According to the Gwynedd Archaeological Trust, the boathouse on the shore of the smaller Llyn Cregennen was built of stone 'with a slate roof and ridge titles' in the late 19th century. It measures 9 metres long by 6.5 metres wide, and 'the plan is one common to all three boathouses on the Cregennen property.' Llynnau Cregennen (NPRN 412902) are owned by the National Trust and are located three miles north east of Fairbourne, on the slopes of Cadair Idris.
Source: Gwynedd Archaeological Trust database, reference number 5663
M. Ryder, RCAHMW, 8th October 2018.