You know you need one!
Having a home inventory will help you know how much insurance you need, replace lost items in the event of a catastrophe, and provide documentation for losses on your income tax return. You can use the process as an opportunity to de-clutter and donate as well, which is always good if you are considering a move soon.
I took the opportunity to do mine during an ice storm four years ago but now there are apps that make it too easy not to tackle any time of year. The Insurance Information Institute provides a free home inventory app. Check out recommendations for more good options.