Treath House and Garden Walls is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 22 June 1987. House and garden walls.
Treath House and Garden Walls
- WRENN ID
- dim-eave-moth
- Grade
- II
- Local Planning Authority
- Cornwall
- Constituency
- St Ives MP: Andrew George (LD)
- Country
- England
- Date first listed
- 22 June 1987
- Type
- House and garden walls
- Address
- Treath House and Garden Walls, Manaccan
- OS grid reference
- SW 762 261
- Coordinates
- 50.0933, -5.13018
- Source
- Historic England listing
Description
Treath House is an early to mid-18th century house, extended and remodelled in the late 18th century and again in the mid to late 19th century. It is constructed of shale rubble with granite sills and lintels, with cob to the first floor of the original rear section. The front has asbestos slate roofing, while the rest of the roof is covered with scantle slate, with brick chimneys over the gable ends. The house has an irregular U-shaped plan with three gabled wings set at right angles to the rear. Inside, there are a parlour to the left and right of the front, an original cross passage to the left, and a small room to the right of the cross passage. A mid to late 19th century staircase is positioned behind the left-hand parlour, with a single room-deep wing of the original house behind the staircase. A further small service wing with a fireplace is positioned behind the right-hand parlour, and a wide axial passage runs between the wings at the rear.
The west-south-west front is slightly irregular and features three windows. It has original circa late 18th to early 19th century 12-pane 2-light casements with some crown glass, although some ground-floor casements have been replaced. A circa late 19th century part-glazed door leads to a porch with shaped and pierced bargeboard over rustic posts. There is a narrow window to the room immediately right of the doorway, and a wide window with a 3-light casement to the right-hand parlour. The left-hand side wall has a tall 18-pane hornless sash window to the staircase, and several old 16-pane 2-light casements. A first-floor window on the left is an original circa early to mid-18th century window with wide glazing bars.
The interior retains fine, circa late 18th century Adam-style chimney-pieces in each parlour. Other interior features represent various periods, but the house hasn’t been significantly altered since the 19th century.
A wide rubble garden wall, topped with dressed stone slab coping, runs at right angles to the front and alongside the road. Further walls enclose a rectangular area to the left of the front, constructed from roughly coursed rubble, alongside a substantial section of cob walling with scantle slate and clay tile coping. Treath House is situated in an important position overlooking the Helford River.
Local climate
Treath House and Garden Walls receives an average of 870 mm of rain a year. This makes it wetter than 63% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 91% of listed buildings.
It experiences an average of 3 freeze-thaw cycles a year, fewer than 99% 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 0.2°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.
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- Detailed attributes — period, style, materials, features
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