You’ve found a property in Christchurch that ticks all the boxes. The price is right, the location works, and that renovated bathroom looks fantastic. But here’s a question that could save you tens of thousands of dollars: Was that renovation done legally?
Unpermitted building work in Christchurch homes is more common than most buyers realise. Industry estimates suggest roughly one in five New Zealand properties contains some form of unconsented work. In a city that underwent rapid rebuilding after the earthquakes, the chances of encountering illegal building work are particularly high. This guide will show you exactly what to look for and how to protect yourself before signing on the dotted line.
Christchurch has a unique history that makes unconsented renovations NZ buyers should be aware of, especially in Christchurch. The post-earthquake rebuild created enormous pressure on the construction industry. Homeowners were desperate to repair damage, tradespeople were stretched thin, and in some cases, corners were cut.
Beyond earthquake-related work, common scenarios that lead to unpermitted alterations include:
The problem isn’t always intentional rule-breaking. Many homeowners genuinely don’t understand when building consent is required, particularly for internal alterations that seem straightforward.
Under the Building Act 2004, most building work in New Zealand requires consent from the local council. This includes structural changes, plumbing and drainage modifications, electrical work beyond minor repairs, and anything affecting weathertightness.
Work that typically requires consent includes:
Some minor work is exempt under Schedule 1 of the Building Act, but the exemptions are subject to specific conditions. Just because something seems simple doesn’t mean it’s exempt.
During your property viewings, keep an eye out for these red flags that may indicate unpermitted building work in Christchurch properties.
Inconsistent flooring between rooms can suggest that walls were moved or spaces reconfigured. If you notice the kitchen has different floor heights from the adjacent hallway, or tiles that don’t quite line up at a doorway, ask questions.
Ceiling heights that vary from room to room deserve attention. A lower ceiling in one section might indicate a converted attic space or work done without proper engineering input.
Electrical outlets and light switches in unusual positions may indicate DIY electrical work. Multiple power boards daisy-chained together can suggest the original wiring wasn’t designed for current usage.
Plumbing that seems to have been added as an afterthought—exposed pipes, awkward bathroom layouts, or drainage that gurgles—may indicate work done without proper consent or inspection.
Extensions that don’t quite match the original house in terms of materials, roofline, or style warrant investigation. A professionally consented extension usually blends more seamlessly with the existing structure.
Sleepouts, granny flats, or converted garages are high-risk areas (this is about to change). These additions frequently lack the proper consents, particularly when they include plumbing or have been set up as separate living spaces.
Retaining walls, especially taller ones, often require engineering sign-off. Walls that lean, crack, or appear to have been built without proper drainage are concerning.
Decks and pergolas might seem harmless, but those above a certain height or attached to the house often require consent. Look for signs of DIY construction, such as inconsistent spacing, inadequate foundations, or poor-quality materials.
If the vendor seems reluctant to discuss the property’s renovation history, consider why. Most proud homeowners love talking about improvements they’ve made.
Marketing materials that emphasise features such as “bonus room” or “versatile space” without mentioning the consent status should prompt further investigation.
Properties sold “as is where is” sometimes carry this designation because of consent issues the vendor wants to avoid addressing.
Before making an offer, you can check which building consents are in place for a property. Christchurch City Council maintains records of building consents and Code Compliance Certificates (CCCs) for properties in its district.
You can request a Land Information Memorandum (LIM) report, which will show all building consents issued for the property along with any notices, requisitions, or compliance issues. A LIM costs several hundred dollars but provides valuable peace of mind.
For a quicker preliminary check, you can view building consent information through the council’s online property search. This won’t give you the full picture, but it can flag obvious discrepancies.
When reviewing records, compare what’s documented against what you can see in the property. A three-bedroom house with consent records showing only two bedrooms is an immediate red flag. Similarly, a bathroom that doesn’t appear in any consent documentation deserves scrutiny.
Purchasing a property with unconsented building work can create significant headaches. You may face:
The financial impact can be substantial. Obtaining a Certificate of Acceptance from Christchurch council isn’t cheap, and if work doesn’t meet code, you’ll face remediation costs on top of the application fees.
When unpermitted work is discovered, one option is to apply for a Certificate of Acceptance (COA). This is a retrospective process that allows the council to assess work carried out without consent.
A COA doesn’t mean the work complies with the building code—it simply confirms the council has assessed the work as far as reasonably practicable. The council cannot inspect elements that are concealed behind walls or underground, so a COA provides less assurance than a standard Code Compliance Certificate.
The process typically involves:
Some work may not be suitable for a COA if it clearly doesn’t meet code requirements. In these cases, you might face removal or significant modification of the unpermitted work.
A thorough pre-purchase building inspection is one of your best defences against buying a property with hidden consent issues. An experienced inspector knows what to look for and can identify telltale signs of unpermitted work that casual buyers might miss.
During an illegal building work inspection, qualified inspectors examine:
It’s worth noting that building inspectors cannot definitively confirm whether work has consent—only council records can. However, they can identify work that appears to have been done without professional oversight and recommend further investigation.
If an inspector notes concerns about potential unconsented work, this gives you leverage to negotiate with the vendor or to make your purchase conditional on satisfactory resolution of consent issues.
Don’t be shy about asking direct questions. The vendor has an obligation to disclose known defects, and consent issues can constitute a defect.
Consider asking:
Honest vendors will answer these questions straightforwardly. Evasive responses should prompt you to conduct additional due diligence.
When making an offer on a property where you have consent concerns, work with your solicitor to include appropriate conditions. These might include:
Your solicitor can also review the title and any existing documentation to identify consent-related issues before you commit to the purchase.
If you discover unpermitted work after purchase, you have several options depending on the circumstances.
For minor work, you might choose to live with it and address consent issues when you eventually sell. Be aware that this may affect your insurance coverage and could create liability if something goes wrong.
For more significant work, applying for a Certificate of Acceptance makes sense. This legitimises the work as far as possible and provides documentation for future buyers.
If work is unsafe or clearly doesn’t meet code, you may need to engage professionals to remediate or remove it. This can be expensive, but living with substandard building work poses real risks.
In some cases, you may have legal recourse against the vendor if they failed to disclose known consent issues. Consult a property lawyer about your options.
Industry estimates suggest approximately one in five New Zealand homes contains some form of unconsented work. Christchurch’s post-earthquake rebuild period likely increased this percentage locally, as the pressure to repair homes quickly sometimes led to shortcuts.
Insurance companies vary in their approach, but many will decline to cover unpermitted work or may exclude it from your policy. Some insurers won’t cover the entire property if significant unconsented work exists. Always disclose known consent issues to your insurer.
Fees vary depending on the complexity of the work, but expect to pay several thousand dollars for the application and inspection process. If additional reports, engineering assessments, or destructive testing are required, costs can increase substantially.
Not always. Inspectors can identify signs that suggest unpermitted work, but they cannot see inside walls or underground. Some well-executed unpermitted work may not be visually distinguishable from consented work. Inspectors recommend further investigation when they notice concerning signs.
Yes, councils have powers under the Building Act to require the removal or modification of work that doesn’t comply with the building code. They can also issue fines. However, councils typically prefer to work with homeowners to resolve issues rather than pursue enforcement immediately.
A Code Compliance Certificate (CCC) is issued when consented work is completed and inspected, confirming it meets building code requirements. A Certificate of Acceptance (COA) is issued retrospectively for work done without consent, confirming only that the council has assessed visible elements as far as reasonably practicable—it doesn’t guarantee code compliance.
Buying a home is likely the biggest purchase you’ll ever make. Taking time to investigate potential consent issues before you commit can save you from expensive surprises down the track. Look for the warning signs, check council records, ask the vendor direct questions, and always get a thorough pre-purchase building inspection.
If something doesn’t add up—whether it’s a bathroom that appears newer than council records suggest, a sleepout with suspiciously professional plumbing, or a vendor who can’t produce consent documentation—dig deeper before you sign.
A few hundred dollars spent on due diligence now can prevent tens of thousands in remediation costs later. When it comes to unpermitted building work, what you don’t know really can hurt you.
Ready to protect your property investment? Contact Alert Building Inspections for a thorough pre-purchase inspection that examines all aspects of your potential new home, including signs of potential consent issues. Our experienced inspectors know what to look for in Christchurch properties and can help you make an informed decision.
Alert Building Inspection Services provides comprehensive building reports across Christchurch and New Zealand. Trust our expert inspectors to give you clarity and confidence in your property decisions. For professional building inspection services and expert advice, visit our website. Book your building inspection here. You can also read more articles like this on our blog.
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