First, you could only potentially take legal action against the builder if the laundry room is in some way unreasonably dangerous--e.g. designed or built in a way that inherently poses an unreasonable threat. If that's not the case and the injuy is something which was not inherently caused by the design or how it was built, they would not be liable. For example, say the ceiling is low, or that the door jamb is somewhat high--that is not uncommon for a laundry room, and further, is a visible feature which users should be able to navigate (e.g. duck head; raise foot; etc.). In that case, they would likely not be liable. You write that your daughter fell as she was "backing out"--in that case, there is a good chance the injury was not due to the laundry room design or how it was built, since she fell as she was "backing out"--moving without looking where she was going.Second, even if the is some fault on the builder's part, if too many years have passed since the home was built, they would not be liable or responsible, since the statute of limitations (or time period within which you may sue) may have expired.Third, if you did not buy new from the builders but rather bought from a previous owner, it is unlikely that you could sue them, because they would not have a duty or obligation to you.You should consult with a personal injury attorney, or better yet, one who specializes in defective construction suits, to evaluate the situation and see if you have a case; but be prepared to hear that you may not.