House Planning - Avoiding Mistakes in the Initial Phase

You work in IT, but the development there is rapid. Therefore, I am surprised by the mentioned technical standards, which will be completely outdated in 4 years; also other "standards" or technical possibilities. For this reason, I consider such detailed planning, especially in the area of technology, at the current stage to be more than premature. It is best to visit a model home of a company with high quality and get a price for your ideas. Even better, stay here for a longer time and many questions will answer themselves.

I skimmed through it quickly.... for me, it's very "toy-heavy" :) Make sure you create a house where you can fundamentally feel comfortable. A USB-C port on the socket or ceiling speakers etc. are simply secondary.

We have been living in the house for 2 years now and I slowly realize where I could have done things differently. But that’s more about the room layout etc. The roughly 200 km of LAN cables in the house and my speakers that I can control from any tablet, computer, or phone don’t help me much.

My very simple but MEANINGFUL highlights for ME: - Central vacuum cleaner with a docking nozzle in the kitchen area - Ventilation system (decentralized supply air and centralized exhaust air with energy recovery) - Many very large windows for lots of light - good lighting concept (I always find it a shame when people build new and have only one lamp simply in the middle of each room)

If the rooms are badly designed, if the air inside is bad, if the light is bad, then you won’t feel comfortable. No matter whether cool music plays over the ceiling or not :-)

1. Set your budget. Your budget is, as others have already written, too small
2. What are you allowed to build? Development plan §34 etc.
3. What do you need? Discuss your room program in detail. Not kitchen x sqm, bathroom, 3 bedrooms but
Kitchen with peninsula, x m of workspace
Bathroom with shower, sauna, freestanding bathtub, this much cupboard space etc.
It is important to list everything that distinguishes you from the ordinary. Model railway, gaming PC, bookshelf, shoe collection, XXL dining table
4. Always draw the existing and desired furnishings to scale in every floor plan
5. Once you have your budget, you can think about extras like KNX, heat recovery (our builder once showed us an invoice for this, but it never pays off)
6. Visit show homes. They give a sense of space and help coordinate your tastes. It is not about whether faucet xyz is good or not, but about things like square shapes are a no-go
7. Order house catalogs
8. The more precisely you know what you want, the easier it is to find the right general contractor. Every general contractor has a standard and it should have the largest possible overlap with your requirements
9. Note everything that bothers you at your place. Note everything that you like. Whether you ever implement this is another matter. If you find a friend’s coat rack great in terms of dimensions, then ask for the measurements. Does the tiny sink bother you, tight space at the dining table, the feel of the flooring. Ask, measure. You can also do this politely.
10. For barrier-free construction I recommend checking out Nullbariere. You can consider quite a bit in the floor plan, but not everything
11. Electrical outlets are very individual. Follow your own habits

By the way, I wouldn't get my building inspiration from Poland: Poland is abroad, the energy saving ordinance is a "German" regulation, and a house nowadays is so high-tech purely from a building regulation standpoint that "import models" are only conditionally transferable and usually need to be adapted. The same basically applies to other eras: Eighties pseudo-Bauhaus often still has "cantilevered" canopies or similar gimmicks that "grow" directly from the floor slab without "iso baskets," which you can no longer replicate 1:1 today. Therefore, I would always look for compatible inspirations.

My very simple but MEANINGFUL highlights for ME:
- Central vacuum cleaner with a docking nozzle in the kitchen area

Oh, that sounds like finally a useful invention.

Ventilation system (decentralized supply air and centralized exhaust air with heat recovery)

I don’t know enough about that; which system would that be for example and what exactly is the advantage of THIS system?

Make sure to get a house in which you fundamentally can feel comfortable.

yep

For barrier-free I recommend checking out Nullbariere.

....and first question yourself what you exactly mean by that, what you want to prevent, and to what extent you are then also willing to give up other nice things for a - truly - barrier-free life in AND around the house. For a life with limitations/disabilities the building plot might not even be suitable........or...or.....
That sounds rather a bit like......I'll just take everything, please pack it nicely too.
don’t be upset, but rather take all that has been written here as constructive criticism. If you actually build such a great project, everyone here will gladly help you. In any case, it won’t work if you think, “that’s how I want it,” and then just do it somehow cheaper.
A stylish and sophisticated project requires appropriate materials, special planning, and thus significantly higher costs; if you only build large, it quickly turns into Gelsenkirchen baroque. In my first building phase it was often the case that in the countryside everything was done by yourself and always everything very big.
From that time there are still plenty of floor plans of horror and/or living rooms of horror to be seen today. Investing money in sensible, individual planning is often the better idea than just making everything bigger.

Thanks in advance for the few kind replies. I have now understood the budget issue. I have already looked at some cost breakdowns here and also asked friends and acquaintances who have just recently built. However, their houses never had this "style." Almost always with a basement or multiple floors and never with a shed roof. Opinions on the price also varied widely because, for example, no (load-bearing) ceiling etc. is needed here, but a large slab and a large roof are required. Construction is allowed according to §34. The idea of the room program is a good one. But we roughly know what must be included. (2x bathrooms with toilet, no bathtub or sauna etc., living/dining/kitchen open, 2x offices (since a lot of work is done from home), 1x utility room, 1x "guest room". There will be no children. Furnishing will be minimalist compared to many apartments. No large shoe/clothing collection, no space for seasonal decorations, children's "accessories" etc. We have already visited some model homes in the area (up to 100KM) and are pretty much in agreement. We both like clear rectangular shapes. No unnecessary slopes or niches. That is why we also like the floor plan of this house. Almost checkerboard-like. Open rooms with large, floor-to-ceiling windows and single-level living appealed to us. The fact that you can be outside from almost any room in one step is what we like about this. We also agree that a flat roof without skylights or similar features will be used. I really hadn't thought about house catalogs at all. I would have to find out about that. The technology is fast-evolving, you’re right about that. That’s why the plan is to lay everything in empty conduits. I know many people with houses from the 90s who now have permanently plastered ISDN in every room. That is completely useless today. I am also doing a lot of reading; I don’t know how the costs of a "city villa" translate to a bungalow. For example, those are built much more often. Regards