ᐅ Concrete basement versus masonry basement?

Hello dear forum members,

Our house planning is slowly becoming more concrete.
First of all: We have a plot with a 2m (6.5 ft) slope within the building zone, and we have decided to build the basement as a lower floor/livable basement. The plot rises from the street side, meaning the front part of the basement is fully above ground. At the rear side facing the garden, the basement is completely underground.

Now we are struggling with the offers. A concrete basement is about 15,000 euros more expensive than a masonry basement with drainage. According to the soil report, we basically don’t have groundwater or slope water.
An architect said she would build with a concrete basement — the chance of a damp basement is relatively low then. A basement builder I spoke to said that a well-constructed masonry basement also cannot become damp.
Various providers told us that drainage is more labor-intensive. The basement builder said that usually you don’t have to worry about it at all.

Now we are naturally uncertain. 15,000 euros is a lot of money. What real advantage does a concrete basement offer? The fact that it takes 4 or 6 weeks to build is not really important to us.

What are your experiences and what would you prefer?

I tend to prefer the basement builder option. If there is no groundwater or soil water pressing against the structure, it hardly makes a difference.
A concrete basement only has an advantage if it is a waterproof concrete shell ("white tank") – plain concrete doesn’t really offer much.
Properly installed drainage is also not labor-intensive. You might flush the pipes occasionally or check the inspection chambers once a year.

Lumpi_LE schrieb:

I tend to prefer the basement builder in this case. If there is no layered or groundwater pressing against it, it hardly makes a difference.
A concrete basement only has an advantage if it is a waterproof concrete structure – just plain concrete doesn't really help.
Properly installed drainage is not very labor-intensive. You might flush the pipes occasionally or check the inspection chambers once a year.

Is it generally necessary to flush the pipes and inspect the chambers, or is this more of an optional action, with intervention only needed if there is actually a problem?

-Watertight basement without coating
-no drainage (for what purpose?), it will just get clogged anyway

It will probably be somewhat cheaper that way. A masonry basement carries significant risks; you might not get it properly waterproofed, and after 20 years your waterproofing will likely fail.

Thanks for the response!
Am I correct that a WU basement is a concrete basement with a waterproof tanking system?

Why is it without drainage? And why is a masonry basement considered risky? Could you please explain that a bit more?

Without exception, all the general contractors we contacted clearly told us that they only build waterproof concrete basements, not masonry ones. The latter are more expensive, but they want to avoid any future disputes. Also, if you take the soil surveys seriously, hardly any surveyor will definitively rule out the possibility of water pressure from the outside.