Salem was built as a schoolroom for Ainon Chapel and constructed in 1905 at the top of Cwmtawe Road, Penrhos, at the top of the hill leading down to the Ynys. Later, the building was used as an annex to Penrhos Primary School, before becoming a workshop and garage for a local haulage business. It was demolished and replaced with a new house.
Whilst sometimes labelled as Salem Chapel, instead of Salem Schoolroom, it was always a branch of Ainon Welsh Baptist Chapel, and the overall minister in charge would have been the Reverend in charge of Ainon.
The Llais newspaper had always included a round-up of happenings at local churches and chapels, even when these were not part of any particular story. Sometimes they advertised forthcoming events, and at other times who was preaching, or had preached there recently.
From the Labour Voice newspaper, January 21st 1921 reported on the reopening of Salem, calling it a chapel:-
SALEM CHAPEL TO BE RE-OPENED
Salem Chapel, Penrhos, a branch of Ainon Baptist Chapel was re-opened on Thursday. The Rev E.D. Lewis, Ystalyfera, officiated. The building was closed down some time ago for renovation purposes. The usual services will be held on Sunday next.
The South Wales Voice 25th February 1933 reported on the damp condition of Salem:-
Mr G J Rees, sanitary inspector, reported to the Ystradgynlais Council on Thursday last that he had received complaints of the damp condition of Salem Schoolroom, Cwmtawe Road, Penrhos, and added that he would report at the next meeting.