Is the basement cost estimate realistic?

Hello,

there are probably regional price differences, but I consider it impossible to have a basement built for 35K. We are currently building without a basement, but our various neighbors who are building with basements of your size are all around 80-85K. But that's not all, because what all builders have not taken into account is that the electrical work, tiles, etc. really cost a lot of money. They planned for the 80-85K, but with the aforementioned additional work you easily end up at 110-120K.

Two things can basically be said about basement yes/no and how expensive it can be: 1. the decision whether to build a basement is not a matter of taste. The plot speaks quite loudly in this regard. If the plot says it wants a basement, then building a basement is practically at the same price as basement-avoidance substitute measures. I have explained this in detail several times in my "Kellerformel", for which the interested reader should use the search function here ;-) 2. One euro underground has the fixed exchange rate of 1:1 to one euro above ground. Standard costs are the same on both sides of the earth’s surface, so a residential basement has no "discount" compared to above-ground living space, conversely, the jam jars in the extension behind the garage cost exactly as much as in the basement. Basement at basement price has a surface-mounted wired ceiling lamp as a barred lightbulb lantern. The marble bathroom is also available in the basement at penthouse rates.

I read that too, but I just can’t reconcile the numbers. That would mean construction costs of €162k for our basement. Could someone maybe explain where these costs are supposed to come from? Are wet rooms, etc. being factored in here?

For a simple basement, I calculate/have calculated €1000/sqm. By now it’s probably more like €1200, for above-ground living space I calculate €2300. Now you come along with light wells and KfW40... Roughly, I would calculate 25 sqm x €1300 unfinished basement 40 sqm x €1700 finished as living space = that’s exactly €100,000 Then I add my I-am-stupid-and-naive-and-definitely-forgot-something bonus of 10% and end up at €110,000. For financing, I would then state €120,000... if something is overestimated, it doesn’t matter, because the surplus will fill other gaps or can ultimately be used as a special repayment.

Hello,

there are probably regional price differences, but I consider it impossible to have a basement built for 35K.

I have already received such an offer for my area as well. To be exact, it was 34,709 euros (received 5 days ago). But most things were included. PVC foil, ground electrode, base slab, media pipe penetrations, clear interior height 2.2m, waterproof basement, filigree precast ceiling, basement stairs (partly cast in place concrete), four windows with light wells, interior walls masonry, etc. So basically the standard equipment of a usable basement.

Now, in my naive way, I simply started looking at what proper insulation costs (100€ / m² wall or floor area with 20cm XPS), then the floor construction with anhydrite screed + underfloor heating for 120 € / m², floor coverings at 50€/m² -> own work, 1 light well at 14,000 €, 5,000 € for electrical (surface-mounted installation, cables in cable duct in the installation area on the wall is intentional). And then I came to just under 81,000 €. Or am I forgetting an important point here?

I think the problem is that everyone has a different definition of a usable or living basement. For me, the above-mentioned equipment is sufficient so that I can put my office and gym room in it. The ceiling height with 2.2m clear height is also completely adequate.

For me, the above-mentioned equipment is sufficient to fit my office and gym room. The ceiling height of 2.2m clear height is also completely adequate.

What you may personally be satisfied with is partly another matter. An official study is a "living space" and requires, for example, an appropriate escape route, air, light, and the like. Whether you lift weights in a storage room or squat down with a laptop may not be reflected in the floor plan labeling ;-)

The ceiling height of 2.2m clear height is also completely sufficient.

2.2m raw construction height or already including floor buildup?

With 2.2 meters, you are already below the minimum in some state building codes or exactly at the lowest limit for habitable rooms.

Depending on which sport you want to practice, 2.2m can also be too little.