Pest Inspection Before Buying a House and What It Covers

The house looks solid, the building report came back mostly clean, and the agent says nobody bothers with a separate pest check anymore. Then six months after settlement you push a screwdriver into a skirting board and it goes straight through. A pest inspection before buying is how you find termite damage while it is still the seller's problem and a negotiating point, not your repair bill.

This guide covers what a timber pest inspection actually checks, what it costs, how to read the report, and what to do when it finds something.

What a pest inspection before buying actually covers

In Australia, a pre-purchase timber pest inspection is carried out to the standard AS 4349.3. Despite the name, it is not about mice or cockroaches. It looks for anything that damages the timber in a house:

• Subterranean termites, the big one. They cause more damage to Australian homes than fire, flood and storms combined, and most home insurance policies exclude them.
• Borers, small beetles whose larvae tunnel through floorboards and framing.
• Wood decay fungi, the rot that sets in where timber stays damp.
• Conducive conditions, meaning anything that makes an attack more likely, such as leaking taps, garden beds piled against the walls, or poor subfloor ventilation.

The inspector checks the interior, the roof void, the subfloor, the exterior walls and the grounds up to 50 metres from the house, including fences, sheds and tree stumps. A good one taps skirting boards and door frames, uses a moisture meter, and often a thermal camera.

What it costs and how long it takes

A standalone timber pest inspection on a typical three bedroom house costs about 250 to 400 dollars in most capital cities. Bundled with a building inspection, the pair usually runs 450 to 750 dollars, which is cheaper than booking them separately.

Expect the inspector to spend 60 to 90 minutes on site, longer for an older home with a full subfloor. The written report normally arrives within 24 hours, often the same evening. Some inspectors add a thermal imaging or radar scan for 80 to 150 dollars extra. On a timber house in a known termite area, that add-on is worth paying for.

It sits in the same small group of costs as conveyancing and the building report. If you are still budgeting, our list of upfront costs of buying a home puts all of them in one place.

When to book the inspection

Timing depends on how you are buying.

1. Private sale with a cooling off period. Sign subject to a satisfactory building and pest inspection, then book it for the first or second day. In New South Wales the standard cooling off period is five business days, and inspectors book up fast. See our guide to the cooling off period when buying a home for how the clock works in each state.
2. Private sale with a finance and inspection clause. Your solicitor or conveyancer can write the inspection condition into the contract, usually with 7 to 14 days to complete it.
3. Auction. There is no cooling off, so the inspection must happen before auction day. Book it at least a week out and accept that you might pay for reports on houses you do not win.

Whatever the method, ask for access to the subfloor and roof void when you book. An inspector who cannot get into those spaces will write "no access" against them, and that is exactly where termites live.

How to read the report without panicking

Pest reports are written defensively and almost every one contains warnings. The trick is separating live problems from routine caveats.

Read these sections first:

• Active termites found. Live termites seen during the inspection. This is serious and needs treatment before or soon after settlement.
• Evidence of past termite activity or damage. Old mud leads or damaged timber with no live insects. Ask whether a treatment certificate exists and how old it is.
• Overall risk rating. Usually low, moderate or high. Moderate is very common in older suburbs and is not on its own a reason to walk away.
• Areas not inspected. Anything blocked by furniture, stored boxes or locked rooms. If the list is long, ask the agent for a second visit.

Then call the inspector. A ten minute phone call is included in the fee, and asking "would you buy this house?" often gets a more honest answer than any written paragraph.

The common advice I disagree with: newer homes do not need one

Buyers of houses built in the last ten years are often told a pest inspection is a waste of money because the home has a termite barrier and a builder's warranty.

I would book one anyway. Physical and chemical barriers installed during construction only work if nobody breaks them. A new owner adds a garden bed above the slab edge, builds a timber deck against the wall, or a plumber cuts through the barrier, and termites have a direct path inside. Many chemical barriers also need retreatment after five to eight years, and few owners keep up with it.

Builder's warranties rarely cover termite damage either, because it is usually treated as a maintenance failure. For 300 dollars, confirming the barrier is intact and the conditions around it are sound is cheap peace of mind on a house you are paying 800,000 dollars for.

What to do if the inspection finds termites

Finding termites does not automatically mean walking away. It means getting numbers.

1. Get a treatment quote. A full chemical barrier treatment for an average house costs about 2,500 to 4,500 dollars. A baiting system costs similar up front plus yearly monitoring.
2. Get a repair estimate. If timber is damaged, a builder needs to look at it. Damage to skirting and architraves is cheap. Damage to bearers, joists or roof framing can run into tens of thousands.
3. Negotiate. Ask for a price reduction equal to treatment plus repairs, or for the seller to treat before settlement with a certificate and warranty.
4. Walk away if structure is affected and the numbers do not work. That is exactly what the inspection condition is for.

Pair the pest findings with your building report, since the two often point at the same cause, such as a leaking shower or poor drainage. Our guide to the building inspection items that actually matter helps you rank everything in one list.

Frequently asked questions

Is a pest inspection necessary when buying a house?

It is not legally required, but it is strongly recommended, especially for houses with timber framing or floors. Termite damage is rarely covered by home insurance, so the buyer carries the full cost after settlement. A 250 to 400 dollar inspection is small next to a repair bill.

Can you do a pest inspection after buying a house?

Yes, but at that point any damage found is your expense. An inspection after settlement is still useful as a baseline, and many experts suggest repeating it every 12 months in high risk areas. Before exchange is when it gives you the most leverage.

What is the difference between a building and pest inspection?

A building inspection checks the structure and condition of the home, such as cracking, roofing, moisture and safety issues. A pest inspection focuses on timber pests like termites, borers and rot. They are often done together by one firm because the problems overlap.