Re: Child-safe window check reveals unauthorised changes in bathroom. › Flat Chat Strata Forum › Common Property › Child-safe window check reveals unauthorised changes in bathroom. › Current Page 18/12/2017 at 12:20 pm #28881 sydprop Notwithstanding the modification issues. There are many different types of lock – and I would have thought you could mount one at the top. Maybe you could post a photo of a similar window.