Kim Kardashian and Kanye West’s empire is growing, but their latest expansion in Hidden Hills might slow it down … because they’ll never need to leave.

Sources close to the couple tell TMZ … they just scooped up a neighboring property of their massive HH estate — which already has an estimated value of $60 million — for another cool $3 mil.

They are the property was on the market — Kim and Kanye didn’t squeeze anyone out — so they decided to buy it, they now are the owners of 8 acres all in a row.

Of course, they already have HUGE plans for their updated compound. TMZ is told they plan to transform their combined properties into guest homes, a spa retreat, and essentially … a private farm for the kids.