A 14thc. tower survives from an earlier chapel, the building itself is the work of Sir Henry Trecarrell in 1511-24, entirely of granite, and externally highly ornate.
The font base is the only Romanesque feature.

St Mary Magdalene was first built between 1295 and 1319, by the burgesses of Launceston as a public chapelry to St Stephens Priory, and in 1338 it was elevated to parish church status, with the dedication of its high altar. Between 1511 and 1524 it was rebuilt by Henry Trecarrell, with the exception of the 14thc. tower.

The Parochial History (III, 1870) states that "the font is of Polyphant stone; it has been stripped of its ancient ornament of heads and geometrical figures by recent dressing". This perhaps implies that the font was of a Romanesque type (such as at St Thomas, Launceston), as the base would suggest; and that in its present form the bowl is a merciless Victorian bowdlerization. But whence came a Romanesque font, which appears to predate the earliest chapel of this site? Either it was made in the 14thc. as an inexact copy of the font now at St Thomas's, but then in St Stephen's Priory, St Mary's mother church (the base differs from this font in its use of animal heads and lack of corner motifs, but has the same flattened cable moulding); or it was taken from the Castle Chapel after the Reformation, this being the only other possible local source. But in the early 1900s, as Sedding informs us, the base, the only Romanesque part of the present font, was lying loose at the W end of the N aisle, upside-down and roughly hollowed out. Sedding's verdict was that "there is no evidence to show that the Norman base ....belonged to this church", and certainly the present bowl does nothing by its form and dimensions to corroborate the Parochial History (being cup-shaped and completely plain, and measuring h. 0.45 m, diameter at top 0.66 m at bottom 0.43 m, circumference at top 2.24m, internal diameter 0.5 m, diameter 0.27 m, wall of bowl 0.08 m thick, lead-lined). I concur with Sedding in seeing the font as post-Reformation and the base, on which it was placed some time this century, as Romanesque.
Dating: first half of 12thc.