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Cost functions for a cellar ceiling

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These cost functions were empirically determined in course of studies by the “Institut Wohnen und Umwelt” (IWU, Darmstadt, Germany) on the basis of billing details from from about 1200 residential construction projects. The price level of the study is the 1st quarter of 2015. The study amends a prior work commissioned to IWU by BBSR and was funded through the BMUB Climate Initiative.

With the cost functions given below, it is possible to estimate average investment costs for retrofit insulation of cellar ceilings. This is normally carried out independent of maintenance measures so that the energy-related additional costs are equal to the full costs of the measure.

Average values for the investment costs for retrofit insulation of cellar ceilings can be estimated with the following cost function, depending on the insulation thickness. A difference is made between insulation measures including a cover on the underside and those without. The result pertains to one square meter of ceiling. VAT is included.

For ceiling insulations without cover, the following costs result depending on the insulation thickness:

Full costs = 1.25 €/cm ∙ X cm insulation + 30.75 €

For ceiling insulations with cover, the following costs result depending on the insulation thickness:

Full costs = 1.55 €/cm ∙ X cm insulation + 54.25 €

Thus, for an insulation thickness e. g. of 12 cm, the average full costs of the measure for a ceiling without underside cover amounted (at the price level of 2015) to about 46 €/m². If the ceiling is covered, the average full costs of the measure amounted (at the price level of 2015) to about 73 €/m². The real costs in individual cases may deviate from the determined values due to individual preconditions.

The costs functions include the following additional works:

  • dismantling an re-installation of lighting,
  • recesses for pipes,
  • shortening of doors and sheds,
  • moving objects in and out of cellars, and
  • gluing and grinding of insulation panels.

Before carrying out insulation measures, the ceiling construction should be examined with regard to possible moisture damage and its stability. Costs for such examinations and possibly ensuing repair of faults are counted toward the repair costs.

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