Sealing basements from the inside or outside: Where are the costs in each case?


Do you watch wet spots in your cellar or is it even puddling? Before the mold enters, you should perform a basement seal. Among other things, the expected costs depend on the type of seal you choose.

Guide values ​​for the sealing work

A damp concrete cellar usually has a leaking joint between the floor and the wall. In this case, the sealing of the cellar is relatively cheap: Pressing from the inside with a sealant costs about 50 to 70 EUR per meter.

Leaking masonry usually requires a seal from the outside, while earthworks are inevitable. Per running meters of excavation are quite cost to 350 to 450 EUR. Whether a more favorable procedure for you comes into question, tells you a specialized civil engineer.

You may be able to seal your cellar from the inside by paraffin injection. The expert electrically heats the wall and then fills it with liquid wax. This procedure costs about 250 to 300 EUR per square meter of wall space.

The advantage of paraffin injection is that the masonry is then immediately dry and the basement reusable. In addition, the earth does not have to be removed around the house. An alternative is sealing with a multi-component gel.

The above prices apply to basements with relatively fresh water damage and do not include the renewal of tiles, plaster and screed. A mold remediation can be considerably more expensive.

Cost example: basement sealing from the outside

A specialist company seals a basement with a 45 m circumference from the outside. The building must also be freed of moisture with a special drying device.

Cost overviewprice
1. Seal cellar from the outside18,000 euros
2. Rent for building dryers, plus electricity620 EUR
total18,620 EUR

Save energy during building drying

A building drying, which stretches over a longer period, can be amply expensive due to the high energy consumption. Use energy-efficient condensation dryers!

Tips & Tricks

A sealed basement can still be prone to condensation. In this case, in your basement rooms, turn on the heater very easily and use a humidity control hygrometer.


Video Board: Waterproofing Basement Walls with DRYLOK® Paint -- by Home Repair Tutor