NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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J1
NSW Part J1 Energy efficiency performance requirements
NSW Part J1 Energy efficiency performance requirements
Introduction to this Part
This NSW Part J1 replaces Part J1.
This Part sets the thermal performance properties of building fabric, the energy efficiency of key energy using equipment and the features a building must have to facilitate the future installation of distributed energy resources.
Notes
For a Class 2 building or a Class 4 part of a building, where a relevant development consent or an application for a complying development certificate requires compliance with a BASIX Single Dwelling or Multi Dwelling Certificate issued under Version 3.0 or earlier, NSW Section J of NCC 2019 Volume One Amendment 1 applies.
For a Class 2 building or a Class 4 part of a building, where a relevant development consent or an application for a complying development certificate requires compliance with a BASIX Single Dwelling or Multi Dwelling Certificate issued under Version 4.0 or later, Section J of NCC 2022 Volume One applies.
For a Class 2 building or a Class 4 part of a building, where a relevant development consent or an application for a complying development certificate requires compliance with a BASIX Alterations and Additions Certificate, NSW Section J of NCC 2019 Volume One Amendment 1 applies.
For a Class 3 building or Class 5 to 9 building:
From 1 May 2023 to 30 September 2023 NSW Section J of NCC 2019 Volume One Amendment 1 may apply instead of Section J of NCC 2022 Volume One.
From 1 October 2023 Section J of NCC 2022 Volume One applies.
Notes
In NSW, Class 2 buildings and Class 4 parts of buildings are subject to BASIX (the Building Sustainability Index), however Class 3 buildings are not.
BASIX is the web-based planning tool designed to assess the potential performance of certain residential buildings against a range of sustainability indices including thermal comfort and energy. Commitments made under BASIX become a condition of the relevant development consent or complying development certificate.
BASIX applies in NSW to all new Class 2 buildings and Class 4 parts of buildings; and to alterations and additions to buildings of those classes where the work is subject to BASIX and also where an applicant elects to comply with BASIX.
The provisions of Section J are therefore designed to complement requirements that arise under BASIX and which are implemented via the development consent.
Where BASIX is not applied to alterations and additions to these buildings, the provisions will also complement council development controls that require energy efficiency measures to be incorporated as part of the alterations and additions.
NSW J1O1 Objective2019: JO1
The Objective of this Section is to—
reduce energy consumption and energy peak demand; and
reduce the energy consumption and energy peak demand of key energy using equipment; and
reduce the greenhouse gas emissions that occur as a result of a building’s energy consumption and energy source; and
for a sole-occupancy unit of a Class 2 building or a Class 4 part of a building, improve occupant health and amenity by mitigating the impact of extreme hot and cold weather events and energy blackouts; and
for other than in a sole-occupancy unit of a Class 2 building or a Class 4 part of a building, protect occupant health and amenity by ensuring the building envelope assists in the maintenance of acceptable internal conditions while the building is occupied; and
be able to accommodate the future installation of distributed energy resources.
NSW J1P4 Renewable energy and electric vehicle chargingNew for 2022
A building must have features that facilitate the future installation of on-site renewable energy generation and storage and electric vehicle charging equipment.
NSW J1P5 Building fabric—Class 2 building and Class 4 parts of a building2019: NSW J(A)P1
(1) Thermal insulation in a building must be installed in a manner and have characteristics, which facilitate the efficient use of energy for artificial heating and cooling.
(2) A building must have, to the degree necessary, thermal breaks installed between the framing and external cladding, to facilitate efficient thermal performance of the building envelope.
Explanatory information
NSW J1P5 only applies to a Class 2 building or a Class 4 part of a building.
NSW J1P5(1) only applies to thermal insulation in a building where a development consent specifies that the insulation is to be provided as part of the development.
NSW J1P5(2) only applies to a metal framed roof and metal framed wall.
NSW J1P6 Building sealing—Class 2 building and Class 4 parts of a building2019: NSW J(A) P2
A building must have, to the degree necessary, a level of building sealing against air leakage to facilitate the efficient use of energy for artificial heating and cooling appropriate to—
the function and use of the building; and
the internal environment; and
the geographic location of the building.
Applications
NSW J1P6 only applies to a Class 2 building or Class 4 part of a building, except—
the building complies with the additional requirements in Specification 33.
(2) For a Class 3 building, compliance with NSW J1P1 is verified when—
a minimum 4-star NABERS Energy for Hotels Commitment Agreement is obtained; and
the operating hours of the services are not less than 12 hours per day in bedrooms, dining rooms and conference facilities, 24 hours per day in corridors and foyers and 18 hours per day in back-of-house areas; and
the energy model required for (a) demonstrates that—
the greenhouse gas emissions of the services are less than 70% of the 5-star level; and
the space temperature in any indoor swimming pool chamber is maintained at 2°C above the pool temperature during occupied hours of not less than 12 hours per day; and
the building complies with the additional requirements in Specification 33.
(3) For a Class 6 shopping centre, compliance with NSW J1P1 is verified when—
a minimum 4.5-stars NABERS Energy for Shopping Centres Commitment Agreement is obtained; and
the building has:
an air-conditioned common area of not less than 20% of the gross lettable area; and
the greenhouse gas emissions of the services covered within the scope of NABERS Energy for Shopping Centres ratings are less than 80% of the 4.5-star level; and
NSW J1V4 Verification of building envelope sealing2019: JV4
(1) Compliance with NSW J1P1(e) and NSW J1P6 is verified for building envelope sealing when the envelope is sealed at an air permeability rate, tested in accordance with Method 1 of AS/NZS ISO 9972, of not more than—
for a Class 2 building or a Class 4 part of a building, 10 m³/hr.m² at 50 Pa reference pressure; or
for a Class 5, 6, 8 or 9a or 9b building, other than a ward area, in climate zones 1, 7 and 8, 5 m³/hr.m² at 50 Pa reference pressure; or
for a Class 3 or 9c building, or a Class 9a ward area in climate zones 1, 3, 4, 6, 7 and 8, 5 m³/hr.m² at 50 Pa reference pressure.
(2) In a sole-occupancy unit of a Class 2 building or a Class 4 part of a building, where an air permeability rate of not more than 5 m3/hr.m2 at 50 Pa reference pressure is achieved—
a mechanical ventilation system must be provided that—
can be manually overridden; and
provides outdoor air, either—
continuously; or
intermittently, where the system has controls that enable operation for not less than 25 per cent of each 4 hour segment; and
provides a flow rate not less than that achieved with the following formula:Q=(0.05×A+3.5×(N+1))/p, where—
Q= the required air flow rate (L/s); and
A= the total area of the sole-occupancy unit of a Class 2 or Class 4 part of a building (m2); and
N= the number of bedrooms in the sole-occupancy unit of a Class 2 or Class 4 part of a building; and
p= the fraction of time within each 4 hour segment that the system is operational; and
any space with a solid-fuel burning combustion appliance must be ventilated with permanent openings directly to outside with a free area of not less than half of the cross-sectional area of the appliance’s flue; and
any space with a gas-fueled combustion appliance must be ventilated in accordance with—
clause 6.4 of AS/NZS 5601.1; and
clause 6.4.5 of AS/NZS 5601.1.
(3) For the purposes of (2)(c), the volume of the space is considered to be 1 m3 for determining ventilation requirements.