First of all: Thank you very much for the interest and the time invested! :-)
What, what? Why is that? What did they say or not say? Who is supposed to create the plan?
The construction companies of course each offer the planning. After we brought the floor plan, they initially had minor comments which we then incorporated. Afterwards, they primarily adopted what we proposed and did not provide any more useful suggestions.
Oh dear, and they leave you on your own with that? Even some experienced planners struggle with slopes. Trying to solve something here as a layman will, in my opinion, result in botched work. Thinking that the basement saves you from all the slopes of the landscape is a misconception. Besides, there is the financial question and the question of garden design. Let me ask cheerfully: What do you base your terrace on? Is it floating in the air? Or do you really want to pile these huge amounts of material against the slope to get this galactic terrace to the living room? How should the slope from the terrace down to the garden be designed?
The plan so far: The plot is 40m long and drops about 5m in height. We are building the ground floor at street level and are filling in the terrace as well as the parking spaces. We will retain the parking spaces at the back with a retaining wall (but none of the construction companies take that on as a fixed price), and we also retain the terrace at the sides and the rear with a retaining wall. The second level would then be about two meters lower. On the south side of the plot, we would raise and fill in about 1.5m with a wall. There is still excavation material from neighbors on the plot, which we would use for filling.
You have about 1m height difference over 8m. Plus 5m distance to the street – the parking spaces would therefore have to be partly basements if you don’t want a sloped driveway. Your neighbor on the left has already done this, if the cutout is correct. How did he solve it? I’d just ring the bell and invite myself for coffee. A great test to see what you like and what you don’t. Where is his terrace? How is the garden connection? Has he leveled the plot in the building area or also built basements?
We would fill in the parking spaces (hence the retaining wall in the floor plan). Unfortunately, we haven’t met the neighbors yet because we currently live about 4 hours away. But I assume we will get to know them soon. What is “plot” (sorry for the naive question)?
What is intended here for whom? Why 3 children's rooms – I count only 2 children. Is the office also supposed to be a guest room? I don’t see a guest room in the basement. But there is an unnecessary light shaft to illuminate of all things the room on the slope side. That’s putting the cart before the horse. Or did I misread: So the street is above and the house below, right?
The street is "above" and the plot slopes down to the south. An elevated terrace (aka balcony) is not an option for us, so we would have the terrace filled in. Unfortunately, that leaves only one room that can be used as a guest room. In the floor plan, it is currently labeled as "hobby" because we would not initially develop it.
So far we have 2 children. In the future, there may be 3 children and/or an au pair; in addition, the parents live about 3 hours away and come to visit regularly. The guest room would be in use about 12 weekends a year. Initially, we would use the 3rd room on the upper floor for guests – if then either the 3rd child or an au pair arrives, we will develop the room in the basement (turning "hobby" into "guest").
Do you have an alternative suggestion on how to accommodate the guest room in the basement and still avoid elevating the terrace?
Follow-up question: One of the construction companies builds WU basements with waterproof windows which are very expensive. They therefore suggest omitting the light shafts to save money. You need light in the basement anyway, and the ventilation system covers the basement. That seems a bit odd to me. What do you think?
That will be the crux. The 650K is presumably just the house with a standard basement from the manufacturer. But you are on a slope and want to use the basement also as a hobby room etc. Then there are the costs for the exterior design, which will probably still stun you. Terrace, paths, stairs, and retaining walls – those will swallow a significant amount of money.
How do we get an approximate figure here to properly include it in the plan? So far we plan with 650K for the house as well as 73K for additional costs (about 25K for the usual stuff and the rest for making the garden usable).
That brings you to the next question – how do you sensibly use and arrange the rooms in the basement? Can you really afford to build 50 sqm of storage that does not serve any explicit purpose? What hobby deserves a dedicated room of this size? What are these retaining walls supposed to retain anyway? Especially the wall in the south makes no real sense in my opinion.
We are planning an exterior entrance to the basement at garden level in the southeast corner. The retaining wall supports the filled terrace above.
Regarding the floor plan itself, I don’t want to say anything yet – it has no value as long as you don’t fully integrate the plan on the slope. Show the exterior views including slope, paths, terrace + retaining walls.
Fair enough – unfortunately I do not yet have any views showing the garden. As soon as I have put something together, I will get back to you. The construction companies keep quiet about that and only take care of the house.
Best regards
Bastian