Building and Pest Inspection Guide for Property Investors

A building and pest inspection is the single most important piece of due diligence you do before buying an investment property. It costs $400 to $800. Skipping it to save money is one of the worst decisions you can make.

We review B&P reports every week as part of our buying process. Here’s everything you need to know, from what it covers to how to use the findings in your negotiation.

What the Inspection Covers

A building and pest inspection is a visual, non-invasive assessment of a property’s structure and condition, conducted under Australian Standard AS 4349.1. The inspector examines accessible areas only, they’re not pulling up floorboards or cutting into walls.

Building inspection covers:

• Structural integrity: foundations, load-bearing walls, beams, lintels
• Roof condition: tiles, flashing, gutters, downpipes, fascia
• Internal condition: walls, ceilings, doors, windows, wet areas
• External condition: cladding, brickwork, drainage, retaining walls
• Subfloor: stumps, bearers, joists, ventilation, moisture
• Roof space: framing, insulation, sarking, ventilation
• Site drainage and grading around the property

Pest inspection covers:

• Active termite activity (mud tubes, damage to timber, hollow-sounding wood)
• Evidence of past termite damage
• Conducive conditions (moisture, timber-to-ground contact, poor drainage)
• Timber borers, wood decay fungi
• Subfloor and roof space timber condition

The inspector doesn’t test plumbing pressure, electrical wiring, or appliances. Those are separate specialist inspections. For investment properties, the B&P covers the structural and pest risk, which is where the big money issues hide.

How Much Does It Cost?

Building and pest inspection costs vary by property size and location. Combined packages (building + pest together) are always cheaper than booking them separately.

Typical combined B&P costs by city:

Larger properties, older homes, and properties with multiple outbuildings cost more because they take longer to inspect. Budget $500 to $600 as a reasonable middle estimate for a standard 3-bedroom house.

Some inspectors charge extra for thermal imaging, which uses infrared cameras to detect moisture behind walls. It’s worth the extra $100 to $200, especially for properties in high-termite-risk areas like South East Queensland, Northern NSW, and Northern Territory.

For a full breakdown of every cost involved in purchasing an investment property, use our upfront cost calculator.

How to Read the Report

A B&P report is typically 30 to 60 pages long, filled with technical language and photos. Most people skim it. That’s a mistake.

Here’s what to focus on:

1. The summary page. Every report has one. It lists major defects, minor defects, and areas that need monitoring. Read this first, but don’t stop here.

2. Major defects. These are structural problems that affect the safety or liveability of the property, or are likely to require significant expenditure to fix. The report will flag these clearly. Examples: cracked foundations, significant roof damage, active termite damage, major drainage failure.

3. Minor defects. Maintenance items and wear-and-tear. Cracked grout, minor surface cracks, weathered paintwork, worn seals. Every property has minor defects. They’re expected, especially in older investment-grade properties.

4. Safety hazards. Non-compliant balustrades, missing smoke alarms, asbestos-containing materials, electrical hazards. Some of these need rectifying before a tenant moves in.

5. Limitations and inaccessible areas. The inspector will note areas they couldn’t access: locked rooms, furniture blocking walls, insulation covering roof framing. These are potential blind spots. If a critical area wasn’t inspected, ask about it.

6. Photos. Cross-reference the inspector’s comments with the photos. A crack described as “minor” in the text sometimes looks more concerning in the image, and vice versa.

Red Flags vs Minor Issues

Not everything in a B&P report is a deal-breaker. The skill is knowing which findings matter and which don’t.

Red flags (proceed with extreme caution or walk away):

• Active termite damage to structural timbers. This is the big one. Termites cause more damage to Australian homes than fire, floods, and storms combined. Repair costs for severe structural termite damage can exceed $100,000, plus ongoing management costs of $1,500 to $3,000 per year
• Significant foundation movement. Diagonal cracking through brickwork, doors and windows that won’t close properly, uneven floors. Foundation repairs are expensive and can run into tens of thousands
• Major roof structure failure. Sagging ridgelines, broken trusses, widespread water ingress. A full roof replacement on a standard house runs $15,000 to $25,000+
• Significant water damage or rising damp. Ongoing moisture issues cause rot, mould, and attract termites. The source needs to be identified and fixed before the damage spreads
• Asbestos in poor condition. Intact asbestos sheeting (common in pre-1990 homes) is manageable. Damaged, deteriorating, or friable asbestos needs professional removal, which starts at $3,000 to $5,000 and goes up fast depending on extent

Minor issues (normal for investment properties):

• Hairline surface cracks in render or plaster
• Worn or dated bathrooms and kitchens (you might reno these anyway)
• Minor drainage grading issues
• Weathered external paint
• Aged hot water system
• Tree roots near sewer lines (common, monitor it)
• Minor timber decay in fence posts or garden structures

Every property has issues. Older established properties, the kind that make the best investments, will always have more wear than a new build. The question isn’t whether the report finds problems. It’s whether those problems are structural, expensive, or recurring.

How to Negotiate After a Bad Report

A B&P report that identifies significant issues gives you leverage. Here’s how to use it.

Step 1: Get repair quotes. Don’t negotiate based on guesswork. Get a licensed tradesperson to quote the actual repair cost for any major items. A written quote carries far more weight than “the inspector said it needs fixing.”

Step 2: Decide what matters. Not every defect justifies a price reduction. Focus on items that are genuinely expensive, structural, or would affect your ability to rent the property.

Step 3: Present your case. Through your conveyancer or solicitor, present the inspection findings and repair quotes to the vendor. Frame it as factual, not emotional. “The inspection identified X, the repair quote is $Y, we’d like to adjust the price accordingly.”

Step 4: Be realistic. Vendors aren’t obligated to reduce the price. In competitive markets, they might tell you to take it or leave it. Factor that into your strategy.

Common outcomes:

• Price reduction matching repair costs (most common for significant items)
• Vendor agrees to complete repairs before settlement
• Split the cost, both parties meet halfway
• Vendor provides credit at settlement for the buyer to manage repairs
• No movement, buyer decides whether to proceed at original price

We’ve negotiated thousands off purchase prices based on B&P findings. The report pays for itself many times over when it uncovers something real.

The B&P Clause in Your Contract

How the building and pest clause works depends on your state.

Queensland: The REIQ contract includes a standard building and pest clause. You typically get 14 to 21 days for inspections. If you’re not satisfied with the results, you can terminate the contract, provided you’re acting reasonably. “Reasonably” is the key word, you can’t use a cracked tile as an excuse to walk away because you changed your mind.

Victoria: Contracts include a building report clause allowing the purchaser to end the contract within a set period (usually 14 days) if a report from a registered building practitioner reveals major structural defects.

NSW: Building and pest clauses are typically added as special conditions. They’re not part of the standard contract, so your conveyancer needs to include them. If you’re buying at auction in NSW, there’s no cooling-off period and no B&P clause, so get the inspection done before auction day.

Western Australia: Conditions can be included in the offer, usually with 14 to 21 days for inspections. Your settlement agent will advise on the standard wording.

The clause protects you. Never sign a contract without one, unless you’ve already had the inspection done (which is common at auctions).

When to Walk Away

Walking away from a property you’re emotionally attached to is hard. But sometimes it’s the right call.

Walk away when:

• Active termite damage to structural timbers with no clear history of treatment
• Foundation issues that require underpinning (costs can spiral)
• The inspector recommends further invasive investigation and the vendor won’t allow it
• Multiple major defects that collectively represent a repair bill exceeding 5-10% of the purchase price
• The property has been previously patched up without addressing the underlying cause (cosmetic repairs hiding structural problems)

Don’t walk away just because:

• The report lists 20+ minor items (that’s normal for older properties)
• There’s evidence of past termite treatment (this means the issue was identified and managed)
• The property needs a new hot water system or has dated fixtures
• There are cosmetic cracks in plaster or render
• The report mentions “conducive conditions” for termites (most properties have some)

The report is a tool, not a verdict. Use it to make an informed decision, not to scare yourself out of a good investment.

Choosing an Inspector

Not all inspectors are equal. A cheap inspector who misses a major defect costs you far more than a thorough one who charges a premium.

What to look for:

• Licensed and insured (check they carry professional indemnity insurance)
• Conducts inspections to AS 4349.1 (Australian Standard)
• Provides thermal imaging as standard or as an add-on
• Includes detailed photos in the report
• Willing to take your call after the inspection to walk through the findings

What to avoid:

• Inspectors recommended by the selling agent (conflict of interest)
• Anyone who provides a verbal-only report
• Inspectors who rush through in under an hour (a thorough inspection of a standard house takes 2 to 3 hours)

If you’re buying interstate, your buyers agent or conveyancer can recommend inspectors in the area. We maintain a network of trusted inspectors across every state.

What Happens After the Inspection

Once you have the report, the process depends on what it finds:

1. Clean report (minor items only): Proceed with confidence. Budget for normal maintenance.
2. Moderate issues: Get repair quotes. Negotiate a price reduction or vendor repairs. Proceed if the numbers still work.
3. Major structural or pest issues: Consider walking away. If the property is otherwise exceptional, get specialist quotes and negotiate hard, but be prepared to move on.

Run the adjusted numbers through a cash flow calculator with the repair costs factored in. Sometimes a property with issues at a reduced price is still a better buy than a clean property at full price.

For first-time investors, the inspection is also an education. You’ll learn more about property condition and maintenance requirements in one B&P report than from any book or course.

This is general information only and not financial advice. Always engage qualified professionals for building inspections and seek independent legal advice on contract conditions.

If you want a buyers agent who reviews every B&P report before you commit to a purchase, book a free discovery call.