An extensive collection, chiefly consisting of estate plans created in or for the Howard estate office or for members of the Howard family or various land agents etc., early 17th century - 20th century. Some of the plans tie up with field-books, surveys etc. held elsewhere in the Howard of Naworth Papers. There are also plans concerning rail, road and water communications, industries, in particular the coal industry, and water-works. Most plans are manuscript but the collection also includes some printed plans, notably Ordnance Survey plans of various scales and dates and plans in sale catalogues. Some of these printed plans bear manuscript annotations.
Geographical range: (For fuller details of the geographical range of the collection see the general description of the Howard of Naworth Papers under Administrative etc. history.)
- Cumberland: The bulk of the plans relate to Cumberland, especially to the Barony of Gilsland and near-by manors. Of particular note are a series of estate plans of manors in the Barony of Gilsland drawn up for Lord William Howard in the early 17th century (HNP C713/1, 1A, 2- 13). For a published edition of a related field-book (various copies of which survive: HNP C188/1, 1A and 2) see description of main series of Cumberland deeds and papers.
- Northumberland: There is also a series of plans relating to Northumberland. Most of these are centred on the Morpeth area. They include (HNP 1967 deposit) a volume of early 18th century survey plans drawn by William Lambert and covering various sections of the Northumberland estate, some coloured and complete with decorative cartouches or pictures, others unfinished.
- Other areas: Odd items relate to Weardale in County Durham, Grimsby in Lincolnshire, Hackness and Hutton Buscel in Yorkshire and the British Isles in general.