Erika, having lived in a small house for many decades, occasionally in a tiny one, in a rural location where we are on our own, I've found it's really important not to fall in love with the outside of a tiny house. You can always make them attractive later. But it's inside where you will be bumping into each other as you pass, be tired, using a toilet with No Privacy from sound, only a
shower or knees-up-to-your-chest bath container, be inside on overcast, grey, stormy days that don't add a lot of optimism, so it's the inside that counts.
One crucial thing that isn't a part of any tiny house I've seen is a mud room for muddy
boots and shoes, dripping raincoats and umbrellas before you get inside. I've seen some with a small washing machine, but where are you going to hang and dry them when there is no sun? Hanging things in the
shower or over the bathtub means you can't take a shower or a bath, and where do you put the wet stuff in the meantime?
Is there a hardware closet somewhere for the vacuum, broom, basic tool box, and all the screws, nails, cuphooks, etc, supplies for such things? Skimping on any of these leaves you tripping over the really ugly stuff of real life.
Very small counter spaces in the kitchen mean you won't be doing much cooking, because there just isn't room for the bowls, mixers, ingredients, dirty dishes and dish drainers. We've got 15 feet of countertop space, and it's difficult to do much cooking.
Remember, heat rises. All the heat will go up into that loft, and if you've got a woodstove or heater you are going to leave on all night, that is doing its job, that loft will be baking, so it needs ventilation, yet that lets out the heat. Maybe 20-somethings are happy climbing a ladder to sleep in a loft you have to crawl around on to change the sheets and get comfortable, but I'm done with those days. Where are you going to dress and undress if you can't stand in the bedroom?
Do you have indoor hobbies like sewing or crafting that needs storage for supplies, a sewing machine, an ironing board?
Have you ever in your life fit all your clothes, underwear, winter coats, scarves and warm socks in a closet you can barely stand in?
One thing to try, rent a fifth wheel trailer for a week or more, two of you in it doing everything you can think of, (no bringing in fast food) and see what matters to you, if the space is
enough, if you both want to lie flat to watch a movie is there room? Is there room for two big comfy swivel chairs, if that's what you like. Use a tape measure, and be honest with yourself about only having one main space (I wouldn't call it a room) to be in 24/7.
Where is your company going to hang out? The smallest place we ever lived we thought was fun, it had a woodstove, barely enough room to get around a 6 foot table with chairs, had a great view and a porch, but friends were rarely comfortable in it. They tried to
be nice, but you could tell. So company only came in the summer so meals could be outdoors.
I've found that 35 feet is the smallest length that feels spacious enough for 2 people, and even that needs a mud room/laundry room on the side.