| Cassiobury House | |
|---|---|
 Cassiobury House (The County Seats of the Noblemen and Gentlemen of Great Britain and Ireland, by Francis Orpen Morris) | |
  Location of Cassiobury House in Hertfordshire | |
| Former names | Manor of Cashio |
| General information | |
| Status | Demolished |
| Type | English country house |
| Architectural style | Neoclassical, later renovated in the Gothic Revival style |
| Town or city | Watford, Hertfordshire |
| Country | United Kingdom |
| Coordinates | 51°39′54″N 00°25′08″W / 51.66500°N 0.41889°W |
| Construction started | 1546 |
| Completed | 1556 |
| Renovated | c.1677–80; 1805 |
| Closed | 1922 |
| Demolished | 1927 |
| Grounds | 693 acres (2.80 km2) |
| Design and construction | |
| Other designers | Grinling Gibbons, Antonio Verrio, Moses Cook Humphry Repton Jeffry Wyatville |
| Renovating team | |
| Architect(s) | Hugh May; James Wyatt |
| Other information | |
| Number of rooms | 56 |
| Website | |
| Cassiobury Park - house history | |
Cassiobury House was a country house in Cassiobury Park, Watford, England. It was the ancestral seat of the Earls of Essex. Originally a Tudor building, dating from 1546 for Sir Richard Morrison, it was substantially remodelled in the 17th and 19th centuries and ultimately demolished in 1927. The surrounding Cassiobury Park was turned into the main public open space for Watford.