ᐅ Floor Plan Design for KfW 40 Single-Family Home in an Established Residential Area with Fully Finished Basement

Created on: 11 Aug 2025 20:39
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AnnaChris88
Hello everyone,

After reading many posts here and following the discussions closely, we would like to use the collective knowledge and your input to reconsider our design. Attached are the basic data.

Development Plan / Restrictions
Plot size: 414 sqm (4455 sq ft)
Slope: hardly any – 1.5 m (5 ft) gradient from northwest to southeast
Site occupancy index: 0.4
Floor area ratio: 0.8
Building envelope, building line and boundary: entire plot buildable, including a 4 m (13 ft) wide strip along the eastern property boundary, parcel 743/22
Edge development:
Number of parking spaces: 2
Number of floors: 2 full stories mandatory
Roof type: 28-degree (28°) pitched roof mandatory
Architectural style: classic
Orientation: south/west
Maximum height / limits: none
Other requirements:

Owners’ Requirements
Style, roof type, building type: classic with pitched roof
Basement, floors: finished basement, 2 full stories
Number of occupants, ages: 4 persons (42, 37, 3, 1)
Room requirements on ground floor and upper floor: as in current design
Office: home office
Occasional overnight guests: few
Open floor plan
Conservative building method
Open kitchen with island
Number of dining seats: at least 6
Fireplace: no
Music / stereo wall
Balcony, roof terrace: originally planned above the terrace, canceled for cost reasons
Garage / carport: garage for storage purposes

Additional wishes / special features:
- There should be a large living-dining area separated from the stairwell by a door (sound insulation), a large kitchen with island, one bathroom with shower in the basement including two rooms to likely be used when the children move to the basement later; currently playing room and office/guest room, separate walk-in wardrobe from master bedroom, two large children’s rooms upstairs each larger than 15 sqm (160 sq ft)

House Design
Design by: architect and DIY
What do you particularly like?
- Ground floor is especially liked due to the combination of a large room with clearly defined areas
What do you dislike?
- Bathroom layout upstairs is not optimal so far, since window should actually be larger and face east
- Master bedroom should ideally be separated from children’s bathroom or walk-in wardrobe
- Window of guest WC faces north and not next to entrance door
Price estimate based on initial offer: €500,000–520,000
Personal price limit for house including equipment: €550,000
Preferred heating technology: heat pump with photovoltaic system

If you had to give up something, which details or additions
- You could give up: pantry on ground floor
- You cannot give up: separate walk-in wardrobe upstairs, shower bathroom in basement, door to hallway on ground floor

Why is the design like this? For example:
First discussion with architect and 7 rounds of “corrections” / revisions based on our wishes

We look forward to your feedback!!


Floor plan of a house with hallway, bathroom, guest/playroom, office and heating/technical room.


Floor plan of a house: living room, dining, kitchen, hallway, cloakroom, WC, storage room, garage


Floor plan of a house with stairs, hallway, bathroom, walk-in wardrobe, bedroom, child 1, child 2 and garden.


Cross-section of a multi-story house: living/dining, office, hallways, stairs, garage, tree outside.


Two-story white house with pitched roof, entrance, garage and green front garden.


Two-story white house with gray roof and surrounding trees.


Front view of a two-story residential house with pitched roof, large windows and garden.


Two-story house with metal roof, staircase in floor plan and trees in background.


Property map: parcels 743/9, 743/22 (WBF) with gray residential/garage buildings; red boundary line.


Plot plan: building with gray roof, lawn, trees, boundary lines and north direction.
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hanse987
12 Aug 2025 00:36
How large should the light well be? Try drawing the correct size into the floor plan.

I assume the light well is also meant to be in front of the study window; in that case, you will need fixed glazing or a railing above it on the ground floor.
11ant12 Aug 2025 00:41
hanse987 schrieb:

How large is the light well supposed to be?
I only see it in a cross-section.
https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
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ypg
12 Aug 2025 01:04
11ant schrieb:

By the way, there’s something wrong with the file formats of your drawings—they try to download immediately but then can’t be opened.

I’m having the same issue and thought it was just my software that can no longer open them.
A
AnnaChris88
12 Aug 2025 11:45
11ant schrieb:

Infinite Monkey is very popular among the "CAD architect generation" and their clients, but in my opinion, it is not a recommendable design method; I prefer a preliminary design (only after the translation of the room program into a building volume has been conceptually "mathematically balanced" do I start drawing) as a clean code foundation. Starting directly with the design phase is basically like "starting off in third gear" and regularly produces quirks such as combined or completely omitted originally essential elements. To me, this seems like the work of a budget architect (design phases 1 to 3).
By the way, there is something wrong with the file formats of your drawings; they attempt to download immediately but are then unreadable.

Seriously, with a circle around it?
Yes, with a circle around it 😉
Arauki11 schrieb:

I haven’t calculated the area separately, but that is quite a lot of square meters, and I wonder if the costs will really match up.

In my opinion, 1.5 meters (5 feet) on such a small plot is already quite substantial, which will again increase the costs for the outdoor area. Have you considered that?
As with every one of these designs, I ask myself about the necessity of an expensive basement, especially since, as you write, you want to place it on an almost flat plot. The intended use has been discussed many times, and opinions differ widely just based on the huge size of 23.5 sqm (253 sq ft) for the technical room and the extra basement playroom or future use by the children.
At first glance, I can well imagine your needs being met in a house without a basement, especially considering the mentioned budget. In the floor plan, in my opinion, square meters are just thrown around and in the end, you get rooms that are large but difficult to furnish.
Please enter your actual furniture with measurements, and then you will already see some critical points. Surely you don’t want to furnish the living room as drawn.
Who prepared the cost estimate?
I personally wouldn’t like the endlessly long corridor at all.
The "T" in the bathroom is also commonly chosen, but here again it is rather disturbing.
I don’t know if it’s just because of the missing, real furniture, but to me it looks like a standard floor plan was simply stretched a bit to make it bigger, without any clear benefit to living comfort.
The island is more of a tiny island, and the currently popular pantry behind the kitchen cannot have come from a detail-minded architect. Place furniture with real dimensions and you will see.
Start with proper furnishing to see how it really feels!
Thanks for your feedback! The technical room is only that large because it is meant to combine the technical/storage room and utility room in one. Best regards
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AnnaChris88
12 Aug 2025 11:50
ypg schrieb:

About the floor plan itself.
The classic layout usually works. However, I find the cloakroom niche for four people too small. The hallway feels too narrow to me. I would try to create a sense of openness in the living area to address this.
Upstairs, you could do without the hallway extension and still have doors for the children’s rooms.
If you definitely want to build a basement into the slope, you will need to reduce the floor area due to budget constraints, but it should be feasible.
I would plan the children’s floor upstairs and the parents’ floor in the basement. Upstairs, you could also include a small bedroom (guest, hobby), which for now, while the children are still young, can serve as the parents’ bedroom. The bathroom can be larger. The T-shaped layout is space-consuming here.
Regarding the toilets in the T’s, it should be mentioned that it’s not easy to care for a toddler with stomach flu or on other days.
Keep in mind that the row house on your south side has the driveway to the courtyard.

Thank you for your input. You’re right about the hallway—I’m considering sacrificing the pantry and dividing that space between the hallway and the kitchen. The hallway extension near the children’s rooms resulted from my husband wanting the children’s room entrances further away from the bathroom.
Do you have any suggestions for designing the upstairs bathroom without the T-shaped layout?
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AnnaChris88
12 Aug 2025 11:52
hanse987 schrieb:

Is the space in front of your garage even accepted as a second parking spot?
I think so. The development plan from 1973 doesn’t require a parking space. Instead, a 5.5 m (18 feet) distance from the street must be maintained in front of garages. We could also leave the space unmarked.