Is it able to sell and buy a house at the same time? Yes, it’s doable. But you need to remember that it’s not a common idea because of how complicated it is. It can create a dreaded property chain which may lead to stress and chaos if you don’t know what to do.
But if you want to do it so badly, then at least you need to know about your home’s worth first. So use the online valuation tools that are widely available for free, and get some property agents to help you estimate the actual value.
Then, after all these steps are done, know yourself better. Start asking yourself about your own finances, how much you can afford for a new house, and what kind of assets do you have right now. When everything’s worked out, and your finances turn out to be more than decent, then it’s time to process buying a new property.