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

POST https://api.altum.ai/wws/01012025

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.

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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.

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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.

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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.

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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.

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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.

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7. Separate toilets

Inputs needed: toilet (list of toilet objects with: heated, cooled, wall_hung, washbasin_count)

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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.

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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.

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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.

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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.

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12. Renovation

Inputs needed: renovation_expenses renovation_year

Applies if investment ≥ €10,000.

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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.

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14. National monument

Inputs needed: national_monument

If part of a national monument as defined in the Heritage Act.