St Mary's House is a Grade II listed building in the Pembrokeshire Coast National Park local planning authority area, Wales. First listed on 6 April 1977. House. 3 related planning applications.

St Mary's House

WRENN ID
nether-mortar-mist
Grade
II
Local Planning Authority
Pembrokeshire Coast National Park
Constituency
Mid and South Pembrokeshire MP: Henry Tufnell (Lab)
Country
Wales
Date first listed
6 April 1977
Type
House
Address
St Mary's House, 10 St Mary's Street, Tenby
OS grid reference
SN 134 003
Coordinates
51.67081, -4.69893
Source
Cadw listing

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

Description

St Mary’s House is a house dating from the 18th century. It is constructed with a painted roughcast front, rising to four storeys and two bays wide. The roof is hipped and covered in slate, with red brick side stacks. The upper floors have twelve-pane sash windows. On the first floor, a twelve-pane sash window is set slightly further to the left than the windows above, positioned over an arched doorway. A large, two-storey canted bay window is situated on the right-hand side, featuring four-over-sixteen-over-four-pane glazing. A six-panelled door is accompanied by a radiating-bar fanlight and is accessed via three steps with wrought iron rails. The north end wall is clad in slate, while the south end is roughcast.

Inside, the staircase features a 19th-century bulbous newel post, a thin rail, and a closed string. A thin cornice is present in the front room, and an elliptical arched recess can be seen. In the rear room, a rubble stone elliptical arch on the south wall is believed to be the remains of the former kitchen fireplace.

Local climate

St Mary's House sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 91% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.

It experiences an average of 5 freeze-thaw cycles a year, fewer than 97% of listed buildings. Of these, 1 follows 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 — 5 transactions since 1998
  • Related listed building consents — 3 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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