A building inspection is one of the best investments you can make when buying a property in New Zealand. A qualified inspector will spend 2–4 hours examining the property and produce a written report detailing their findings. The problem is that most buyers don't know how to interpret what they're reading.
This guide explains the standard structure of NZ building inspection reports, what the different severity ratings mean, and which issues are genuine dealbreakers versus normal wear and tear.
Understanding Severity Ratings
Most NZ building inspection reports use a tiered rating system. The exact terminology varies between inspectors, but the categories are broadly similar:
Safety hazard or significant structural issue
Requires attention before or immediately after purchase. May affect your ability to insure or finance the property.
Significant defect needing prompt repair
Not an immediate safety risk but will worsen and cost more to fix if left unaddressed.
Minor issue to watch over time
Not urgent but should be checked periodically. Common in older homes.
Normal wear and tear
Routine maintenance items. Expected in most properties and not a reason to be concerned.
No building inspection report comes back clean. Every property has findings. The question is whether the issues are manageable or a reason to renegotiate — or walk away.
The Most Common Issues Found in NZ Inspections
1. Moisture and Water Damage
Moisture is the most common and potentially most serious finding in NZ building inspections. Inspectors use moisture meters to test walls, floors, and ceilings. Elevated readings can indicate:
- Plumbing leaks inside walls
- Roof leaks tracking down internal linings
- Weathertightness failure (leaky building syndrome)
- Subfloor moisture from poor drainage or ventilation
A single high moisture reading in an isolated area is often a simple plumbing repair. Widespread elevated readings throughout the building envelope, particularly in homes built with monolithic cladding between 1994–2004, are a serious red flag that may indicate full remediation is needed.
2. Roofing Issues
Roof issues are among the most expensive repairs a homeowner can face. Common findings include:
- Cracked or slipped tiles — Often a straightforward repair, but worth checking how widespread
- Rusted or damaged corrugated iron — May indicate the roof is nearing end of life
- Failed flashings — Flashings around chimneys, skylights, and penetrations are a common entry point for water
- Sagging or uneven roof line — May indicate structural issues with the rafters or purlins
Ask the inspector for their estimate of the roof's remaining useful life. A roof with 5–10 years left can be budgeted for; one that needs immediate replacement changes the economics significantly.
3. Subfloor and Foundation Issues
For older NZ homes built on timber piles, the subfloor space is critical. Inspectors look for:
- Rotted or damaged piles — Can cause uneven floors and structural instability
- Inadequate pile height — Piles should be at least 400mm above ground level
- Standing water or high moisture — Indicates poor drainage; accelerates timber decay
- Pest damage — Borer and wood rot are common in poorly ventilated subfloor spaces
Uneven or bouncy floors are often the first visible sign of subfloor problems. Flag these specifically with your inspector.
4. Electrical Issues
Building inspectors are not licensed electricians and cannot conduct electrical tests, but they can identify obvious concerns:
- Old ceramic fuse boards (no circuit breakers or RCDs)
- Visible non-compliant wiring (aluminium wiring from the 1970s, unprotected cables)
- Absence of smoke alarms (legally required in all NZ rental properties)
- Unsafe DIY electrical work
If electrical concerns are flagged, follow up with a registered electrician. Upgrading an old fuse board typically costs $2,000–$4,000; rewiring a whole house can exceed $15,000.
5. Drainage and Stormwater
NZ's high rainfall means drainage is critical. Common issues include:
- Blocked or broken downpipes and gutters
- Poor site grading (land slopes toward the house rather than away)
- Blocked or inadequate stormwater drains
- Ponding water near the foundation
Poor drainage is a leading cause of subfloor moisture and foundation issues. Check the LIM report for overland flow path notations or flood zone designations.
Issues That Are Usually Not Dealbreakers
Not every finding is cause for alarm. These are common and generally manageable:
- Minor cracks in plaster or gib — Settlement cracking is normal in most homes.
- Weathered or peeling exterior paint — A cosmetic issue and routine maintenance item.
- Stiff or worn door and window hardware — Usually inexpensive to fix.
- Ageing hot water cylinder — Budget around $1,500–$2,500 for replacement.
- Minor borer damage in non-structural timber — Treatable; more serious if structural timber is affected.
- Book a licensed NZ building inspector (check for NZIBI or BOINZ membership)
- Ask if they use moisture meters, thermal imaging, or drone roof inspection
- Confirm the inspection includes subfloor and roof space access
- Check their report format and turnaround time (usually 24–48 hours)
- Read the executive summary first, then the full findings
- Note all items rated urgent or important
- Call your inspector to discuss any findings you don't understand
- Get independent quotes for any significant repairs
- Cross-reference moisture findings with the LIM report
- Decide whether to proceed, negotiate, or cancel before your condition deadline
How to Read a NZ Building Inspection Report
Your building inspector has handed you a 40-page report full of technical language and gradings. What does it actually mean — and which findings should stop you from buying?
A building inspection is one of the best investments you can make when buying property in New Zealand. A qualified inspector will spend 2–4 hours examining the property and produce a written report. The problem is that most buyers don't know how to interpret what they're reading.
This guide explains what the different severity ratings mean, and which issues are genuine dealbreakers versus normal wear and tear.
Understanding Severity Ratings
Most NZ building inspection reports use a tiered rating system:
Safety hazard or structural issue
Requires attention before or immediately after purchase.
Significant defect needing prompt repair
Will worsen and cost more to fix if left unaddressed.
Minor issue to watch over time
Not urgent but should be checked periodically.
Normal wear and tear
Routine maintenance items. Expected in most properties.
No building inspection report comes back clean. Every property has findings. The question is whether the issues are manageable or a reason to renegotiate — or walk away.
The Most Common Issues Found in NZ Inspections
1. Moisture and Water Damage
Moisture is the most common and potentially most serious finding. Inspectors use moisture meters to test walls, floors, and ceilings. Elevated readings can indicate plumbing leaks, roof leaks, weathertightness failure (leaky building syndrome), or subfloor moisture.
A single high moisture reading in an isolated area is often a simple plumbing repair. Widespread elevated readings, particularly in homes built with monolithic cladding between 1994–2004, are a serious red flag that may indicate full remediation is needed.
2. Roofing Issues
Common findings include cracked or slipped tiles, rusted corrugated iron, failed flashings around chimneys and skylights, and sagging roof lines that may indicate structural issues. Ask the inspector for their estimate of the roof's remaining useful life.
3. Subfloor and Foundation Issues
For older NZ homes on timber piles, inspectors look for rotted or damaged piles, inadequate pile height (should be 400mm+ above ground), standing water, and pest damage. Uneven or bouncy floors are often the first visible sign of subfloor problems.
4. Electrical Issues
Building inspectors can identify old ceramic fuse boards, visible non-compliant wiring, absence of smoke alarms, and unsafe DIY electrical work. If electrical concerns are flagged, follow up with a registered electrician. Upgrading a fuse board typically costs $2,000–$4,000.
5. Drainage and Stormwater
Common issues include blocked downpipes and gutters, poor site grading, blocked stormwater drains, and ponding water near the foundation. Check the LIM report for overland flow path notations or flood zone designations.
Issues That Are Usually Not Dealbreakers
Using the Report to Negotiate
A building inspection report is also a negotiating tool. If significant issues are found, you can request the vendor fix the issues, renegotiate the purchase price, request a credit at settlement, or cancel the agreement and walk away.
Get quotes from licensed tradespeople first. "The inspection found some moisture" is a weak position; "remediation quotes total $28,000" is much stronger.
Once you go unconditional on a NZ property, you can no longer use building inspection findings to cancel or renegotiate. Your building inspection condition must be resolved before you go unconditional.
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Analyse My Building Report →Frequently Asked Questions
How much does a building inspection cost in NZ?
A standard building inspection in NZ typically costs $400–$700. Some inspectors charge extra for thermal imaging or drone roof inspection. Always get a written quote before booking.
Who should I use for a building inspection in NZ?
Look for inspectors who are members of the New Zealand Institute of Building Inspectors (NZIBI) or Building Officials Institute of NZ (BOINZ). Ask about their qualifications and whether they carry professional indemnity insurance.
Can I attend my own building inspection?
Yes, and it's highly recommended. Walking through the property with your inspector gives you context for the written report. Most inspectors welcome buyers at the inspection.
What if the building inspection reveals major problems?
Review your Sale and Purchase Agreement with your lawyer. Most agreements include a building inspection condition that allows you to cancel or renegotiate if findings are unsatisfactory.