Incline, Drumhouses and Counter Balances ('A' Incline) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 4 November 1999. Drumhouse.

Incline, Drumhouses and Counter Balances ('A' Incline)

WRENN ID
dreaming-steeple-briar
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
4 November 1999
Type
Drumhouse
Address
Incline, Drumhouses and Counter Balances ('A' Incline), Gilfach Ddu, Caernarfon, Llanddeiniolen
OS grid reference
SH 587 603
Coordinates
53.12112, -4.112
Source
Cadw listing

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

Description

The 'A' Incline features drumhouses constructed from local rubblestone and slate slabs, with slate being the predominant material. Each drumhouse has a gable-ended graded slate roof, although drumhouse 2 is in poor condition with several missing slates. Inside, each drumhouse retains a winding drum and cabling, and the double track with rails on the incline is largely intact. The lower drumhouses, numbered 1 and 2, include brakesman's cabins that are well-built and equipped with fireplaces. Drumhouse 2 also has an adjoining office with a squint window for monitoring approaching wagons. A stone-walled path from Dinorwic to Llanberis crosses the incline via a cast-iron girder bridge. Additionally, the wall along the southwestern side of the track features heavy slate slabs that are cantilevered out to provide shelter for workers managing the wagons.

Local climate

Incline, Drumhouses and Counter Balances ('A' Incline) sits in one of the wettest parts of the UK, with an average of 1,360 mm of rain a year. This makes it wetter than 96% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 40 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 22 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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