Rough cost estimate for a single-family house

Dear forum members,
our desired building area is currently being planned and will probably go on sale at the end of the year/beginning of next year. I have started to deal with the many many topics that should already be considered before the construction.
I would like to create a rough plan of the estimated costs of the construction project, which could serve as a basis for initial talks with banks for us. I hope I am not too early and you can still give a little assessment whether the direction is right.
I have already read many of the topics. If I understand correctly, we would arrive at the following figures and ask for information on where we are wrong/have forgotten something. Thank you very much in advance for that.
Here are the numbers assumed so far:
Solid construction method in southern Lower Saxony, city villa 220m² living/usable area without basement, solid double garage with storage room and access to the house, modern building technology (e.g. geothermal energy, heat pump variants, photovoltaics), good equipment quality
- Purchase of land and incidental purchase costs approx. 150,000
- Additional construction costs approx. 50,000
- House construction costs: between 1,500 - 2,000 per m², so 330,000 - 440,000
- Painting and tiling 20,000
- Double garage 35,000
- Kitchen 20,000
(Exterior work would be postponed to the year after construction and not financed, mentally here 25,000-30,000)
That makes a total of 605,000 - 715,000 euros, architectural services not yet included.
We are aware that there have been massive price increases, especially in the last 3-4 years.
But is such a high amount actually to be expected?
Thank you for your assessment!

Imprecise is above all the specification of the living/usable area. Should it be 220 sqm including the usable area? That makes for massive price differences :)

Hello emer, yes, for our first thought experiment we were at +/-220m² above-ground living/usable space, of which 30m² would be utility room and technical room: 1 utility room and 1 technical room on the ground floor, 1 utility room for washing and drying on the upper floor. In addition, there should be storage options under the (hip) roof. In addition, there is the mentioned equipment/storage room at the double garage, which we had estimated at a total of 35,000 (and hope that this order of magnitude is realistic for a double garage with storage room). So with these sizes, about 190m² living space remains. Although I have something buzzing in the back of my mind that according to the new regulations since ..2004..?...WohnFlV... utility rooms also belong to the living space? Anyway, this is the order of magnitude we had in mind so far. Thanks already!

Hello,

yes, at first I can't see any calculation error in your numbers. I can't judge the garage price 100%, but roughly the number should be correct.

If you are "shocked" by the size of the final number, it might be due to the living area. 220 sqm is quite a lot, which of course also brings corresponding additional costs. Therefore, I would first carefully consider what size of house is really needed. Do you really need, for example, 1 utility room and 1 technical room on the ground floor? What if the utility room for washing is on the upper floor? If I assume each room has 10 sqm, I have 30 sqm. Maybe 2x10 sqm is enough? Or 2x5 sqm and 1x10 sqm? Just as an example!

Best regards

Michael

Hello Michael,
thank you for your reply. You are of course right about the large square meter number.

The thing is, we would already be significantly downsizing with this model. Currently, we rent a nice house with over 200m², which also has a full basement and a double garage with storage space under the roof rather than as a room behind it. Compared to that, the size would soon be about 1/3 smaller than it is now.

The problem with such a living space is, once you have it, you use it :-) We have two little princesses who are still small (5 and 1) and will be in our household for a long time, and just for them, we really have massive storage needs (car fleet, toys,...). We are constantly thinking about what we could throw away (entire room furnishings that have found a place in the basement now), but still there is a lot of stuff left over that we use and that should find a place. As an example - we currently have an extra wardrobe area of 5 1/2 m² next to the hallway. In it, we have installed a wardrobe almost 2 1/2 meters long. And it is ALWAYS FULL - with 3/4 of it being jackets and shoes of my children. In the basement, we also have an additional shoe corner (rubber boots, winter boots, snow boots, slippers, sports shoes, flip-flops, sandals for kindergarten, fancy sandals for church, low shoes, bathing shoes, all times 2 :rolleyes: just for the children). Compared to that, my three pairs of shoes are nothing...
Of course, this is luxurious and we have to make compromises.
Besides, we currently live far away from family and many friends, as will be the case at the future residence as well. We have moved a lot and our friends are spread across Germany. It would of course be great to have a sleeping place for visits and an additional shower in the future. That is quality of life for us, sitting in the evening with friends on the terrace and easily accommodating them in the house (at the moment, even 2 families can visit at the same time). I really enjoy having visitors in the house...
And then there are considerations about old age. It would of course be super if the house offered an extra room on the ground floor with an extra shower, which today are for the visitors but later would be large enough to get through the bedroom with a wheelchair and through the shower.

As I said, at the moment we are in a stage where we formulate our wishes and roughly price them; cutting down because of the budget will surely come later. :)
Best regards!

I think that you will manage very well with the budget and will get a superbly equipped house. In my opinion, you should rather stick to the lower estimate, as long as you negotiate properly with individual trade contracts.