During World War I, on 24 August 1916, the site was hit overnight by a bomb from a German Zeppelin airship, which extensively damaged all six shops and two adjacent houses (1 and 3 Southvale Road).

On 21 November 1924 the church's parish hall committee discussed employing Charles Canning Winmill (1865–1945), who had recently retired from the London County Council in order to pursue private work after 31 years of service in the architects' department, where he was responsible for social housing and fire stations.

On All Saints' Day (1 November) 1927 a service of dedication was held on the site, and in December 1927 work began on clearing the wartime debris.

Winmill was strongly influenced by the Arts and Crafts Movement, led by William Morris and the architects Philip Webb, Richard Lethaby and Charles Voysey.

One storey entrance porch has double doors in pointed arch doorway in chamfered stone surround beneath dentil eaves.

[8]On 29 September 1928 the parish hall was blessed by the Bishop of Woolwich, Dr William Hough (1859–1934), with a dance in the evening with 200 people and music supplied by the Granville Orchestra.

[9] The four downstairs rooms (known as clubrooms) were named after patron saints, and the colour scheme was cream and brown, with blue curtains on the stage.

The hall hosted an Autumn Market to raise money for the church in November 1936,[10] and on 18 January 1937 a public meeting held in the hall about controversial local building issues was attended by more than 100 people, leading to the formation of the Blackheath Society,[11] a local conservation society which is still in existence.

After World War II began, the hall was formally requisitioned in 1940 by the London County Council to be used as a British Restaurant, designed to provide low-cost hot lunchtime meals to local residents and workers;[12] after the war it served as a 'civic restaurant', and continued under LCC control until 1955.

In 1988 the parish hall was judged by the Diocese of Southwark to be surplus to requirements, and a suitable organisation was sought to take on the tenancy.