His built works included villas at Cardoness (1828), for Sir David Maxwell, Baronet, and
Glenlair,
Corsock (1830), home of
mathematician and theoretical physicist
James Clerk Maxwell. In Dumfries, Newall built the
Assembly Rooms (1825), several commercial buildings including offices for his own use on the High Street, and several private houses including
Moat Brae (1823), whose gardens, a childhood haunt of author
J. M. Barrie, were the inspiration for
Peter Pan. Newall remodelled a windmill in
neoclassical style to serve as the town observatory, which later became
Dumfries Museum. He designed St Mary's Church and clergy house at New Abbey built in 1824. He also designed several
Gothic churches, including those at
Buittle (1818–19),
Anwoth (1826–27), and
Kirkpatrick Durham (1849–50). His
Greek Revival-style villas were admired by
J. C. Loudon, and Hannahfield (later called Ladyfield West), on the
Nith south of Dumfries (the only Category A-listed building by Newall, but which has sadly not 'enjoyed' statutory protection) featured in his
Encyclopaedia of Cottage, Farm, Villa Architecture (1834). ==Gallery==