Optimal use of a narrow building window

5m becomes too tight. Keep in mind that the internal dimension is even smaller. You will never be able to regularly park two cars in there, because you would first have to let everyone get out or free the children from the child seats and then drive with the passenger side close to the garage wall. Especially if two small children are planned, you have other things to do than parking the car. We have a steel garage with a width of 5.45m. Due to the narrow outer shell, it still somewhat works as a double garage. We park one car forwards and the other backwards so that the child can always get out of the child seat towards the middle. With some goodwill, you can also squeeze a child's bike/balance bike/Bobby car between the cars. With large bicycles, it becomes tight again because of the mirrors.

5m becomes too tight. Keep in mind that the internal measurement is even less. You will never be able to regularly fit two cars in there, because you would first have to let everyone get out or free the children from the child seats, and then drive closely along the garage wall on the passenger side. Especially if there are two small children planned, you have other things to do than parking the car.
We have a steel garage with a width of 5.45m. Due to the narrow outer shell, it still works somewhat as a double garage. We park one car forward and the other backward so that the child can always get out of the child seat towards the middle. With some goodwill, you can still fit a child's bicycle/balance bike/Bobby car between the cars. With large bicycles, it gets tight again due to the mirrors.

Bicycle with mirrors??? ;-p

As mentioned, normally there should only be one car inside and the other one in front. Both inside would be, for example, for vacation or something like that. The house is currently planned with a length of 12.4 m. If we fully utilize the building window and move the house all the way to the south, we have another 20 cm of space. However, this would be a special dimension, at least if you want to buy something ready-made.

But here in this thread, my main concern is actually the floor plan and not the carport/garage. Even though the suggestions are useful and valuable....

We have a construction discussion with our [BU] on 23.09. and want to use the time to incorporate any changes.

I just looked at your surroundings on the map again and noticed that none of your neighbors keep even close to 30m distance from the forest - so why should that be the case for you? Especially since this is not really a forest, but rather a few contiguous trees. It is certainly worth protecting - but 30m distance? That can be done on the outskirts, but not in the middle of a built-up area.

Construction is also done deeper in the immediate neighborhood than what is apparently (standardly) allowed to you, so I would argue to the building authority that you comply with the floor area ratio / plot ratio, but (possibly with neighbor’s consent and formulation of a deviation / building encumbrance) you shift the location of the building envelope to the south to gain more space for garage and house.

What I also noticed - a fellow student of mine is a publicly appointed surveyor in SH and has his office less than 2km from your building site. I can gladly put you in personal contact with him, but you can also do so yourself, as there is only one publicly appointed surveyor in town. You will need a surveyor anyway; maybe he still has an idea of how to get even more out of it. Your building envelope is tiny with 91m² in relation to the plot, which must also be clear to the building authority.

I have also attached a revised sketch for you - if the house deviates from the standard floor plan, you gain +6sqm floor area this way. The further the house moves south, the better this naturally becomes.

Best regards Dirk Grafe

I believe your problem is that, in addition to the difficult plot, you are also putting yourself in a corset by having a general contractor plan instead of a creative architect, who does not depart mentally from his standard houses, and - even worse - you are setting yourself a time limit... Just because it was recently purchased does not mean the building application has to be submitted this year.

If I were you, I would allow myself breathing room in every respect. You still have 2 quarters available

Edit: You can have an architect create a plan and still build with your preferred construction company.

The building authority is not really the problem here, but rather the responsible forestry office. The clerk from the building authority told me that there were already discussions with the forestry office during the preliminary notice. His recommendation is not to deviate from the preliminary notice (except for the +2m in front of the house that he approved). Whether it is forest or not in the eyes of a "layman" (not that you are a layman) initially has no impact on the F-Plan of the area, does it? For me, it’s still far from being a forest, but if the forestry office says we must(!) maintain this 30m distance, then I would rather not do anything different.

Regarding the publicly appointed surveying engineer, he (or one of his employees) has already been there and measured the property and placed boundary stones. I gave him my sketch with the adjusted location of the building window, and he wanted to pay special attention to making sure that it fits. This is currently with them for processing for the cadastre office. The later boundary of the forest still must be newly determined by the forestry office anyway, right?

Regarding the change of the floor plan, I don’t know if this is that easy (also in terms of cost) to implement?! The contract with the builder is already signed. We can make changes to the floor plan, but I doubt that we can change the outer walls to that extent?! But I can ask anyway....