Single-family house 175 sqm without basement, too big?

I had thought about it too, but I have no sense of the size of the utility room. But I will definitely keep an eye on that!

Laundry is not supposed to be dried there, but of course, the heating must be taken into account, thanks for the tip!

can certainly explain it better. If you plan with small children or a desire to have children, it will be as you think, until they move out and that's it. Your son is older and will become more independent, someday he will be gone. That point will come for you 10-15 years earlier than for many other builders. Hampshire built a house for two + his sons. They can eat at mom's but don't bother at 11 p.m. if they are hungry. Furthermore, it is about the use when the kids are gone. Standard houses eventually become too big, further uses are difficult. With Hampshire’s concept, his house fits, and he can counteract vacancy through renting, AirBnB, or moving in a caregiver. For you, it is also advisable. To expand or plan along the son’s space with a small bathroom, mini kitchenette, and separate entrance. You then also have a master bath.

I was talking about the pantry, not the utility room.
In the pantry, it’s questionable how you want to design your kitchen and how much stuff you have. For example, the question of toaster on the countertop or in the cupboard, because in the cupboard = less space for pasta and so on, best to completely overturn your current kitchen to see how much space you have, need/would like to have. Should there be another fridge in the pantry? Only a few ingredients? A worktop? Beverage crates? However, only shelves are drawn in, and in 4m2, shelves all the way to the ceiling fit A LOT!

The utility room depends on what technology you install, size of heating/water tank, ventilation or not, smart home server cabinet or not, just a washing machine or also a dryer, space to hang laundry. Do you have a storage room at the carport or a garden shed? Without a garage -> what else then has to fit in the utility room?

An idea I put to everyone for discussion -> turn the stairs around for shorter routes out of the living area?!

I can definitely understand the thought, no question. But it’s also a matter of setting priorities. If I add this to the to-do list now, other things will inevitably fall by the wayside, and I don’t fully support the idea enough for that.

Yes, the pantry suggestions are good food for thought... So far, the idea would be to put a freezer in there and otherwise fill it with shelves, which would also have to hold a toaster, a kitchen machine, etc. I had confused that with the utility room, sorry. What I haven’t mentioned yet: I want to move the washing machine and dryer to the bathroom upstairs if possible. Most laundry simply accumulates on the upper floor, and I don’t want to have to carry it up and down all the time. There will also be a tool room outside at the carport, where gardening tools will be stored. So the technical room is really only for the house technology; nothing else should go in there. Turning the stairs around also seems very interesting! It actually kind of makes sense, since otherwise you always have to walk all the way around… But so far I haven’t seen that anywhere.

We are planning a second utility room upstairs, very small for washing machine, dryer, ironing board, etc. -> maybe this is an alternative idea for your storage room upstairs, to use part of it for that?! The devices and accessories in the bathroom rather steal some of the coziness, especially since you no longer have small children who keep their toys and potty in the bathroom anyway, this would be important to me.

How many young adults who still live at home want to cook?

For us, 100% when they have visitors, then proper cooking, frying or baking takes place. Then having their own bathroom is also an advantage. The boys each have a 2.9m kitchen row with a sink, an oven, a cooktop, a kettle, a toaster, and a refrigerator. Ikea and assembled and connected together – so they learned something right away. Our kitchen is no longer available to the boys after 8 p.m. – however, we also have an open-plan concept for ourselves. What has also proven beneficial is that we no longer have discussions about things lying around and differing sleep rhythms, and that really benefits the overall atmosphere.