A list of the various home depots and training locations of the Royal Engineers
| RE Unit or Depot | Depot location | Remarks |
| (1st) Reserve Battalion and Depot Battalion | Chatham | Organised on mobilisation in August 1914 but essentially similar to what had already existed at Chatham. Reserve Battalion (A to F Companies) trained new recruits. Depot Battalion (G, L and M Companies) received men returned from Expeditionary Force and also men enlisted for Tunnelling Companies, Special Companies and other specialist units |
| Billeting Battalion, later called 2nd Reserve Battalion | Chatham, late moved to Chattenden | Formed when original Reserve Battalion could no longer cope with numbers of recruits |
| Provisional Companies | Chatham | Formed when original Depot Battalion could no longer cope with numbers of recruits. Two Groups of Provisional Companies were formed: No 1 included G, L and M Companies and a new Provisional Bn; No 2 was made up of four new Provisional Bns. Additional J and Q Companies were added to No 1 in early 1918 |
| Dismounted Training Centre. Formed 3rd Reserve Battalion in Jan 1918 | Newark | Formed to help cope with flow of recruits into New Army units. |
| Dismounted Training Centre. Formed 4th Reserve Battalion in Jan 1918 | Deganwy | Formed to help cope with flow of recruits into New Army units |
| 5th Reserve Battalion | Christchurch (Bournemouth) | Formed in Jan 1918 from what had been the reserve Field Companies grouped in Southern Command. Abolished in October 1918 to make room for a new Bridging Training Centre |
| 6th Reserve Battalion | Irvine | Formed in Jan 1918 from what had been the reserve Field Companies grouped in Scottish Command |
| Royal Monmouth Reserve Battalion | Monmouth | |
| Royal Anglesey Reserve Battalion | Beaumaris | |
| Mounted Training Depot | Aldershot | |
| Special Brigade Depot | Withnoe (Devonport) | Originally called Special Brigade Reserve Company |
| Signal Service Training Centre | Woburn | Al;so established a number of other sites in the vicinity. HQ moved to Bedford in October 1917 |
| Signal Service | Bedford “A” | Recruit Depot |
| Signal Service | Bedford “B” | Signalmen and Linesmen Depot |
| Signal Service | Bedford “C” | Operators Depot |
| Signal Service | Biggleswade | Air and Permanent Line Depot |
| Signal Service | Haynes Park | Riding, Driving, Saddlers etc Depot |
| Signal Service | Haynes Park | Switchboard Operators Depot |
| Signal Service | Haynes Park | Cadet Battalion |
| Signal Service | Hitchin | Draft depot |
| Signal Service Wireless Training Centre | Worcester | Moved to Fenny Stratford in August 1917 |
| Signal Service Depot | Dunstable | Moved to Wellingborough in March 1918 |
| Army Signal School | Dunstable | Army-wide centre for training signals instructors, under command of Signal Service Training Centre HQ, formed March 1918 |
| Source: Work of the RE in the European War 1914-19. “The organization and expansion of the Corps” | ||
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