You've made an offer and now it's conditional on a building inspection. You book an inspector, they spend a couple of hours at the property, and 24 hours later a 30-page report lands in your inbox. But how much of the property does it actually cover — and what can it miss?
Understanding the scope and limitations of a builder's report is essential for using it properly in your due diligence.
What a Builder's Report Actually Is
A builder's report (also called a building inspection report or pre-purchase inspection report) is a written assessment of the visible and accessible condition of a property on the day of inspection. It is not a guarantee, a valuation, or a council compliance check.
A qualified building inspector will systematically examine the property's key components and rate any findings by severity — typically from urgent safety issues through to minor maintenance items. The report gives you a factual snapshot that you can use to make an informed decision and, where necessary, negotiate with the vendor.
A builder's report is a visual inspection only. Inspectors cannot open up walls, lift floor coverings, or access areas that are genuinely inaccessible. It is entirely possible for a report to come back with no major findings and still have significant hidden issues — which is why it works best alongside a LIM report and, for at-risk properties, a specialist weathertightness assessment.
What Is (and Isn't) Included
- Roof condition (exterior visual)
- Gutters and downpipes
- Exterior cladding and weatherboards
- Windows, doors, and frames
- Interior walls and ceilings
- Floors and floor coverings (visible)
- Subfloor space (if accessible)
- Roof space (if accessible)
- Moisture readings in key areas
- Garage and outbuildings
- Obvious health and safety hazards
- Overall site drainage (visible)
- Hidden areas behind wall linings
- Underground drainage or pipes
- Full electrical testing
- Full plumbing pressure testing
- Asbestos testing (lab analysis)
- Swimming pools or spas
- Structural engineering calculations
- Building consent compliance checks
- Weathertightness invasive testing
- Valuation or market assessment
- Pest inspection (unless stated)
- Earthquake prone building assessment
The key limitation is that inspectors work visually. Unless they have thermal imaging equipment or moisture meters that detect anomalies behind a surface, they cannot see what's inside walls. A building that looks fine on the day of inspection could have significant moisture damage hidden behind intact-looking linings.
How to Choose a Good Inspector in NZ
Building inspection is not a licensed profession in New Zealand — anyone can legally call themselves a building inspector. This makes choosing the right person genuinely important. Here's what to look for:
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Check for professional membership Look for inspectors who are members of the New Zealand Institute of Building Inspectors (NZIBI) or the Building Officials Institute of New Zealand (BOINZ). These organisations set standards and require members to hold relevant qualifications.
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Verify qualifications and experience A qualified builder, licensed building practitioner (LBP), or registered architect with inspection experience is preferable to someone with only a certificate in property inspection. Ask specifically about their background.
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Confirm professional indemnity insurance If the inspector misses a major defect, you want recourse. Ask directly: "Do you hold professional indemnity insurance, and what is the coverage amount?" A reputable inspector will answer clearly.
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Ask about their equipment Do they use a moisture meter? Thermal imaging camera? Drone for roof inspection? These tools significantly expand what an inspector can identify. Not all inspectors carry them — premium tools often cost more but can find issues a visual inspection alone would miss.
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Check the report format and turnaround time Ask to see a sample report. It should be detailed, photo-rich, and categorise findings by severity. Confirm they can deliver within your due diligence window — most inspectors turn around reports in 24–48 hours.
Don't use an inspector recommended by the selling agent. The inspector should work exclusively for you, with no relationship to the vendor or agent. Your lawyer or buyers' advocate can recommend independent inspectors if needed.
The 10 Questions to Ask After Getting Your Report
Receiving the report is only the first step. These are the questions every buyer should get answered before going unconditional:
Ask your inspector to prioritise. A 30-page report with 15 findings looks alarming; understanding which two or three actually matter is essential.
Inspectors are not quantity surveyors, but most will give a rough range. Get this in writing if possible — it gives you a basis for negotiation.
Moisture readings, deteriorating cladding, or failed window flashings in a home built between 1994–2004 may indicate a leaky building. Ask directly: should I get a specialist weathertightness assessment?
Every report has limitations. Understanding what wasn't assessed helps you decide whether a follow-up specialist inspection is warranted.
A roof replacement in NZ costs $15,000–$50,000+ depending on material and size. Knowing you'll face this cost within 5 years changes the economics of your offer.
Work that doesn't match typical building standards, unusual additions, or materials inconsistent with the age of the home may indicate work done without consent. Cross-reference with the LIM report.
For older unreinforced masonry buildings, ask whether they show signs of earthquake vulnerability. This affects insurance and may indicate an earthquake-prone building designation.
Poor subfloor ventilation is one of the most common sources of moisture-related damage in older NZ homes. It's often inexpensive to improve but expensive to remediate if left for years.
Some issues — certain cladding types, asbestos, specific roof conditions — can make a property difficult or expensive to insure. It's worth asking before you're unconditional.
A blunt question, but a good inspector will give you a straight answer. They've seen hundreds of properties; their gut feel on whether this one is sound is valuable context.
Using the Report to Negotiate
A builder's report is a negotiating tool as much as an information document. If significant issues are found, you have several options:
Request a price reduction. Get independent quotes for the repairs identified. Present these to the vendor with a formal request to reduce the purchase price by the estimated cost. Be specific: vague claims are easy to dismiss; a quote from a licensed tradesperson is not.
Ask the vendor to fix the issues before settlement. This works best for clear-cut problems (a leaking roof, a broken downpipe). Be careful about accepting vendor-arranged repairs for complex issues — insist on licensed tradespeople and confirm the work is properly consented if required.
Request a credit at settlement. Instead of adjusting the purchase price, the vendor provides a credit on settlement day. This achieves the same result but can be administratively simpler.
Walk away using your building inspection condition. If findings are serious and the vendor won't negotiate, your due diligence condition allows you to cancel and recover your deposit. This is the nuclear option, but sometimes the right one.
All of this must happen before you go unconditional. Once you waive your building inspection condition, you have no further rights based on the report's findings. Do not go unconditional before you are genuinely satisfied with the property's condition and any negotiated remedies are confirmed in writing.
Builder's Report vs. LIM Report: How They Work Together
These two documents answer completely different questions and you need both:
- The LIM report tells you what the council knows — consents issued, compliance certificates, flood risk, contamination, zoning. It covers the legal and administrative history of the property.
- The builder's report tells you the physical condition of the building — what's deteriorating, what needs repair, and what risks the structure carries right now.
The most powerful due diligence approach is to read them together. A consent in the LIM for a deck extension, combined with a builder's report noting the deck shows signs of moisture damage, tells you the work was done but done poorly. Neither document alone tells you that story.
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Analyse My Documents →Frequently Asked Questions
A NZ builder's report covers the visible and accessible condition of the property — roof (exterior visual), exterior cladding, windows and doors, interior walls and ceilings, floors, subfloor and roof space (where accessible), and obvious safety hazards. It does not cover hidden areas behind linings, underground drainage, detailed electrical or plumbing testing, or building consent compliance.
A standard builder's report in NZ typically costs $400–$700. Prices vary by property size, location, and inspector qualifications. Thermal imaging and drone roof inspection may cost extra. Always get a written quote before booking.
The physical inspection takes 2–4 hours. Most inspectors deliver the written report within 24–48 hours. Confirm the turnaround time before booking if you're working with a tight due diligence deadline.
Yes — a LIM report and builder's report serve very different purposes. The LIM shows what the council knows about the property. A builder's report shows the physical condition of the building. You need both for complete due diligence.
Yes, and it's highly recommended. Walking through the property with your inspector gives you direct context for the written report. Most inspectors welcome buyers at the inspection — it also gives you the chance to ask questions on the spot.
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