Offer for shell construction of a single-family house 170 sqm - Is the price market-appropriate?

You don't have a plot yet?

With 420k you should consider downsizing. It starts with stairs 16 steps * 18.5 cm then you have a floor height of 2.96 m. 170 m2 * 3k = 510k Ends at 140 m2 living area.

Are there plans for this pipe dream as well?

We already own a plot. That means you would lower the clear ceiling height and reduce the construction costs?

Do you already have further offers? What are your wishes regarding electricity, heating, flooring, etc. If the wishes are as costly as the shell construction...

Shell construction €220k Window €40k incl. front door Electricity without KNX or similar €30k Heating air-to-water heat pump with underfloor heating €40k Screed €5k Bathrooms with sanitary plumbing and tiles €45k (1x bathroom + 1x guest WC) Plaster €15k Painter €25k Floors €20k Doors €5k

Your trades should look roughly like this for it to roughly fit. Then, with a normal standard, you are already significantly above your target. If it becomes geothermal heat, KNX or more extensive electrical installation, high-quality and room-height adapted doors, venetian blinds, maybe even two proper bathrooms, etc., it will become significantly more expensive. Of course, there will also be smaller items not mentioned above.

That would then be total costs of €450k as you would estimate. We were somewhat cheaper in our estimates, especially for floors, sanitary and electricity, and end up at €420k. However, we would still like to install a controlled residential ventilation system, as we are uncertain whether we can ensure sufficient ventilation manually over the years.

As a small comparison for us
Electrical including network 28
Sanitary including heating 42
Ventilation in El for 4.5 otherwise 12
Windows and 4 doors 35

all existing offers. We will also end up at 420.

That would then be total costs amounting to €450k, which you would estimate there. We were somewhat cheaper in our estimates, especially for floors, sanitary installations, and electricity, and end up at €420k. However, we would still like to install a controlled residential ventilation system, as we are uncertain whether we can ensure adequate ventilation manually over the years.

No, that is not my estimate. That is my specification just to get even somewhat in the planned direction.

If I had to estimate (which I did earlier somewhere in the thread), I would guess, based on the architecture and your special requests, that it will continue like this for the trades. Anyone building with a nice bay window, straight concrete staircase, extreme ceiling height will also gladly install nice bathrooms or great parquet / large-format tiles. For example, if you choose parquet/tiles for €80-100, your flooring budget explodes.
If you are not satisfied with an air-water heat pump and want a brine-water heat pump, then there will immediately be an additional cost of €10-15k for the drilling. If there are many and large window fronts in RC2 and blinds, and if the front door is to be equipped with a fingerprint or something similar, your window budget will not be enough either.
I would never build today without controlled residential ventilation – if you lack the money for a central system, then at least a decentralized one. Does the shell builder already know about your considerations? He also has to prepare for that.

So I estimate for you around €600k including incidental construction costs, excluding exterior work. For an exact assessment, a clear question is needed. A 170 sqm house can cost €350k or €2.2 million – it all depends on your wishes and/or your own contributions. We don’t know more about the house than its size in this thread.

We already own a plot of land. That means you would lower the clear ceiling height and reduce the construction costs?

Definitely. It should go down quite a bit. Unless the contractor builds the house for you straight from the shelf based on a complete existing plan. You can always ask how much cheaper it will be.

No, that is not my estimate. That is my guideline just to roughly head in the planned direction.

If I had to guess (which I did earlier somewhere in the thread), I would bet that it will continue like this in the trades due to the architecture and your special requests. Whoever builds with a nice bay window, a straight concrete staircase, extreme ceiling height, also likes to install nice bathrooms or great parquet / large format tiles. For example, if you take parquet/tiles for €80-100, your flooring budget explodes.
If you are not satisfied with an air-to-water heat pump and want a brine-to-water heat pump, there is an immediate additional cost of €10-15k for drilling. If there are many and large window fronts in RC2 and external venetian blinds, and the front door is supposed to be equipped with fingerprint or similar, your window budget is not enough either.
I would never build today without controlled indoor ventilation - if you lack the money for a central system, then at least decentralized. Does the shell builder already know about your consideration? He must also prepare for it.

So, I estimate around €600k including incidental construction costs for you, excluding outdoor facilities. For an exact assessment, a clear question is needed. A 170sqm house can cost €350k or €2.2 million - it all depends on your wishes and/or own contributions. We don’t know more about the house than the size in this thread.

Ok, thank you very much for the honest words.
What we have in mind so far for further equipment:
- 60*120 tiles in the hallway and bathrooms
- 1 master bathroom as well as a guest bathroom without a shower
- Wood flooring from Lindura as flooring for the rooms where no tiles are planned
- Air-to-water heat pump planned
- No RC2 windows and no external venetian blinds
- Also no fingerprint at the front door
- Controlled indoor ventilation should then actually be included as well