AustraliaAustralia

National Construction Code (NCC) Residential Buildings

The NCC is a national uniform Code that contains the minimum performance requirements for building and plumbing construction in Australia

Applicable Building Type(s)

New residential

Policy Requirement Level

Mandatory

Policy Sequence

Governance

Development Authority: Australian Building Codes Board

Implementation Authority: State and Territory Governments (and local governments)

Verification Authority: Registered Building Certifiers (private and public)

Enforcement Authority: State and Territory Governments (and local governments)

Prescriptive Compliance path

NCC Volume Two (Section 3.12) – Housing also NCC Volume Three (Part B2.4 Hot Water Services)

 

Explanatory information:

There are two options for complying with the energy efficiency Deemed-to-Satisfy Provisions

3.12.1 to 3.12.4:

 

Option 1 Energy Rating — 3.12.0(a)(i) to achieve the required energy rating and comply with

(B) to (F) for energy-saving features such as the testing and installation of insulation, thermal breaks, compensation for downlights, floor edge insulation and detailed provisions for building sealing.

 

Option 2 Elemental Provisions — 3.12.0(a)(ii) to satisfy all the detailed provisions including meeting the Total R-Values of roofs, walls and floors, the glazing allowances and the air movement requirements. These detailed provisions also include the testing and installation of insulation, thermal breaks, compensation for downlights, floor edge insulation and detailed provisions for building sealing.

Energy Requirements:

Insulation

Table 3.12.1.1a ROOF AND CEILING—MINIMUM TOTAL R-VALUE

Climate zone

          1         

2

          3          

     4           and           5    

    6  and   7  

8

Altitude less than 300 m

Altitude 300 m or more

Direction of heat flow

Downwards

Downwards and upwards

Upwards

Minimum Total R-Value for a roof with an upper surface solar absorptance value of not more than 0.4

3.1

4.1

4.1

4.1

4.6

6.3

Minimum Total R-Value for a roof with an upper surface solar absorptance value of more than 0.4 but not more than 0.6

4.1

4.6

4.6

4.6

5.1

6.3

Minimum Total R-Value for a roof or ceiling with a roof upper surface solar absorptance value of more than 0.6

5.1

5.1

5.1

5.1

5.1

6.3

Note: Altitude means the height above the Australian Height Datum at the location where the building is to be constructed.

Windows

The ABCB has produced a glazing calculator which is used to determine glazing compliance, refer link below

http://abcb.gov.au/work-program/energy-efficiency/glazing-calculator.aspx

The Deemed to satisfy also provides the following

WORST CASE WHOLE GLAZING ELEMENT PERFORMANCE VALUES

Glass description

Aluminium framing

Timber or uPVC framing

Total System U-Value

Total System SHGC

Total System U-Value

Total System SHGC

Single clear

7.9

0.81

5.6

0.77

Tinted single

7.9

0.65

5.6

0.61

Clear double (3/6/3)

6.2

0.72

3.8

0.68

 

Doors

Doors must be sealed.

Skylights

Skylights are considered as part of the glazing requirements shown in the windows section. 

Space Heating System

3.12.5.4 Electric resistance space heating

An electric resistance space heating system that serves more than one room must have—

(a) separate isolating switches for each room; and

(b) a separate temperature controller and time switch for each group of rooms with common heating needs; and

(c) power loads of not more than 110 W/m2 for living areas, and 150 W/m2 for bathrooms.

Water Heating System

B2.4 Water heater in a heated water supply system

In a new Class 1 or Class 10 building—

 (a) a water heater in a heated water supply system must be—

(i)         a solar heater complying with (b); or

(ii)         a heat pump heater complying with (b); or

(iii)        a gas water heater complying with (c); or

(iv)        an electric resistance water heater only in the circumstances described in (d); or

(v)        a wood fired thermosiphon water heater or direct fired water heater each complying with AS/NZS 3500.4; 

Lighting

(a) The lamp power density or illumination power density of artificial lighting, excluding heaters that emit light, must not exceed the allowance of—

(i)         5 W/m2 in a Class 1 building; and

(ii)         4 W/m2 on a verandah, balcony or the like attached to a Class 1 building; and

(iii)        3 W/m2 in a Class 10a building associated with a Class 1 building.

(b) The illumination power density allowance in (a) may be increased by dividing it by the illumination power density adjustment factor for a control device in Table 3.12.5.3 as applicable.

(c) When designing the lamp power density or illumination power density, the power of the proposed installation must be used rather than nominal allowances for exposed batten holders or luminaires.

Performance Compliance path

NCC Volume Two (Part 2.6) – Housing

Energy Requirements:

Insulation

V2.6.2.2 Verification using a reference building

(a) Compliance with P2.6.1 is verified when a proposed building, compared with a reference building, has—

(i) in climate zones 1 and 2, a cooling load equal to or less than that of the reference building; or

(ii) in climate zones 7 and 8, a heating load equal to or less than that of the reference building; or

(iii) in climate zones 3, 4, 5 and6, a heating load and a cooling load equal to or less than that of the reference building

Compliance Softwares:

Nationwide House Energy Rating Scheme (NatHERS) was initiated to provide a standardised approach to rating the thermal performance of dwellings throughout Australia. NatHERS accredited software estimates the annual heating and cooling energy load on a dwelling required to keep it at a comfortable temperature for its occupants. It does this by modelling the effects of heat flow through the building fabric, taking into account factors such as the building’s location, orientation, glazing, construction details and the impact of air movement on internal comfort conditions. The software attributes a star rating between zero and 10 to the dwelling based on the estimated total annual energy load and the climate zone where the house is located.

NatHERS accredited software may be used to comply with certain building regulations including the thermal performance requirements for residential buildings in the National Construction Code (NCC).  Software currently accredited under the scheme includes BERSpro, FirstRate 5 and Accurate.

End-uses considered:

Lighting interior, Space cooling, Space heating, Ventilation, Water heating

Resources

Notes

Climate zones