As of 2019 the 4th Engineer Regiment consists of:
 Regimental Command, in Palermo
Command and Logistic Support Company
Sappers Battalion "Simeto"
Sappers Company
Sappers Company
Mobility Support Company
Deployment Support Company
The Command and Logistic Support Company fields the following platoons: C3 Platoon, Transport and Materiel Platoon, Medical Platoon, Commissariat Platoon, and EOD Platoon.
Each of the two sapper companies fields a Command Platoon, an Advanced Combat Reconnaissance Teams Platoon, and two sapper platoons.
The Deployment Support Company and Mobility Support Company field the battalion's heavy military engineering vehicles: Biber bridgelayers, Dachs armored engineer vehicles, cranes, excavators, Medium Girder Bridges etc.
The sapper companies and Command and Logistic Support Company are equipped with VTLM "Lince" and VTMM "Orso" vehicles.
As of 2019 the 4th Engineer Regiment consists of:
 Regimental Command, in Palermo
Command and Logistic Support Company
Sappers Battalion "Simeto"
Sappers Company
Sappers Company
Mobility Support Company
Deployment Support Company
The Command and Logistic Support Company fields the following platoons: C3 Platoon, Transport and Materiel Platoon, Medical Platoon, Commissariat Platoon, and EOD Platoon. Each of the two sapper companies fields a Command Platoon, an Advanced Combat Reconnaissance Teams Platoon, and two sapper platoons. The Deployment Support Company and Mobility Support Company field the battalion's heavy military engineering vehicles: Biber bridgelayers, Dachs armored engineer vehicles, cranes, excavators, Medium Girder Bridges etc. The sapper companies and Command and Logistic Support Company are equipped with VTLM "Lince" and VTMM "Orso" vehicles.
4th Engineer Regiment (Italy)