Otter House at Ty Iocws is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 8 February 1999. Circular house.

Otter House at Ty Iocws

WRENN ID
western-turret-thrush
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
8 February 1999
Type
Circular house
Address
Otter House at Ty Iocws, Abererch, Pwllheli, Llannor
OS grid reference
SH 379 367
Coordinates
52.90381, -4.41129
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Otter House at Ty Iocws is a circular building that sits on a brick plinth, adapting to the slope of the ground. The structure features a lower section made of closely spaced railings with a gate on the north side. Above this is an upper section of white-painted latticed battens, topped with a moulded cornice, and a conical roof covered in zinc sheeting. Inside, there is a smaller circular timber house constructed from vertical boards, which has two round-topped openings and a similar conical zinc roof. This inner structure is suspended from the cross tie beam of the main roof and is situated over a circular moat lined with zinc. The interior of the smaller house is divided across its diameter by a vertical partition.

Local climate

Otter House at Ty Iocws sits in one of the wettest parts of the UK, with an average of 1,670 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.

It experiences an average of 4 freeze-thaw cycles a year, fewer than 98% 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.

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