I have a very cold study (no doors apart from one to the outside world, just an archway to the main room, and no radiator) and until recently my feet slowly froze as I sat at my desk.
Then I bought a "cat igloo" from Pets'r'Us to put them into (shoes and all) and cut out the drafts round them. My feet no longer get so cold that they hurt, even in this freezing weather. It may look very silly, but it has changed my life. And it is machine washable so no worry about that.
https://www.petsathome.com/product/pets-at-home-grey-spotty-igloo-cat-bed/7132732P?productId=7132732&purchaseType=one-time&size=oneSize
Much longer ago, and this is cheating, but they mean I am able to go on using my kitchen even now I no longer bend at the knees, and several people have mentioned upthread that they'd love a pan drawer:
when we moved here I realised that, in a very long narrow kitchen with no room to stand back from them, getting at whatever was at the back of the cupboards under the work-surfaces would involve lying on the floor. Over the next year or so whenever I had spare cash I bought openwork metal drawers to put inside the cupboards instead of shelves, so that I could pull out drawers and get at the very back at the bottom without a need for caving gear or a contortionist assistant. A different number of drawers in the different cupboards means some are the right height for tins, some for saucepans (no room to hang them on the wall, I'd be banging into them all the time), some will take bottles and jars, one is for plastic boxes, and so on. Individual design! Yay!
You do have to have the sort of cupboards that have holes in lines up the sides so you can very the shelf heights, but those take the drawers if you do have them. Once I had found ones the right size sideways, fitting them was a job I could do for myself with no more complicated tools than a screwdriver and a hammer.