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 calculationsNo 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 at5.0 / 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
If valid energy label exists: Use energy label multiplier
If energy index exists: Use energy index multiplier ranges
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
Adjust WOZ value if below minimum
Calculate
woz_value_per_m2 = adjusted_woz_value / usable_surface_area
Compare to regional COROP average
Calculate percentage difference
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:
Energy Label Values: Updated 2025 multipliers
Kitchen Countertop: Simplified to 4 tiers (removed complex 5m+ logic for most cases)
Sanitary Facilities: Updated 2025 shower facility points
Outdoor Spaces: NEW PENALTY - 5 points deducted if no outdoor spaces exist
WOZ Minimum: Increased to 77,582 euros for 2025
National Monument: Increased from 10 to 50 points (matching traditional WWS values)
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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