Single-family house 159 sqm - Straight plot - Correctly calculated?

I have to bring up the topic again because we are currently negotiating a property with the grandparents nearby: (South BaWü)

The plan is to reduce the living area to 140 sqm due to the low land costs and add a basement underneath.
(No waterproof basement, no living basement. Only for TECHNICAL/utility room, small office, and storage room)



What do you think, or have I forgotten something?

Honestly, I can hardly believe the basement.
We have a 70k basement and 20k earthworks (basement floor area just under 80 sqm).
The variant with 160 sqm without a basement should be cheaper if the plot allows it.

Do you have an offer for the 1k energy consultant? Depending on the service, that's inexpensive.

Are notary fees/land registry fees also included for the mortgage?

Have you asked the municipality about connection costs?
For us, that's well over 8k.

Water, insurance, and construction electricity for our neighbors were 5k; for us, thanks to a free construction power box, probably 4k will be enough.

Also, a buffer for other possible incidental construction costs like e.g., energy costs during heating phase, fuel costs for construction site trips/sampling, construction toilet, construction fence, bridging interest...

The chimney also seems cheap to me.
For us, just the chimney with the flue already costs nearly 10k. That doesn’t even include the stove.

The exterior is budgeted very low. For terrace, paths, driveway, hedge, the materials will hardly be covered. We only did the subsoil/earthworks simultaneously with the house construction and that already cost 3k for the removal of soil and delivery of gravel. We compacted ourselves.

And with 300k for the house, probably not many extra wishes are possible.

Overall, everything seems rather tight than generous in budgeting. But we are planning with a similar total sum (albeit with a lot of own work) so hopefully the rough scale is correct already.

Hello, according to the bank this is included in the initial calculation. A house without a kitchen wouldn't help much hehehe.

Yes, it just shouldn't become a residential basement. Rather just a utility area and a small office with a guest room. The plot has a slight slope, which would give us the possibility to have access via a 3-step staircase.

Office means windows and power outlets, plaster and flooring, right? So, after all, a residential basement?? What else is the difference from a residential basement?
And an outside staircase also costs quite a bit!
With a slope, you will also have to do at least some landscaping for the outdoor area. That also costs quite a bit right away.

A house without a kitchen wouldn't be much use hehehe.

That's why many builders save and pay for the kitchen out of their cash reserves... hehe

But an office means windows and sockets, plaster and floor, right? So it's actually a finished basement?? What else is different from a finished basement?

Heating?