Treween Farmhouse is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 22 November 1960. Farmhouse. 4 related planning applications.

Treween Farmhouse

WRENN ID
sunken-cobble-raven
Grade
II
Local Planning Authority
Cornwall
Constituency
North Cornwall MP: Ben Maguire (LD)
Country
England
Date first listed
22 November 1960
Type
Farmhouse
Address
Treween Farmhouse, Altarnun, PL15 7RD
OS grid reference
SX 220 820
Coordinates
50.61065, -4.51682
Source
Historic England listing

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

Description

Treween Farmhouse is a building likely dating from the late 16th or early 17th century. It is constructed of stone rubble and cob, with some slate hung on the front, and the lower end on the right rebuilt in the 19th or 20th century. The roof is slate with gable ends, a lower roof over the lower end on the right with a half-hipped end, and a hipped end to the front wing. There are stone rubble end and axial stacks, with the axial stack featuring a 17th-century moulded granite cap, and a stone rubble rear lateral hall stack. The original plan is uncertain, but it was probably a 3-room and cross passage plan built down a slope, with the ground rising to the left. The lower end on the right is unheated. The hall is heated by a rear lateral stack, with an adjoining smoking chamber and stair turret to the rear on the higher left-hand side. The inner room to the left is larger than usual and is heated by an axial stack backing onto the cross wall between the hall and inner room. A second fireplace, remodelled in the 19th century, is in the end wall, suggesting the inner room was divided into two rooms. The entrance has been altered, and the screen on the higher side of the putative passage has been removed. It appears the original passage was probably to the right of centre and may have been a cross passage or later blocked by the hall smoking chamber. Possibly in the 18th century, an unheated, single-room plan wing was added to the front of the passage and the front of the lower side of the hall. There is an outshut, likely remodelled in the 18th century, to the rear of the inner room, and a circa 19th-century outbuilding incorporated into the house on the right. The asymmetrical two-storey front has a 2:1:1 window arrangement with a two-storey projecting wing to the right of centre. There are two roof levels, with a higher roof over the putative passage, hall, and inner room, and the front wall of the hall breaks forward slightly between the cross wall of the inner room and the projecting wing. The ground floor has a 3-light casement and a 20th-century glazed door lighting the inner room, a 19th-century 3-light casement to the hall, and a 3-light casement to the lower room. Another 19th-century 3-light casement with a 19th-century door, featuring dressed granite reset at the top of the jambs and an unmoulded granite lintel, is located on the ground floor of the wing. The first floor has four 19th-century 2 and 3-light casements. Incised initials “DV 1764” appear on the rear of the hall stack. The projection adjoining the stack has a blocked opening and has been truncated in height, likely remnants of a smoking chamber. Inside, hollow chamfered granite lintels and jambs are present to the fireplaces heating the inner room and hall. A stone newel stair is located in the turret to the rear of the hall, with the upper treads cased with timber. A 17th-century chamfered timber square-headed frame is visible to the door leading from the inner room to the outshut on the rear. The roof structure was replaced in 1947.

Local climate

Treween Farmhouse sits in a wetter-than-average part of the UK, with an average of 1,030 mm of rain a year. This makes it wetter than 83% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 86% of listed buildings.

It experiences an average of 16 freeze-thaw cycles a year, fewer than 84% of listed buildings. Of these, 7 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 — 8 transactions since 1995
  • 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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