William Wallen received comprehensive tutelage in the office of his father, John Wallen, who was an Architect and the Principal Surveyor in London in the 1830s. William probably completed his training in 1828; however, there is no evidence that he undertook any independent projects during the following ten years. By 1831, John Wallen, William Wallen and
William Beatson had formed a partnership that remained intact until 1836, when the firm ‘Wallen, Son and Beatson’ provided a substantial estimate for repairs to the fire damaged Christ Church in
Spitalfields. On 24 March 1836, by mutual consent, Beatson withdrew from the partnership. During the partnership, William appears to have gained some autonomy allowing him to also pursue his antiquarian and educational interests. In 1838, he appeared in Huddersfield, Yorkshire, becoming the town's only qualified architect. William's career flourished. His many projects included the building of six new churches: • 1838–40, St David, Holmbridge, near Huddersfield • 1842-3 St
John the Evangelist Church, Farsley, Bradford • 1843-5 St Luke's Church, Milnsbridge, Huddersfield, • 1844–6 Christ Church, Oakworth, Keighley, • 1845-7 St Nicholas, Whitehaven,
Cumbria (Cumberland). • 1845-8 St Paul's Church, Shepley, Huddersfield. Other Projects: • 1840 Report for Clarke-Thornhill family re. condition of roofs at Fixby Hall • 1843 National School and Master's House, Kirkheaton. • 1846 Riding School, Huddersfield. • 1848 Longley Hall Estate Office. • 1849 George Hotel, Huddersfield. (William Wallen and Charles Child) • 1851 Castle Hill Hotel. • 1852 Restoration of Holme Bridge Church. • 1853 Lecture Room, Aspley. This was Wallen's last project. He did not see its completion in 1854. The Italianate
façade of the George Hotel became Huddersfield's adopted architectural style as the town developed over following decade. Charles Child's role in the George Hotel project is disputed, being variously described as Wallen's clerk, contractor or contributing architect. Child completed the Aspley Lecture Room. == Art and publication ==