In about 1868 he moved to join his three elder brothers in
Glasgow and was articled to Salmon Son & Ritchie. In 1875, he moved to
London, joined the
Architectural Association and began work as an assistant to
Richard Coad - who recommended MacLaren to the
Royal Academy Schools in January 1876. In 1884, MacLaren went into partnership with Coad, but also began to develop his own practice, which he eventually established as an independent venture in late 1887 at 21 King William Street, London, having just won a competition to design Stirling High School and the patronage of Sir
Donald Currie MP. That year, he was also commissioned to design a hotel for the
Canary Islands Company at
Las Palmas, a stopping place for Currie's Castle route, but became ill with tuberculosis. In various projects for Currie, he developed a strong architectural style that influenced Charles Rennie Mackintosh's designs for Windyhill (
Kilmacolm) and the
Hill House. His pupils included Sir
Robert Lorimer. In 1886, while working on Ledbury Court, Herefordshire, MacLaren encountered the country chairmaker
Philip Clissett at nearby
Bosbury. The meeting resulted in an iconic ladderback chair that furnished many Arts and Crafts establishments, including the meeting room of the
Art Workers Guild, and inspired
Ernest Gimson to learn chairmaking from Clissett himself. ==Illness and death==