The flats will go to local families with a connection to the borough who become homeless and whom the council has a legal duty to house.
Cllr Robin Betts, the council's Cabinet Member for Housing, Environment and Economy, said: "We're very pleased to be providing these extra homes for temporary housing. They are in a sustainable location - close to the town centre, railway station and importantly within the borough. Everyone has a right to a decent place to live, and we are proud to be able to support local families from Tonbridge and Malling who find themselves needing emergency housing at short notice to stay within the local area."