THE Leeuwin Barracks are officially for sale, with the sprawling riverfront site likely to add more than $100 million to Defence department coffers.

After years of dilly-dallying the department bit the bullet this week and deemed the site to have “no ongoing operational or strategic need”.

Defence parliamentary secretary Darren Chester says living units will be relocated to Irwin Barracks.

“The defence estate is ageing and the cost of sustaining it is expensive and increasing,” Mr Chester said in a press release.

It’s not known yet whether the site will go out to tender or be sold off-market.