Stunning in their realism, his composition of houses, landscapes, sky and cloud made a Siddell exhibition a highlight of the art scene.
His early love of mountain climbing, where he earned the nickname "Spin", saw him return to the southern landscapes in 2000 to paint fiords, Milford Sound and snowcapped mountains, but he continued to return to his small bach at Karekare with his wife, Lady Sylvia Siddell, also a painter, who passed away in August.
He was so successful his work was bought by major public art galleries, and Siddells graced corporate board rooms and foyers as well as institutional collections. Generous to a fault, he would donate work for charities and fundraising.
In 1990, he was made a companion of the Queen's Service Order, then knighted in 2008 - the same year he was diagnosed with an incurable brain tumour.
In February this year, Random House published his book The Art of Peter Siddell. A retrospective exhibition of his life and work was later opened at Lopdell House.
He died at Mercy Hospice on Monday. He is survived by daughters Avril and Emily and three grandsons.