Benllech's Congregation, or cause, was established in 1900 and the chapel built at that time. This chapel is built in the Arts & Crafts Style, with perpendicular Gothic windows typical of that date, and a long-wall entry plan. Benllech was designed by architect Richard Davies of Bangor (G.Jones,'Capeli Mon', p.45). There is a fairly simple platform pulpit at one end of the building and a series of arched ribs supporting a plain ceiling flat above the centre of the ribs.
