Small Bungalow Floor Plan - Optimization Potential?

Good day,
unfortunately my post simply disappeared again yesterday, so I am trying my luck again.
A brief introduction: I am 48, female, single, and live in northern Baden-Württemberg.

I am still at the very beginning of planning the house construction but already have a plot of land, for which I will sign the purchase contract in the next few weeks.
I want a small, single-story house without a basement with a small garden, low-maintenance without any frills.
It is not foreseeable whether another person could move in someday, so I don't really want to plan for that.
Basically, it would depend on the price what 10-15 m² extra would cost me, since my budget is naturally limited.

Room plan
Kitchen + dining + living + working approx. 40 m²
Bedroom approx. 14 m²
Dressing room -
Work/Guest/Child approx. 10 m² optional
Bathroom + WC approx. 7 m²
Hall approx. 5 m²
Utility room approx. 8 m²
Guest WC -
Storage room -
Total approx. 75 - 85 m²

Questionnaire on the floor plan:

Development plan/restrictions
Size of the plot	392 m²
Slope	North-south gradient approx. 1.5 m over 21 m
Floor area ratio	0.4
Plot ratio	0.8
Building window, building line and boundary	see development plan
Edge development	Boundary distances in the sense of open construction
Number of parking spaces	1.5 (rounded up) per residential unit, therefore 2
Number of floors	II
Roof shape	SD 38-43 degrees, half-hipped roof or double shed roof
Style	?
Orientation	East-West
Maximum heights/limits	8.5
Further requirements	Cistern with 4.5 m³ recommended Garage: with pitched roof or green flat roof, carports? Filling up to 1.8 m allowed
Requirements of the builders
Style, roof shape, building type	Exemption pitched roof to 30 degrees? Bungalow
Basement, floors	1 floor without basement
Number of people, age	see introduction
Space requirements on ground floor, upper floor	Ground floor 75-80 m²
Office: family use or home office?	Home office, integrated in living-dining area
Overnight guests per year	0-1
Open or closed architecture	?
Conservative or modern construction	?
Open kitchen, kitchen island	Kitchen island with a depth like normal kitchen cabinets with adjoining dining table
Number of dining seats	max 4
Fireplace	Undecided
Music/stereo wall	no
Balcony, roof terrace	no
Garage, carport	1 carport, 1 parking space
Useful garden, greenhouse	no
Further wishes/special features/daily routine, also reasons why this or that should not be	- No separate office for home office because I don’t want to spend most of the day sitting in a small room, but rather in the living room with a view of the garden - pull-out stairs to the attic (additional storage space) - wall in the bedroom for wardrobe min. 2.75 m - wall in the living room min. 2.45 m for lowboard with TV - bathtub - questionable whether necessary - larger shower 90x120 m with tiled partition wall (avoidance of glass wall)
House design
Who created the planning:	DIY, based on floor plans from Hanse Haus and various other providers of small houses
What do you particularly like? Why?	Open living-dining-working area in the southern part of the house, utility room not in direct proximity to the bedroom (technical noise)
What do you not like? Why?	Possibly the hall/entrance area quite small
Price estimate according to architect/planner:	?
Personal price limit for the house, including equipment:	250,000-270,000 euros turnkey without base slab, earthworks, ancillary building costs, furnishings and outdoor facilities
Preferred heating technology:	Still unclear, possibly underfloor heating
Further considerations	House length max. 11.5 m because plot width approx. 18 m - carport 3 m - boundary distance 2.5 m, 1 m buffer in case the plot is shorter than 18 m (measured on Boris BW) Carport position can also be on the west side To have as much green space as possible and to counter the slope somewhat: house with long side parallel to the street Currently no preference for solid or timber construction, KFW 55 or 40 or X
Outdoor facilities	- Terrace approx. 15 m² level with the house - Lawn may have slope - Carport with parking space in front
Earthworks	Southern boundary: retaining wall necessary to hold back the slope, neighbors (right and left) have done this with 1.4 m L-shaped stones or hollow blocks, rough earthworker’s offer available (wall, leveling work, compacting and preparations for base slab, base slab, terrace and carport (= crane parking space) graveling, drainage, grounding strap, multi-utility, construction site setup etc. complete approx. 60,000 euros)

Attached is a section of the development plan and a rough drawing of the house (green), carport (blue), and terrace (yellow) on the screenshot from Boris BW.
I also attach my first floor plan attempts (once with the entrance in the north and once in the east). Surely I used the wrong tool for drawing floor plans, but I hope something can still be read or used.
Looking forward to constructive criticism.
Thank you in advance for your time.

You had already commented on my post yesterday - thank you very much for that. Unfortunately, I could only skim your reply before everything was gone. But your suggestion to stay at a 38-degree roof pitch and place the technology in the roof truss stuck with me immediately. That would create more space in the utility room on the ground floor, or it could even be made smaller. Would the ceiling then need to be reinforced/more insulated? (Noise from the technology) Or would that also have an impact on the insulation of the roof? Is something like this even conceivable in a standard house? Or would they be completely overwhelmed by it? Regarding KfW standard: In what way does KfW 40 "not pay off"? Is the heating cost savings difference compared to KfW 55 or the Building Energy Act 2024 house so marginal that it is economically pointless? However, you can already get KNN funding for KfW 55...

Is the heating cost savings difference to KfW 55 or Building Energy Act 2024 house so marginal

Yes, different usage behavior can already make a 40 house more expensive than the 55 (in heating costs).

However, you already get the KNN funding for KfW 55

Am I missing something? What is a KNN funding?

Regarding KfW standard: In what way does KfW 40 "not pay off"?

In my opinion, it does pay off. The extra cost is marginal (if built without certification/funding) and I see 40 as the standard nowadays in my job. Also considering the future and the value of the house later on. Especially with such a small house, 40 and better can already lead to the house being cheaper than a 55 house, because you will not spend the possible savings on heating (we discussed this in the other thread) for the extra energy efficiency.

KNN - take a look here: Thank you very much for your feedback, I see it similarly to you. What is questionable for me is whether the combination of massive construction and KfW 40 (or even tighter) is then directly off the table in terms of cost efficiency? Or what additional effort would be necessary to bring, for example, a Ytong house up to KfW 40? With wood, it is - expressed layman-like - just one more panel in between or the plastic bag.

we have a bungalow. My first thought is, why not rotate the gable roof, you get more standing height, no image of a shack, your south wall is your highlight, open space with skylights. I would use filled bricks as solid material, or carpentry as non-solid. You always need a third small (10sqm) room, or the option to separate it with shelves/light construction. View from outside and view from the open kitchen

thank you very much for your input - great house, I really like it. How do you clean the triangular windows? With the orientation of the house, I had the idea to position the long side parallel to the street in order to have as much green space as possible and to somewhat avoid the slope to the south. And with a roof pitch of 38 degrees, the gable side doesn't look so great, hence the east-west orientation towards the neighbors. But it's true, it then somewhat looks like a barrack from the street view. Since my budget is limited, I don't know if a deviation from "square, practical, good" would be within the budget. And you don't often see the long side of the house as the gable side... I also thought it would be better to have a large roof area facing south since I need to install a photovoltaic system (Baden-Württemberg).