In 1962, courtesy of the Museum Act (Northern Ireland) 1961, it was renamed as the Ulster Museum and was formally recognised as a national museum. A major extension constructed by McLaughlin & Harvey Ltd to designs by Francis Pym who won the 1964 competition was opened in 1972 and Pym's only completed work. It was published in several magazines and was until alteration the most important example of Brutalism in Northern Ireland. It was praised by David Evans for the "almost barbaric power of its great cubic projections and cantilevers brooding over the conifers of the botanic gardens like a mastodon".