New Zealand Noise Measurement Standards: NZS 6801/6802 & Building Code G6

TL;DR

New Zealand regulates noise through NZS 6801:2008 (Acoustics — Measurement of environmental sound) and NZS 6802:2008 (Acoustics — Environmental noise) together with the Building Code Clause G6 (Airborne and Impact Sound). The Resource Management Act 1991 (RMA) provides the legal framework for environmental noise control through district plans. NZS 6802 recommends upper noise limits of 55 dBA LAeq daytime and 45 dBA LAeq nighttime, with lower limits of 40 dBA daytime and 30 dBA nighttime for quiet residential areas. Building Code G6 requires minimum sound insulation between household units: DnT,w + Ctr >= 55 for walls and floors. New Zealand also has specific standards for wind farm noise (NZS 6808), construction noise (NZS 6803), and airport noise (NZS 6805). SonaVyx supports NZ compliance with IEC 61672-1 measurement, building acoustic assessment tools, and environmental noise monitoring for RMA consent conditions.

New Zealand Noise Regulatory Framework

New Zealand uses a combination of NZS standards and the Resource Management Act to regulate noise. The RMA gives district and regional councils the authority to set noise limits through their district plans, while NZS standards provide the measurement methodology and recommended limits that most plans reference.

NZS 6801:2008 — Measurement of Environmental Sound

NZS 6801 specifies procedures for measuring environmental sound for assessment under NZS 6802:

Measurement positions: free-field (preferred) or facade (with -2.5 dB correction)
Duration: minimum 15 minutes for steady sources, representative period for variable sources
Wind: measurements invalid when wind exceeds 5 m/s at microphone height
Equipment: IEC 61672-1 Class 1 for compliance, Class 2 for screening
Statistical levels: L10, L50, L90, LAeq, and LAFmax required

The SonaVyx SPL meter provides all statistical levels required by NZS 6801.

NZS 6802:2008 — Environmental Noise

NZS 6802 provides recommended noise limits for assessment under the RMA:

Upper noise limits: 55 dBA LAeq (day 07:00-22:00), 45 dBA LAeq (night), 75 dBA LAFmax (night)
Lower noise limits: 40 dBA LAeq (day), 30 dBA LAeq (night), 60 dBA LAFmax (night)
Assessment: compare measured specific sound level against the noise limits and ambient sound level
Adjustments for special character: +5 dB for tonal, +5 dB for impulsive, -5 dB for intermittent

Use the noise monitor for extended environmental surveys per NZS 6802 methodology.

Building Code Clause G6 — Airborne and Impact Sound

Clause G6 mandates acoustic insulation between household units in attached dwellings:

Walls between units: DnT,w + Ctr >= 55
Floors between units: DnT,w + Ctr >= 55, L'nT,w <= 59 (impact)
Acceptable Solution G6/AS1 provides deemed-to-satisfy construction details
Verification Method G6/VM1 specifies field testing per ISO 16283
This requirement is significantly stricter than many other countries (compare UK at DnT,w + Ctr >= 45)

SonaVyx sound insulation tool calculates DnT,w with spectrum adaptation terms for G6 compliance verification.

Resource Management Act District Plan Noise Rules

Each territorial authority sets noise limits in their district plan under the RMA:

Auckland Unitary Plan: 50-75 dBA LAeq at zone boundary depending on zone and time of day
Wellington District Plan: residential 45 dBA night, 55 dBA day
Christchurch District Plan: updated post-earthquake with modern acoustic requirements
Resource consent conditions may impose stricter limits for specific activities

Measurement Procedures

Follow NZS 6801:2008 for all environmental noise measurements
Position microphone at 1.2-1.5m height, free-field or 1m from facade
Measure LAeq, L10, L50, L90, and LAFmax for each assessment period
For Building Code G6, follow NZS 1270 verification method (aligned with ISO 16283)
Document weather conditions, extraneous noise sources, and measurement uncertainty
For compliance assessment, compare measured levels against relevant district plan rules

Practical Tips for NZ Measurements

NZ Building Code G6 requires DnT,w + Ctr >= 55 — stricter than many countries, so careful attention to construction quality is essential
Wind is a significant factor in NZ — coastal locations may require multiple measurement attempts
Birdsong (particularly tui and bellbird) can affect daytime L90 measurements — exclude if assessing industrial/commercial noise
Post-earthquake rebuild in Christchurch created new acoustic standards for medium-density housing
New Zealand Acoustical Society (NZAS) provides guidance on applying NZS standards

How SonaVyx Meets NZ Requirements

SonaVyx provides the measurement tools for New Zealand acoustic compliance. The SPL meter measures LAeq, L10, L50, L90, and LAFmax per NZS 6801. The noise monitor supports extended surveys for RMA consent compliance. The sound insulation suite calculates DnT,w + Ctr for Building Code G6 verification. The RT60 tool measures reverberation for educational and assembly spaces. For building acoustic design, visit AcousPlan RT60 calculator. Learn more in our learning modules.