NCC 2022 to 2025 Changes Building Codes & Rules

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Waterproofing

Part F3 (External Roof & Wall Cladding) merged into F1 (Surface Water Management, Rising Damp & External Waterproofing)
Grades, Setdowns, Hobs & Membranes to external concrete structures

External Waterproofing & Drainage

NCC 2025 V1

NCC 2025 Vol 1, F1D4 (1)

NCC 2025 Vol 1, F1D4 (2)

NCC 2025 Vol 1, F1D5 (2)

NCC 2025 Vol 1, F1D5 (1)

NCC 2025 Vol 1, F1D6

NCC 2025 Vol 1, F1D4

NCC 2025 Vol 1, F1D10

≥ 1:80 grade to Drainage Point in the Structural Substrate to a concrete Roof, Balcony etc^{NCC 2025 Vol 1, F1D4 (1)}
The Drainage Point must be connected to Stormwater
The membrane must be applied to the structural substrate
Planter boxes may still use screeds to achieve localised falls^{NCC 2025 Vol 1, F1D4 (2)}
≥ 70mm Setdown from internal floor & Integral Hob to the perimeter of a concrete Roof, Balcony, Podium etc^{NCC 2025 Vol 1, F1D5 (2)}
The Structural Substrate to any Roof, Balcony, Podium etc must be
Concrete, or Fibrecement Sheet^{NCC 2025 Vol 1, F1D5 (1)}, &
Smooth & clean to accept a Membrane^{NCC 2025 Vol 1, F1D6}
Exposed Joints in concrete structures must be^{NCC 2025 Vol 1, F1D4}
Located at high points &
≥ 50mm Hob to both sides of Joint
Surface finishes must be free draining or directly fixed to the Membrane^{NCC 2025 Vol 1, F1D10}

Part F3 (External Roof & Wall Cladding) merged into F1 (Surface Water Management, Rising Damp & External Waterproofing)
Grades, Setdowns, Hobs & Membranes to external concrete structures

Fire

Carparks to have open deck & other concessions removed
Exit Lighting to Include Hybrid type photoluminescent exit signs^[1]
Fire Hazard Property improvements to allow assessment of a similar tested product^[2]
Fire Isolated Exits with clearer re-entry into building

Fire Sprinklers in Carparks

NCC 2025 V1

NCC 2025 Vol 1, E1D9

NCC 2025 Vol 1, S5C19

NCC 2025 Vol 1, S5C22

NCC 2025 Vol 1, S5C19

Fire Sprinklers required on all Carparks (now including Open Deck) with^{NCC 2025 Vol 1, E1D9}
≥ 40 Spaces, or
≥ 1 Carstacker
FRL concessions removed for
Open Deck Carparks in Type A & B Construction buildings^{NCC 2025 Vol 1, S5C19NCC 2025 Vol 1, S5C22}
Sprinklered Carparks below another Building Class in Type A Construction buildings^{NCC 2025 Vol 1, S5C19}

D3D27 Re-entry from Fire Isolated Exits

NCC 2025 V1

NCC 2025 Vol 1, D3D27

In any Storey ≥ 25m Effective Height, re-entry to all floors must be allowed^{NCC 2025 Vol 1, D3D27}
Building Class 2, 3, 6, 7a & 9
All doors require a Fail-safe unlock when Fire Alarm activated
Every ≥ 4 Floors must always be unlocked
Signage & or Intercommunication / alarm system to doors on at least every 2nd Storey & must guide a person to the unlocked door from within the enclosure

NCC 2025 Vol 1, E4D8 (a)

NCC 2025 Vol 1, A5G6

Carparks to have open deck & other concessions removed
Exit Lighting to Include Hybrid type photoluminescent exit signs^{NCC 2025 Vol 1, E4D8 (a)}
Fire Hazard Property improvements to allow assessment of a similar tested product^{NCC 2025 Vol 1, A5G6}
Fire Isolated Exits with clearer re-entry into building

Comfort

Condensation
Climate zone-specific revisions to Membrane permeability
Drained & Ventilated Cavities to Zones 6 -8
Energy Efficiency
Building Class 2 & 4 DTS solution for Centralised Hot Water^[1]
Thermal
Updated Thermal requirements

HP 10.8.3 & 4 Roof Ventilation

NCC 2025 V1

NCC 2025 HP, 10.8.3 (1)

NCC 2025 HP, 10.8.4

NCC 2025 Vol 1, F8D5 (1)

NCC 2025 Vol 1, F8D6

Class 1 buildings in Climate Zones 4 & 5 now required to be ventilated^{NCC 2025 HP, 10.8.3 (1)NCC 2025 HP, 10.8.4}
Changes to free area requirements
Additional requirements for Roof Spaces with Ceilings that are Parallel to Roof Plane^{NCC 2025 Vol 1, F8D5 (1)NCC 2025 Vol 1, F8D6}

HP 13.2.3 & 13.2.5 - Thermal Breaks

NCC 2025 V1

NCC 2025 HP, 13.2.5 (6)

NCC 2025 HP, 13.2.5 (5)

Thermal break required for any Cladding directly fixed to metal Studs & Battens^{NCC 2025 HP, 13.2.5 (6)}
Insulated Sandwich Panels now require Thermal Bridging to be addressed by calculating its Total R-value^{NCC 2025 HP, 13.2.5 (5)}

J4 Building Fabric

NCC 2025 V1

NCC 2025 Vol 1, J4D4 (1)

NCC 2025 Vol 1, J4D4 (2)

NCC 2025 Vol 1, J4D4 (3)

NCC 2025 Vol 1, J4D3 (1)

J4D3 Thermal Construction
Insulation must be continuous below Parapets, Box Gutters etc^{NCC 2025 Vol 1, J4D4 (1)}
J4D4 Roof & Ceilings
Increased R values for Class 3, 9c & 9a (Ward Areas)^{NCC 2025 Vol 1, J4D4 (2)}
New Solar Reflectance & Thermal Emittance requirements, &^{NCC 2025 Vol 1, J4D4 (3)}
Increased if Air Conditioning equipment is installed on the Roof^{NCC 2025 Vol 1, J4D3 (1)}

HP 10.8.1 External Walls

NCC 2025 V1

NCC 2025 HP, 10.8.1 (2)

AS 4200.1:2017, 5.3.4

NCC 2025 Vol 1, F8D3

Climate Zones 1 - 5^{NCC 2025 HP, 10.8.1 (2)NCC 2025 HP, 10.8.1 (2)}
Vapour / water barrier must achieve a certain permeance range dependent on specific Climate Zone & Wall construction type
Climate Zones 6 - 8^{AS 4200.1:2017, 5.3.4NCC 2025 Vol 1, F8D3}
Walls will require a drained & ventilated Cavity
Class 4 equivalent vapour permeance
Vapour Control Class defined in AS 4200.1^{NCC 2025 Vol 1, F8D3}

NCC 2025 Vol 1, J3D14 (4)

Condensation
Climate zone-specific revisions to Membrane permeability
Drained & Ventilated Cavities to Zones 6 -8
Energy Efficiency
Building Class 2 & 4 DTS solution for Centralised Hot Water^{NCC 2025 Vol 1, J3D14 (4)}
Thermal
Updated Thermal requirements

Informative

Informative Note^Informative

This Tool is a summary of the NCC 2025 Public Comment Draft, as such
Tools™ has focused on DTS updates
Performance Requirements & Verification Methods are not included

Access

Referenced Document Updated to AS 1428.1:2021

Referenced Document Updated to AS 1428.1:2021

Services

Electrical switchboard & EV provision - Class 1
Additional capacity
Energy
Encourages conversion from Gas to Electric
Mandatory on-site energy generation
Cost-effective DTS updates
Additional Facilities for Women
Plumbing
Updates to Cross-connection Control Provisions^[1]
Updates to Rainwater Storage & Contamination Control^[2][3][4][5]

J9D4 & J9D5 Energy Efficiency Class 2 - 9

NCC 2025 V1

EV charging
Updated power wiring, distribution & capacity to serve a percentage of spaces
Solar PV & Batteries
100% PV coverage of practical Roof Area
Minimum PV output (W / m²) for conditioned spaces

HP 13.7.10 & 11 - Electrical Supply

NCC 2025 V1

NCC 2025 HP, 13.7.10

NCC 2025 HP, 13.7.11

≥ 8 empty single phase Circuit Breaker Slots provided if Gas is used for any services^{NCC 2025 HP, 13.7.10}
≥ 4 if Electric Space Heating, Hot Water or Cooker uses 1 or more of the above minimum
≥ 32 A supply from Main Switchboard if in a secondary Switchboard
≥ 1 off 32 A single phase circuit to 1 car space^{NCC 2025 HP, 13.7.11}
≥ 6mm² cross sectional area Active Conductor
≥ 15 A socket or EV Charger installed

F4D4 Bathroom Facilities

NCC 2025 V1

NCC 2025 Vol 1, F4D4 (6)

NCC 2025 Vol 1, F4D4

Sanitary dispensers must be provided for use by females^{NCC 2025 Vol 1, F4D4 (6)}
≥ 1 per Bathroom
Class 9b - Single Auditoriums & Theatres^{NCC 2025 Vol 1, F4D4}
Increased closet pan allocation

NCC 2025 Vol 1, B5D7

NCC 2025 Vol 3, B7D4

NCC 2025 Vol 3, B7D5

NCC 2025 Vol 3, B7D6

NCC 2025 Vol 3, B7D7

Electrical switchboard & EV provision - Class 1
Additional capacity
Energy
Encourages conversion from Gas to Electric
Mandatory on-site energy generation
Cost-effective DTS updates
Additional Facilities for Women
Plumbing
Updates to Cross-connection Control Provisions^{NCC 2025 Vol 1, B5D7}
Updates to Rainwater Storage & Contamination Control^{NCC 2025 Vol 3, B7D4NCC 2025 Vol 3, B7D5NCC 2025 Vol 3, B7D6NCC 2025 Vol 3, B7D7}