Termite Management Requirements for New Homes

In Australia, termites are a serious threat to timber-framed homes. The Building Code of Australia requires all new homes to have a termite management system that complies with AS 3660.1. This standard specifies the requirements for physical and chemical barriers that prevent termites from accessing the structural elements of the building.

Every builder must include a termite management system in the build — the question is what type of system is included as standard, and what the upgrade options cost. Understanding the options can help you decide whether the standard barrier is sufficient or whether an upgrade is worth the cost.

The Two Main Types of Termite Barriers

There are two main categories of termite management systems used in new Australian homes: physical barriers and chemical barriers. Most builders include a physical barrier as standard; chemical barriers are often offered as an upgrade.

Physical Barriers Explained

Physical barriers are permanent systems installed during construction that create a physical barrier termites cannot pass through. They do not rely on chemicals and do not require replenishment.

The most common physical barriers are:

• **Stainless steel mesh** — A fine mesh (typically 0.45mm aperture) installed across the slab edge, in pipe penetrations, and in any joints where termites could enter. The mesh is too fine for termites to pass through and too tough for them to chew through. Brands like Termimesh are the industry standard.
• **Granite aggregate** — A layer of graded granite aggregate (particles 1.7–2.4mm) installed around pipe penetrations and in the cavity. The particles are too heavy for termites to move and the gaps between them are too small for termites to pass through.
• **Slab exposure** — The concrete slab itself acts as a barrier. Termites cannot eat through concrete, but they can enter through cracks, joints and pipe penetrations. For this to work, the slab edge must be exposed (visible) so that termite mud tubes can be detected during inspections.

Physical barriers are the most common standard inclusion because they are permanent, require no maintenance (other than annual inspections), and comply with AS 3660.1.

Chemical Barriers Explained

Chemical barriers involve treating the soil under and around the slab with a termiticide — a chemical that either repels termites or kills them on contact. Chemical barriers are effective but have a limited lifespan and require periodic retreatment.

The two main types of chemical barriers are:

• **Soil treatment** — The soil under the slab and around the perimeter is treated with a liquid termiticide before the slab is poured and after the slab is completed. The chemical typically lasts 5–10 years, after which the soil needs to be re-treated. Re-treatment involves drilling holes through the slab or trenching around the perimeter and injecting new chemical.
• **Reticulation system** — A network of perforated pipes is installed under the slab before the pour. When the chemical needs replenishing, the pest controller connects to the pipe system and pumps new chemical through it, distributing it under the slab without drilling. The pipe system lasts for the life of the building; the chemical still needs replenishing every 5–10 years.

What Builders Typically Include

Most volume builders in Australia include a physical barrier (usually stainless steel mesh or granite) as standard in their base price. This complies with AS 3660.1 and the Building Code of Australia.

Chemical barriers (soil treatment or reticulation) are typically offered as an upgrade. Some builders include a basic chemical treatment in addition to the physical barrier; others offer it as a paid upgrade.

Annual Inspections: The Ongoing Requirement

Regardless of which termite barrier you choose, AS 3660.1 requires annual termite inspections by a licensed pest controller. The barrier is designed to force termites to show themselves (by building mud tubes around the barrier) rather than to prevent them entirely. Annual inspections detect these tubes before termites can breach the barrier and cause damage.

Annual inspections typically cost $250–$400. Some builders include the first year's inspection; after that, you are responsible for arranging and paying for annual inspections.

Termite Warranties

Most termite management systems come with a warranty, but the terms vary significantly:

The Termimesh 50-year warranty is one of the strongest in the industry, but it requires annual inspections by an approved inspector and is void if the barrier is damaged by subsequent building works (e.g. adding a deck, pergola or extension without re-installing the barrier).

What to Check Before Signing

Common Mistakes and Hidden Costs

• Assuming the termite barrier is a complete protection — it is not. Annual inspections are required to maintain the warranty and detect termite activity.
• Not budgeting for annual inspections ($250–$400 per year) after the first year.
• Paying for a chemical barrier upgrade when the standard physical barrier is sufficient — physical barriers are permanent and require no replenishment.
• Not checking the warranty conditions — most warranties are void if annual inspections are not maintained or if the barrier is damaged by subsequent works.
• Forgetting that adding a deck, pergola or extension can breach the termite barrier — the barrier needs to be re-installed around the new structure.
• Assuming the builder's structural warranty covers termite damage — in most states, structural warranties cover defects in workmanship and materials, not termite damage (unless the barrier failed).

Frequently Asked Questions