safe as houses
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(as) safe as houses
Extremely secure or well protected. The phrase alludes to the idea of "home" as a safe haven or shelter. I locked your jewelry in a drawer, so it's as safe as houses. No matter what happens in coming months, your position in this company is safe as houses.
safe as houses
Totally secure, as in If you buy Treasury bonds, your money will be safe as houses but you won't get a large return . In today's security-conscious climate, where alarm systems to deter housebreaks have become increasingly common, this simile may seem puzzling. Presumably it uses house in the sense of "a shelter from the elements." [Late 1800s]
safe as houses
BRITISHIf something is as safe as houses, it is very safe and reliable. Both managers can count on one thing — their jobs are safe as houses. If you think building society cheques are as safe as houses, think again.