Single-family house, estimated costs and suggestions for the floor plan

May I ask about the maximum height of the residents?

You have already mentioned the heights on the upper floor yourself. In the dressing room, only a little person can stand.
Even worse is the basement stairs. After 4 steps, there is already a wall from the office. In 4 steps, you have overcome about 70cm-80cm height difference. Minus perhaps 20cm floor construction, your tallest resident should be a maximum of 50-60 cm.
Since the smallest man in the world is 60cm, I doubt the usability of the basement floor.
One good thing about it, of course, is that you can save the 50,000€ for the residential basement and the pellet system.

By the way, your house doesn't fit on the plot at all.
Mom would probably stamp "rejected" on the building application.

With 15.5 m, you have to observe a building limit of 3 m at both the top and bottom. That results in a maximum house size of 9.5 m.
For example, we also have to keep at least 5 m of space in front of the garages.
I probably don't even need to ask about the floor area ratio.

With 341 m², probably only a semi-detached house would be possible.

Dreaming on paper doesn't cost anything yet. It only gets expensive when you go to the bank with it and they make you sign. They don't always check there.

@Musketier: What do you think, why am I even making such considerations? Quite simply: to estimate costs, space problems, and more. Only then can I find out if the whole thing will ever be feasible for me! And then we might move on with an architect, etc. Only after that do you go to the house bank or wherever. It’s pretty bad to be rejected for a loan.

Regarding the dressing room: Has anyone said that you actually have to dress in there? You can simply use it as a large closet or storage system, which would be sensible given the lack of space (I’ve even seen this work great in the attic apartment directly above me!). And those who can read are clearly at an advantage. I mentioned that I have to raise the wall on the south side a bit because it is extremely low! Unfortunately, I haven’t yet figured out 100% how to do that best with this little program.

One good thing about it, of course. You can save the 50k€ for the basement and pellet system.

And how am I supposed to heat then? With electricity? With oil (where would the oil tanks go)? Why do you think I want to install a pellet system? --> efficient, well combinable, reasonably cheap, consumption of a long-available raw material (called wood). Ever heard of that? Combination with, for example, a solar system for hot water, photovoltaics for electricity, geothermal baskets. That would make you (depending on total capacity) more independent. That’s certainly desirable!

And regarding the property: Do you perhaps see an official property plan there? NO! That is a sketch by me. That’s how a property with my house might look. Your 3m and 5m to the boundary or the street are only partly correct. Because if you look into the building regulations, §2 already states that existing development plans (e.g., the new development area in our town) are not affected by that. That means the respective development plan applies! §5 states that you can also submit exemption requests to the LRA, which are then handled by the LRA and the city. This plan is thus feasible! The ~350m² is an absolute MINIMUM with a site coverage ratio of 0.4 (standard in our area). You can calculate that yourself...

@Schdin: Nice that someone brings a comparison. You live between Ulm and Biberach. That’s quite close to me. Just about 80km... What kind of builder are you with? Feel free to send me a PN as well, if that’s possible here.

I sent you a private message. You have a button at the top where you can check yours.

As for me, I can say that everyone told us we would never manage it and that we wouldn't succeed. I have to say the exact same thing was said about my dad back then because he planned his entire salary for the financing and my mom was responsible for the rest. It also worked with 3 children to pay off the house within 15 years. We have the notary appointment on Monday and I am firmly convinced that it is doable. Tightening our belts is definitely necessary but it is doable.

@Musketier: What do you think, why am I even thinking about such things? Quite simple: To estimate costs, space problems, and more. Only then can I find out whether the whole thing will ever be realizable for me! And then you might continue with an architect, etc. Only after that do you go to the house bank or wherever. It’s pretty bad to get rejected for a loan.

You have the wrong approach. First roughly check finances, then see what scale is feasible, find a suitable plot, and finally tackle the floor plan. It should be clear that the final financing is not completed at the beginning. You have already gotten the prices for your initial idea of a house from Bauexperte. I don’t understand why you continue planning with 150m², garage, and basement. Saving 10k€ here or there might be possible through personal work, but Bauexperte quoted you twice what you are planning.

There are rough price guidelines that you keep finding online:
- about 1500€/m² of living space
- If you want something other than a gas condensing boiler, I would calculate at least 10k€ for pellets or heat pumps with deep drilling, probably more
- Basement 30-50k€ (a residential basement like yours rather more)
- Outdoor facilities 10-15k€
- Additional construction costs as Bauexperte has posted repeatedly around 30-35k€
- Garages about 8-10k€/garage

Our planning looks as follows:
Budget approx. 280k€
Plot 47k€ (525m²)
Additional construction costs 25k€ (since some connections are already included in the plot and the land is completely level)
Solid house 125m² 164k€
Selection costs 10k€
Floor coverings/wallpaper 8k€
Surface collector 10k€
Outdoor facilities 10k€
Construction supervisor 3k€
But it must be said that prices are quite low here compared to Bavaria.

Regarding the dressing room: Did anyone say you actually have to dress in there? You can just use it as a big closet or storage system, which would be sensible given the lack of space (I even saw this directly in the attic apartment above me --> works perfectly!).

If you call it a dressing room, I assume you want to go in there. If you don’t want to go in there but use it as a closet, then the bed stands in front of the door. The problem is surely quite easy to solve from a planning perspective by increasing the knee wall or by having a full upper floor, but that also costs money again.
Better not mention the stairs at all. Especially a functional staircase is the most important thing in a floor plan. If you change it, the entire floor plan above and below changes.

And what should I heat with then? Electricity? Oil (where would the oil tanks be then)? Why do you think I want to install a pellet system? --> efficient, well combinable, reasonably affordable, consumption of a long-term available raw material (called wood). Ever heard of that? Combined with, for example, a solar system for domestic hot water, photovoltaics for electricity, geothermal baskets. That would make you (depending on total output) more independent. Surely this is desirable!

Being environmentally friendly is always desirable. If it were up to me, I would also have deep drilling and photovoltaics on the roof. Unfortunately, the budget doesn’t allow that. But here we are again with the above topic. First check finances, then see what is feasible, then plan. With the finances you mentioned, you will have to make many compromises. The heating system is probably one of the first things you will eliminate in this form.

And regarding the plot: Do you possibly see an official plot plan there? NO! This is a sketch from me. This could be a plot with my house. Your 3m and 5m to the boundary or the street are only partly correct. If you look into the building regulations, it is already stated in §2 that existing development plans (e.g., new development area in our town) are not affected by this. That means the respective development plan applies!

Planning a house without an existing or prospectively available plot is pointless. Only then does the orientation of the rooms make sense.
Besides, only then do you know what remains of your budget.
By the way, the 3m boundary is probably difficult to undercut because development plans must also comply with state law.
I once read that at least 400m² should be available for a detached house.