Conduits will also be laid for future telecoms including space for future expansion, Seneviratne said.
The intention is to rent the space to telecom operators, he said.
State-run Ceylon Electricity Board had laid underground cables in several roads before they were re-built at their own expense and the water utility had also laid pipes, Seneviratne said.
By building utility ducts under roads, authorities hope to prevent roads being broken soon after they are built.
A number of key roads in Colombo are to be rebuilt under a World Bank funded program to modernize Colombo, and cut flood damage.Seneviratne said authorities have managed to minimize damage to roads recently re-built in Colombo due to utility connections being laid.