Wall crack on the second and third floor possibly caused by plumbing leak - How serious is this?

This message was edited 4 times. Last update was at 05/26/2019 11:12 PM EDT

Hello all,

I'm a first-time buyer who just finished my first home inspection with the help of a licensed inspector. I earlier observed a wall crack on the second and the third floor but forgot to mention it to the inspector. When I sent the photo of the wall crack to the inspector today, he said it could be due to an old plumbing leak -- and this explains why the ceiling of the second floor living room (right under the third floor bathroom) was repainted -- the townhouse is less than four years old. We will go back to the house to check again in three days (cannot go earlier due to my work schedule). My inspector is a very good one and I appreciate his work a lot. To just get some peace of mind, can I ask you guys here:

1) Is it possible/common to have a wall crack on the second and third floor due to a plumbing leak in the third floor bathroom? I'm in midwest Canada and people say leaks can be caused by foundation problem as well.
2) Will this crack stay the same or will it get worse in the future?
3) Is this a serious problem, or is it a minor problem? What exactly should I check?

FYI, I have uploaded the picture of the wall crack and the repainted ceiling. Other than these, we observed some cracks in the stucco which was said to be normal here.

Sincerely,
Anna

This message was edited 2 times. Last update was at 05/26/2019 11:05 PM EDT

As a reference for comparison, here are the extent of cracks in the stucco.

It's hard to tell just from photos, and of course it's best to see the items in person. The minor cracks may or may not be related to the prior leak. However, the cracks shown in the photos look like normal thermal and or moisture content related movement to me and I would expect them. Every house will get some cracks.

Thank you Mike for your kind reply!

The cracks in the stucco are most likely not the source of your cracks. Seems too small. However, it is very important to seal any cracks in the stucco ASAP or you may run into water infiltration problems in future.

I agree with Mike Casey.... it's difficult to say for sure that the cracks are related to plumbing issues just by looking at photos. Usually, other symptoms would be present when it comes to water leakage and/or infiltration, i.e., sagging ceilings, paint flaking or sagging, discoloration, a smell of humidity, etc.

Were any renovations recently done in the bathroom above that included plumbing? Chances are the cracks are not related to a previous plumbing issue. My gut tells me its an esthetic issue. Hope this helps