Later life
Although he remained the Head Gardener at Chatsworth until 1858, Paxton was also able to undertake outside work such as the Crystal Palace and his directorship of the Midland Railway. He worked on public parks in Liverpool, Birkenhead, Glasgow, Halifax (the People's Park) and the grounds of The Spa, Scarborough. In October 1845 he was invited to lay out one of the country's first municipal burial grounds in Coventry. This became the London Road Cemetery, where a memorial to Paxton by Joseph Goddard was erected in 1868.
Between 1835 and 1839, he organised plant-hunting expeditions, one of which ended in tragedy when two gardeners from Chatsworth sent to California drowned. Tragedy also struck at home when his eldest son died.
In 1850, Paxton was commissioned by Baron Mayer Amschel de Rothschild to design Mentmore Towers in Buckinghamshire. This became one of the greatest country houses built during the Victorian Era. Following the completion of Mentmore, James Mayer de Rothschild, one of Baron de Rothschild's French cousins, commissioned Château de Ferrières at Ferrières-en-Brie near Paris to be "Another Mentmore, but twice the size". Both buildings still stand today.
Paxton also designed another country house, a smaller version of Mentmore, at Battlesden near Woburn in Bedfordshire. This house was bought by the Duke of Bedford thirty years after its completion, and demolished, because the Duke wanted no other mansion close to Woburn Abbey.
In 1860, Paxton also designed Fairlawn, 89 Wimbledon Park Side, for Sir Edwin Saunders, Queen Victoria's dentist.
Paxton was honoured by being a member of the Kew Commission, which was to suggest improvements for Royal Botanic Gardens, and by being considered for the post of Head Gardener at Windsor Castle.
On 17 March 1860, during the enthusiasm for the Volunteer movement, Paxton raised and commanded the 11th (Matlock) Derbyshire Rifle Volunteer Corps.
Paxton became affluent, not so much through his Chatsworth employment, but by successful speculation in the railway industry. He retired from Chatsworth when the Duke died in 1858 but carried on working at various projects such as the Thames Graving Dock. Paxton died at his home at Rockhills, Sydenham, in 1865 and was buried on the Chatsworth Estate in St Peter's Churchyard, Edensor. His wife Sarah remained at their house on the Chatsworth Estate until her death in 1871.