Tirionfa, Llandderfel is a former rectory, built to serve the incumbant of Llandderfel parish in 1826, at a cost of £950. It is situated some 130m north of St Derfel's Church (NPRN 43870), and was originally known as 'Bryn Derfel'. The house is a Grade II listed building and is medium-sized, of two-and-a-half storeys. It is built of local slatestone rubble, with slate roofs and two squat axial chimneys, centrally-placed. has a simple interior with moulded architraves and panelled doors; panelled reveals and shutters to the ground floor rooms. The house is currently a nursing home.

Sources include:
CADW listed buildings database.

N Vousden, RCAHMW, 3 July 2012