Size
ft²
Gas price
$/m³
Regular house
Construction cost
$/
ft²
Construction cost
$
Heating cost
$/
yr
Highly energy-efficient house
Additional investment
%
Construction cost
$
Heating cost
$/
yr
Investment returns after
years
Passive house
Additional investment
%
Construction cost
$
Heating cost
$/
yr
Investment returns after
years

Passive House Savings Calculator

Use our passive house savings calculator to determine after how many years will the money you invested in a passive house return to you.

If you plan to build a house and wonder whether the additional costs of making it energy-efficient are worth it in the long term, this passive house savings calculator might be just right for you. It will help you choose between a regular building, an energy-efficient house and a passive house project. Read on to learn how to calculate the prospective savings, what is the difference between passive and energy-efficient houses, and how to ensure maximum sustainability of your building.

Energy-efficient house vs passive house

You probably heard a lot of various terms like green buildings, sustainable buildings or passive houses. The main differences between them are:

  • An energy-efficient house is a building that uses less energy than specified in the standards. For example, in Germany such a building has the energy use of maximally 50 kWh/m^2 per annum.
  • A passive house is a building with an extremely low energy use, not exceeding 15 kWh/m^2 per annum. A conventional heating system is not needed in such buildings.
  • A zero energy house has a net balance of energy equal to zero. It doesn't mean that it doesn't require energy at all, but the energy such a building takes from the power grid is equal to the energy supplied to it.
  • An energy plus house generates surplus of energy during a year.

How to calculate passive house savings

  1. Start with the parameters of your house. Determine the total area of your house and the costs of construction (per square meter) of a regular building.
  2. Check with your local gas supplier for the costs of heating. Type the price of gas per cubic meter into the calculator.
  3. Determine the additional costs required to make your house energy-efficient or passive. By default, these values are set to 9% and 15% respectively, but you can change them.
  4. Let our passive house savings calculator do the rest and find how long will it take for the investment to be returned.
  5. You can also use the advanced mode calculator to customize the values such as:
  • how much energy is supplied from one cubic meter of gas,
  • what is the annual energy demand of a regular house and
  • what is the annual energy demand of an energy-efficient or a passive house.

Passive house characteristics

Some sample features of a green building are listed below.

  • Passive houses tend to have a compact structure - it means that the ratio of external partitions area to the volume of the house is as small as possible. Such a structure minimizes the losses of heat through the partitions.
  • Transparent partitions (windows) are used mostly on the southern side, where the solar heat gains and daylighting are highest. No windows are placed on the northern elevation.

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