Floor plan feedback: Semi-detached house for a 4-person family, self-designed

I like my rectangular living room. However, I have space for cabinets.

For fixed windows it is already feasible, with safety glass.

I know. But it’s not sensible, as you also want to ventilate or clean windows sometimes. My objection refers to the use of planning software combined with focusing only on aesthetics without considering functionality.

I may be repeating myself, but with a budget of 650,000 - possibly up to 700,000 for demolition, documentation, securing, underpinning, and new construction of approximately 280 sqm usable space with very generous window design and fittings including kitchen, there is no need to discuss floor plans until a dose of reliable reality has settled in the budget planning. Building in direct proximity with foundations below the neighboring foundations is not something you can get off the shelf cheaply. Depending on the provider, even the builder's insurance can become more expensive because the potential damages to the neighboring house have to be taken into account.

With the amount of glass on the south and west sides, you might as well include the costs for shading and air conditioning in the budget.

probably conservatively estimated in some positions...: 40 demolition 20 carport with porch (probably significantly more due to special height and dimension) 20 outdoor facilities (terrace, paving) 20 ancillary costs connections, old connections probably legally unusable 100 basement (1k/sqm) 500 house (a little over 200sqm x ~2500€, the glass surfaces are above usual standard ;), KFW40 usually also comes with a certain surcharge) 10 fireplace (probably rather an absolute minimum and sometimes energetically difficult especially with KFW40) Then there would be additional upgrades, foundation or support efforts, replacement of the wooden wall, furnishings, kitchen, etc. Apart from that, I quite like the floor plan, there are some details with question marks like the necessity of 2 windows in the kitchen under the carport or where a refrigerator and oven would be located. Basically, I would design the windows facing the street with a higher sill and elongated shape rather than floor-to-ceiling loopholes, and the sill on the upper floor facing the garden also at least knee-high so that you can place something there or hide something behind it and not see all the chaos directly from the outside, the added value in terms of more light through a few centimeters is quite limited. In the parents' area, I would probably assign the little hallway cutout on the left to the parents' area and make only one additional door to the bathroom, which gains a few more centimeters. Lead the fireplace inside as far as "must-have", the pipe outside looks cobbled together. If the windows are to be frameless as indicated, probably only the garden side will be in the six-figure range, for a more reasonable impression it's best to see if you can still add "frames" here, which usually are not really narrow.

Apart from that, I quite like the floor plan, there are some details with question marks

I have not dealt with it in detail. Several contradictions seem too significant to me at once: between the budget and the iceberg items of the calculation, generous room size and unclear furnishability, and "last but not least" a semi-detached house harmony like between the "Twins" de Vito and Schwarzenegger ...