Storage space and heating problem

Hello everyone,
We are building a prefabricated house (urban villa passive house KfW 40 Plus including photovoltaic system, almost 160 sqm with fireplace and hipped roof 25 degree roof pitch)

We submitted the building notification without a basement for cost reasons (according to the manufacturer, residential basement including white wall approx. 60,000 Eur and from the aspect that we have had such bad experiences with basements in rental apartments).

Now, for 2 weeks I can't get the thought out of my head that this will be a mistake. Where to go if we want to have a party, where to put the hobby room, winter clothes, flea market boxes, fitness equipment, where to put our holiday souvenirs, where to put my decoration items, and so on. And what if we want to add a sauna later.

Unfortunately, the rooms upstairs are already completely used up. We had the idea of a guest house in the garden which should also serve as a hobby room and storage space. But we received news from our architect that this will definitely not be approved. We are only allowed to build 30 m3. A conservatory would be too small and also quite expensive according to research.

I need some experience reports and possibly assistance. I'm afraid we will really regret it and I won't be happy.

Furthermore, the air-to-air heat pump system from Proxon was highly recommended to us, sales Proxon (Zimmermann Ventilation). However, I now have very big concerns during the cold days that the floor (we have tiles downstairs and laminate upstairs) will become too cold, especially for our baby. We were told that nowadays you do not really feel any warmth sensation from underfloor heating. We are unsure which type of heating is right for us.

And one more thing. We have a garage with space for one car and a small storage room. Unfortunately, more is not possible on the property.
I also don’t know if it would have been better to have a door from the garage into the house; we only now consider this possibly really necessary.

I always have the feeling that I forget something again in the house planning that I might regret later and now lie awake at night. I just can’t switch off.

As an attachment, our floor plan. There is still a pantry under the stairs. Maybe someone has an idea for a better layout. Unfortunately, the kitchen also became very small because we still had to include the office for the desk and a wardrobe cabinet. Best regards

You can barely make out the floor plans, maybe scan them as a PDF sometime. And, it is also sensible to consider

Hello :)
Unfortunately, I can hardly read the measurements - is the house really only 9.30 square meters?
I don't necessarily consider a basement to be necessary, since that's also costs.... however, here and there half a meter more could be quite beneficial.

Hobby room, winter clothes, flea market boxes, fitness equipment, where to put our vacation souvenirs, where to put my decoration stuff etc. and what if we still want to build a sauna.

About the hobby: which hobby? The planning of a hobby room should be considered before planning a house, just like children's rooms. Otherwise, the office can be used for sewing, the sofa for surfing, the DB for the model railway, and the living room for sports. A fitness device just collects dust; you should rely on a fitness club or running instead ;)
Flea market boxes are on our shelf in the garage, vacation souvenirs find their place in our spice drawer or shelf.

You really do lack some storage space. And definitely the wardrobe!!! But the utility room could be a bit smaller. Make sure to plan a free wall in the utility room so that you can make a row of cupboards there. This can hold all the decorative stuff, tools, cleaning supplies, and provisions.
I find your pantry unnecessary; the door also interferes with proper kitchen furnishing. I would put the door facing the hallway and make the wardrobe with your countless jackets and shoes under the stairs there.
The utility room has wasted space in the middle... but you can put a built-in cupboard in front of the WC.
Upstairs, the dressing room is too narrow and the zigzag path is not well thought out. Remove the window there and a small walk-in square closet would be better in terms of usage. But here I see potential if the house grows 50cm in width.
The air space is also wasted area, hardly useful except that it can let air rise up there. But no one will stand there and enjoy the great view down below. - I would make that into a storage room.

From a planning perspective, it's not very smart to place the toilet upstairs above the living room. Why aren't the children's rooms next to each other? Why isn't the bathroom above the utility room and guest WC? Please fill out the link that kbt09 posted for you :)
There is still quite some potential... for the architect!

Are you allowed to build larger or does your plot ratio forbid it??? It will probably be less of a cost issue than a basement?! ;)

Wait and see what ideas Kerstin ( ) has for you. The criticism should be similar though :oops:

Best regards, Yvonne

;) .. a fundamental point is that floor plans should always be sketched to scale with the furniture you definitely want to include.

For example, the kitchen is not usable like this and overall, the floor plan suggests more space than is actually available.

The fireplace placement also takes up a lot of space, and the question is whether it is even used sensibly in that position.

All the floor-to-ceiling corner windows on the upper floor .. they should perhaps be checked, especially in the children's rooms (for example, the north arrow is missing here, so the orientation cannot be determined). In other words .. furnish as an example and see if the desks end up in front of the windows. Then better wider windows but with a sill height of 80 to 90 cm.

I see the walk-in closet like Yvonne. It would actually be advantageous to have the bed with the headboard on the outer wall, then the access door can be moved further to the left and at least 5 m of wardrobe space can be placed. For this, all the windows have to be adjusted.

The cloakroom on the ground floor is really insufficient. Especially with 2 children.

So .. there are quite a few things to consider.

I will never understand, someone doesn't have 60,000k for a basement but builds a kfw40+ house and then also an air-to-air heat pump.

Is there already a [bodengutachten]?