In the early 70s Nicholas set up his own practice and attracted adventurous clients looking for an alternative to the established firms. The results are important, but little-known buildings, including a handful of houses, the Christchurch Working Mens Club and the community of commercial studios at 75 Peterborough St for developer Tom Kain.

Maurice Mahoney wrote in the 1977 CSA News,

Nicholas Kennedy was for five years a most valuable member of the Council of the Canterbury Society of Arts. He continued the good tradition of architect members of the council by serving on the building committee and giving most helpful advice on the gallery and its furnishings
He designed our beautiful pottery and display stands. He was an expert in the hanging of exhibitions and helped with some of the CSA’s best shows His advice and judgment in aesthetic matters was most respected But Nicholas Kennedy was above all an architect and one of the very best of his generation. Four years ago he started in private practice, and in a number of excellent designs, especially houses, demonstrated his creative ability.
For many years Nicholas suffered from an illness that became progressively worse. Despite this severe disability he was always cheerful and confident. In so short a time it is astounding how much he achieved of such a high quality.