From 1855 to 1879 Philip Henry Delamotte was a professor of drawing and perspective at King's College, London, then became a professor of fine art there until 1887. Delamotte also taught drawing to members of the royal family and was a photography instructor at the Photographic Institution, London.
Philip Henry Delamotte died on 24 February 1889 at the home of his son-in-law Henry Bond in Bromley.
On 4 August 1846, at Paddington, Philip Henry Delamotte married Ellen Maria George, a farmer's daughter. The couple had a son and five daughters, the fourth of whom - Constance George - married Henry Charles Bond in 1887.