Specifications for independent home version 01-01-2025
The following information describes the inputs required for each rule in the WWS calculation according to the 01-01-2025 rules. This ensures correct and consistent data entry into the API for accurate
1. Area of rooms
Inputs needed:
rooms (list of room objects with: surface_area_m2, heated, cooled, is_attic, shared_addresses)
toilet_installed_in_bathroom_or_shower
Included rooms: Living room, other rooms, kitchen, bathroom, shower room.
Not included: Sheds, attics, cellars, laundry rooms, utility rooms, garages, storage rooms, corridors, (play) halls, circulation areas, landings.
Measurement: Measured wall-to-wall at 1.50 m above floor, including cupboards < 2 m², excluding ducts/pipes. Sloped ceilings counted only where height ≥ 1.50 m. Attic rooms count only if accessible by fixed staircase, floor passable, and roof boarded.
2. Surface area of other spaces
Inputs needed:
surface_area_other_spaces
attic_space_area
fixed_staircase
Included: Utility rooms, laundry rooms, sheds, garages, attics, cellars, fixed cupboards, storage rooms (inside, outside, or under the home).
Not included: Arcades, corridors, landings, circulation areas.
Measurement: Same height rule as rooms. Retractable stairs excluded.
3. Heating and cooling
Inputs needed:
no_of_heated_rooms
no_of_other_rooms
Rooms are considered heated if the heating is part of the immovable property. Cooling is counted if installed and fixed.
4. Energy performance
Inputs needed:
energy_label_available
energy_label
energy_index
energy_index_existence
house_type
building_year
energy_performance_payment
inner_surface_area
validity
monument (type: 'national', 'municipal', 'provincial', 'none')
Accepted energy labels: 'A++++' to 'G'.
Accepted house types: 'Eengezinswoning', 'Meergezinswoning', 'Duplexwoning'.
Accepted validity: 'definitive', 'expired', 'estimated'.
If no valid energy label:
Uses Energy Index if available.
Otherwise, uses minimum performance based on building standards of construction year.
5. Kitchen
Inputs needed:
kitchen (list of kitchen objects with: surface_area_m2, heated, cooled, open_kitchen, countertop_length, countertop_with_base_cabinets, features)
investment_for_kitchen_extra_quality
Countertop length measured including built-in sinks, excluding hobs. Extra quality allowed if investment is reasonable relative to upgrade level.
6. Sanitary facilities
Inputs needed:
sanitary (list of sanitary objects with: surface_area_m2, heated, cooled, shower_or_bath_type, features)
list_sanitary_facilities
investment_for_bath_extra_quality
investment_for_shower_extra_quality
investment_for_bath_shower_extra_quality
Accepted facilities: toilet, sink, shower, bath, bath shower.
7. Separate toilets
Inputs needed:
toilet (list of toilet objects with: heated, cooled, wall_hung, washbasin_count)
8. Facilities for disabled persons
Inputs needed:
facilities_for_disabled
costs_spent_for_facilities_for_disabled
disabled_people
Must be tailor-made or statutory subsidized facilities exceeding standard housing provisions.
9. Private and communal outdoor spaces
Inputs needed:
outdoor (list of outdoor objects with: surface_area_m2, private, shared_addresses)
carport
extra_quality_above_100m2
Private spaces: gardens, balconies, terraces (≥ 1.5 m width/depth). French balconies excluded.
10. Parking and charging
Inputs needed:
parking (list of parking objects with: parking_type, surface_area_m2, charging_station, shared_addresses)
Parking type determines base value; charging station is counted separately.
11. WOZ value
Inputs needed:
woz_value
woz_valuation_year
usable_surface_area
living_area_m2
surface_area_other_spaces
building_year
municipality
like_new_construction
attic_roof_is_boarded
attic_space_area
fixed_staircase
corop_area_amsterdam_or_utrecth
Minimum WOZ value (2025): €77,582.
12. Renovation
Inputs needed:
renovation_expenses
renovation_year
Applies if investment ≥ €10,000.
13. Special provisions
Inputs needed:
care_home
doorbell
Care home: must have barrier-free access, emergency call system, communal facilities. Doorbell input for small extra provision.
14. National monument
Inputs needed:
national_monument
If part of a national monument as defined in the Heritage Act.
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