Lower cellar: you have to expect these costs

cellar-tieferlegen cost-

In some old buildings, the basement is often not usable because the room height is too low. The cost check expert explains in detail what lowering such a cellar can cost and what these costs are made up of.

Question: Is it possible to lower a cellar at all - and does it make sense?

Cost check expert: Many old building cellars have a low height - so they are only of limited use or cannot be used as living space at all. The different state building regulations provide different minimum room heights in order to be able to make rooms into living spaces - in most cases this is 2.30 m, but this differs from state to state.

However, since living space is often scarce in many cities, there is often the desire to expand one's own living space or the desire for a separate apartment in your own house. In such cases, this is only feasible if the room height is increased accordingly - simply by lowering the basement.

Technically, this is not possible in every case - the condition of the house and the foundations, but also the overall local conditions sometimes make lowering extremely difficult or impossible.

Question: How much does it cost to lower a cellar in general?

cellar-tieferlegen cost-

Lowering is worthwhile if the basement is to be used as living space

Cost check expert: It is impossible to say that in general. The costs are completely dependent on the local conditions and on what needs to be done in the course of lowering.

If the foundations go deep enough and the house can be lowered, you still have to calculate costs in the area of a new basement - in general you can expect at least EUR 30,000 to EUR 40,000 in most cases .

It is not possible to say exactly what costs will be incurred, since different jobs can be carried out to different extents for each house.

A small cost example from practice:

In a house built in 1920, the basement should be lowered so that a sufficient height in the basement can be achieved. The client saws up the masonry, lowers the walls and lowers the basement floor. At the same time, the necessary sealing work is carried out from the outside. Some pipelines also need to be lowered.

Post price
Lowering the walls EUR 16,500
Lowering the basement floor EUR 11,000
Sealing the walls (carried out in parallel) EUR 7,500
Laying the pipes 6,000 euros
total cost EUR 41,000

Please note that this is just a cost example that only applies to a specific individual case. The cost of another building in a different situation can be completely different.

Our cost example already shows how high the costs can be here. The planning and approval costs for the project were not taken into account here.

Question: Which factors essentially determine the costs when it comes to lowering the cellar?

Cost check expert: Many factors have to be taken into account here:

  • the static conditions in the house
  • the condition of the outer walls
  • the existing foundation depth
  • the soil conditions below the foundations
  • the condition of the basement floor
  • the accessibility of the building
  • the reduction to be achieved (the larger the usually more expensive)
  • the presence of pipelines that must also be lowered

All of these factors need to be considered when estimating the total cost.

Question: What can possibly make these costs more expensive?

cellar-tieferlegen cost-

Moisture in the basement complicates lowering
Expert on cost checks: poor soil conditions and high groundwater levels make the project much more complicated - and therefore more expensive.

In addition, poor access to the building can also make the costs significantly more expensive. It is then not possible to work with heavy machinery here, but a lot has to be done by hand. That too can make the costs extremely expensive.

Question: What additional costs can be incurred?

Cost check expert: First of all, the planning and approval costs, which we have not yet considered in our cost example .

How high these costs can be depends on the local situation. In any case, calculate here with several thousand euros . The static calculations in such a case can be extremely complex.

If the basement is to become a living space, there are additional costs: for example, sufficient light areas (usually 12.5% of the room area) must be created according to the applicable state building regulations. To do this, the existing basement windows usually have to be replaced by larger ones, which can mean enormous costs. Adequate insulation according to the legal requirements (EnEV)
must then also be done in order to achieve the required heat transfer values.

In addition, there is the expansion of the heating to connect the basement, the extension of water pipes and power lines to the basement and, if necessary, the installation of a sufficiently dimensioned lifting system to make it possible to transport the sewage from the basement sanitary area into the sewage pipes.

All of this work then has to be done afterwards. Since the entire project is about as complex as building a new house, you can count on similar costs here: around EUR 1,300 per m2 to EUR 1,800 per m2 of living space. Total costs up to the completion of the basement as living space.

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