ᐅ Demolition of Old House – Basement Remains – Building a New House on Top?

Hello community,

I would like to ask for your opinions and experiences once again.
There are no available building plots in our area, and the houses on the market are overpriced.

We could now buy a house from 1955 with about 100 m2 (1,076 sq ft) of living space.
The location is unique for us. The plot is 720 m2 (7,750 sq ft). However, the condition of the house is poor.
If we were to renovate, we would need to add an extension or raise the roof.
Everything else would require a complete gut renovation, as nothing has been done since 1955.
We estimate costs of at least 400,000€.

We would then demolish this house. Does it make sense to keep the basement during demolition? Currently, the basement is about 75 m2 (807 sq ft). The basement also needs a full renovation but is dry. The ground floor of the new building would cover around 110–120 m2 (1,184–1,292 sq ft), while the 35–45 m2 (377–484 sq ft) without a basement would have new floor slabs. Could this save costs?

Is it possible to build a new solid or prefabricated house on the old basement ceiling/floor slab?
For the new construction, we are planning a house with approximately 180 m2 (1,938 sq ft) of living space. What costs should we currently expect for this?

Thanks for all your tips, experiences, and cost estimates.

Flo1990 schrieb:

We are planning a new build with a house of about 180m² (1,940 sq ft) living space. What kind of costs should we currently expect?

550,000 just for the house. Without demolition and additional costs. You should plan for around 650,000 all in, as you might need powder coating for the basement (basement renovation will be extra).
With that, you will have a somewhat “overpriced” new build.

Flo1990 schrieb:

The basement also needs a complete renovation, but it is dry.

So, what is it then: intact or in need of renovation?
Please share some pictures (including the house exterior).

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Thank you for your responses.
I am also worried about ending up with an overpriced new build. However, in our region, it seems we have no other option. We have been watching the real estate market for six years. There are no building plots or new development areas available, and houses are overpriced. So far, we have never had such an opportunity with an affordable demolition property.

The owner has explicitly prohibited the publication of any photos.
Next week, we will inspect the basement with a specialist company. We expect to receive an assessment regarding basement renovation and structural integrity for a new build.

I would just like to have an idea in advance of the effort and costs involved in building a new house on top of an existing basement.

And if anyone here has already gained experience with this.

We had a similar situation. In the end, everything was demolished, leaving only part of the excavation pit, and the house connections for water, electricity, telecommunications, etc., were scaled back in a way that allowed them to be reused.

Flo1990 schrieb:

We have been watching the real estate market for 6 years. There are no building plots or new development areas, houses are overpriced.

Does that mean you have just observed the continuous price increases without taking any action?
That you have been paying house prices for six years?
Then they probably weren’t overpriced, and now you are in a situation where you are starting after six years and have to pay much more than six years ago.
You will have to get through it. You already have a rough initial estimate = purchase price + 650,000 + basement renovation.

I would be interested to know the cost of the house and what land prices are like in your area.