Valuable: If you don’t count a music collection as a single object, then it’s probably our boiler, maybe? Outside of that and our kitchen appliances, some of our furniture is worth a fair bit now (we picked it up in sales or have got it on ebay and restored it).
Precious: probably my external hard drive, as I’ve not completed the process of uploading everything to the cloud yet, but even then, I don’t know that I’d run into a burning building to get it.