The Old Pest House is a Grade II listed building in the East Hertfordshire local planning authority area, England. First listed on 12 April 1973. House. 4 related planning applications.

The Old Pest House

WRENN ID
narrow-merlon-wagtail
Grade
II
Local Planning Authority
East Hertfordshire
Constituency
Hertford and Stortford MP: Josh Dean (Lab)
Country
England
Date first listed
12 April 1973
Type
House
Address
The Old Pest House, Byde Street, Hertford, SG14 3BA
OS grid reference
TL 320 132
Coordinates
51.8021, -0.08568
Source
Historic England listing

Also on this page: sale history · EPC · related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

This is a mid-18th century house built as an isolation hospital, with later 19th-century alterations and embellishments. It is constructed of red brick in a Flemish bond, with an old tiled roof featuring brick parapeted ends and half-Dutch gables at the rear. The building has elaborate brick chimneystacks with moulded bands and oversailing caps. A central, raised, tile-hung flat-roofed rear extension sits above the lower slope of a low, swept-slip roof.

The first floor windows are 3-light and 2-light small-panel iron casement windows with projecting frames and moulded embattled heads raised on cut profiled corner brackets. A plat band runs at first-floor level. The ground floor has two projecting moulded mullion and transom oriel bays with small-paned iron casements, beneath old tile lean-to roofs with curved plastered spandrels. The central entrance is a hardwood door with nine panels, the upper three glazed with a leaded light, and is covered by a tiled open-gabled hood raised on braced brackets. Small projecting windows are visible on the north gable; the south gable has a modern hip roof. Three attic dormers are present at the front, the outer two with half-hipped roofs, and the central one with a hipped roof, all featuring small-panel iron casements.

The interior has not been inspected.

The Old Pest House was built in 1763 as an isolation hospital against smallpox by Thomas Dimsdale, who lived at Port Hill House. The plot adjoined his garden, and he had purchased an extensive estate in the area; Port Hill House was known as 'The Inoculation House'.

Local climate

The Old Pest House sits in a drier-than-average part of the UK, with an average of 710 mm of rain a year. This makes it drier than 88% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 84% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 55% of listed buildings. Of these, 16 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 13 transactions since 1996
  • Related listed building consents — 4 applications
  • Detailed attributes — period, style, materials, features
  • Flood risk assessment
  • Radon risk assessment
  • Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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