Cost indicators
Depending on the supply chain partner handling the installation of measures it is possible to overwrite default values in regards to costs and calculations when given as input.
General assumptions 2025
fixed_gas_price
float
Fixed gas cost.Transporttarief + vast leverlingstarief
337,89
In €/year
variable_gas_price
float
Variable price exc. tax. Variabel leveringstarief contractprijs
0.6595
In €/m^3
energy_tax_gas
float
Energy tax on gas
0.69957
In €/m^3
fixed_electricity_price
float
Fixed electricity price. Transporttarief + vast leveringstarief
575.76
In €/year
variable_electricity_price
float
Variable price exc. tax. Variabel leveringstarief contractprijs
0.1470
In €/kWh
energy_tax_electricity
float
Energy tax on electricity
0.12286
In €/kWh
fixed_heat_price
float
From Vattenvall, tarifs 2025
760.77
In €/year
energy_tax_heat
float
Tax on consumed external heat
0
In €/GJ
variable_heat_price
float
From Vattenvall, including, rent afleverset
43.79
In €/GJ
tax_credit
float
Vermindering energiebelasting
635.19
In €/year
feed_in_compensation
float
Earnings per kwh fed back in the grid
0.1331
In €/kWh
feed_in_cost
float
Cost per kwh fed back in the grid
0.125
In €/kWh
fixed_solar_panel_cost
float
Yearly extra charge from electricity supplier if you have solar panels
0
In €/year
netting_percentage
float
The fraction of produced electricity that is returned to the grid (and will count towards salderingsregeling.
0.65
%
gas_yearly_price_increase
float
Expected percentage increase in gas price
0.03
%
electricity_yearly_price_increase
float
Expected percentage increase in electricity price
0.02
%
external_heating_yearly_price_increase
float
Expected percentage increase in external heating price
0.03
%
term
integer
The term in years used for calculation return on investment
25
In year
discount_rate
float
Discount rate (~inflation) used in return on investment calculation
0.04
%
tax_rate
float
General VAT
1.21
%
custom_costs
dict
TBA
{}
Custom costs TBA
Input schema
"custom_costs": {
{
"code": 0,
"value": 0
}}Improvement costs per measure TBA
All numbers from Material are Euro values, excluded of VAT. Download PDF for all possible default values to overwrite for the measures.
Note: all costs for insulation and glass are per square meter(m2).
Code
Description
Material
Work
Saving Material
Saving Work
10001
Wall insulation to type ''Matig/na-insulation''
22
14
20
13
Column descriptions
Input
Format
Description
Translation
material
integer
Total investment cost per unit for material (excluding VAT).
Kosten totale investering per eenheid voor materiaal (exclusief BTW).
work
integer
Total investment cost per unit for the labor (excluding VAT)
Kosten besparingsdeel van de investering per eenheid voor arbeid (exclusief BTW).
saving_material
integer
Cost-saving part of the investment per unit for material (excluding VAT).
Kosten besparingsdeel van de investering per eenheid voor materiaal (exclusief BTW).
saving_work
integer
Cost-saving part of the investment per unit for the labor (excluding VAT).
Kosten besparingsdeel van de investering per eenheid voor de arbeid (exclusief BTW).
Input schema
"improvement_costs": [
{
"code": 0, # code of a certain type measure, see General assumptions
"material": integer,
"work": integer,
"saving_material": integer,
"saving_work": integer
},
...
]Input example
"improvement_costs": [
{
"code": 50001,
"material": 57,
"work": 128,
"saving_material": 53,
"saving_work": 119
},
...
]Saving work and -material numbers explained
The saving_material and saving_work variables per part concern the saving part of the investment, split into material and labour. This affects the final calculation of CO2 emissions and the ELG.
saving_material: cost saving part of the investment per unit for material (excluding VAT). saving_work: cost saving part of the investment per unit for labor (excluding VAT).
As a rule, the savings share is on average 92.5% (between 90 and 94%) of the investment in material and labour.
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