existing structures - their materiality and history, the freedom of unusual spaces they offer - and works to get the best out of them, exploring ways to open them up and allow new light and circulation routes through old walls. Old things are juxtaposed with new ones, making innovative projects that fully integrate old buildings (usually Protected Structures) and new architecture – such as St Mary’s Medieval Mile Museum in Kilkenny. This work is sustainable in nature and at the forefront of 21st century debate about the re-use of old fabric.