Floor plan improvement suggestions for a single-family house on a south-facing slope

What is supposed to be produced in the "workshop" productively and, above all, monetarily, that half the basement has to be used for it?

My grandpa had a 12m² shed for his chainsaws etc. and 6m² in the basement for woodworking. Well, times have changed, but I have no understanding whatsoever of why one would need 20, 30, 40m² as a "hobby workshop."
Some businesses don’t even have that much space for a lathe, milling machine, bending brake, and workbench with 3 vises, shelves, and containers...

My comments here in blue.

The contour lines are relatively inaccurate, we have completely surveyed the property in a grid of 4.5 m x 3 m. I can gladly compile the information (at the latest by the weekend).

Always welcome the survey plan.

In Bavaria, in the larger area around Regensburg.

Then I hope for you that prices are better with you than they are here in the Upper Palatinate.

That would certainly be possible. The garage would basically also not be a big problem, if it weren’t for the green flat roof... Maybe switching to photovoltaics as an independent roof covering would be conceivable... (that is also allowed according to the development plan). I am happy to receive inspiration on that. Recently I heard about a green metal roof where the greenery is located between the individual standing seams.

Have you ever thought about artificial turf on a foil waterproofing?
Standing seam is way too expensive. Not an option for a flat roof.

In my design, two large doors in the south are planned in the basement. A gate in the fence allows relatively close access to the workshop.

I don’t see that in the contour lines shown so far.

No questions there, a few are definitely needed. These then have to be drawn according to the specifications of the structural engineer. That, in turn, depends on the construction method and the load above it. The supports can certainly be placed underneath, I am not too worried about that at this point.

Yes, sure that works. Reinforcing steel solves pretty much many of the problems. It’s the quantity that matters.

If you postpone the garage to later or manage it completely by yourself, you would be somewhat closer to the 650,000 €. Savings might also be possible in the outdoor facilities since agricultural machinery is available.
So if one were cautiously optimistic now, one could say that theoretically it would be feasible with some compromises and a lot of own work.

I am less optimistic about that. Is the financing already secured?

Thank you very much! You really put in effort, we appreciate that. Since costs are often discussed, where exactly are the cost advantages here?
Is it because less earthwork has to be done? As it is presented, I assume stilts with point foundations?
How high is the increased effort for the additional base plate (or floor of the house)?

They are strip foundations. Otherwise, you are relatively free with the variant concerning the construction method. The workshop is structurally and constructively significantly more efficient to build.

Hello,

as already announced, here are the raw measurement data of the property. I have also already created a finished IFC file, but it cannot be uploaded here.

Have you ever thought about artificial turf on a foil waterproofing?
Standing seam is way too expensive. Not an option for a flat roof.

Yes, but unfortunately there is a catch:
That would contradict the justification in the development plan, since the purpose there is stated as water retention / habitat for insects.
A maximum allowable slope of 10° is given for the flat roof, which in my opinion would rather correspond to a shed roof...

This brings me to the point, what would you consider an independent roof covering? According to Wikipedia: In a narrower sense, the term roof covering only refers to the outermost component, which is classified according to water permeability into: roof covering and roof waterproofing.

If you look at the typical roof structure with roof tiles, the structure and function are also divided into different component layers.

In your opinion, does only an in-roof photovoltaic system or solar roof tiles count as an independent roof covering? Would a photovoltaic system mounted on aluminum profiles with a roof covering underneath (tiles, metal, foil, etc.) also fall under that? There are numerous possibilities where it is visually hardly recognizable from the outside whether it is such a system or not.

I do not see this in the contour lines shown so far.

I have attached a 3D view to clarify this a little. The bottom edge of the balcony doors just still stick out assuming the original terrain there. Maybe 10 - 20 cm would have to be removed additionally there.

They are strip foundations. Otherwise, with that variant you are relatively free regarding the construction method. The workshop is structurally and constructively significantly more efficient to build.

Sure, strip foundations are practical and inexpensive there. Just roughly, what building construction would you have thought of for the workshop building? I would fear that it could be difficult to ensure sound insulation to the outside there. Typical workshop buildings often use metal and PUR insulation, which have rather poor sound insulation properties.

We originally planned the flexibility that if the workshop should become too small or no longer be used, it could be rented as a granny flat.

That could theoretically also be offered with your variant, but I assume you probably did not plan the outbuilding with energetic standards, right?

Is the financing already secured?

We have already had appointments regarding this, hence the rough budget, but nothing has been signed yet, otherwise we might have to pay additional standby interest until the planning progresses further.

6 m² for woodworking.

Certainly sufficient for cutting out things with a scroll saw or carving figures. But definitely insufficient to produce, for example, a 2x2 m bed completely from rough-sawn boards, let alone a staircase. --> This leads to a fundamental discussion that should not be further deepened at this point.

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I hardly believe that anyone wanted to remodell your site. What is missing here are the dimensions of the property, unless I overlooked that. So how long are your fences and where and in what size is the building area within it? Otherwise, I think everyone here is leaning back and waiting with you for the offers. At the moment, it all still sounds very much like a castle in the air - but only the part underground. The living quality is more than modest for the money.

There has often been discussion regarding a ground-level exit in the basement, whether it would make sense, etc. Therefore the terrain.

If it is only about the external dimensions, they are 27 m in the X direction and 24.95 m in the Y direction (along the street).

The building envelope is only restricted by the clearance areas and the 3 m distance from the east and west boundary. (Light blue lines)

Certainly sufficient for cutting things out with the scroll saw or for carving figures. But to produce, for example, a 2x2m bed completely from rough-sawn boards is definitely insufficient, let alone a staircase. --> This leads to a fundamental discussion that should not be pursued further at this point.

I couldn't have said the last sentence better and feel confirmed in having opted out.

At the moment, it all still sounds very much like a pipe dream – but only the part underground. The living quality is more than poor for the money.

Well, it is supposed to be only an operations manager's apartment as an appendix to a superior high competitive hobby carpentry. It seems to me the OP’s priorities could lead directly to a divorce court in an unforeseen way. In any case, I see the building as belonging in an MI or GE zone and requiring a lottery win.

By the way, my scale suggests that abstaining from popcorn hardly pays off ;-(