We have a horrible smell coming from one the walls on one side of the house. It doesn't seem to be a dead animal and has been around for about 2-3 months now. We have removed the baseboards on the wall and the smell seems to be coming from inside the wall. It smells almost like sour grass or strong chopped weeds... not really a rotten smell but still a foul odor. There are no signs of leaks or water damage that we were able to see, we also removed a small piece of dry wall to check for wetness and nothing. We have noticed the smell does get stronger when the weather changes and some days you can't smell it at all and then the next it will be super strong.
We have no idea what it could be or even who we should call out to try to figure the smell out.

When was your place built?
I've seen similar posts on another website, the bulding materials were bad, and caused the residents to become ill.
Please get a professional opinion.

It was built in 2004... can you recall the other website? I would love to see what it said.
Thanks