If you are talking about a cup nest that you can see in the potted plant, then the bird is likely not a wren. To the best of my knowledge, except for sedge and marsh which build their own nests ( which contain a cavity) the other wrens are all cavity nesters. Not sure what it could be though, a photo would help obviously...
Dan Kopp
Sacramento
Dan Kopp
Sacramento
Many dreams come true, and some have silver linings; I live for my dream and a pocketful of gold...