It is a Grade II-listed building; its 1975 designation noted both the reputation of its architect and its impressive High Victorian style with continental influences.[6]
It is constructed in red brick in the Early English style and has a slate roof. Inside Holy Trinity is a screen brought from St Philip, Dalston after that church was damaged by bombing in December 1940. The post-war east window of the church has glass by A. F. Erridge.[6][7]
The Clowns' Church
Holy Trinity is known as the Clowns’ Church for the annual Clowns International service held on the first Sunday in February in honour of Joseph Grimaldi and deceased clowns. The service was established in 1946/7 at St James's Episcopal Chapel in Pentonville Road, where Grimaldi is buried (now Joseph Grimaldi Park).[8] It moved to Holy Trinity in 1959 after St James's was deconsecrated.[9][10][11] The service is attended by clowns in full costume and is usually followed by a performance for members of the public.[9]
The vestry of Holy Trinity Church is home to the Clowns Gallery-Museum, which includes the Clown Egg Register.