Cost estimation for the planned duplex house

Hello everyone,

we are planning to buy a fully designed semi-detached house from a developer. We have already had several talks with the developer, so the project is already quite concrete.

However, I am currently having difficulty estimating whether the estimated costs are realistic, cheap, or expensive.

The following data:

Flat roof
~153m² living space (ground floor & upper floor)
~76m² basement
~40m² double garage (masonry) (6m * 7m)
Gross volume (including basement & garage) ~1100m3

The cost for this is 370,000€

If I divide the cost by the gross volume, I get ~336€ / m3. This would be (as far as I have read on the internet) quite acceptable, but subjectively the costs seem relatively high to me.

Thank you very much for your assessment.

Best regards Roy

The volume is composed as follows:
EG+OG: ~660m³
KG: ~290m³
Garage: 150m³

With or without land? Location? Equipment? Without further details, it will remain very vague ...

Hello,
there are still quite a few details missing regarding the construction method and equipment.
We are building with [Massivbauweise], KfW 55, semi-detached house, pitched roof with finished attic, so 3 floors + basement, heat pump with underfloor heating, electric roller shutters, photovoltaic system with battery, tiles or vinyl flooring in all rooms. Calculated 140 sqm without basement, 660 cubic meters with basement. A few extras like walk-in shower etc. and we are at 335TEuro. No garage, sewer connection and outdoor facilities are not included in the price. About ~10T extra wishes for electrical work will also be added.
Best regards, Malli

Plus land (~200,000€) which is appropriate for the location (although in the upper average)

I would say the fittings are upper(?) mid-range.

Built in Bavaria
Solid construction. High-hole bricks 36.5 cm thick, filled 0.08
Floor slab 25 cm on 10 cm perimeter insulation
Flat roof with flat roof waterproofing on thermal insulation / continuous parapet (titanium sheet)
Plastic windows triple-glazed (0.6 W/m²K / window element 1.0)
Roller shutters with motor
Hollow core doors inside
Front door up to 2500€ included
Underfloor heating additional 5000€
Floor covering up to 50€/m² included
Sanitary objects up to 8000€ included
Either gas heating with underground tank and solar thermal (4 m²) or pellet heating included (by the way, which is more recommendable?)
Exterior rough grading
Garage with electrically operated sectional door

A primary energy demand of 0.22 kWh/m² is stated

If further information is needed, I can gladly provide it.

THANK YOU very much in advance!

: Thanks for the info, is the plot of land included in the 335T€? If yes, how much does it cost?