Hello,
I am currently planning a new build (my first), which is intended to have 2-3 residential units and will likely aim for an energy efficiency rating of 40+. Essentially, it could be called a multi-generational house. Initially, only 2 units will be developed (one on the ground floor and one on the upper floor), but in the future, a third unit is planned for the attic. I would like to leave the attic unit as a shell at first, but have all the connections, wiring, and so on installed. The goal is to avoid any further construction work later so that it can be used as a separate unit.
As far as I know, a separate residential unit requires the following conditions:
- Its own lockable entrance
- Its own electricity meter
- One kitchen connection each
- One bathroom connection each (toilet and shower)
I hope I haven’t missed anything here. If so, please let me know.
Now to my question: To plan a bit better, I would like to get an idea of how much an additional residential unit costs in terms of installing connections for an extra kitchen and an additional bathroom, as well as setting up a separate electrical circuit with its own electricity meter in the utility room. In other words, the extra costs you should budget for when turning a standard single-family house into a house with 2 or 3 units.
For now, I am only interested in the cost of the connections—that is, the potential for an additional unit—not the cost of the kitchen or bathroom fixtures themselves.
I hope you can help. Many thanks in advance for any comments and explanations!
I am currently planning a new build (my first), which is intended to have 2-3 residential units and will likely aim for an energy efficiency rating of 40+. Essentially, it could be called a multi-generational house. Initially, only 2 units will be developed (one on the ground floor and one on the upper floor), but in the future, a third unit is planned for the attic. I would like to leave the attic unit as a shell at first, but have all the connections, wiring, and so on installed. The goal is to avoid any further construction work later so that it can be used as a separate unit.
As far as I know, a separate residential unit requires the following conditions:
- Its own lockable entrance
- Its own electricity meter
- One kitchen connection each
- One bathroom connection each (toilet and shower)
I hope I haven’t missed anything here. If so, please let me know.
Now to my question: To plan a bit better, I would like to get an idea of how much an additional residential unit costs in terms of installing connections for an extra kitchen and an additional bathroom, as well as setting up a separate electrical circuit with its own electricity meter in the utility room. In other words, the extra costs you should budget for when turning a standard single-family house into a house with 2 or 3 units.
For now, I am only interested in the cost of the connections—that is, the potential for an additional unit—not the cost of the kitchen or bathroom fixtures themselves.
I hope you can help. Many thanks in advance for any comments and explanations!
Felix85 schrieb:
One more question regarding insulation and the roof. During the discussion, I understood that insulating the ceiling of the upper floor (i.e., creating a cold roof) versus insulating the roof itself (meaning the possibility to convert the attic) does not differ significantly in price.
If that is the case, why would anyone choose the cold roof at all? I mean: No matter how disadvantageous a hip roof (or any roof type) is for conversion, if insulating the space there causes little or no extra cost, wouldn’t it always be better to preserve this potential? But preserving this potential involves considerable additional costs: staircase, stairwell with walls and door, load-bearing ceiling structure, etc.
All of that costs money. If budget is not an issue, you can do it for the additional storage space created.
I just had a version of the floor plan (there are now X variants and experiments, which is what happens when you try things out) sent to me from home. I’ll upload it shortly.
I wouldn’t want to do that for storage space alone. Only if it could later really become proper living space in the attic.
A comparative calculation like that ("insulation in the ceiling and cold roof" versus "possibility to develop the attic with everything that implies") is essentially what I asked for. It only needs to be rough at first, but that’s the only way I can judge whether it makes more sense to create living potential by raising the hipped roof or to seal off the attic and slightly increase the floor area instead.
If necessary, that’s a task for the architect. Initially, I just hoped there would be enough experience here to make a rough estimate. With the numbers, you could work with more than just “a bit more expensive,” “much more expensive,” and so on.
hanghaus2000 schrieb:I’m not quite clear on that yet. In what way are we talking about 10 m² (108 sq ft) of insulation in a cold roof?
The cold roof doesn’t make much sense in your design. We’re talking about 10 m² (108 sq ft) of insulation here.
hanghaus2000 schrieb:I calculated it differently so far :p but it’s quite possible that I’m mistaken.
However, the attic is not usable. At most for storage or technical equipment. You can’t even stand upright there.
Tassimat schrieb:
Your potential space preservation comes with significant additional costs: staircase, stairwell with walls and door, load-bearing ceiling structure, etc.
It all costs money. If budget is no issue, you can do it for the extra storage space.
I wouldn’t want to do that for storage space alone. Only if it could later really become proper living space in the attic.
A comparative calculation like that ("insulation in the ceiling and cold roof" versus "possibility to develop the attic with everything that implies") is essentially what I asked for. It only needs to be rough at first, but that’s the only way I can judge whether it makes more sense to create living potential by raising the hipped roof or to seal off the attic and slightly increase the floor area instead.
If necessary, that’s a task for the architect. Initially, I just hoped there would be enough experience here to make a rough estimate. With the numbers, you could work with more than just “a bit more expensive,” “much more expensive,” and so on.
hanghaus2000 schrieb:
That's exactly the one I meant. It's a pity. He had built quite affordably as well.... and contributed a lot of his own work, documented the construction extensively with photos, then continued after an unexplained post deletion (and now has probably decided to quit here again due to the same issue). Sad.https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/
Attached is a version of the floor plan. I hope this one doesn’t have the issues from yesterday. I discovered a measurement error back then, which meant I had to revise all three floors again 🙄 Anyway, these are just initial drafts for getting a rough idea.
Here, I’m showing 3 residential units. It’s quite possible that in the end there will only be 2 units, meaning the attic floor wouldn’t be separated (this would require significant replanning, especially for the escape route). In that case, I would move the door to residential unit 2 towards the staircase leading to the first floor, so that the first floor and the attic would form one unit that can be locked separately.
Doors/gates are marked in yellow, windows in blue, and I tried to illustrate canopies in red. One square on the ground floor and first floor corresponds to about 20cm (8 inches), and one square on the attic floor is about 50cm (20 inches). I haven’t added dimensions yet. These can be retrieved from the planning software; the visualizations are still missing.
Edit: This version assumes the attic will be finished immediately (or at least part of it), so that the child has their own space there. Or maybe it will be us, we’ll see 😉 If the attic is not finished straight away, the floor plan on the first floor would be trickier (because then a transitional children’s room would need to be included).
Ground floor:
First floor:
Attic floor:
Here, I’m showing 3 residential units. It’s quite possible that in the end there will only be 2 units, meaning the attic floor wouldn’t be separated (this would require significant replanning, especially for the escape route). In that case, I would move the door to residential unit 2 towards the staircase leading to the first floor, so that the first floor and the attic would form one unit that can be locked separately.
Doors/gates are marked in yellow, windows in blue, and I tried to illustrate canopies in red. One square on the ground floor and first floor corresponds to about 20cm (8 inches), and one square on the attic floor is about 50cm (20 inches). I haven’t added dimensions yet. These can be retrieved from the planning software; the visualizations are still missing.
Edit: This version assumes the attic will be finished immediately (or at least part of it), so that the child has their own space there. Or maybe it will be us, we’ll see 😉 If the attic is not finished straight away, the floor plan on the first floor would be trickier (because then a transitional children’s room would need to be included).
Ground floor:
First floor:
Attic floor:
H
hanghaus20005 Jul 2021 15:12Here is a suggestion from a forum member. Very recent.
https://www.hausbau-forum.de/threads/einfamilienhaus-elw-als-3-parteien-haus.39733/#lg=post-508789&slide=2
https://www.hausbau-forum.de/threads/einfamilienhaus-elw-als-3-parteien-haus.39733/#lg=post-508789&slide=2
hanghaus2000 schrieb:
Here is a suggestion from a forum member. Very recent.I had already looked at this earlier. But thanks for the heads-up!Similar topics