Paul R. Davis describes the St. David's as 'A small medieval church located within a sub-circular churchyard on a hilltop near Builth Wells. Documentary references to Landewycum appear in 1154, though the masonry is probably later. It comprises a chancel, nave and west tower, and was heavily restored in 1847.'

CADW records that 'a church here is mentioned in the Taxatio of 1183' and that it has an 'altered medieval tower possibly C13-C14 presumably cutdown for present pyramid roof, medieval chancel, but nave rebuilt in 1847 by Joshua Daniels. Further work in 1913 may include the E window and chancel arch.' CADW's technical description of the church is as follows: 'rubble stone with slate roofs and coped shouldered gables. W tower, nave and chancel. Tower is plain with hipped overhanging slate roof with swept eaves. Tiny 2-light bell-openings to N only with C19 cusped heads and louvres. N side also has ground floor small single light recessed in crude segmental pointed surround. W front and S side have no openings. Nave of 4-bays with buttresses and Y-tracery sandstone ashlar 2-light windows with stone voussoirs. N side has 3 windows with sandstone hoodmoulds and gabled porch in first bay with coped gable, pointed chamfered entry and low angle buttresses. Double oak gates. Inner door with stone voussoirs to segmental-pointed head. C19 board door. Nave S has only 2 windows, in second and fourth bays, similar tracery but no hoodmoulds. Chancel is lower with similar coped gable, cross-finial and ashlar gabled shoulders. C19 3-light E window of red sandstone early C20 with 3 lancet lights, 2 tiny trefoils in spandrels and hoodmould. N side has 2 recessed chamfered tiny lancets and affixed memorial of 1834. S side has medieval chamfered lancet and pointed oak-plank door to left in chamfered rubble stone surround.'Whilst the interior is described as: 'Plastered walls, nave with boarded roof of 4 bays, arch-braced late C19 collar trusses with metal plates to collar and metal-rod ties. W wall apparently cut back at upper level. Moulded pointed chancel arch of two orders, inner arch dying into piers, outer arch chamfered on moulded capitals and with hoodmould. Similar stonework to reveal of E window. Chancel has late C19 or early C20 oak open arch-braced rafter roof, mouldings only over sanctuary. Fittings: medieval crude deep font, tapered square with chamfered angles on off-centre squat round pier with round base. Attractive octagonal timber pulpit possibly earlier C20 with close set balusters to upper panels, moulded cornice and panelled base. Eagle lectern. Earlier C20 altar rails, timber with flower ornament. Later C19 pine pews. Monuments: chancel N 2 colour neo-classical monument with fluted pilaster, cornice and curved top and bottom, centre panel with crude sarcophagus plaque to William Powell of the Noyadd (d 1826), signed by Price of Builth. White marble neo-Grec plaque to Jane Powell of New Hall (d 1849). Various lettered floor slabs in chancel including Thomas Price of Doldlinwyod (d 1787).'
It has been Grade II listed 'as a restored church with medieval tower and chancel, picturesquely sited in circular churchyard.'
Sources: Paul R. Davis and CADWs database of listed buildings
29/06/2018