Wellington sits directly above several active fault lines, making seismic safety a non-negotiable consideration for anyone purchasing property in New Zealand’s capital. The Wellington Fault runs through the heart of the city, and scientists estimate it could produce an earthquake of up to magnitude 8. For property buyers, this geological reality boils down to one critical question: Is the building you’re considering earthquake-prone?
The earthquake-prone building register exists specifically to answer this question. Yet many buyers overlook this resource during their property search, only to face unexpected strengthening costs or insurance complications after purchase. This guide explains everything you need to know about checking the register, understanding NBS ratings, and protecting yourself from costly surprises when buying property in Wellington.
A building is legally classified as earthquake-prone when its structural capacity falls below 34% of the New Building Standard (NBS). This percentage represents how well a building can withstand earthquake forces compared to a newly constructed building on the same site. Think of it like comparing a vintage car’s safety features against a modern vehicle equipped with airbags and advanced crash protection—both can function, but they respond very differently under stress.
Wellington is classified as a high-seismic-risk area under New Zealand’s Building Act 2004, meaning property owners face stricter requirements and shorter timeframes for addressing earthquake-prone buildings. As of late 2024, Wellington had approximately 575 buildings on the earthquake-prone register, down from over 1,000 a few years earlier as owners strengthened or demolished non-compliant structures.
The Ministry of Business, Innovation and Employment (MBIE) manages the national register, which provides public access to information about buildings that territorial authorities have determined to be earthquake-prone. When a building receives an earthquake-prone building (EPB) notice, owners must display this notice in a prominent location at the building’s entrance.
Before making an offer on any Wellington property, checking the EPB register should be at the top of your due diligence list. The national register is publicly accessible through MBIE’s Building Performance website. You can search by address, street name, or suburb to find information about specific buildings.
The register shows several key pieces of information for each listed building: the NBS rating percentage, the date the EPB notice was issued, whether it’s classified as a priority building, and the deadline for completing strengthening or demolition work. Understanding these details helps you assess the financial implications before committing to a purchase.
Beyond the national register, requesting a Land Information Memorandum (LIM) report from Wellington City Council provides additional context. A LIM may identify earthquake risks and other hazards that could affect your property decision. The council has conducted over 6,400 earthquake assessments since 2006, with approximately 1,000 buildings receiving formal earthquake-prone notices.
The EPB register captures buildings that have been formally assessed and determined earthquake-prone, but it doesn’t include buildings that haven’t yet been assessed or those with NBS ratings between 34% and 67%. Buildings in this middle range are considered earthquake-risk buildings rather than earthquake-prone, but they may still present challenges for insurance and financing.
Many corporate tenants and insurance companies prefer buildings rated at 67% NBS or higher. If you’re purchasing a property with a rating below this threshold, you may face higher insurance premiums or even difficulty finding coverage.
The percentage of the New Building Standard (%NBS) rating system provides a standardised way to compare seismic performance across different buildings. Rather than predicting whether a building will fail in any particular earthquake, NBS ratings indicate relative risk compared to new construction.
Buildings fall into several categories based on their ratings. Those with NBS below 34% are earthquake-prone and require remediation within specified timeframes. Buildings rated between 34% and 67% NBS are considered earthquake-risk buildings—not legally required to be strengthened but potentially problematic for insurance and financing. Buildings at 67% NBS or above are generally considered acceptable seismic risk by the New Zealand Society for Earthquake Engineering.
A building’s NBS rating directly affects its market value. Properties with earthquake-prone status typically sell at significant discounts, sometimes half their potential value, to account for required strengthening work. However, buyers seeking bargains should carefully calculate total costs before assuming a discounted price represents genuine value.
Seismic assessments come in two forms. An Initial Seismic Assessment (ISA) provides a preliminary estimate of likely seismic rating, often used by councils to identify potentially earthquake-prone buildings. A Detailed Seismic Assessment (DSA) involves a comprehensive analysis of all critical structural elements and produces the definitive NBS rating.
During a detailed assessment, engineers evaluate the vulnerability of columns, floors, parapets, heavy exterior cladding, and other elements that could become safety hazards during an earthquake. The building receives an overall rating based on its weakest element—meaning a single structural deficiency can determine the entire building’s classification.
Assessment costs vary significantly based on building complexity. Basic IEP (Initial Evaluation Procedure) reports typically range from $2,000 to $5,000, whilst detailed assessments for complex commercial buildings may cost considerably more. When purchasing property, consider whether existing assessments are current and conducted using an appropriate methodology.
Property owners in Wellington operate under specific timeframes for addressing earthquake-prone buildings. Under the Building Act, owners of non-priority earthquake-prone buildings typically have 15 years from the date they receive their EPB notice to complete strengthening or demolition work. Priority buildings—those presenting higher public safety risks—must be remediated within 7.5 years.
The Government announced significant changes to the earthquake-prone building system in September 2025. Under the new framework, NBS percentage ratings for strengthening requirements are being removed in favour of a risk-based system that varies requirements based on building type and location. Four-year deadline extensions were also granted for buildings whose deadlines hadn’t lapsed as of April 2024.
These regulatory changes mean buyers must pay close attention to both current status and future obligations. A building currently showing a distant deadline may face different requirements once new legislation takes effect. Wellington Mayor Tory Whanau described the changes as removing a billion-dollar burden from the city, but individual property owners must still understand their specific obligations.
Some earthquake-prone buildings face accelerated remediation timeframes due to their classification as priority buildings. Traditionally, this category included hospitals, emergency service buildings, educational facilities, and buildings on routes identified as strategically important for emergency access.
Under the reformed system announced in 2025, priority status will focus more narrowly on unreinforced masonry buildings with facades that could fall onto busy footpaths and roads, as well as buildings that could block emergency routes if they collapsed. Priority status is being removed from buildings such as hospitals and fire stations, giving government agencies more time to plan seismic risk mitigation.
For residential buyers, understanding priority classification is important because it affects the timeframe for completing work. Purchasing a priority building with an approaching deadline creates urgent financial pressure that could significantly impact your investment.
Seismic strengthening represents a substantial financial commitment that varies dramatically based on building characteristics. On average, construction costs for seismic strengthening run approximately $1,500 per square metre, though this figure can increase significantly for buildings with complex structural systems, heritage status, or multiple deficiencies requiring attention.
Apartment owners in Wellington have faced particularly challenging circumstances. Survey data from the Inner City Wellington residents’ association found individual strengthening bills ranging from $93,000 to over $800,000, with an average cost of $241,571 excluding GST. Once professional fees, consent costs, interest, and GST are included, total costs can exceed the property’s rateable value.
Beyond direct construction costs, strengthening projects typically take 3 to 4 years from initial engagement to completion. During this period, buildings may face disruption, reduced rental income, or even temporary closure depending on the work required. These indirect costs should factor into any purchase decision involving an earthquake-prone building.
Several support mechanisms exist for owners facing strengthening obligations. The Residential Earthquake-prone Building Financial Assistance Scheme provides suspensory loans to help apartment owners and investors struggling with strengthening costs. Kāinga Ora offers loans of up to $250,000 for eligible property owners.
Wellington City Council also offers rates remissions for owners actively carrying out earthquake strengthening work. These remissions can provide some relief during the construction period, though they don’t address the underlying capital costs.
For heritage-listed buildings, the Heritage Earthquake Upgrade Incentive Programme may provide additional funding, recognising the greater complexity and cost of strengthening buildings with heritage protections.
Insurance represents one of the most significant practical challenges for earthquake-prone building owners. Insurers view Wellington as a higher seismic risk area, and buildings with low NBS ratings face premium increases that can make ownership financially unsustainable.
Case studies from Inner City Wellington documented insurance premium increases of up to 320% for earthquake-prone buildings. One small apartment block saw premiums jump from approximately $10,000 in 2012 to over $42,000 by 2019. Buildings with particularly low ratings—some as low as 1% NBS—may struggle to obtain coverage at any price.
Even buildings strengthened above the 34% threshold can face insurance challenges. One Wellington building, strengthened to 45% NBS at a cost exceeding $1 million, still faced ongoing premium pressures because it remained below the 67% threshold preferred by insurers.
Before purchasing any Wellington property, verify current insurance arrangements and seek independent advice about likely future premiums. A building that appears affordable based on purchase price may become financially burdensome once insurance costs are factored in.
Pre-purchase building inspections play a crucial role in understanding seismic risk, though their scope differs from formal engineering assessments. A building inspection identifies visible structural concerns, settlement issues, foundation problems, and other factors that may relate to earthquake performance, but it doesn’t replace a detailed seismic assessment.
Experienced Wellington building inspectors understand the specific challenges facing properties in this region. They can identify potential concerns related to building age, construction type, foundation conditions, and visible structural modifications that might affect seismic performance. This information helps buyers understand whether further engineering assessment may be warranted.
For properties not currently on the EPB register, an inspection may identify characteristics suggesting the building could be at risk if formally assessed. Unreinforced masonry construction, soft-storey configurations, irregular floor plans, and certain foundation types all represent potential seismic vulnerabilities worth investigating further.
When considering any Wellington property, gather answers to these questions: Has the building been formally assessed for seismic performance? If so, what methodology was used, and when was the assessment completed? What is the current NBS rating, and has it changed following recent engineering assessments? If earthquake-prone, what is the deadline for remediation and what work is required?
Also, investigate insurance history. What are current premiums, and how have they changed over recent years? Have any insurers declined to provide coverage? What conditions or exclusions apply to earthquake-related claims?
For apartment buildings, understand the body corporate’s plans for addressing any seismic requirements. What reserves exist for strengthening work? Have owners agreed on a remediation approach? What happens if some owners cannot afford their share of costs?
Wellington’s dramatic topography means seismic risk varies significantly across different suburbs. Properties built on solid rock in hillside suburbs generally face different challenges than those on flat land, much of which is reclaimed and potentially subject to liquefaction during strong shaking.
The It’s Our Fault programme studies Wellington’s faults and helps communities prepare for major earthquakes. Their research highlights how different areas of Wellington may experience vastly different effects during the same seismic event, depending on underlying soil conditions and proximity to fault lines.
Ground shaking amplification occurs when buildings sit on soft soil rather than bedrock. Areas with significant reclaimed land or alluvial deposits may experience more intense shaking than nearby areas with better foundation conditions. A building’s NBS rating accounts for its specific location, but understanding local geology helps buyers appreciate relative risk levels.
The Government’s September 2025 announcement represents the most significant reform to earthquake-prone building regulations since the current system took effect in 2017. Understanding these changes matters for anyone purchasing property subject to EPB requirements.
Under the reforms, thousands of buildings nationwide will be removed from the earthquake-prone system entirely. The new framework targets buildings that pose a genuine life-safety risk in medium- and high-seismic zones, with requirements varying by building type and location. Only approximately 80 buildings nationwide are expected to require full retrofit under the new system.
Unreinforced masonry buildings under three storeys in small and rural towns will no longer require remediation or warning notices, though owners must secure facades before removal from the register. Concrete buildings of three or more storeys will require targeted retrofit, whilst unreinforced masonry buildings three storeys or higher in urban centres will need full retrofit.
For Wellington specifically, these changes should reduce the overall burden on property owners, though the city’s high seismic zone classification means stricter requirements apply compared to lower-risk areas like Auckland.
Search the national EPB register at epbr.building.govt.nz using the property address. You can also request a LIM report from Wellington City Council, which includes earthquake-related information about the property.
A 34% NBS rating means the building has one-third the seismic capacity of a newly constructed building on the same site. Buildings below this threshold are legally classified as earthquake-prone and must be strengthened or demolished within specified timeframes.
Financing earthquake-prone buildings has become increasingly difficult. Many lenders are reluctant to provide mortgages for buildings with low NBS ratings, and those that do may impose conditions or require higher deposits. Discuss options with multiple lenders before making offers.
Non-priority buildings typically have 15 years from the date of receiving an EPB notice. Priority buildings have 7.5 years. Recent four-year deadline extensions apply to buildings whose deadlines hadn’t lapsed as of April 2024. Specific deadlines are recorded on the EPB register.
This scenario affects some Wellington apartment owners. Options include selling at a discount, demolition, or seeking financial assistance through government schemes. Body corporates may face difficult decisions when some owners cannot meet their share of costs.
Not necessarily. Building age is one factor, but construction type, materials, previous strengthening work, and specific structural design all influence seismic performance. Some older buildings have been upgraded to acceptable standards, whilst some newer buildings may have deficiencies.
Purchasing property in Wellington requires accepting that earthquake risk forms part of the equation. However, informed buyers who understand the EPB register, NBS ratings, and potential strengthening costs can make confident decisions that protect their investment and safety.
The key is thorough due diligence before committing to a purchase. Check the earthquake-prone building register, request comprehensive LIM reports, investigate insurance implications, and for any building with seismic concerns, consider whether a detailed engineering assessment is warranted before proceeding.
A pre-purchase building inspection provides another layer of protection, helping identify visible structural concerns and potential issues that warrant further investigation. Combine inspection findings, register searches, and professional advice to build a complete picture of a property’s seismic status.
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Catherine Jones says:
The valuers I work with in Wellington have definitely tightened their approach on earthquake-prone buildings and they’re now flagging heritage properties especially hard even when the owners have solid remediation plans in place. Worth getting ahead of it before you buy rather than discovering mid-purchase that your valuation’s dropped 15-20%.
Nathan Cooper says:
I’ve been trying to figure out exactly how strict the council is with remediation timelines. Do you know if there’s much flexibility if a building’s borderline on the register, or are they pretty rigid about the deadlines? Also curious whether getting a full structural report before making an offer is something most buyers are doing now, or if that’s still considered unusual in Wellington’s market.
Morgan Kircher says:
Each council is different and that is outside our remit. If we feel the need to recommend a full structural report we will let you know. Other wise we would not. But it is still completely up to you if you decide to enlist the services of a structual engineer.
Jim McD says:
The bit about getting a structural engineer’s report before you commit is crucial for us remote buyers—you can’t just rely on the council register and hope for the best when you’re managing this from overseas. Seen too many investors get stung because they assumed the register was comprehensive, but it’s really just a starting point for due diligence.