Road Traffic Noise and Noise Corridors for New Homes
Cost estimates only: Any building or upgrade figures in this guide are indicative, not fixed prices or quotes. Costs and inclusions vary by project, supplier, location and time. Confirm current written prices and specifications directly with your builder, suppliers and relevant trades.
Table of Contents
Road traffic noise is the most common noise issue for new home builds in Australia. As cities expand and more homes are built near major roads, highways, and freeways, councils and state governments are increasingly requiring acoustic treatment to ensure the internal noise level in new homes is at a comfortable level for sleeping and living.
If your block is near a major road, the acoustic treatment can add $5,000–$25,000 or more to the build cost. Understanding the noise level at your block, the likely treatment requirements, and how the builder handles the cost is essential before you sign.
What Is a Noise Corridor?
A noise corridor is an area along a major road, highway, or freeway where the external noise level exceeds the threshold set by the state's road noise policy. The corridor is typically shown on the council's planning scheme maps as a 'Transport Noise Overlay' or 'Road Noise Corridor'.
The width of the noise corridor depends on the road type, the traffic volume, the speed limit, and the presence of noise barriers (e.g. sound walls, earth mounds). A freeway may have a noise corridor extending 100–300 metres from the road, while a major arterial road may have a corridor of 50–100 metres.
State Road Noise Policies
Each state has a road noise policy that sets the noise level thresholds and the requirements for new homes in noise corridors. The policies are broadly similar but have some variations:
| State | Policy / Code | Daytime Threshold | Nighttime Threshold |
|---|---|---|---|
| QLD | State Planning Policy — Transport Noise | 60 dB(A) | 55 dB(A) |
| NSW | Development Near Rail Corridors and Busy Roads | 60 dB(A) | 55 dB(A) |
| VIC | State Environment Protection Policy (SEPP) N-1 | 60 dB(A) | 55 dB(A) |
| SA | Transport Noise Framework | 60 dB(A) | 55 dB(A) |
| WA | State Planning Policy 5.4 — Road and Rail Transport Noise | 60 dB(A) (LAden) | 55 dB(A) (Lnight) |
| TAS | State Planning Provisions — Noise-Sensitive Use | 60 dB(A) | 55 dB(A) |
If the external noise level at the facade of the proposed home exceeds the threshold, an acoustic report is required, and the construction must achieve the specified internal noise level.
How Road Traffic Noise Is Measured
Road traffic noise is measured in dB(A) — a decibel scale that approximates the response of the human ear. The noise level is typically measured or modelled at the facade of the proposed building, 1.2–1.5 metres above ground level (the height of a window).
For planning purposes, the noise level is usually expressed as:
- **LAeq** — the equivalent continuous noise level (the average noise level over a period, typically 1 hour for daytime or 15 minutes for nighttime)
- **LA10** — the noise level exceeded for 10% of the measurement period (used in some states for peak traffic noise)
- **LAmax** — the maximum noise level during the measurement period (used for nighttime sleep disturbance assessment)
A noise level of 60 dB(A) is roughly equivalent to the noise of normal conversation. 70 dB(A) is similar to a vacuum cleaner at 1 metre. 80 dB(A) is similar to a busy kitchen.
Acoustic Treatment Options
If the external noise level exceeds the threshold, the acoustic report will recommend one or more of the following treatment options:
| Treatment | How It Reduces Noise | Typical Cost | Effectiveness |
|---|---|---|---|
| Acoustic glazing (laminated) | The laminated interlayer dampens noise transmission through the glass | $50 – $150/m² of glazing | High — reduces noise by 5–10 dB |
| Upgraded wall insulation | Insulation in the wall cavity absorbs noise transmitted through the wall | $30 – $80/m² of wall | Moderate — reduces noise by 3–6 dB |
| Sealed openings | Acoustic seals on doors and windows prevent noise leaking through gaps | $500 – $2,000 per home | High — reduces noise by 5–10 dB |
| Mechanical ventilation | Allows windows to remain closed (closed windows block more noise) | $5,000 – $15,000 | High — allows full window closure |
| Solid core doors | Heavier doors block more noise than hollow core doors | $300 – $800 per door | Moderate — reduces noise by 3–5 dB |
| Acoustic barrier wall (fence) | A solid wall between the road and the home blocks line-of-sight noise | $3,000 – $15,000 | High — reduces noise by 5–15 dB (if tall enough) |
| Earth mound (berm) | An earth mound between the road and the home blocks and absorbs noise | $10,000 – $30,000 | High — reduces noise by 10–20 dB |
Important
An acoustic barrier wall is only effective if it blocks the line of sight from the noise source to the window. If the wall is too low, noise will diffract over the top. For road traffic noise, the wall typically needs to be at least 1.8–2.0 metres high to be effective.
The Impact on Design
Acoustic treatment can affect the design of your home in several ways:
- **Window size and placement** — The acoustic report may limit the size of windows facing the road, or require windows to be on the opposite side of the house.
- **Window operability** — If mechanical ventilation is required, windows may need to remain closed (i.e. fixed or awning windows rather than sliding windows).
- **Outdoor living areas** — The alfresco, patio, or garden may need to be positioned on the side of the house away from the road.
- **Building setback** — The building may need to be set back further from the road to increase the distance and reduce the noise level.
- **Room layout** — Bedrooms (which have a lower nighttime noise target) may need to be positioned on the side of the house away from the road.
How Builders Handle Road Noise Costs in Contracts
Builders handle road noise costs in one of three ways:
- **Included in the fixed price** — The builder has obtained a preliminary acoustic assessment and included the acoustic treatment in the fixed price. This is the best outcome but is uncommon for blocks where the noise level has not been confirmed.
- **Provisional sum** — The builder includes an estimate for acoustic treatment but notes that the actual cost may vary based on the final acoustic report.
- **Exclusion** — The builder explicitly excludes all acoustic-related costs from the contract. You must obtain the acoustic report and pay for the treatment as a variation.
Tip
What to Check Before Buying Land
- Is the block in a noise corridor or transport noise overlay? Check the council's planning scheme maps.
- What is the road type, traffic volume, and speed limit? (This gives an indication of the likely noise level.)
- What is the distance from the block to the road? (Greater distance = lower noise level.)
- Is there an existing noise barrier (sound wall, earth mound) between the road and the block?
- Has a preliminary acoustic assessment been conducted? If not, consider commissioning one before buying.
- Has the builder included acoustic costs in the contract, or are they a provisional sum / exclusion?
- Will the acoustic requirements limit the design (e.g. window size, placement, or operability)?
- Is mechanical ventilation required? If so, what is the cost?
Common Mistakes and Hidden Costs
- Not checking whether the block is in a noise corridor before buying.
- Assuming the builder's base price includes acoustic treatment — many builders exclude this.
- Forgetting that mechanical ventilation may be required if windows need to remain closed.
- Not budgeting for the cost of the acoustic report ($1,500–$3,500).
- Assuming a standard fence provides noise protection — only a solid, continuous, tall wall (masonry or timber with no gaps) is effective.
- Not checking whether the acoustic requirements limit the design (e.g. bedroom placement, window size).
- Forgetting that noise levels can increase over time as traffic volume grows — a block that is currently below the threshold may exceed it in the future.
Frequently Asked Questions
Practical Takeaway
Road traffic noise is the most common noise issue for new home builds in Australia. If your block is near a major road, highway, or freeway, the acoustic treatment can add $5,000–$25,000 or more to the build cost. The key is to check whether the block is in a noise corridor, commission a preliminary acoustic assessment if it is, and confirm how the builder handles acoustic costs before signing the building contract.
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