From 1868 to 1869, the chancel, transepts, and the East bays of the nave were built, having been designed by G. E. Street.

In 1908, a vestry, baptistery, and the Western part of the nave were added by Sir Arthur Blomfield and Sons.

It was designed by Sir Arthur Blomfield and Sons, and was decorated by C. E. Kempe and Co. During the First World War, the vicar, Henry Hall, served as a military chaplain with the 29th Division, British Army.

[2] Having returned to his parish, the vicar wanted to commemorate those who has lost their lives during the campaign.

[1] The parish of Holy Trinity, Eltham is located in the Archdeaconry of Lewisham & Greenwich in the Diocese of Southwark.