Earthquake-Prone Buildings and Wellington Mortgages

The thing most buyers get wrong

People assume the bank is the obstacle. In Wellington it usually is not. The bank's condition is that the property must be insurable — and it is the insurer who decides that. A building that cannot get full replacement insurance generally cannot get a standard mortgage, no matter how strong your application is.

So the order of questions matters. Before you ask whether a lender will approve the loan, find out whether an insurer will cover the building, and on what terms.

What %NBS actually means

Seismic performance is expressed as a percentage of New Building Standard, written %NBS. It is an engineer's assessment of how the building would perform in a design-level earthquake compared with an equivalent new build.

Under the Building Act, a building assessed below 34%NBS is classed as earthquake-prone. The territorial authority issues an earthquake-prone building notice, the building goes on the national EPB register, and a deadline is set for strengthening work. Wellington has a high concentration of these because of its seismicity and its older building stock.

Where this bites hardest: apartments and body corporates

For a standalone timber-framed house, seismic rating is rarely the issue — light timber construction generally performs well and these properties are not usually assessed at all. The problem concentrates in multi-unit buildings, particularly older concrete and masonry apartment blocks in and around the central city.

In a unit title building, strengthening is a body corporate matter, and the cost is shared across owners by unit entitlement. That has two consequences for you:

• A special levy for strengthening work can be very large, and it is your liability as an owner even if the work was agreed before you bought.
• A building partway through the strengthening process can be in limbo — not yet compliant, with costs agreed but not yet spent.

Meeting minutes and the long-term maintenance plan are where you find this. Read them before you go unconditional, not after.

What to get before you make an offer

1. Check the council's earthquake-prone building register for the address.
2. Ask for any seismic assessment on the building, and note whether it is an initial or detailed engineering evaluation, and its date.
3. For a unit title, get the disclosure statements, long-term maintenance plan and recent minutes, and look specifically for strengthening resolutions and levies.
4. Get an indicative insurance quote early. This is the step buyers skip and it is the one that most often ends the deal.
5. Talk to your broker before the offer, with the rating and the insurance position in hand.

Strengthened buildings can be a genuine opportunity

The flip side is worth saying. A building that has completed its strengthening work, has the documentation to prove it and a rating comfortably above the threshold can be good buying — because the market often discounts the whole category rather than the individual building, and because the big capital cost has already been incurred by previous owners.

The key is documentary evidence: the engineering sign-off, the scope of what was done, and confirmation from the council. With that in hand, these properties generally finance normally.

How we work these files

Seismic files need sequencing rather than optimism. We start with insurability, then match the property to lenders whose policy fits that specific situation, and only then put an application together. That avoids the common pattern of a buyer collecting two declines before anyone checks whether the building could be insured at all.

If you are looking in Wellington and the building has any seismic history, send it to us early. See also our Wellington home loan page for how we work in the region.

Initial versus detailed engineering assessments

Not all seismic assessments are equivalent, and the difference matters when a deal hinges on the number.

• Initial Seismic Assessment (ISA). A relatively quick, largely desk-based review using available drawings and a visual inspection. Cheaper and faster, but indicative — it produces a broad estimate rather than a precise figure.
• Detailed Seismic Assessment (DSA). A thorough engineering analysis of the specific structure, often involving intrusive investigation to confirm construction details. More expensive and slower, but far more reliable.

It is common for a DSA to produce a materially different rating from an earlier ISA, in either direction. If a building has only an ISA and the rating is what is standing between you and finance, commissioning a DSA may be worth the cost — though in a unit title building that is usually a body corporate decision rather than yours alone.

Always ask which type of assessment produced the figure you have been given, who prepared it, and when. A ten-year-old ISA is weak evidence for a lender or an insurer.

What strengthening work actually involves

If you are buying into a building with strengthening ahead of it, it helps to know what the project typically entails and why the cost varies so much. Common approaches include adding structural steel or concrete shear walls, tying floors and roofs more securely to walls, securing unreinforced masonry parapets and chimneys, and strengthening connections throughout the structure.

The cost drivers are the building's existing structure, its height, how much of it must be vacated during works, and heritage constraints. A heritage-listed façade can add substantially, because the strengthening has to be achieved without altering protected features.

For a purchaser the practical questions are: has the body corporate resolved to do the work, has it been priced, has the money been collected or borrowed, and what is the timeline. A building where all four have clear answers is a far safer purchase than one where the engineering report exists but nothing has been decided.

Insurance: what to ask and when

Because insurance is usually the binding constraint, treat it as the first step rather than the last. What to do, in order:

1. Ask the vendor or body corporate who currently insures the building and whether cover is full replacement or something less.
2. Ask whether the premium or excess has changed materially in recent renewals, and whether any insurer has declined or imposed conditions.
3. Approach a broker who deals with Wellington commercial and apartment risk — they will know which insurers are writing business in that building type.
4. Get the position in writing before you confirm your finance condition.

In a unit title building the insurance is generally arranged by the body corporate for the whole structure, so your individual position depends on a decision you do not control. That is worth understanding before you commit — if the body corporate loses cover, your mortgage is affected regardless of your own conduct.

This article explains how New Zealand lenders generally assess these situations. It is general information, not personalised financial advice, and lender policy changes often — check your own position with a registered adviser. Official sources: Reserve Bank of New Zealand for lending policy and the OCR, and Sorted.org.nz for independent government-backed money guidance.