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Specifications for non-independent home version 01-01-2025

The WWS points are calculated based on a set of 13 rules for which specific inputs should be added. Before adding the inputs, the following information needs to be read in order to apply the correct input to the API and get the correct calculation of the WWS points.

1. Surface Area of Rooms

1.1 Requirements

Rooms must meet the same requirements as outlined in the 01-07-2024 documentation to be classified as 'room' type rather than 'other' type.

1.2 Calculation Method

  • Points calculation: surface_area (rounded) / shared_addresses / shared_spaces

  • Surface tracking: Also adds to surface_area_rooms_attributable for energy calculations

  • No attic deduction: Unlike 01-07-2024, no explicit attic penalty mentioned for rooms

1.3 Inputs needed:

  • type_of_room (must be 'room')

  • surface_area

  • shared_addresses

  • shared_spaces

2. Surface Area of Other Spaces

2.1 Requirements

Other spaces must meet the same requirements as outlined in the 01-07-2024 documentation.

2.2 Calculation Method

  • Points calculation: surface_area (rounded) × 0.75 / shared_addresses / shared_spaces

  • Attic penalty: If attic_without_fixed_staircase is True, points for that specific item are capped at 5.0 / shared_addresses / shared_spaces

2.3 Inputs needed:

  • type_of_room (must be 'other')

  • surface_area

  • shared_addresses

  • shared_spaces

  • attic_without_fixed_staircase

3. Heating & Cooling

3.1 Heating Points

Points awarded based on space type and heating presence:

Room Type Heating:

  • Standard/sanitary/toilet rooms: +2.0 points

  • Kitchen (not open): +2.0 points

  • Kitchen (open): +4.0 points

Other Type Heating:

  • Standard/sanitary/toilet spaces: +1.0 point

  • Kitchen (not open): +1.0 point

  • Kitchen (open): +2.0 points

All heating points are divided by shared_addresses / shared_spaces.

3.2 Cooling Points

  • Private cooling: Capped at 2 points

  • Shared cooling: Capped at 2 points

  • Open kitchens (room or other) receive cooling calculations twice

3.3 Inputs needed:

  • type_of_room

  • heated

  • cooled

  • shared_addresses

  • shared_spaces

  • open_kitchen (for kitchen blocks only)

4. Energy Performance

4.1 Energy Label Multipliers (2025 Values)

  • A++++: 1.0

  • A+++: 0.95

  • A++: 0.85

  • A+: 0.75

  • A: 0.65

  • B: 0.50

  • C: 0.35

  • D: 0.20

  • E: -0.05

  • F: -0.10

  • G: -0.15

4.2 Calculation Priority

  1. If valid energy label exists: Use energy label multiplier

  2. If energy index exists: Use energy index multiplier ranges

  3. Otherwise: Use build year multiplier ranges

Formula: Multiplier × surface_area_rooms_attributable

4.3 Monument Exception

If the property is a national, municipal, or provincial monument and energy points are negative, set energy points to 0.

4.4 Inputs needed:

  • energy_label

  • energy_index_existence

  • energy_index

  • build_year

  • monument

5. Kitchen Facilities

5.1 Countertop Points (2025 Values)

  • < 1m: 0 points

  • 1m ≤ length < 2m: 4 points

  • 2m ≤ length < 3m: 7 points

  • ≥ 3m: 10 points

  • ≥ 5m AND shared_spaces ≥ 8: 13 points (overrides 10 points)

5.2 Kitchen Features

Kitchen feature points are the same as Part A 2025 values, but are capped at the countertop points.

5.3 Calculation

(countertop_points + capped_kitchen_feature_points) / shared_addresses / shared_spaces

5.4 Inputs needed:

  • countertop_length

  • shared_addresses

  • shared_spaces

  • Kitchen features: extractor_system, induction_hob, ceramic_hob, gas_hob, refrigerator, freezer, oven_electric, oven_gas, microwave, dishwasher, extra_cupboard_space_per_60cm, one_hand_mixer_tap, one_hand_mixer_tap_with_boiling_function, thermostatic_mixer_tap, thermostatic_mixer_tap_with_boiling_function

6. Sanitary Facilities

6.1 Bathroom/Shower Room Points

Toilet Points:

  • Regular toilet: toilet_count × 2

  • Wall-hung toilet: wall_hung_toilet_count × 2.75

Shower Facility Points (2025 Values):

  • Shower: 3 points

  • Bath: 5 points

  • Shower/Bath: 6 points

Sanitary Features: Same features as Part A 2025, capped by shower facility points.

6.2 Separate Toilet Points

  • Base points: 3.0

  • Wall-hung toilet bonus: +0.75

  • Washbasin: +1 (if washbasin > 0)

6.3 Calculation

Total points divided by shared_addresses / shared_spaces

6.4 Inputs needed:

Sanitary block:

  • toilet (count)

  • wall_hung_toilet (count)

  • shower_facility

  • shared_addresses

  • shared_spaces

  • Sanitary features: washbasin, multi_person_washbasin, cupboard_space, power_outlet, build_in_cupboard, complete_separation_of_shower, bath_with_bubble_function, one_hand_mixer_tap, thermostatic_mixer_tap, towel_radiator

Toilet block:

  • wall_hung_toilet

  • washbasin

  • shared_addresses

  • shared_spaces

7. Facilities for Disabled

7.1 Requirements

Points awarded for costs spent on disability accommodations, following the same requirements as 01-07-2024 documentation.

7.2 Calculation

If disability_costs > 0 AND disabled_people > 0: disability_costs / 332.0 / disabled_people

7.3 Inputs needed:

  • disability_costs

  • disabled_people

8. Outdoor Spaces

8.1 Penalty for No Outdoor Space

Important Change: If no outdoor spaces exist, -5 points are deducted.

8.2 Outdoor Space Points

Private outdoor space (shared_addresses = 1 AND shared_spaces = 1): 2 + (0.35 × surface_area)

Shared outdoor space: 0.75 × surface_area / shared_addresses / shared_spaces

8.3 Cap

If outdoor spaces exist, positive points are capped at 15 points.

8.4 Inputs needed:

  • surface_area

  • shared_addresses

  • shared_spaces

9. Common Indoor Spaces

No separate rule. Handled through shared_spaces division in Rules 1 & 2.

10. Communal Parking and Charging Stations

10.1 Parking Type Points

  • Type 1: 9 points

  • Type 2: 6 points

  • Type 3: 4 points

10.2 Charging Station Points

  • EV charging station: +2 points

10.3 Calculation

All points divided by shared_addresses / shared_spaces

10.4 Inputs needed:

  • parking_type

  • charging_station

  • shared_addresses

  • shared_spaces

11. WOZ Value

11.1 Minimum WOZ Value (2025)

Minimum WOZ: 77,582 euros

11.2 Points Assignment (2025 Values)

  • Property value > 10% above regional average: 14 points

  • Property value < 10% below regional average: 10 points

  • Property value within ±10% of regional average: 12 points

11.3 Calculation Method

  1. Adjust WOZ value if below minimum

  2. Calculate woz_value_per_m2 = adjusted_woz_value / usable_surface_area

  3. Compare to regional COROP average

  4. Calculate percentage difference

  5. Assign points based on percentage difference

11.4 Inputs needed:

  • woz_value (entire address)

  • woz_valuation_year

  • usable_surface_area (entire address)

  • corop_region

12. Special Provisions

12.1 Care Home Bonus

If care_home is True: 0.35 × sum_of_points_1_to_11

12.2 National Monument Bonus (2025 Value)

If monument = 'national': +50 points

12.3 Doorbell System

If doorbell is True: +0.25 points

12.4 Inputs needed:

  • care_home

  • monument

  • doorbell

13. Deduction Points (2025 Values)

13.1 Deductions Applied

  • Room area < 8m²: -4 points

  • Glass surface in main living room < 0.75m²: -4 points

  • Lowest window frame > 1.60m above floor: -4 points

  • Access only via landlord's living space: -4 points

13.2 Inputs needed:

  • glass_surface_living_room

  • lowest_window_frame_living_room

  • accessibility_via_landlord

Key Changes from 01-07-2024 to 01-01-2025

Major Updates:

  1. Energy Label Values: Updated 2025 multipliers

  2. Kitchen Countertop: Simplified to 4 tiers (removed complex 5m+ logic for most cases)

  3. Sanitary Facilities: Updated 2025 shower facility points

  4. Outdoor Spaces: NEW PENALTY - 5 points deducted if no outdoor spaces exist

  5. WOZ Minimum: Increased to 77,582 euros for 2025

  6. National Monument: Increased from 10 to 50 points (matching traditional WWS values)

  7. Disability Calculation: Added requirement that disabled_people > 0

Simplified Calculations:

  • Removed some complex attic penalty logic for rooms

  • Streamlined countertop point calculation

  • Clearer separation of private vs shared cooling caps

Input Structure:

Uses the same block-based input structure as 01-07-2024:

  • rooms

  • kitchen

  • sanitary

  • toilet

  • outdoor

  • parking

  • Plus individual feature inputs for rules 4, 7, 11, 12, 13

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