Yes, a building inspector can absolutely help identify unpermitted work on a property. In New Zealand, unpermitted building work is more common than many buyers and homeowners realise, and discovering it early can save you from significant legal, financial, and safety headaches down the track. Whether you're buying a home, planning a renovation, or selling up, a professional building inspection is one of the smartest investments you can make.
What Is Unpermitted Work?
Unpermitted work (sometimes called unauthorised or unconsented work) refers to building work that required a building consent under the New Zealand Building Code but was carried out without one. This can include:
- Additions or alterations to a home (e.g. new rooms, garages, decks over 1.5 m high)
- Structural changes such as removing load-bearing walls
- Plumbing or drainage alterations
- Retaining walls over certain heights
- Sleepouts or minor dwellings
- Relocated buildings
Not all building work requires consent — Schedule 1 of the Building Act 2004 lists exemptions for minor work. However, the rules can be complex, and what looks like a simple job may still require consent. Always confirm with your local council before assuming work is exempt.
How Does a Building Inspector Identify Unpermitted Work?
A qualified building inspector uses a combination of visual assessment, experience, and document review to flag work that may not have been properly consented or inspected. Here's how they typically approach it:
Reviewing Council Records
A good inspector will recommend (or assist you in) obtaining a LIM report (Land Information Memorandum) from the local council. This document lists all consents, inspections, and code compliance certificates (CCCs) recorded for the property. If a structure appears on the property but isn't on the LIM, that's a red flag.
Visual Inspection of the Property
Experienced inspectors look for tell-tale signs of work that may not have gone through the proper process:
- Inconsistent materials or finishes that suggest later additions
- Structural elements that don't align with standard practice under NZS 3604 (the timber-framed buildings standard)
- Plumbing or electrical work that looks DIY or non-compliant
- Rooms or spaces that don't appear on the original plans
- Weathertightness concerns around additions or cladding changes — particularly important given New Zealand's leaky building history
Comparing Plans to Reality
If the original building plans are available (often held by council), the inspector can compare what's on paper with what's actually built. Discrepancies are a strong indicator of unpermitted changes.
Why Does Unpermitted Work Matter?
Unpermitted work carries real risks for buyers and owners:
| Risk | Detail |
|---|---|
| Safety | Work done without inspections may not meet the NZ Building Code, posing structural or fire risks |
| Insurance | Insurers may decline claims related to unconsented work |
| Resale | Unpermitted work must be disclosed and can reduce property value or kill a sale |
| Retrospective consent | Getting a CCC after the fact can be costly and may require opening walls or demolishing work |
| Legal liability | Under the Building Act, owners can be required to remedy or remove non-compliant work |
MBIE Building Performance has detailed guidance on what happens when unpermitted work is discovered, including the process for applying for a certificate of acceptance — a retrospective approval available in some circumstances.
What Happens If Unpermitted Work Is Found?
If your building inspector flags potential unpermitted work, don't panic — but do act. Steps typically include:
- Get a LIM report from the council to confirm what's consented
- Consult a Licensed Building Practitioner (LBP) to assess the work's compliance — find one at LBP
- Contact your local council to discuss options, which may include a certificate of acceptance or a retrospective consent
- Negotiate with the vendor if you're buying — unpermitted work is a legitimate reason to renegotiate price or ask for remediation
- Check with your insurer about how the work affects your cover
For electrical or plumbing work that appears unpermitted, this is especially serious. Electrical work must be carried out by a registered electrician and certified — check the Electrical Workers Registration Board (EWRB). Plumbing and drainlaying is restricted work under the Plumbers, Gasfitters and Drainlayers Board (PGDB). Uncertified work in these areas poses genuine safety risks.
Safety note: Never ignore suspected unpermitted electrical or structural work. If you have concerns about immediate safety, stop using the affected area and seek professional advice promptly.
When to Call a Professional
You should engage a qualified building inspector if you are:
- Buying a property — always get a pre-purchase inspection before going unconditional
- Selling a home — a pre-sale inspection helps you identify and address issues before they derail a deal
- Planning a renovation — understanding the existing structure and any past work helps you plan safely and legally
- Concerned about a neighbour's work that may affect your property
A building inspector won't have the legal authority to enforce anything, but their report gives you the evidence and knowledge to take the right next steps. Look for inspectors with relevant qualifications, experience, and professional indemnity insurance. You can find qualified local building inspectors on tradedirectory.co.nz.
BRANZ is New Zealand's leading building research organisation and a useful resource for understanding building standards and compliance requirements.
Licensed Building Practitioner (LBP)
BCITO Qualified
