Digswell House is a Grade II listed Mansion erected c. 1805-7, by Samuel Wyatt for the Honourable Edward Spencer Cowper, who lived there for some years. It is situated in the Knightsfield area of Welwyn Garden City in the county of Hertfordshire and long predates the building of the town. The current house was erected a little eastward of the site on which its predecessor had stood and was built as a commodious country gentleman's home, in an architectural style that can best be described as neoclassical. A portico, with four massive Ionic columns, on the south front is its most impressive external feature.
An old manor house west of the present-day Digswell House was built by Sir John Peryent in the early 15th century. The old manor house was subsequently inhabited by the families of Peryent, Horsey, Sedley and Shallcross. Capability Brown created some of the landscape work at Digswell between 1771 and 1773.
The mediaeval manor house was purchased in 1785 by George Clavering-Cowper, 3rd Earl Cowper and as it was in poor condition was then demolished in 1805 to make way for new mansion.
The house was occupied by Henry Pearse Esquire a West India Merchant with his wife Mary and daughters Mary Louisa, Julia Charlotte, Alice Jane and sons Cosmo Brice and Ernest Charles and a full house of staff are shown in the 1851 census. He also resided at No. 8, Finsbury-place South, in the city of London. He was later declared bankrupt on 17 June 1854.
The house was owned by Phoebe Tatham the wife of William Smith Brown. Phoebe Tatham had inherited wealth from Duncan Dunbar following his death when still a bachelor in 1862. Dunbar had been one of the largest shipping magnates in the Commonwealth having built up the Dunbar Line of trading and convict ships. Phoebe was his niece, the elder daughter of Dunbar's sister Justina and her husband, Poplar surgeon Christopher Tatham. William and Phoebe had eight children. Phoebe died at Digswell 23rd February 1891 and William died 31st December 1891 at Portsea Island.
At this time the house was owned by the Aclands who gave over its use during the first World War Digswell House served as the Number 5 Australian Auxiliary Hospital and nursing home for wounded Australian Soldiers though Belgian and British Soldiers also stayed there. It was staffed by the Red Cross from local families. The grounds of Digswell house provided a centre for sports for those soldiers who could compete as can be seen in photographs from this period. A letter published in 1917 sums up the situation at the time.