Interior finishing costs for a semi-detached house in Frankfurt

Hello everyone,

I am planning to build a semi-detached house in Frankfurt am Main. Recently, I found the plot through a developer. Unfortunately, I am not very happy with the total price from the developer, so I am considering buying only the shell from the developer (this way I can save a bit on property transfer tax).
That means: basement made of WU concrete with basement wall sealing, exterior walls inside made of Poroton T7 MW masonry, gable roof 27.5°, exterior plaster, and own interior finishing.
I need heating, sanitation, roller shutters, glazing, electrification, interior walls, and finishing work. My question is generally – can someone maybe tell me from experience what amount I have to expect to complete 160 sqm of living area?
Details:
The house is fully basemented, has 2 full floors, and an attic conversion.
Semi-detached house width 6.6m (incl. walls)
Semi-detached house length 11.5m (incl. walls)
Interior area per floor ~67 sqm (excl. walls but incl. 4 sqm stair area)
Floor height 2.835m (incl. 20cm filigree slabs for concrete ceiling, wall height = 2.63m)
Basement height 2.575m (incl. 20cm filigree slabs for concrete ceiling, wall height = 2.37m)
The layout:
Basement: hall, heating/technical room, washing/drying, hobby room
Ground floor: hall, WC with shower, kitchen, dining/living
First floor: hall, bathroom with tub, shower and WC, bedroom, children’s room, office
Attic: guest room,
The equipment should be “normal,” no overpriced items:
- Air-to-water heat pump
- Underfloor heating everywhere on ground and first floors
- Radiators in basement and attic
- Triple glazing
- Electric roller shutters
- Tiles in bathroom and guest WC
- Parquet on ground and first floors
- Tiles up to 30€
- Naturally secure front door
The developer price for this interior finishing/equipment is approximately 160,000 EUR. In my opinion, it is a bit expensive, isn’t it?

What does your property developer charge for the rest of the house = the shell?
It’s not just 160sqm of living space, the attic [DG], which is not (fully) included, as well as the basement, also need to be finished. Then the question arises, how much window area do you have? Costs for the site management? Who is commissioning the trades? Preferences for the electrical or sanitary equipment? Why mix radiators and underfloor heating?

What do you think is too much about the €160k? Something must have convinced you of this opinion.

Hi Nordanney

What does your developer charge for the rest of the house = the shell?

190 TEUR

It’s not just 160 sqm living space, the attic, which is not (fully) included, as well as the basement also have to be finished. Then the question is, how much window area do you have?

We are planning a Kfw 70 house with about 20 sqm triple glazing

Costs for construction management? Who is putting the trades out to tender? Preferences for electrical or sanitary equipment? Why mix radiators and underfloor heating?

We can of course live only with underfloor heating... Developer offered Topara or equivalent. No smart house - only electric shutters and sockets

What do you think is too much about the 160 T€? Something must have convinced you of this opinion.

The total price for the semi-detached house project is the reason - 350000 EURO

And what does he credit you for?

I don't find the total price directly excessive.

For 160m² plus basement also in FFM, that is probably normal nowadays. We also had 2 contracts with the developer, one for the shell including interior walls (which was significantly cheaper for us) and one for the interior finishing. The interior finishing for 1.5 stories, so classic, and about 135m² living space was supposed to cost turnkey including floor coverings, but without painting and wallpapering work, about 120,000.-, with underfloor heating, heat pump, controlled residential ventilation, and standard electrical installation. By doing a lot ourselves, we saved about 20-25,000 and additionally equipped it better than the "standard." However, we had already signed the contract in 2012; meanwhile, construction prices are said to have risen by about 10% again. In this respect, I find the 160,000.- okay; for the shell, I would, as I said, rather renegotiate...