He established a practice in Llandaff, Cardiff where he became the diocesan architect. Many of his major commissions were restoration works, most famously for Llandaff Cathedral (1843-1869). And after his death on 13 October 1886 Prichard was buried on the south side of that cathedral.
Llandaff Cathedral, Llandaff (1843–1869) restoration.
Prichard Bridge, Llandaff (c1880)
Nazareth House, Cardiff (1851) commissioned by the Marquess of Bute
Church of Street Swithin, Ganarew (1850)
Holy Cross Church, Cowbridge (1850–1852) restoration. Street Michael"s Church, Cwmafan (1851).
The Church of Street Julius and Aaron, Llanharan (1856–1859) restoration. Ettington Park, near Stratford upon Avon (1858–1862) restoration.
Church of Street John, Llandenny (1860-1865) with John Pollard Seddon
Street Margaret"s Parish Church, Roath (1870) commissioned by the Marquess of Bute
Street Crallo, Coychurch (1871) restoration
Church of Steamship Illtyd, Gwynno & Tyfodwg, Llantrisant (1874) restoration
Street Catherine"s Church, Baglan (1875–1882) restoration
Street Thomas a Becket"s, Monmouth (1876)
Street Mary"s Nolton, Bridgend (completed 1877) build
Street Mary"s on Chapel Hill, Tintern, Monmouthshire (1863–1868) restoration.