The general monthly format for services at St. Mary's church, Theydon Bois is as follows:
Every Sunday of the month Holy Communion (Book of Common Prayer) at 8.00am
Every Sunday of the month Evening Worship at 6.00pm
1st Sunday of the month, All Age Family Service (Lay Lead) starting at 10:30am
2nd and 3rd Sundays, Family Communion starting at 10:30am
4th Sundays Morning Worship starting at 10.30am
Junior Church during the 10.30am services on the 2nd, 3rd and 4th Sundays in term time
5th Sunday, Benefice Communion starting at 10am. This service rotates its location around the 4 churches within the Benefice.