Need more details on the problem. Is this a hosebib? If so, you should shut it off from the inside and drain it.
If it’s house plumbing, code generally prohibits plumbing in exterior walls for just this reason, and the renovator screwed up.
If these are older pipes in an exterior wall, there are various techniques, including the dripping faucet trick. You can also get heat tape and turn that on on cold days (or get a temperature activated plug). Or you can put vents in the wall that will allow enough heat to get in to keep them from freezing.