%NBS dies in late 2026. Your lease clauses don’t.
Every Auckland commercial lease signed in the last decade contains a clause that’s about to point at nothing.
The earthquake-prone building reform working through Parliament — the Building (Earthquake-prone Buildings) Amendment Bill, introduced in December 2025 with enactment expected late 2026 — does something most market commentary has glossed. It removes Auckland from the EPB system entirely. When it does, the %NBS metric and the statutory earthquake-prone classification stop existing under the Building Act. The contracts that reference them don’t.
Auckland’s quiet exclusion
The Minister’s framing has been about cost savings. Around 2,900 buildings nationally lose their EPB status. Only 80 or so are expected to need full retrofit under the new regime. Government estimates put the saved spend at $8.2 billion. Those are the numbers that ran.
The line that didn’t run as widely: “Buildings in Auckland, Northland and the Chatham Islands will be removed from the system entirely and will not require remediation, reflecting the lower seismic risk in these regions.”
The new risk-based regime applies to concrete buildings of three storeys or more, and to unreinforced masonry buildings, in medium and high seismic hazard zones. Auckland is none of those. On enactment day, an Auckland building currently sitting on the EPB Register at 20% NBS is no longer earthquake-prone under the Building Act. No deadline. No register entry. No statutory remediation obligation.
The market response will lag the legislation. The contract response shouldn’t.
Orphaned, not void
%NBS and the EPB classification are statutory constructs. The leases, agreements to lease, and sale and purchase agreements that reference them are private contracts. Repealing the statute doesn’t void the contract. It removes the reference point.
A landlord warranty that “the Building is no less than 67% NBS” still binds. The number it points to still exists as an engineering output. What changed is that the legislative framework giving it a standard methodology and a public register has gone. Same building, two different engineers, two different numbers. That variance existed under the old regime. It gets worse without it.
A clause that triggers abatement “if the Building is classified as earthquake-prone” still binds — but the classification it depends on can no longer occur in Auckland. The trigger becomes mechanically impossible to pull. Unworkable clauses get fought over.
Five clause types worth auditing
Read every active commercial lease, ATL and SPA on your stack against these:
1. Landlord seismic warranties. Stated %NBS at handover, sometimes with an obligation to maintain. The warranty binds but loses its public assessment framework.
2. Tenant break rights tied to EPB status. Common in leases written between 2017 and 2022. In Auckland these go dormant. Retire them or re-anchor them.
3. Rent abatement triggers. Abatement if the building is closed, vacated or remediated under the EPB regime. In Auckland the triggering event becomes legally impossible — which is not the same as the underlying risk being gone.
4. Remediation cost allocation and OPEX recovery. Existing leases often allocate EPB strengthening costs between landlord and tenant. The work itself may still occur, driven by lender, insurer or HSWA pressure, but the legal label has changed.
5. Make-good and reinstatement standards. Anything that references %NBS as a return-condition benchmark. Quiet, but it bites at lease end.
Most documents need a clarifying side letter or variation, not a fresh draft. The work is identifying which documents need which.
The view that nothing really changes
There’s a reasonable read that goes the other way. Banks still use %NBS as a private credit metric and will keep doing so after enactment. Insurers still underwrite seismic risk on their own terms. The Health and Safety at Work Act 2015 sits beside the Building Act, not under it, and a PCBU still owes a duty to manage seismic risk regardless of what the Building Act says. So %NBS doesn’t really disappear — it loses statutory force and continues life as a private benchmark. On that view, the contract orphaning is a paper problem the parties will quietly fix by treating %NBS as a continued private reference.
Most of that is right. None of it solves the orphaning.
The statutory regime gave %NBS three things: a standard assessment methodology, a public register, and a shared interpretation of what counted as quake-prone. All three disappear. What persists is the number an engineer writes on a report, without the framework that made two engineers likely to write the same number. The variance was always going to bite. The question is which party’s drafting picks up the slack, and the answer is whoever moves first.
Vary now, value later
Two practical sequencing calls.
First, run the contract clean-up before enactment, not after. Variations agreed under the current regime are easier to negotiate — both sides can see where the regime is headed. After enactment, the drafting gets fought against a missing reference point and a counterparty with leverage they didn’t have last year.
Second, hold off running a fresh valuation case until enactment is closer to certain. The bill still has to clear Select Committee, second reading, committee of the whole and Royal Assent. Treating late-2026 reform as priced today is premature. Treating it as priced never is the other mistake.
The owners who repaper before late 2026 set the precedent for what a post-EPB Auckland lease looks like. The owners who wait inherit someone else’s drafting.
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*Commentary on a proposed bill currently before Select Committee. Not legal advice. Specific contract clauses should be reviewed with your lawyer.*