The building inspection report: what NZS 4306 requires

The credential gap

Anyone in New Zealand can operate as a residential building inspector. There is no mandatory licensing regime specific to the work. The inspector you engage may hold:

• Licensed Building Practitioner (LBP) status under the Building Act 2004. LBPs are regulated, insured, subject to a code of ethics, and entered on the public LBP register.
• NZIBI membership. The New Zealand Institute of Building Inspectors is a voluntary industry body with a Code of Ethics and a complaints process. Members are listed on the NZIBI website.
• Professional Indemnity Insurance — not mandatory, but a signal of accountability.

Or the inspector may hold none of these and simply describe themselves as "a qualified builder with 25+ years' experience." The difference matters: a credentialled inspector is accountable; a non-credentialled one is not. You can verify LBP status by searching the public register. You can verify NZIBI membership by checking the NZIBI site. You can ask for proof of PI insurance. If any of these checks draws evasion, that is itself information.

The Inspector Credentials Check tool verifies an inspector's LBP and NZIBI status from their name.

NZS 4306:2005 in one page

NZS 4306:2005 Residential Property Inspection is the New Zealand Standard that defines a competent visual inspection. Its scope:

• Visual and non-invasive. Inspectors do not move furniture, lift carpets, remove cladding, or damage the building. They inspect what is in clear line of sight with reasonable access.
• Grounds, structure, exterior, roofs, plumbing, electrical, interior, insulation and ventilation. These are the areas the report should cover.
• Significant defects. The purpose is to identify material issues — not cosmetic preferences, not routine maintenance items, not interior decorating.
• Calibrated to the building type. A 1910s weatherboard villa will have characteristics (timber movement, floor flexibility, putty deterioration, historic paint wear) that are inherent to the building type and do not constitute defects. Reporting these as defects is a sign of unfamiliarity with the housing stock, or of report padding.

What the Standard explicitly excludes: in-depth testing of mechanical services (heat pumps, water pumps, underfloor heating, solar, pool equipment); pest inspections; asbestos or mould testing beyond visual observation; structural engineering assessment; compliance certification. Reports that drift into these areas without clearly flagging them as outside-scope have over-reached.

Pre-sale vs pre-purchase reports

The context matters. Two common scenarios:

• Pre-purchase inspection — commissioned by a prospective buyer, typically under a building-report condition in the sale and purchase agreement. The inspector's role is to identify issues that might affect the buyer's decision. Conservative caution is appropriate; the buyer is protecting themselves.
• Pre-sale (vendor's) inspection — commissioned by the vendor, typically to demonstrate property condition and build buyer confidence. The inspector's role is to provide an objective, balanced assessment that identifies real issues without inflating minor ones.

A pre-sale report that is more negative than a prior pre-purchase report on the same property, absent any material change in condition, is counter-productive to its stated purpose. The pre-sale report should not make the property look worse than buyers' inspectors will find it themselves. When a pre-sale report contradicts this logic, the usual causes are: an inspector unfamiliar with the building type; an inspector incentivised to produce voluminous "findings" to justify fees; or an inspector whose referral pipeline rewards creating negotiating leverage for the next buyer.

Twelve red flags in a building inspection report

Specific patterns that indicate a report has left NZS 4306 behind. Each is a basis for questioning the report's reliability.

1. Conclusions about areas the inspector could not access. "No underfloor insulation" while also acknowledging the subfloor was not accessible. "Re-piling required" based on limited access. The correct statement is: "Unable to confirm due to access limitations."
2. Interior decorating commentary. "Prep and decorating required" repeated across multiple rooms. Interior decoration is outside the Standard's scope.
3. Replacement recommendations for cosmetic items. "Replace damaged baseboards" for what is paint deterioration; "replace the bath" for hairline fractures in the bath base. Proportionate remediation is repair or resurface, not replacement.
4. Drama in close-up photography. Macro-lens close-ups that remove all sense of scale. A deteriorating putty strip photographed at 5× magnification looks alarming; the same strip at normal distance looks routine.
5. Inspector physically manipulating components. Photos of the inspector pulling at door sills, wiggling fence panels, or pressing against cladding. This is interventionist, not visual-non-invasive.
6. Repetition of the same finding across multiple rooms. Floor flexibility in three separate rooms counted as three separate defects. Inherent building-type characteristics are not separate defects.
7. Scope creep from a minor finding to a major intervention. A single localised drainage issue that triggers a recommendation to repaint the entire exterior of the house. The remediation should be proportionate to the finding.
8. Data that contradicts the narrative. The inspector's own moisture readings are all within the normal range, but the written commentary implies moisture problems. Where the data and the text conflict, the data governs.
9. Photos of personal belongings or private living spaces. Children's bedrooms with toys and beds; occupants' laundry piles; family belongings mid-move. These serve no inspection purpose and engage the Privacy Act 2020 (IPP 1, IPP 4).
10. Misrepresentation of safety systems. Reporting an RCD "trips the mains" as a defect. An RCD is designed to trip on test — that is its function. A report that misrepresents basic electrical safety suggests inspector competence is limited.
11. Era-based generic risks presented as property-specific findings. "Properties of this era may contain asbestos" added to a specific property's report where no asbestos finding is made. The statement is true of all pre-1970s NZ homes and adds nothing specific.
12. Omission of items a competent inspector would find. The surest test is to cross-reference against another report on the same property. An inspection that misses items visible in an earlier report (damaged downpipe, shower door adjustment, chimney cowling corrosion, asbestos advisory) has not met the reasonable-skill standard of CGA section 28.

Reading the report's page count

A useful rough metric: a competent NZS-4306-compliant residential inspection of a typical NZ house produces a 15-25 page report. Longer is not always better. A 45-page report that identifies fewer genuine issues than a 20-page report on the same property has padded the volume. The padding usually consists of cosmetic observations, filler photographs, and repeated recommendations.

This is not an absolute rule — a large or complex house may legitimately produce a longer report. But if the page count substantially exceeds the substance, the report's reliability on specific findings deserves scrutiny. A useful diagnostic: count the number of distinct, cited building-code-relevant findings, divide by the number of pages. Low ratio is report padding.

What to do when a report falls below standard

If you commissioned the inspection and the report is substandard, you have several remedies:

• Reject the report. A report that materially fails NZS 4306 is a service that was not supplied with reasonable care and skill under CGA s.28. You can require remedy, refund, or pursue damages.
• Commission a replacement inspection. At the inspector's cost where the CGA supports it; at your cost if you want to move quickly without litigating the first.
• Raise misleading conduct. Specific statements in the report that are misleading in trade engage Fair Trading Act 1986 section 9.
• Privacy Act complaint. Where photographs are unreasonably intrusive, particularly of children, file a complaint with the Office of the Privacy Commissioner at no cost.
• Withhold authorisation for distribution. If the report contains privacy breaches or material inaccuracies, you can refuse consent for the agency to distribute it to prospective purchasers.

The Building Report Sanity Check tool provides a structured comparison of a report against NZS 4306.

Before engaging an inspector

• Verify the inspector's LBP and NZIBI status on the relevant registers. Not holding either is not a disqualification, but it should be a deliberate choice you make.
• Confirm in writing that the inspection will be conducted to NZS 4306:2005.
• Ask for a sample of a recent comparable report (addresses redacted). Read it against the red flags above.
• Agree the fee in writing. Ask whether the inspector accepts referral fees from agencies; disclosure is required under Rule 9.15 on the agency side, and is relevant to the inspector's independence.
• If the inspection is agency-referred, consider whether a self-engaged inspector gives a more independent result. The agency has a commercial relationship with the referral network; you do not.

Where this guide sits in the section

Previous: Who drafts your disclosure document?.

Next: Healthy Homes reports: the age question.

Rules cited: NZS 4306:2005, CGA 1993, FTA 1986, Privacy Act 2020, PCCC Rules 2012.