Single-family house: Is this cost estimate realistic?

Hello everyone

We would like to have a single-family house built. For this purpose, we have, among other things, obtained an offer from an architect. The plot of land is available.

Here are the key data for the house:
Single-family house without basement: 153 sqm
House type: city villa with hipped roof, anthracite-colored bricks,
with roof access window and ladder
Windows: anthracite-colored windows
each children's room has a floor-to-ceiling window without balcony door
double balcony doors in the living/dining room
Tiles: in the guest WC, bathroom, and kitchen
Sanitary facilities: showers on the ground and upper floors should be walk-in, i.e., level-access, shower walls masonry and tiled.
Solar system for domestic hot water heating
Heating: gas condensing boiler (buffer tank: 500 liters? or less?) underfloor heating

Unfortunately, I cannot upload floor plans.
Please also take a look at the cost breakdown from the architect—is it realistic? The point about heating/sanitary seems set too low to me, but I am not an expert. What about the rest—does anyone here have experience? I am grateful for any response!

What comes to mind quickly:
- Incidental building costs
- House connection (water/sewage/gas etc.)
- Financing costs (e.g. interest during the construction phase/possibly commitment interest)
- Kitchen (?)

- Planning costs of the architect according to HOAI

A good overview of all trades is also provided here by DIN276.

Hello,

thank you already for the answers.
I have the ancillary construction costs in a separate list; here I come to about €50,000 (excluding the plot). The architect's planning costs are also listed in the cost statement; however, I have blacked them out because I am really only concerned with the costs for the house.

So, just to clarify, I am really only interested in the individual items of the architect; are the costs realistic, especially when considering the price increases this year?

Are these net or gross prices in the cost breakdown?

The point about heating/plumbing seems set too low to me

Hmm, tiles will come separately. On the other hand, you already have two showers in the plan. It might be tight. I think 10,000 euros for electrical work for an entire house is also not exactly generous. Of course, it depends a lot on the client's wishes. Do you have a common understanding with the architect regarding the standard of equipment (basic, upscale, luxury)? What construction costs result per square meter of living space? It’s best if you discuss your concerns with your architect.