Phineas lived for ten years after the Sovereign of the Seas was launched.

In the burial register of the parish of Chatham it is recorded, "Phineas Pett, Esqe.
and Capt., was buried 21st August, 1647."[33] Sir Peter Pett was almost as distinguished as his father.

He was the builder of the first frigate, The Constant Warwick.

Sir William Symonds says of this vessel:--"She was an incomparable sailer, remarkable for her sharpness and the fineness of her lines; and many were built like her." Pett "introduced convex lines on the immersed part of the hull, with the studding and sprit sails; and, in short, he appears to have fully deserved his character of being the best ship architect of his time."[34] Sir Peter Pett's monument in Deptford Old Church fully records his services to England's naval power.
The Petts are said to have been connected with shipbuilding in the Thames for not less than 200 years.

Fuller, in his 'Worthies of England,' says of them--"I am credibly informed that that mystery of shipwrights for some descents hath been preserved faithfully in families, of whom the Petts about Chatham are of singular regard.