Plan living area floor plan

We are currently in the process of (notary is currently drafting the purchase contract) buying a farmstead in Schleswig-Holstein to combine living and working (self-employed with animals) under one roof. As a family of four, we are moving together with my mother-in-law onto the property. The larger residential part is virtually ready to move in and is not up for discussion here. For my mother-in-law, the part of the farmyard currently used as a stable is to be partially converted.
Approximately 80m² are to be used for the apartment, the part facing the courtyard for my wife’s business and/or as a guest WC for farm guests. In the middle of the house, between the old residential unit and the stable, there is an unheated continuous threshing floor. Access to the apartment can gladly be made through here, which can also be used as a hallway for coats/shoes.
I have drawn a draft of how a layout could look, but somehow it doesn’t seem quite right.
Here is the questionnaire, which I have purposefully shortened:

Development plan / restrictions
Plot size: Building structure is fixed, listed building protection, facade may not be significantly altered
Slope: no
Building window, building line, and boundary: see above
Number of floors: Expansion on the ground floor, upper floor is only a hayloft
Roof shape: gable roof
Architectural style: desired - farmhouse / country house / built in the 1880s
Orientation: west and north
Further specifications: Facade is under monument protection. Window and door openings are predetermined. In the middle runs a beam with two load-bearing pillars (circled in red on the floor plan). These cannot be moved. Bottom right is the old milk chamber. The walls from the chamber to the rest of the stable could be removed. The door plan bottom left can be bricked up or fitted with window / patio door.

Clients’ requirements
Number of people, age: 1, newly retired, dog
Space requirement on ground and upper floor: living kitchen, bedroom, utility room corner, bathroom
Office: family use
Overnight guests per year: practically none, because a holiday apartment is additionally available
Open or closed architecture: open
Conservative or modern construction style: conservative (I don’t quite understand)
Open kitchen, cooking island: yes, island possible but not mandatory
Number of dining seats: 5
Fireplace: no
Music/stereo wall: small media corner
Balcony, roof terrace: terrace and garden facing north and west, according to picture, 3D view shows 4:00 pm in summer
Garage, carport: separate, does not need to be considered
Kitchen garden, greenhouse: only terrace and safe dog run

Further wishes/particularities/daily routine, also reasons why this or that should or should not be:

The outdoor area faces north and west, and to the west is the street as well as two large (historically protected) chestnut trees in the garden. My biggest concern is that 1. enough light comes into the house and 2. that there is some sun in the garden. For the latter, there is also a shared backyard with southern orientation.
Behind the wall to the west is the street, outside the town, but little trafficked. The wall is not yet built, but according to the new Schleswig-Holstein state building code, a height of 2 m is permitted.

House design
Who designed the plan:
- Do-it-yourself
What do you particularly like? Why?
Low expansion effort, walls utilize existing posts.
What do you not like? Why?
I would like the door plan bottom left to be open as a second exit, but I have not found any space for media / sofa corner.
Price estimate according to architect/planner: N.A.
Personal price limit for the house, including equipment:
Much will be done by ourselves: drywall construction, floor construction and insulation, electrical work up to connection box.
Preferred heating technology:
Probably a multi-split air conditioning system (4 indoor units, 1 outdoor unit on the hayloft) and wall-mounted hot water heat pump, not using the existing central heating of the house.

If you have to do without, which details / expansions:
- can you do without: everything else is negotiable
- cannot do without: daylight bathroom, open kitchen and dining area

Why did the design turn out as it is now?
e.g. Specifications of the building structure, heritage protection, and requirements.

What is the most important / fundamental question about the floor plan in 130 characters?

How can the living area be planned and divided purposefully without ending up with a large hall and inefficient use of space.

Many thanks in advance :)
[ATTACH alt="Grundriss Stallausbau IST.png" type="full"]76582[/ATTACH]

How high is the ceiling? Where are the connections for electricity, water, and wastewater located? Is the property situated in an outlying area? Is such a reclassification from agricultural land to residential space legally approved in terms of building regulations? Is the brick-built milk chamber structurally significant? Pictures of the current condition could be helpful.

How high is the ceiling? Where are the connections for electricity, water, and sewage located? Is the property located in an outlying area? Is such a reclassification from agricultural land to residential space legally clarified in terms of building regulations? Is the masonry milk chamber structurally significant? Pictures of the current state could be helpful.

The ceiling is currently about 2.8m above the top edge of the base plate. The floor structure should be around 20 cm, the beam is about 20 cm lower. Water comes from our own well, supply line on the plan at the top right, sewage is also drained in this direction, own 3-chamber septic tank. Electricity may get a new house connection, which can be almost anywhere; in my design it would be at the top right of the plan in the utility room/storage chamber area.

The State Monument Office says it is possible under monument protection law; the stable is not worth preserving, only the facade, where there may be requirements regarding the design of the windows.

The property is located in an outlying area.

The State Building Code of Schleswig-Holstein also permits conversion in outlying areas with up to 5 additional residential units, provided that the existing building body is not expanded, no replacement building is undertaken, and no public interests oppose it – so without a monument this can be denied in individual cases. The State Building Code Schleswig-Holstein stipulates that conversion to residential use may not be denied in outlying areas if this is necessary or sensible for the preservation of a monument. Since economic use is no longer given and no longer sensible (cow stable for 10 cows), we have confirmation from the Monument Office that the conversion serves preservation. The building is well known there.

The milk chamber wall can be removed as mentioned; a post would have to remain or be set at the corner, marked with a red circle in the existing floor plan.

I only have interior pictures of the current state from the realtor, so I will not post them here: Concrete slab about 10 cm unreinforced, on it the indicated boxes separated only by wooden walls and steel posts at the corners and at the indicated points in between; the load-bearing ones are those marked with a red circle, these supports a beam. The ceiling is made of double-T girders and filled with concrete in between. Thermal insulation in the ceiling area is planned from above to avoid lowering the room height too much; underneath only about 5-6 cm to cover pipes and reduce the thermal bridge at the wall/ceiling junction. The wall will be insulated on the inside, wood fiber or Multipor; dimensions are internal measurements taking insulation into account.

Cool project!
And do you want to accommodate camper guests overnight and breed alpacas? :D
Anyway: who is the kitchen in the top left for? Also for outside guests?
What goes into the barn? Where do the doors and windows ON the barn lead?
Would you like to sketch what is around it? You can only see the street front.

Sleeping guests per year: virtually none, because an additional holiday apartment is available

But that is supposed to be rented out and bring in money, right?!

And do you want to accommodate camper guests overnight and breed alpacas? :D

I wondered how you came up with that ... they just slipped past on the SketchUp screen :)
We already have alpacas, here there can definitely be a few more. In SH up to 5 camper spots are possible without meeting requirements from the camping regulations and without needing approval.
The bathroom on the plan above is intended for possible camping guests.

Anyway: who is the kitchen in the upper left for? Also for external guests?

No, only for commercial use by ourselves (not for cooking meals/catering, no loud noise and not at sleeping times) with access from outside, not belonging to the apartment. The holiday apartment will have its own kitchen. A lounge for guests will be placed elsewhere, if at all.

What is the Tenne used for? Where do the doors and windows SO of the Tenne lead?

The Tenne is more like a "stairwell." On the other side there is access to our residential unit and to the heating room for our residential unit. Inside is a wood gasifier, but my mother-in-law is supposed to get a separate heating system.
Integrating the Tenne into the apartment is unfortunately not possible. The large gate facing the street must be preserved as such and cannot be replaced, for example, by a glass front. Adding something in front is also not possible because it opens inward.

Would you like to sketch what the surroundings are like? You can only see the street front.

In front is the street, on the left, right and rear is pasture, or "left," meaning the view to the north from the apartment, there are still a few smaller trees and bushes and currently the manure plate. But the garden area for the apartment will go there and the manure plate will be reduced to a tenth, alpacas don’t produce as much manure as cows did before – and it can be used as fertilizer without nitrate contamination in the soil.

But it’s supposed to be rented out and generate money?!

Yes, but it should also be available to family/visitors; income from it is not currently factored into the financing.

I find it strange to go from the bedroom to the bathroom through the kitchen

Is the daylight bathroom mandatory?

I wouldn’t like the wall around the property either.

Don’t you have any pictures? Especially with [Denkmalschutz], the exterior appearance and property design also matter.

The large front door to the [Tenne] should become the representative entrance.