ᐅ Building plot 1.5 meters below street level – basement: yes or no?

Hello everyone,

After initially planning the floor layout without a basement, we have now received the ceiling height plan from the building authority (see attachment).

It shows that our building plot (new development area) will be located 1.5m (5 feet) below street level. According to the development plan, raising the ground to street level is permitted.

We definitely plan to do that! Being below street level, especially as the last plot on a slope, doesn’t seem ideal during heavy rain...

Given these conditions, I almost have to build a basement, right? Otherwise, I would have to raise and compact the entire plot... That would be madness!

Excavating the basement should also be cheaper since it wouldn’t be so deep and there would be little or no soil to remove... Am I correct?

What do you think?

There will definitely be plots in the development area (if it’s reasonably large) where you can make use of excavated basement soil. At least, that’s how it is in our case. Our plot needs to be raised by about 80cm (700 sq meters (7,535 sq ft) of garden), and so far we have collected around 5 truckloads of fill soil. This also benefits the other families, as they don’t have to pay for the removal of excavated soil from basement excavations.

But this only applies to the garden. Under the house, you will need to buy gravel.
For 1.5 meters (5 feet) under the house, you can expect to pay around €15,000.

We filled an average of 1.10 meters (3.6 feet) over 300 square meters (3,230 square feet) and paid €12,000 including delivery, compaction, and plate load testing. The biggest advantage is no standing water around the house. In total, nearly 750 tons of a gravel/sand/crushed stone mix were required.

Der Da schrieb:
At 1.5m (5 feet) under the house, you can expect around €15,000.

I suspected that scale, to be honest! Just to begin with...

My plan was to get two quotes.
One with a basement, one without.

But with that amount, I can almost skip that...

Um, the basement will ideally cost you around 30,000 euros, excluding groundwork. In addition, there are the earthworks, which have to be done anyway.

Our earthworks were also very expensive, but the cost of a basement would still have been higher.

Well, those who have, have.

For us, it unfortunately would not have been an option.